WLC tuning datarates

hi all,
I need some guidance on tuning the data rates of the 802.11a and b bands.
The setup we have is a 5508 with 1142/1600/2600 APs. It is a general office environment, clients are corporate and guest notebooks, phones and tablets.
At the moment the supported and mandatory data rates are on their default values.
I don't want to support legacy .11a and .11b (Its 2014 right)
I want only to allow g and bn on the 2.4GHz band and an on the 5GHz band.
What settings should I use (what is mandatory and what supported?)
What are the settings you use in your environment?
I notice in my Windows task manager, that when I move out of the coverage area my data rate drops to some low levels, the further I move away.
Is this something to keep in mind when disabling datarates in areas with not so good coverage?
And how can I see the datarate my clients are connected to on the WLC? (this does not seem to be in the clients details)

Check how your wireless AP deployment and wireless signal saturation is. If it's that good, then it is a good practice to disable data rates from 1 Mbps to 11 Mbps. Make 18 Mbps as Mandatory and the rest is Supported.
There's a downside to this. Disabling the low-speed data rates means you've also minimized the coverage radius per AP. While this is good, you need to ensure your wireless NICs are running the latest drivers. Default drivers and drivers downloaded from the wireless clients' website are woefully out-of-date.

Similar Messages

Wlc 4402 fine tuning

Hello,
In one of our building we have a wlc 4402 controller with 50 1130 APs.
This setup is mainly used for VOIP Wireless with a 7921 phone.
I need advices on how i can fine tune the APs to obtain the very maximum
coverage for the 7921 phone.
thanks

there is no tweaks i can do to obtain better coverage ?
i can do some trade-off on wifi signal since the setup is used only for the one 7921 telephone.
thanks again

Client Roaming Within Single WLC with Different AP Groups

I am trying to setup a 4400 WLC with 2 different AP Groups mapped to its respective Dynamic Interfaces / Vlans. AP's are equally mapped to both the AP groups by Floor wise ex: First floor AP's connect to one AP group and the Second Floor AP's connecting to other AP group.
Goal is to create separate Network policy for each Floor using ACL's and apply to their respective Vlans on Layer 3 Switch. Wireless Raoming should happen seamlessly between these Ap groups making the DHCP changes by not disconnecting and connecting every time user roam across the Floors.
Problem is When Clients Roam between Floors i,e moving between AP Groups, they still maintain their old DHCP IP addresses when moved to new AP group even after Client re-authetication. This defies our goal of creating a Wireless Network Policy using single WLC.
Knobs i have tuned in WLC to acheive our goal includes....
1. WLAN Session Timeout - No use
2. DHCP Proxy Disable - No Use
3. ARP Time out - No use
Looks like WLC is storing the IP address and MAC information of the Client unconditonally during roaming and clearing out untill a manual or forced disconnect or disassociation is done.
Did anyone tried to implement this setup and made it running? Any help or suggestion would be higly appreciated.
Thanks
Guru

abit late for a reply but....try going to the SSID>Advanced and ticking the "DHCP Addr. Assignment" Required checkbox and test again.
What does the DHCP Required field under a WLAN signify?
A. DHCP Required is an option that can be enabled for a WLAN. It necessitates that all clients that associate to that particular WLAN obtain IP addresses through DHCP. Clients with static IP addresses are not allowed to associate to the WLAN. This option is found under the Advanced tab of a WLAN. WLC allows the traffic to/from a client only if its IP address is present in the MSCB table of the WLC. WLC records the IP address of a client during its DHCP Request or DHCP Renew. This requires that a client renews its IP address every time it re-associates to the WLC because every time the client disassociates as a part of its roam process or session timeout, its entry is erased from the MSCB table. The client must again re-authenticate and reassociate to the WLC, which again makes the client entry in the table.

Client drops - Tuning EAP timers?

I have had some clients complaining (laptop users) about being dropped from the WiFi and this appears to correlate with the events in the WLC log for DOT1X-4-MAX_EAPOL_KEY_RETRANS for those clients.
Drops are more frequent when the network and neighbours networks are under load during the day.
What would your advice be on tuning this? I based my settings off a guide found here:
https://supportforums.cisco.com/document/46101/eap-timers-wireless-lan-controllers
The way I interpret this is that the settings present a bit of a tradeoff between the risk of being dropped and the time it takes to get back in if you are dropped.
We have a WLC 2500 with 2700 APs running 7.6.130.0.
Below are the current settings that we have set:
Edit: Table did not paste correctly
Local Auth Active Timeout1 (in secs) "300"
Identity Request Timeout (in secs) "5"
Identity request Max Retries "12"
Dynamic WEP Key Index "0"
Request Timeout (in secs) "30"
Request Max Retries "2"
Max-Login Ignore Identity Response "enable"
APOL-Key Timeout (in milliSeconds) "1000"
EAPOL-Key Max Retries "2"
EAP-Broadcast Key Interval(in secs) "3600"
Local Auth Active Timeout1 (in secs)
Identity Request Timeout (in secs)
Identity request Max Retries
Dynamic WEP Key Index
Request Timeout (in secs)
Request Max Retries
Max-Login Ignore Identity Response
disable enable
EAPOL-Key Timeout (in milliSeconds)
EAPOL-Key Max Retries
EAP-Broadcast Key Interval(in secs)

I should have mentioned that this is on WPA2 also.
What I'm told is that the drops may occur 2-3 times per day by some users. Other's don't have this issue or aren't bothered enough by it to notice. There is no definite correlation between equipment or area although proximity to APs does influence this (drops are more likely with increased distance) but we still have users without such drops at the same location as users experiencing them. Drops only seem to occur during busy office hours and not outside of them despite this being a 24/7 access office with a considerable amount of people staying late.
I could probably attempt a cli client debug capture and see if something else shows up although the problem is not very frequent so it will be a long day.
Another question would be what is withing the tolerances of how WiFi should perform in this situation. Is it reasonable for this to happen in a WiFi congested spot.
Entries for an affected client in wlc-syslog set to debug (not the cli debug tool) may look like this during a day for the mac aa:bb:cc:aa:bb:cc:
Cisco_ac: 3c:44: *dot1xMsgTask: Mar 13 11:57:34.645: #DOT1X-4-MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:508 Max EAPOL-key M1 retransmissions exceeded for client aa:bb:cc:aa:bb:cc
Cisco_ac: 3c:44: *dot1xMsgTask: Mar 13 11:57:41.045: #DOT1X-4-MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:508 Max EAPOL-key M1 retransmissions exceeded for client aa:bb:cc:aa:bb:cc
Cisco_ac: 3c:44: *dot1xMsgTask: Mar 13 11:57:47.045: #DOT1X-4-MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:508 Max EAPOL-key M1 retransmissions exceeded for client aa:bb:cc:aa:bb:cc
Cisco_ac: 3c:44: *dot1xMsgTask: Mar 13 11:58:25.265: #DOT1X-4-MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:508 Max EAPOL-key M1 retransmissions exceeded for client aa:bb:cc:aa:bb:cc
Cisco_ac: 3c:44: *dot1xMsgTask: Mar 13 11:58:32.065: #DOT1X-4-MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:508 Max EAPOL-key M1 retransmissions exceeded for client aa:bb:cc:aa:bb:cc
Cisco_ac: 3c:44: *dot1xMsgTask: Mar 13 11:58:38.065: #DOT1X-4-MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:508 Max EAPOL-key M1 retransmissions exceeded for client aa:bb:cc:aa:bb:cc

WLC Data Rates behaviour

Hello everyone!
I have some questions about the data rates configuration in WLC. I've been reading Cisco documentation and this forum, but as I've seen some contradictory information I would like you to clarify me some points.
I want to disable 802.11b clients, so for that I'm going to disable 1, 2, 5.5 and 11Mbps data rates (other option could be set these as supported only). Then, I have to assign at least one of the other data rates as mandatory...
I could think in one of these three options
Option 1: all 802.11g data rates as mandatory. In this case, as far as I understand:
Broadcast are sent to the lowest data rate
Multicast are sent to the highest data rate (but if a client is connected to other data rate than the highest, then multicast frames are sent to this data rate supported by the client, is that right??). Basically, you cannot be sure at which data rate multicast frames are sent as it can change depending on the clients.
Clients can connect as soon as they support one of the mandatory data rate
Option 2: one 802.11g data rate as mandatory. This would define better the cell limits.
Broadcast and multicast are sent at the same data rate
Clients can connect if they support the mandatory data rate
Option 3: set two data rates as mandatory (or the OFDM required data rates: 6,12, 24Mbps), and the others as supported
Broadcast are sent at the lowest data rate
Multicast are sent at the highest data rate (shifting back to the lowest if a customer cannot connect to this data rate)
Clients can connect if they support at least one of the mandatory data rates.
Am I right with this assumptions? I have read some other different behaviors, like broadcast and multicast are sent at the same common data rate...
I hope I have explained myself...
Thank you very much for your support.
Carolina

Hello,
thank you Scott and George!
I read the post, and it is ok, and I finally have found some information in Cisco's website:
http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/b_cg74_CONSOLIDATED_chapter_01011.html#ID2482
"Access points running recent Cisco IOS versions transmit multicast frames at the highest configured basic rate and management frames at the lowest basic mandatory rates, can cause reliability problems. Access points running LWAPP or autonomous Cisco IOS should transmit multicast and management frames at the lowest configured basic rate. Such behavior is necessary to provide good coverage at the cell's edge, especially for unacknowledged multicast transmissions where multicast wireless transmissions might fail to be received. Because multicast frames are not retransmitted at the MAC layer, clients at the edge of the cell might fail to receive them successfully. If reliable reception is a goal, multicast frames should be transmitted at a low data rate. If support for high data rate multicast frames is required, it might be useful to shrink the cell size and disable all lower data rates.
Depending on your requirements, you can take the following actions:
If you need to transmit multicast data with the greatest reliability and if there is no need for great multicast bandwidth, then configure a single basic rate, that is low enough to reach the edges of the wireless cells.
If you need to transmit multicast data at a certain data rate in order to achieve a certain throughput, you can configure that rate as the highest basic rate. You can also set a lower basic rate for coverage of nonmulticast clients."
Based on your experience, does it have any sense to have configured all datarates as mandatory? This is the current configuration I have in our controllers but it wasn't done by me.
Thanks.
Carolina

Backplane and throghput in wlc 4402

hi,
what is the back plane and through put of wlc 4402 ,is there any backplane and throughput 1131 series wireless device,
2. what is difference between data rate and bandwidth, i mean 54mbps signifies in wireless datarate or its bandwidth per ap 1131

Hi,
The throughput of the 4402 is up to 2Gbps if its ports are bundled in a etherchannel.
For access points, data rate is the speed at which the data frame is transmitted. to evaluate throughput you must add the fact that the medium is half-duplex, that there is signaling overhead and that there are moments of silence.
Overall, the throughput for a 11g access points (1130,1240) is 19Mbps. This is what you test in real life with iperf.
Regards,
Nicolas

WLC 4400 and IDS/IPS

One of my clients is keen to know the IDS/IPS capabilities with WLC 4400. Any hints? Also can anyone explain IDS sensor to me? Thank you.

There are a number of IDS capabilities that are highlighted regarding the WLC. Unfortunately, you will find that the product continues to suffer from ongoing false positives and a severe lack of documentation (and support) for the IDS.
For example, if you utilize containment against a rogue AP (which is used to prevent users from attaching to the rogue), the system detects its own containment messages as a denial of service attack. The system is not intelligent enough to know that it is the source of these messages and ignore them.
Initially, Cisco flagged these false positive as "cosmetic" and claimed that to fix them required a "feature request that must be run through the Cisco sales team" which we did in the spring of 07. Cisco has be VERY slow in coming around on getting these fixed (it has been well over a year since these have been documented and they are still not resolved in the current version of 4.2).
The Wireless IDS system is also famous for other false alarms which Cisco TAC has linked to alarming on normal behavior when a client goes out of range and a string of deauthentication messages is sent to make sure that the conversation has ended. The WLC 4.2 continues to flag these as false-positive denial-of-service attacks even though the IDS parameters could be adjusted (from the factory) to account for the known 64 repeated deauths that are sent.
The IDS file is capable of "tuning" but the parameters are very lightly documented. In fact, the IDS parameter file itself had the least sparse version of documentation and it is a text file only 200-lines long.
In terms of determining if a rogue AP is on-wire. This functionality does not work reliably (not just if there is no path on the wired network to the controller which is understandable) but even if the rogue AP is on the same subnet as the controller. It just plain does not work.
If you are attempting to determine if there are clients on the rogue AP, this mechanism works with limited success since the AP has to catch the client attaching during its brief scan interval. This results in misleading information.
There are other false alarms that appear to be related to a specific chipset (using the OUI / first octet of the MAC address). However, there has been very little movement on Cisco's part in getting resolution to getting these anomalies addressed. The basic attitude has been "if we didn't see it in our lab in San Jose when we wrote the code, there's nothing we can do". Since the IDS lacks any ability to "phone home" (sending the alarms it is seeing to the development team) they end up having to develop in a relatively limited environment.
For more information, please reference the following:
Wireless LAN Controller IDS Signature Parameters
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a008063e5d0.shtml
I would send you the link to some of the bugs, such as CSCsj06015, CSCsh35010, CSCsk60655, etc. but the Cisco bug tool ( http://tools.cisco.com/Support/BugToolKit/ )is currently not working (no doubt the system is getting overworked). Maybe the site will be up when you read this.
In the interest of fairness, there have been efforts over the past year by Cisco to address these false alarms and a number of them appear to finally be resolved.
Bottom line: In my opinion, the wireless IDS is still not ready for prime time. To quote my customer, "I just can't trust it". Unless you set your customer's expectations fairly low, you will both end up disappointed.
That said, the product itself still has many compelling reasons to implement it including ease of installation and management. If you are willing to wade through the various bugs in the IDS and WCS it still is the best game in town.
- John

Optimized Roaming, CHDM, RSSI Low Check tuning makes no effect on roaming !!!

Hi Experts,
I'm facing sticky issue. Such as, I have 4 APs sit inline A > B > C > D. Each spaces 13 meters apart. We're running WLC8.0.110 and 500 of AP1700. We put close AP for doing wifi location service with MSE/CMX.
Now, location is not being updated in timely manner. I noticed, If client gets roamed, Location info will coming along with that roaming. So that's why I'm focusing on sticky issue. We found that traditional client serving internet gets sticky when then walking along and serving their internet. RSSI gets too low before being roamed. SLA was affected.
I have tried to tune for Optimized Roaming, CHDM, RSSI Low Check tuning for this mall (Department store).
From various good documents (such http://www.mikealbano.com/2014/08/optimized-roaming-rssi-low-check-rx-sop.html)
My actions:
- I designed to disable RSSI Low Check. Because I will using Optimised Roaming.
- 802.11a/802.11b Client Roaming > RF parameters > I tried to let HIGHER Minimum RSSI (default = -85dbm). I putted around -72 and hope client easier to associate to a new AP and be roamed.
- I also let HIGHER Scan Threshold (default = -72dbm). I putted around -68, hope WLC put more probe to client when RSSI lower than -68. This may help faster roaming occur.
- I enabled Optimized Roaming. By setting LOWEST Optimized Roaming Interval = 5 sec. Hope WLC gives disassociation frame to client whenever client reach RSSI = Coverage Threshold > Data RSSI (I set to = -68)
AP1700 doesn't support RX SOP.
However, all above does make no affect on roaming improvement at all. Client still DOESN'T get roamed when they reach Data RSSI(-68) but still be roamed at -72 as DEFAULT WLC SETTING.
Does Optimized Roaming, CHDM, RSSI Low Check truly control client roaming? Or anything I did wrong?
Any experiences are welcome. Could any share me effective setup? Thank you in advance.
Nipat CCIE#29422

Hi, thank you for the helpful guidance. I have a basic question, if the device roam from one AP to another AP with the same SSID. Is there a need of re-authentication given a) the network uses EAP based authentication; b) the network uses MAC address authentication. If there is no need of EAP re-authentication, how the 802.11 keys are moved to the new AP. Thank you very much if you could help me clarify my thought.

Web Authentication on HTTP Instead of HTTPS in WLC 5700 and WS-C3650-48PD (IOS XE)

Hello,
I have configured a Guest SSID with web authentication (captive portal).
wlan XXXXXXX 2 Guest
aaa-override
client vlan YYYYYYYYY
no exclusionlist
ip access-group ACL-Usuarios-WIFI
ip flow monitor wireless-avc-basic input
ip flow monitor wireless-avc-basic output
mobility anchor 10.181.8.219
no security wpa
no security wpa akm dot1x
no security wpa wpa2
no security wpa wpa2 ciphers aes
security web-auth
security web-auth parameter-map global
session-timeout 65535
no shutdown
The configuration of webauth parameter map is :
service-template webauth-global-inactive
inactivity-timer 3600
service-template DEFAULT_CRITICAL_VOICE_TEMPLATE
voice vlan
parameter-map type webauth global
type webauth
virtual-ip ipv4 1.1.1.1
redirect on-success http://www.google.es
I need to login on web authentication on HTTP instead of HTTPS.
If I login on HTTP, I will not receive certificate alerts that prevent the users connections.
I saw how to configure it with 7.x relesae but I have IOS XE Version 03.03.05SE and I don´t know how to configure it.
Web Authentication on HTTP Instead of HTTPS
You can login on web authentication on HTTP instead of HTTPS. If you login on HTTP, you do not receive certificate alerts.
For earlier than WLC Release 7.2 code, you must disable HTTPS management of the WLC and leave HTTP management. However, this only allows the web management of the WLC over HTTP.
For WLC Release 7.2 code, use the config network web-auth secureweb disable command to disable. This only disables HTTPS for the web authentication and not the management. Note that this requires a reboot of the controller !
On WLC Release 7.3 and later code, you can enable/disable HTTPS for WebAuth only via GUI and CLI.
Can anyone tell me how to configure web authentication on HTTP instead of HTTPS with IOS XE?
Thanks in advance.
Regards.

The documentation doesn't provide very clear direction, does it?
To download the WLC's default webauth page, browse to the controller's Security > Web Login Page. Make sure the web authentication type is Internal (Default). Hit the Preview button. Then use your browser's File > Save As... menu item to save the HTML into a file. Edit this to your liking and bundle it and any graphics images up into a TAR archive, then upload via the controller's COMMAND page.

ISE 1.2 - WLC 5508 (7.5x) - Windows 7 802.1X

Hi ,
We deployed ISE 1.2 (patch 3) with 5580 WLC to authenticate machines and users using 802.1x .
We are experiencing a strange issue - randomly some machines authenticate fine over wireless and we are able to see logs on ISE and nexst day the same machine stops authenticating itself and ISE doesnt generate any log.. seems like somehow no request is coming to ISE.
we have checked all the settings including wireless settings ,services, 802.1x settings on the laptop but struggling to find the a reason why randomly machine would work and then not work.
whenever a machine works we see all the logs but when a machine doesnt work no log is generated in ise.
has anyone experienced a similar issue?
Thanks

Thanks, we have figured it out.
Machine Auth timer would expire after 12 hours and ISE had another setting where it would blacklist the client and supress logs for an hour if it sees more then certain amount of failed authentication attempts.
Thanks

ISE 1.2 and WLC 7.4 Stability

We are deploying ISE 1.2 for wireless only and have been experiencing a lot of issues with central web auth on controllers on version 7.4MR2. It appears we are hitting a bug, but I am curious what others on ISE 1.2 have found as the best stable WLC code to use? Has anyone been experiencing issues on 7.4 specific to CWA and web redirect? We are encountering a problem where users are getting constantly thrown back to the guest portal page after about 5 to 10 minutes after successfully logging in. Thanks.

Hi,
I have been running 7.4.115.0 on a production system for over 6 months with no visible issues. The 7.4.115.0 patch is a special release to fix Apple iOS7 captive portal bypass. Other than that, 7.4.110.0 was pretty stable.
You might consider changing the Guest WLAN session timeout on the advanced page on the WLAN in the WLC to a higher number which may fix your re-authentication issue every 5-10 minutes.

Help for query tuning

hello all
my one of query is returning result in 1-2 mins only for 1 lakh record but i am not sure if it showed me complete rows or not because when I an trying to get count of result ..its taking lot of time .when I am using this query on plsql code ..code is running slow so just wanted to confirm on query tuning point of view if its fine or not ..please look onto it and let me know if query is fine or not by explain plan .my oracle version is 11g
this is my query
SELECT ROWNUM , TRUNC(rownum/5000) + 20000 ,'FOR_UPDATE', sku_org.NAME ,
acct_promo_sku.src_num , acct_promo_sku.sub_type ,
promo_actual.sku_actual_pos
FROM siebel.s_src acct_promo_hdr,
siebel.s_src acct_title_format,
siebel.s_src acct_promo_sku,
siebel.s_src_x acct_promo_hdrx,
siebel.s_src_x acct_promo_skux,
siebel.s_prod_int prod,
siebel.s_bu promo_hdr_org,
siebel.s_bu sku_org,
siebelwb.stg_sbl_acct_promo_actuals2 promo_actual
WHERE acct_promo_hdr.sub_type = 'PLAN_ACCOUNT_PROMOTION'
AND acct_promo_hdr.row_id = acct_title_format.par_src_id
AND acct_title_format.sub_type = 'PLAN_ACCT_PROMOTION_CATEGORY'
AND acct_title_format.row_id = acct_promo_sku.par_src_id
AND acct_promo_sku.sub_type = 'PLAN_ACCOUNT_PROMOTION_PRODUCT'
AND acct_promo_hdr.row_id = acct_promo_hdrx.par_row_id
AND acct_promo_sku.row_id = acct_promo_skux.par_row_id(+)
AND acct_promo_sku.prod_id = prod.row_id
AND acct_promo_hdr.bu_id = promo_hdr_org.row_id
AND acct_promo_sku.bu_id = sku_org.row_id
AND prod.x_prod_material_num = promo_actual.material_number
and prod.X_PROD_SALES_ORG=promo_actual.sales_org
AND acct_promo_hdr.row_id = promo_actual.acct_promo_id
and nvl(acct_promo_hdr.pr_accnt_id,0)=nvl(promo_actual.acct_siebel_rowid,0)
and nvl(acct_promo_hdr.x_indirect_id,0)=nvl(promo_actual.indirect_acct_siebel_rowid,0)
AND promo_actual.load_date >= TRUNC(SYSDATE)
AND promo_actual.load_date < TRUNC(SYSDATE + 1)
explain plan
PLAN_TABLE_OUTPUT
Plan hash value: 3864590768
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 298 | 2300 (1)| 00:00:28 |
| 1 | COUNT | | | | | |
|* 2 | FILTER | | | | | |
| 3 | NESTED LOOPS | | | | | |
| 4 | NESTED LOOPS | | 1 | 298 | 2300 (1)| 00:00:28 |
| 5 | NESTED LOOPS OUTER | | 1 | 273 | 2298 (1)| 00:00:28 |
| 6 | NESTED LOOPS | | 1 | 263 | 2296 (1)| 00:00:28 |
| 7 | NESTED LOOPS | | 1 | 236 | 2295 (1)| 00:00:28 |
| 8 | NESTED LOOPS | | 1 | 165 | 2292 (1)| 00:00:28 |
| 9 | NESTED LOOPS | | 1 | 117 | 2289 (1)| 00:00:28 |
| 10 | NESTED LOOPS | | 1 | 109 | 2289 (1)| 00:00:28 |
| 11 | NESTED LOOPS | | 1 | 99 | 2287 (1)| 00:00:28 |
|* 12 | TABLE ACCESS FULL | STG_SBL_ACCT_PROMO_ACTUALS2 | 1 | 49 | 2285 (1)| 00:0
|* 13 | TABLE ACCESS BY INDEX ROWID| S_SRC | 1 | 50 | 2 (0)| 00:00:01 |
|* 14 | INDEX UNIQUE SCAN | S_SRC_P1 | 1 | | 1 (0)| 00:00:01 |
|* 15 | INDEX RANGE SCAN | S_SRC_X_U1 | 1 | 10 | 2 (0)| 00:00:01 |
|* 16 | INDEX UNIQUE SCAN | S_BU_P1 | 1 | 8 | 0 (0)| 00:00:01 |
|* 17 | TABLE ACCESS BY INDEX ROWID | S_SRC | 1 | 48 | 3 (0)| 00:00:01 |
|* 18 | INDEX RANGE SCAN | S_SRC_F2 | 2 | | 2 (0)| 00:00:01 |
|* 19 | TABLE ACCESS BY INDEX ROWID | S_SRC | 1 | 71 | 3 (0)| 00:00:01 |
|* 20 | INDEX RANGE SCAN | S_SRC_F2 | 2 | | 2 (0)| 00:00:01 |
| 21 | TABLE ACCESS BY INDEX ROWID | S_BU | 1 | 27 | 1 (0)| 00:00:01 |
|* 22 | INDEX UNIQUE SCAN | S_BU_P1 | 1 | | 0 (0)| 00:00:01 |
|* 23 | INDEX RANGE SCAN | S_SRC_X_U1 | 1 | 10 | 2 (0)| 00:00:01 |
|* 24 | INDEX UNIQUE SCAN | S_PROD_INT_P1 | 1 | | 1 (0)| 00:00:01 |
|* 25 | TABLE ACCESS BY INDEX ROWID | S_PROD_INT | 1 | 25 | 2 (0)| 00:00:
Predicate Information (identified by operation id):
2 - filter(TRUNC(SYSDATE@!)<TRUNC(SYSDATE@!+1))
12 - filter("PROMO_ACTUAL"."LOAD_DATE">=TRUNC(SYSDATE@!) AND "PROMO_ACTUAL"."LOAD_DATE"<TRUNC(SYSD
13 - filter("ACCT_PROMO_HDR"."SUB_TYPE"='PLAN_ACCOUNT_PROMOTION' AND
NVL("ACCT_PROMO_HDR"."PR_ACCNT_ID",'0')=NVL("PROMO_ACTUAL"."ACCT_SIEBEL_ROWID",'0') AND
NVL("ACCT_PROMO_HDR"."X_INDIRECT_ID",'0')=NVL("PROMO_ACTUAL"."INDIRECT_ACCT_SIEBEL_ROWID",'0'
14 - access("ACCT_PROMO_HDR"."ROW_ID"="PROMO_ACTUAL"."ACCT_PROMO_ID")
15 - access("ACCT_PROMO_HDR"."ROW_ID"="ACCT_PROMO_HDRX"."PAR_ROW_ID")
16 - access("ACCT_PROMO_HDR"."BU_ID"="PROMO_HDR_ORG"."ROW_ID")
17 - filter("ACCT_TITLE_FORMAT"."SUB_TYPE"='PLAN_ACCT_PROMOTION_CATEGORY')
18 - access("ACCT_PROMO_HDR"."ROW_ID"="ACCT_TITLE_FORMAT"."PAR_SRC_ID")
19 - filter("ACCT_PROMO_SKU"."PROD_ID" IS NOT NULL AND
"ACCT_PROMO_SKU"."SUB_TYPE"='PLAN_ACCOUNT_PROMOTION_PRODUCT')
20 - access("ACCT_TITLE_FORMAT"."ROW_ID"="ACCT_PROMO_SKU"."PAR_SRC_ID")
22 - access("ACCT_PROMO_SKU"."BU_ID"="SKU_ORG"."ROW_ID")
23 - access("ACCT_PROMO_SKU"."ROW_ID"="ACCT_PROMO_SKUX"."PAR_ROW_ID"(+))
24 - access("ACCT_PROMO_SKU"."PROD_ID"="PROD"."ROW_ID")
25 - filter("PROD"."X_PROD_MATERIAL_NUM" IS NOT NULL AND
"PROD"."X_PROD_MATERIAL_NUM"="PROMO_ACTUAL"."MATERIAL_NUMBER" AND
"PROD"."X_PROD_SALES_ORG"="PROMO_ACTUAL"."SALES_ORG")
55 rows selected.
thanks

Hi,
the plan you posted has the cost of 2300, i.e. 2300 single-block reads or equivalent number f multi-block reads. Even if none of the blocks is found in cache, 2300 reas shouldn't take more than a couple of minutes, beacause for most of the hard drives available today a disk read is typically within 5-10 ms.
This means that if there is a problem, we will never find out about it by looking in the plan. And it's quite likely that there is, in fact, a problem, because the plan contains a bunch of nested joins, and the cost of each nested join is directly proportional to the cardinality of the previous nested loop. I.e. it suffices to make one bad mistake in estimating the number of rows coming fom one of the nested rows to screw up the entire plan and get all remaining estimates (including the total cost of the query) completely wrong.
In order for us to be able to tell more, we need to see the plan with rowsource statistics, and please don't forget to use tags to preserve formatting (use the preview tab to make sure the posted plan is actually readable).
Best regards,
Nikolay

HOW TO: Post a SQL statement tuning request - template posting

This post is not a question, but similar to Rob van Wijk's "When your query takes too long ..." post should help to improve the quality of the requests for SQL statement tuning here on OTN.
On the OTN forum very often tuning requests about single SQL statements are posted, but the information provided is rather limited, and therefore it's not that simple to provide a meaningful advice. Instead of writing the same requests for additional information over and over again I thought I put together a post that describes how a "useful" post for such a request should look like and what information it should cover.
I've also prepared very detailed step-by-step instructions how to obtain that information on my blog, which can be used to easily gather the required information. It also covers again the details how to post the information properly here, in particular how to use the \ tag to preserve formatting and get a fixed font output:
http://oracle-randolf.blogspot.com/2009/02/basic-sql-statement-performance.html
So again: This post here describes how a "useful" post should look like and what information it ideally covers. The blog post explains in detail how to obtain that information.
In the future, rather than requesting the same additional information and explaining how to obtain it, I'll simply refer to this HOW TO post and the corresponding blog post which describes in detail how to get that information.
*Very important:*
Use the \ tag to enclose any output that should have its formatting preserved as shown below.
So if you want to use fixed font formatting that preserves the spaces etc., do the following:
\   This preserves formatting
\And it will look like this:
   This preserves formatting
   . . .Your post should cover the following information:
1. The SQL and a short description of its purpose
2. The version of your database with 4-digits (e.g. 10.2.0.4)
3. Optimizer related parameters
4. The TIMING and AUTOTRACE output
5. The EXPLAIN PLAN output
6. The TKPROF output snippet that corresponds to your statement
7. If you're on 10g or later, the DBMS_XPLAN.DISPLAY_CURSOR output
The above mentioned blog post describes in detail how to obtain that information.
Your post should have a meaningful subject, e.g. "SQL statement tuning request", and the message body should look similar to the following:
*-- Start of template body --*
The following SQL statement has been identified to perform poorly. It currently takes up to 10 seconds to execute, but it's supposed to take a second at most.
This is the statement:
select
from
         t_demo
where
         type = 'VIEW'
order by
         id;It should return data from a table in a specific order.
The version of the database is 11.1.0.7.
These are the parameters relevant to the optimizer:
SQL>
SQL> show parameter optimizer
NAME                                 TYPE        VALUE
optimizer_capture_sql_plan_baselines boolean     FALSE
optimizer_dynamic_sampling           integer     2
optimizer_features_enable            string      11.1.0.7
optimizer_index_caching              integer     0
optimizer_index_cost_adj             integer     100
optimizer_mode                       string      ALL_ROWS
optimizer_secure_view_merging        boolean     TRUE
optimizer_use_invisible_indexes      boolean     FALSE
optimizer_use_pending_statistics     boolean     FALSE
optimizer_use_sql_plan_baselines     boolean     TRUE
SQL>
SQL> show parameter db_file_multi
NAME                                 TYPE        VALUE
db_file_multiblock_read_count        integer     8
SQL>
SQL> show parameter db_block_size
NAME                                 TYPE        VALUE
db_block_size                        integer     8192
SQL>
SQL> show parameter cursor_sharing
NAME                                 TYPE        VALUE
cursor_sharing                       string      EXACT
SQL>
SQL> column sname format a20
SQL> column pname format a20
SQL> column pval2 format a20
SQL>
SQL> select
2            sname
3          , pname
4          , pval1
5          , pval2
6 from
7          sys.aux_stats$;
SNAME                PNAME                     PVAL1 PVAL2
SYSSTATS_INFO        STATUS                          COMPLETED
SYSSTATS_INFO        DSTART                          01-30-2009 16:25
SYSSTATS_INFO        DSTOP                           01-30-2009 16:25
SYSSTATS_INFO        FLAGS                         0
SYSSTATS_MAIN        CPUSPEEDNW              494,397
SYSSTATS_MAIN        IOSEEKTIM                    10
SYSSTATS_MAIN        IOTFRSPEED                 4096
SYSSTATS_MAIN        SREADTIM
SYSSTATS_MAIN        MREADTIM
SYSSTATS_MAIN        CPUSPEED
SYSSTATS_MAIN        MBRC
SYSSTATS_MAIN        MAXTHR
SYSSTATS_MAIN        SLAVETHR
13 rows selected.Here is the output of EXPLAIN PLAN:
SQL> explain plan for
2 -- put your statement here
3 select
4            *
5 from
6            t_demo
7 where
8            type = 'VIEW'
9 order by
10            id;
Explained.
Elapsed: 00:00:00.01
SQL>
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 1390505571
| Id | Operation                   | Name     | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT            |          |     1 |    60 |     0   (0)| 00:00:01 |
|   1 | TABLE ACCESS BY INDEX ROWID| T_DEMO   |     1 |    60 |     0   (0)| 00:00:01 |
|* 2 |   INDEX RANGE SCAN          | IDX_DEMO |     1 |       |     0   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - access("TYPE"='VIEW')
14 rows selected.Here is the output of SQL*Plus AUTOTRACE including the TIMING information:
SQL> rem Set the ARRAYSIZE according to your application
SQL> set autotrace traceonly arraysize 100
SQL> select
2            *
3 from
4            t_demo
5 where
6            type = 'VIEW'
7 order by
8            id;
149938 rows selected.
Elapsed: 00:00:02.21
Execution Plan
Plan hash value: 1390505571
| Id | Operation                   | Name     | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT            |          |     1 |    60 |     0   (0)| 00:00:01 |
|   1 | TABLE ACCESS BY INDEX ROWID| T_DEMO   |     1 |    60 |     0   (0)| 00:00:01 |
|* 2 |   INDEX RANGE SCAN          | IDX_DEMO |     1 |       |     0   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - access("TYPE"='VIEW')
Statistics
          0 recursive calls
          0 db block gets
     149101 consistent gets
        800 physical reads
        196 redo size
    1077830 bytes sent via SQL*Net to client
      16905 bytes received via SQL*Net from client
       1501 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
     149938 rows processed
SQL>
SQL> disconnect
Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing optionsThe TKPROF output for this statement looks like the following:
TKPROF: Release 11.1.0.7.0 - Production on Mo Feb 23 10:23:08 2009
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Trace file: orcl11_ora_3376_mytrace1.trc
Sort options: default
count    = number of times OCI procedure was executed
cpu      = cpu time in seconds executing
elapsed = elapsed time in seconds executing
disk     = number of physical reads of buffers from disk
query    = number of buffers gotten for consistent read
current = number of buffers gotten in current mode (usually for update)
rows     = number of rows processed by the fetch or execute call
select
from
         t_demo
where
         type = 'VIEW'
order by
         id
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.00       0.00          0          0          0           0
Execute      1      0.00       0.00          0          0          0           0
Fetch     1501      0.53       1.36        800     149101          0      149938
total     1503      0.53       1.36        800     149101          0      149938
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 88
Rows     Row Source Operation
149938 TABLE ACCESS BY INDEX ROWID T_DEMO (cr=149101 pr=800 pw=0 time=60042 us cost=0 size=60 card=1)
149938   INDEX RANGE SCAN IDX_DEMO (cr=1881 pr=1 pw=0 time=0 us cost=0 size=0 card=1)(object id 74895)
Elapsed times include waiting on following events:
Event waited on                             Times   Max. Wait Total Waited
----------------------------------------   Waited ---------- ------------
SQL*Net message to client                    1501        0.00          0.00
db file sequential read                       800        0.05          0.80
SQL*Net message from client                  1501        0.00          0.69
********************************************************************************The DBMS_XPLAN.DISPLAY_CURSOR output:
SQL> -- put your statement here
SQL> -- use the GATHER_PLAN_STATISTICS hint
SQL> -- if you're not using STATISTICS_LEVEL = ALL
SQL> select /*+ gather_plan_statistics */
2 *
3 from
4 t_demo
5 where
6 type = 'VIEW'
7 order by
8 id;
149938 rows selected.
Elapsed: 00:00:02.21
SQL>
SQL> select * from table(dbms_xplan.display_cursor(null, null, 'ALLSTATS LAST'));
PLAN_TABLE_OUTPUT
SQL_ID d4k5acu783vu8, child number 0
select   /*+ gather_plan_statistics */          * from          t_demo
where          type = 'VIEW' order by          id
Plan hash value: 1390505571
| Id | Operation                   | Name     | Starts | E-Rows | A-Rows |   A-Time   | Buffers | Reads |
|   0 | SELECT STATEMENT            |          |      1 |        |    149K|00:00:00.02 |     149K|   1183 |
|   1 | TABLE ACCESS BY INDEX ROWID| T_DEMO   |      1 |      1 |    149K|00:00:00.02 |     149K|   1183 |
|* 2 |   INDEX RANGE SCAN          | IDX_DEMO |      1 |      1 |    149K|00:00:00.02 |    1880 |    383 |
Predicate Information (identified by operation id):
   2 - access("TYPE"='VIEW')
20 rows selected.I'm looking forward for suggestions how to improve the performance of this statement.
*-- End of template body --*
I'm sure that if you follow these instructions and obtain the information described, post them using a proper formatting (don't forget about the \ tag) you'll receive meaningful advice very soon.
So, just to make sure you didn't miss this point:Use proper formatting!
If you think I missed something important in this sample post let me know so that I can improve it.
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

Alex Nuijten wrote:
...you missed the proper formatting of the Autotrace section ;-)Alex,
can't reproduce, does it still look unformatted? Or are you simply kidding? :-)
Randolf
PS: Just noticed that it actually sometimes doesn't show the proper formatting although the code tags are there. Changing to the \ tag helped in this case, but it seems to be odd.
Edited by: Randolf Geist on Feb 23, 2009 11:28 AM
Odd behaviour of forum software

Does WCS come with the 5508 WLC?

Forum
I am providing a quote to a client for a wireless installation. I have two 5508 boxes and about 40 AP's on the quote, as well as associated SmartNet.
I was reading how the Cisco Unified Wireless Network is comprised of:
Controllers
Access Points
The Cisco Wireless Control System (WCS)
Cisco Mobility Services Engine
My questions are:
1. Does WCS come installed on the Controller? Is this something that the customer receives simply by virtue of the fact that they are purchasing the Controller? Or is this a separate piece of software with a cost?
2. What exactly is the Cisco Mobility Services Engine? What does it do that the Controller will not? How would I sell one to a customer?
Thank You
Kevin

WCS is a Windows 2003 application (so not "on the controller") that is completely separate and has to be purchased separately with different levels of licensing for different feature sets.
WCS is most useful when having several WLCs to manage and is offered when you buy a lot of stuff I think.
WCS alone brings better reporting features (graphs, pdf reports, ...) and maps to visualize everything.
MSE is a kind of "calculation appliance" that you link to your WCS to locate all clients and rogues in real-time on the map. Only that. But it's a cool enough feature :-) Without MSE you can only view one client at a time (when entering its mac address in the search field) on WCS maps.
Nicolas

Need help in tuning a procedure

DECLARE
CURSOR Cur_sub_rp IS
SELECT A.SUB_ACCOUNT, B.PH_basic_srv,B.PH_Salesman,A.SUB_SSN
FROM STG_SUB_MASTER_MONTH_HISTORY A, STG_PHN_MASTER_MONTH_HISTORY
B
WHERE A.SUB_ACCOUNT = B.PH_ACCOUNT (+)
AND A.MONTH_ID = B.MONTH_ID ;
TYPE t_values_tab IS TABLE OF cur_sub_rp%rowtype ;
values_tab t_values_tab := t_values_tab() ;
BEGIN
OPEN Cur_sub_rp ;
LOOP
FETCH Cur_sub_rp BULK COLLECT INTO Values_tab
LIMIT 1000;
EXIT WHEN Cur_sub_rp%NOTFOUND ;
END LOOP ;
CLOSE Cur_sub_rp;
FORALL i IN VALUES_TAB.first..values_tab.last
INSERT INTO SUB_PHN_1 VALUES VALUES_TAB(i);
commit;
END;
The tables used here has 9 million records each.
The total process takes around 19 minutes.
Need your help in optimizing the process.

i have tried using
Create table as SELECT A.SUB_ACCOUNT, B.PH_basic_srv,B.PH_Salesman,A.SUB_SSN
                    FROM STG_SUB_MASTER_MONTH_HISTORY A, STG_PHN_MASTER_MONTH_HISTORY
B
                    WHERE A.SUB_ACCOUNT = B.PH_ACCOUNT (+)
                    AND A.MONTH_ID = B.MONTH_ID (+);But still taking long time(apprx 15 min).
so used this...
help me in tuning the query in either of this.
DECLARE
CURSOR Cur_sub_rp IS
                SELECT A.SUB_ACCOUNT, B.PH_basic_srv,B.PH_Salesman,A.SUB_SSN
                    FROM STG_SUB_MASTER_MONTH_HISTORY A, STG_PHN_MASTER_MONTH_HISTORY
B
                    WHERE A.SUB_ACCOUNT = B.PH_ACCOUNT (+)
                    AND A.MONTH_ID = B.MONTH_ID (+);
TYPE t_values_tab IS TABLE OF cur_sub_rp%rowtype ;
values_tab t_values_tab := t_values_tab() ;
BEGIN
    OPEN Cur_sub_rp ;
    LOOP
        FETCH Cur_sub_rp BULK COLLECT INTO Values_tab
                                            LIMIT 1000;
        EXIT WHEN Cur_sub_rp%NOTFOUND ;
    END LOOP ;
    CLOSE Cur_sub_rp;
FORALL i IN VALUES_TAB.first..values_tab.last
INSERT INTO SUB_PHN_1 VALUES VALUES_TAB(i);
commit;
END;Message was edited by:
Vakeel
Message was edited by:
Vakeel

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