Poor performance and high number of gets on seemingly simple insert/select
Versions & config:
Database : 10.2.0.4.0
Application : Oracle E-Business Suite 11.5.10.2
2 node RAC, IBM AIX 5.3Here's the insert / select which I'm struggling to explain why it's taking 6 seconds, and why it needs to get > 24,000 blocks:
INSERT INTO WF_ITEM_ATTRIBUTE_VALUES ( ITEM_TYPE, ITEM_KEY, NAME, TEXT_VALUE,
NUMBER_VALUE, DATE_VALUE ) SELECT :B1 , :B2 , WIA.NAME, WIA.TEXT_DEFAULT,
WIA.NUMBER_DEFAULT, WIA.DATE_DEFAULT FROM WF_ITEM_ATTRIBUTES WIA WHERE
WIA.ITEM_TYPE = :B1
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 4 0
Execute 2 3.44 6.36 2 24297 198 36
Fetch 0 0.00 0.00 0 0 0 0
total 3 3.44 6.36 2 24297 202 36
Misses in library cache during parse: 1
Misses in library cache during execute: 2Also from the tkprof output, the explain plan and waits - virtually zero waits:
Rows Execution Plan
0 INSERT STATEMENT MODE: ALL_ROWS
0 TABLE ACCESS MODE: ANALYZED (BY INDEX ROWID) OF 'WF_ITEM_ATTRIBUTES' (TABLE)
0 INDEX MODE: ANALYZED (RANGE SCAN) OF 'WF_ITEM_ATTRIBUTES_PK' (INDEX (UNIQUE))
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
library cache lock 12 0.00 0.00
gc current block 2-way 14 0.00 0.00
db file sequential read 2 0.01 0.01
row cache lock 24 0.00 0.01
library cache pin 2 0.00 0.00
rdbms ipc reply 1 0.00 0.00
gc cr block 2-way 4 0.00 0.00
gc current grant busy 1 0.00 0.00
********************************************************************************The statement was executed 2 times. I know from slicing up the trc file that :
exe #1 : elapsed = 0.02s, query = 25, current = 47, rows = 11
exe #2 : elapsed = 6.34s, query = 24272, current = 151, rows = 25
If I run just the select portion of the statement, using bind values from exe #2, I get small number of gets (< 10), and < 0.1 secs elapsed.
If I make the insert into an empty, non-partitioned table, I get :
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.01 0.08 0 137 53 25
Fetch 0 0.00 0.00 0 0 0 0
total 2 0.01 0.08 0 137 53 25and same explain plan - using index range scan on WF_Item_Attributes_PK.
This problem is part of testing of a database upgrade and country go-live. On a 10.2.0.3 test system (non-RAC), the same insert/select - using the real WF_Item_Attributes_Value table takes :
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.10 10 27 136 25
Fetch 0 0.00 0.00 0 0 0 0
total 2 0.00 0.10 10 27 136 25So I'm struggling to understand why the performance on the 10.2.0.4 RAC system is so much worse for this query, and why it's doing so many gets. Suggestions, thoughts, ideas welcomed.
I've verified system level things - CPUs weren't/aren't max'd out, no significant paging/swapping activity, run queue not long. AWR report for the time period shows nothing unusual.
further info on the objects concerned:
query source table :
WF_Item_Attributes_PK : unique index on Item_Type, Name. Index has 144 blocks, non-partitioned
WF_Item_Attributes tbl : non-partitioned, 160 blocks
insert destination table:
WF_Item_Attribute_Values:
range partitioned on Item_Type, and hash sub-partitioned on Item_Key
both executions of the insert hit the partition with the most data : 127,691 blocks total ; 8 sub-partitions with 15,896 to 16,055 blocks per sub-partition.
WF_Item_Attribute_Values_PK : unique index on columns Item_Type, Item_Key, Name. Range/hash partitioned as per table.
Bind values:
exe #1 : Item_Type (:B1) = OEOH, Item_Key (:B2) = 1048671
exe #2 : Item_Type (:B1) = OEOL, Item_Key (:B2) = 4253168
number of rows in WF_Item_Attribute_Values for Item_Type = OEOH : 1132587
number of rows in WF_Item_Attribute_Values for Item_Type = OEOL : 18763670
The non-RAC 10.2.0.3 test system (clone of Production from last night) has higher row counts for these 2.
thanks and regards
Ivan
hi Sven,
Thanks for your input.
1) I guess so, but I haven't lifted the lid to delve inside the form as to which one. I don't think it's the cause though, as I got poor performance running the insert statement with my own value (same statement, using my own bind value).
2) In every execution plan I've seen, checked, re-checked, it uses a range scan on the primary key. It is the most efficient I think, but the source table is small in any case - table 160 blocks, PK index 144 blocks. So I think it's the partitioned destination table that's the problem - but we only see this issue on the 10.2.0.4 pre-production (RAC) system. The 10.2.0.3 (RAC) Production system doesn't have it. This is why it's so puzzling to me - the source table read is fast, and does few gets.
3) table storage details below - the Item_Types being used were 'OEOH' (fast execution) and 'OEOL' (slow execution). Both hit partition WF_ITEM49, hence I've only expanded the subpartition info for that one (there are over 600 sub-partitions).
============= From DBA_Part_Tables : Partition Type / Count =============
PARTITI SUBPART PARTITION_COUNT DEF_TABLESPACE_NAME
RANGE HASH 77 APPS_TS_TX_DATA
1 row selected.
============= From DBA_Tab_Partitions : Partition Names / Tablespaces =============
Partition Name TS Name High Value High Val Len
WF_ITEM1 APPS_TS_TX_DATA 'A1' 4
WF_ITEM2 APPS_TS_TX_DATA 'AM' 4
WF_ITEM3 APPS_TS_TX_DATA 'AP' 4
WF_ITEM47 APPS_TS_TX_DATA 'OB' 4
WF_ITEM48 APPS_TS_TX_DATA 'OE' 4
WF_ITEM49 APPS_TS_TX_DATA 'OF' 4
WF_ITEM50 APPS_TS_TX_DATA 'OK' 4
WF_ITEM75 APPS_TS_TX_DATA 'WI' 4
WF_ITEM76 APPS_TS_TX_DATA 'WS' 4
WF_ITEM77 APPS_TS_TX_DATA MAXVALUE 8
77 rows selected.
============= From dba_part_key_columns : Partition Columns =============
NAME OBJEC Column Name COLUMN_POSITION
WF_ITEM_ATTRIBUTE_VALUES TABLE ITEM_TYPE 1
1 row selected.
PPR1 sql> @q_tabsubpart wf_item_attribute_values WF_ITEM49
============= From DBA_Tab_SubPartitions : SubPartition Names / Tablespaces =============
Partition Name SUBPARTITION_NAME TS Name High Value High Val Len
WF_ITEM49 SYS_SUBP3326 APPS_TS_TX_DATA 0
WF_ITEM49 SYS_SUBP3328 APPS_TS_TX_DATA 0
WF_ITEM49 SYS_SUBP3332 APPS_TS_TX_DATA 0
WF_ITEM49 SYS_SUBP3331 APPS_TS_TX_DATA 0
WF_ITEM49 SYS_SUBP3330 APPS_TS_TX_DATA 0
WF_ITEM49 SYS_SUBP3329 APPS_TS_TX_DATA 0
WF_ITEM49 SYS_SUBP3327 APPS_TS_TX_DATA 0
WF_ITEM49 SYS_SUBP3325 APPS_TS_TX_DATA 0
8 rows selected.
============= From dba_part_key_columns : Partition Columns =============
NAME OBJEC Column Name COLUMN_POSITION
WF_ITEM_ATTRIBUTE_VALUES TABLE ITEM_KEY 1
1 row selected.
from DBA_Segments - just for partition WF_ITEM49 :
Segment Name TSname Partition Name Segment Type BLOCKS Mbytes EXTENTS Next Ext(Mb)
WF_ITEM_ATTRIBUTE_VALUES @TX_DATA SYS_SUBP3332 TblSubPart 16096 125.75 1006 .125
WF_ITEM_ATTRIBUTE_VALUES @TX_DATA SYS_SUBP3331 TblSubPart 16160 126.25 1010 .125
WF_ITEM_ATTRIBUTE_VALUES @TX_DATA SYS_SUBP3330 TblSubPart 16160 126.25 1010 .125
WF_ITEM_ATTRIBUTE_VALUES @TX_DATA SYS_SUBP3329 TblSubPart 16112 125.875 1007 .125
WF_ITEM_ATTRIBUTE_VALUES @TX_DATA SYS_SUBP3328 TblSubPart 16096 125.75 1006 .125
WF_ITEM_ATTRIBUTE_VALUES @TX_DATA SYS_SUBP3327 TblSubPart 16224 126.75 1014 .125
WF_ITEM_ATTRIBUTE_VALUES @TX_DATA SYS_SUBP3326 TblSubPart 16208 126.625 1013 .125
WF_ITEM_ATTRIBUTE_VALUES @TX_DATA SYS_SUBP3325 TblSubPart 16128 126 1008 .125
WF_ITEM_ATTRIBUTE_VALUES_PK @TX_IDX SYS_SUBP3332 IdxSubPart 59424 464.25 3714 .125
WF_ITEM_ATTRIBUTE_VALUES_PK @TX_IDX SYS_SUBP3331 IdxSubPart 59296 463.25 3706 .125
WF_ITEM_ATTRIBUTE_VALUES_PK @TX_IDX SYS_SUBP3330 IdxSubPart 59520 465 3720 .125
WF_ITEM_ATTRIBUTE_VALUES_PK @TX_IDX SYS_SUBP3329 IdxSubPart 59104 461.75 3694 .125
WF_ITEM_ATTRIBUTE_VALUES_PK @TX_IDX SYS_SUBP3328 IdxSubPart 59456 464.5 3716 .125
WF_ITEM_ATTRIBUTE_VALUES_PK @TX_IDX SYS_SUBP3327 IdxSubPart 60016 468.875 3751 .125
WF_ITEM_ATTRIBUTE_VALUES_PK @TX_IDX SYS_SUBP3326 IdxSubPart 59616 465.75 3726 .125
WF_ITEM_ATTRIBUTE_VALUES_PK @TX_IDX SYS_SUBP3325 IdxSubPart 59376 463.875 3711 .125
sum 4726.5
[the @ in the TS Name is my shortcode, as Apps stupidly prefixes every ts with "APPS_TS_"]
The Tablespaces used for all subpartitions are UNIFORM extent mgmt, AUTO segment_space_management ; LOCAL extent mgmt.regards
Ivan
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while (line != null){
abcd = Integer.parseInt(line.substring(0,4).trim());
efgh = line.substring(31,36).trim();
ijkl = line.substring(36,42).trim();
mnop = line.substring(24,31).trim();
cs.setInt(1, abcd);
cs.setString(2, efgh);
cs.setString(3, ijkl);
cs.setString(4, mnop);
cs.setInt(5, wDimId);
cs.setInt(6, tDimId);
cs.setInt(7, iDimId);
cs.setInt(8, sDimId);
cs.setString(9, cFlg);
cs.registerOutParameter(5, java.sql.Types.INTEGER);
cs.registerOutParameter(6, java.sql.Types.INTEGER);
cs.registerOutParameter(7, java.sql.Types.INTEGER);
cs.registerOutParameter(8, java.sql.Types.INTEGER);
cs.registerOutParameter(9, java.sql.Types.VARCHAR);
cs.executeUpdate();
wDimId = cs.getInt(5);
tDimId = cs.getInt(6);
iDimId = cs.getInt(7);
sDimId = cs.getInt(8);
cFlg = cs.getString(9);
cs.clearParameters();
* Logic to deal with DimId's
//read next line
synchronized (br){
line = br.readLine();
// if an exception occurs, let the thread die but don't exit the application
catch(Exception ex){
ex.printStackTrace();
finally{
//close connection and CallableStatement objects
try{
if (cs != null) cs.close();
if (con != null && !con.isClosed()) con.close();
catch(SQLException ex){
ex.printStackTrace();
private static void closeResources(){
//Close IO resources
} -
Very poor speeds and high error counts?
Hi guys,
I have been reading through some threads on the forum but still cannot find any information regarding my poor connection. My connection runs extremely slow and eventually leads to me being unable to load webpages.
I had a look through my ADSL settings and found some high CRC and HEC events which I presume are not good! I have copied and pasted the results below.
Any help would be greatly appreciated as I have had no luck after calling the call centres...
ADSL Line Status
Connection Information
Line state:
Connected
Connection time:
1 days, 08:15:37
Downstream:
14.27 Mbps
Upstream:
1.07 Mbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Fast
Noise margin (Down/Up):
6.6 dB / 7.5 dB
Line attenuation (Down/Up):
21.8 dB / 11.1 dB
Output power (Down/Up):
20.4 dBm / 12.6 dBm
FEC Events (Down/Up):
0 / 0
CRC Events (Down/Up):
3705026 / 8470
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
18038215 / 2958
Error Seconds (Local/Remote):
78523 / 3326Hi, thanks for the speedy reply! The results from above are not whilst connected to a test line
The quiet line test seems fine.
I have just put it into the test socket and the internet does seem much more repsonsive when I go onto websites.
There still seems to be a few errors on the ADSL settings.
ADSL Line Status
Connection Information
Line state:
Connected
Connection time:
0 days, 00:05:38
Downstream:
18.24 Mbps
Upstream:
1.063 Mbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Fast
Noise margin (Down/Up):
6.1 dB / 7.0 dB
Line attenuation (Down/Up):
21.3 dB / 11.0 dB
Output power (Down/Up):
20.3 dBm / 12.6 dBm
FEC Events (Down/Up):
0 / 0
CRC Events (Down/Up):
18 / 9081
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
71 / 2989
Error Seconds (Local/Remote):
16 / 3345 -
Weak performance and high cpu usage
I've been wondering for sometime now, how can some flash games run so laggy on my pc at the same time where i run DX and OpenGL games without any problem and smooth!
Whenever i play games in FB or any other site, i notice high cpu usage about 70-90% especially when i run them fullscreen (1152x864) and with effects enabled then my system kneals almost!!!!!! This is UNACCEPTABLE of course..
I also found an interesting article which i dought if it has been updated as it was supposed to, which is the following link: http://forums.adobe.com/message/5417983#5417983
I run Flash player on an Intel E5700 - Win XP sp3 - 4GB ram and an Nvidia GTX650.. for those who understand, such a system is in position to run flash games like an adult holds a baby in his arms... so either the hardware acceleration does not work or adobe has let this problem unresolved for years now as i have made an interesting research on this case before i come here.
For the records, i run flash games within Chrome since it's proved to be the most apropriate browser for videos and flash-shockwave games.. firefox comes 2nd to me and IE 8.....leave it unused better!
Even in 2006 up to today, people are facing high cpu usage and weak performance in flash apps no matter what pc they have, so who is to blame here?? Adobe ofc.
Is there anyone who has a solution to propose or has found somethin relevant to this case? Or should we wait a solution in 2020?Mike M., i didn't give any load or credit on u, but Adobe, as i see you're not responsible for their mistakes or ignorance so i have nothin to ask from u, i have seen that u reply to ppl and good for u.
All i have to say to what u replied, is that, what if win xp reach the end of life? i mention a problem that remains for years now and is unresolved, or didn't they see that the previous years?since 2008 let's say!!!
I have noticed the same exactly behavior on newer OS and specifically tested on Win Vista 32-64 and Win 7 32-64 too..... it's EXACTLY the same behavior, so it's not OS dependant, i won't take any excuse for Adobe cause i have experienced their terrible work on flash-shockwave for too long.
It's their responsibility to solve it but they have chosen to ignore this and many other mistakes that users report weekly for years, their response is 2/10 solved... it's just disgusting. I dont' want to argue with anyone for Adobe's shake, they don't worth it. -
Poor performance and increase CPU on UNIX 64 bit
Hi
I have moved one of my 300GB test databases from a 4GB RAM 2x DUAL zeon 3GHz processors LINUX machine to a UNIX 64 bit 6GB RAM 2x1GHz USIIIi processor machine. Both have the oracle data stored on RAID 5 disk.
Both Oracle versions are the same. The data was transered via export/import.
Running exactly the same queries the UNIX box is up to 3 times slower and sits at 100% CPU, wheras LINUX machine sits between 30-50% CPU and performance is really good. No other users are accessing the machines.
Statspack reports look very similar, both have 100%/near 100% instance efficiency. top wait events on both machines are control file parallel write and db file sequential read, but even the values for these do not look worrying. The only difference is there is more memory allocated to the SGA of the UNIX server.
Any ideas as to why the UNIX 64bit server is slower and using 100%CPU would be greatly received.
ThanksLINUX
SELECT
count(*)
FROM
mastermap.topographicline
WHERE
descriptivegroup like :"SYS_B_00"
and
descriptiveterm like :"SYS_B_01"
and
physicalpresence = :"SYS_B_02"
AND
sdo_filter(geom, mdsys.sdo_geometry(:"SYS_B_03", :"SYS_B_04", null,
mdsys.sdo_elem_info_array (:"SYS_B_05", :"SYS_B_06", :"SYS_B_07"),
mdsys.sdo_ordinate_array (:"SYS_B_08", :"SYS_B_09", :"SYS_B_10",:"SYS_B_11")), :"SYS_B_12")=:"SYS_B_13"
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 2 0 0
Execute 1 0.01 0.01 0 11 2 0
Fetch 2 0.20 0.18 0 10713 0 1
total 4 0.21 0.19 0 10726 2 1
UNIX
SELECT
count(*)
FROM
mastermap.topographicline
WHERE
descriptivegroup like :"SYS_B_00"
and
descriptiveterm like :"SYS_B_01"
and
physicalpresence = :"SYS_B_02"
AND
sdo_filter(geom, mdsys.sdo_geometry(:"SYS_B_03", :"SYS_B_04", null,
mdsys.sdo_elem_info_array (:"SYS_B_05", :"SYS_B_06", :"SYS_B_07"),
mdsys.sdo_ordinate_array (:"SYS_B_08", :"SYS_B_09", :"SYS_B_10",:"SYS_B_11")), :"SYS_B_12")=:"SYS_B_13"
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.03 0.02 0 42 2 0
Fetch 2 0.24 0.34 0 10707 0 1
total 4 0.27 0.36 0 10749 2 1
The elapsed time is twice as slow on unix, and it seems to be a fetch issue. Any ideas? -
Poor performance and duplicate apps after migration
I migrated from a G4 ti book to a MacBook pro and have never been happy. I have duplicate applications and one will say in parens (from old mac) behind the name. It also moves very slow, especially in Eudora. I made a new user on the new computer in hopes to start fresh in Apple mail etc but when I switch to that user (the first one on the computer) Safari won't work. On and ON... I am so frustrated, nothing works right, even slower than my tibook and I don't know where to start to try to fix it. Should I try to figure out what I have done in the last 3 weeks and pull it off and 'restart" the whole process?
Help,
DebbieSo are you saying that I revert back to factory settings and start over? I still don't understand why I would have 2 applications identical except the (from old mac). Example - "Adobe indesign CS2" then the next folder is "Adobe Indesign CS2 (from old mac) ".
does that mean the application is on the machine twice? -
Hello,
I have a simple while loop in my JSP code which accesses a javabean data item on each iteration. The loop is causing a 2 � 3 second delay between converses of the web pages.
Does any one else suffer the same type of performance sacrifices when using loops in their JSP code?
Any suggestions of increasing the response time for the JSP?
Code below,
Thanks in advance.
<% { int i = 0;
String par;
while (i < 99) {
par = (PARENT_SCREEN_ID.getTextValue(i));
if (par.equals("SM")) { %> mm_menu_1120099999_1_1.addMenuItem("<%= SCREEN_MSG.getTextValue(i) %>", "clickNav('<%= NAV_SCREEN_ID.getTextValue(i) %>');");
<% } else if (par.equals("DM")) { %> mm_menu_1120099999_1_2.addMenuItem("<%= SCREEN_MSG.getTextValue(i) %>", "clickNav('<%= NAV_SCREEN_ID.getTextValue(i) %>');");
<% } else if (par.equals("AM")) { %> mm_menu_1120099999_1_3.addMenuItem("<%= SCREEN_MSG.getTextValue(i) %>", "clickNav('<%= NAV_SCREEN_ID.getTextValue(i) %>');");
<% } else if (par.equals("PM")) { %> mm_menu_1120099999_1_4.addMenuItem("<%= SCREEN_MSG.getTextValue(i) %>", "clickNav('<%= NAV_SCREEN_ID.getTextValue(i) %>');");
<% } else if (par.equals("FM")) { %> mm_menu_1120099999_1_5.addMenuItem("<%= SCREEN_MSG.getTextValue(i) %>", "clickNav('<%= NAV_SCREEN_ID.getTextValue(i) %>');");
<% } else if (par.equals("MC")) { %> mm_menu_1120099999_1_7.addMenuItem("<%= SCREEN_MSG.getTextValue(i) %>", "clickNav('<%= NAV_SCREEN_ID.getTextValue(i) %>');");
<% } else if (par.equals("EM")) { %> mm_menu_1120099999_1_8.addMenuItem("<%= SCREEN_MSG.getTextValue(i) %>", "clickNav('<%= NAV_SCREEN_ID.getTextValue(i) %>');");
<% } else if (par.equals(" ")) { i = 98;
} i = i + 1;
} %>Does any one else suffer the same type of performance sacrifices when using loops in their JSP code?only if i write badly performing loops.
The fact its JSP is irrelavant, my guess is that your loop is very slow.
Its hard to pinpoint where its slow becuase with all the sriplets its hard to read
Some weird things to, you write PARENT_SCREEN_ID.getTextValue(i)
This looks like you execute a method on a constant, its confusing too, what is that PARENT_SCREEN_ID ? what does the getTextValue do ?
Maybe you are looking for
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