Performance question for date column

Hi All,
I have a select query which joins two tables with more than 20 million records each based on a where condition of year = 2006. Would creating an function based index on the date column help improve the performance. Please suggest any other alternatives. The query is supposed to return about 10 million records which is taking about 10 hrs right now. How can I improve the performance.
Thanks

Rob, Here is the explain plan. Any suggestions based on this information. Please refer me to any information on how to interpret this information. Thanks
| Id | Operation            | Name                      | Rows | Bytes |TempSpc| Cost | Pstart| Pstop |
|   0 | SELECT STATEMENT     |                            |   101K|    10M|       |   173K|       |       |
|   1 | HASH JOIN           |                            |   101K|    10M| 3088K|   173K|       |       |
|   2 |   PARTITION RANGE ALL|                            |       |       |       |       |     1 |     9 |
|   3 |    TABLE ACCESS FULL | Table A                    |   101K| 1888K|       | 87464 |     1 |     9 |
|   4 |   PARTITION RANGE ALL|                            |       |       |       |       |     1 |     9 |
|   5 |    TABLE ACCESS FULL | Table B                    |   156K|    13M|       | 85454 |     1 |     9 |

Similar Messages

Using number datatype for date column

Hi
Is there a side effect for using "number" datatype for "date" column?
If so, what is the disadvantage?
Many thanks

Hi,
Ora_83 wrote:
Hi
Is there a side effect for using "number" datatype for "date" column?
If so, what is the disadvantage?Yes, there's a definite disadvantage.
Oracle provides date arithmetic and a number of functions for manipulating DATEs. None of them work with numbers.
For example,
SELECT    TRUNC (order_date, 'MONTH')     AS order_month
,       AVG (ship_date - order_date)     AS avg_delay
FROM       orders
GROUP BY TRUNC (order_date, 'MONTH')
;order_month involves a DATE function; it's pretty easy to find the month that conatins order_date.
avg_delay involves date arithmetic. It's extrememly easy to find how much the time passed between order_date and ship_date.
Depending on how you code dates as numbers, doing either one of the above may be just as easy, but doing the other will be very difficult. You'll waste a lot of effort converting the NUMBERs to real DATEs whenever you need to manipulate them.
Validation can be very difficult for NUMBERs, also.
Watch this forum. It's a rare day when there's not some question about how to get around a problem caused by storing dates in a NUMBER (or VARCHAR2) column. Don't add to that. Always use DATE columns for dates.

APEX_UTIL.IR_FILTER with BETWEEN operator for date columns

Hi,
when I run my application I can set a BETWEEN-filter for date columns. I can't find a way how to use it with the APEX_UTIL.IR_FILTER function. Maybe I miss something?
Documentation: http://download.oracle.com/docs/cd/E17556_01/doc/apirefs.40/e15519/apex_util.htm#CHDDDFBF
Tobias

Tobias,
If you think about it, a "Between" is nothing more than a single line way to say
WHERE :X >= :Y
AND :X <= :Z
So you should be able to apply two filters to the report using the LTE and GTE operators
Hope this helps
Doug Gault
www.sumneva.com

JQuery format mask for date columns in tabular form

Hi,
How can I apply jQuery format mask for date columns in a tabular form?
Thanks.
Andy

OK, I realized I didn't choose the default type as "Pl/SQL Expression", now it's working correctly.
Thank you very much!

IFNULL Equivalent for Date Columns

Hello experts,
is it possible to have an ifunull like function for dates that aren't there in the DB on 10g. For example I get the date format in 00/00/00 and I want it to show 'N/A' instead.
Best Regards

Hi zaid,
Write a case function on the date column f(x) like this,this will work
case when date='00/00/00' then 'N/A' else date end;
UPDATE POST
check your date column data type....if its date or varchar.....change according to your requirment by using it in RPD
like cast(date as varchar) then at answers end you apply this case function in f(x)
Hope answers your question.
Cheers,
KK
Edited by: Kranthi on Feb 8, 2011 2:41 AM

Attached document for data column in BPS Web application

Hi,
I have created layout for a BPS application, the layout has been configured to have the ability to allow the used to create the attached documentd for the data column. when the user open the layout through the planning profile, the icon for those documents is displayed and can be open by click those icons. After we generated the Web applicatios, those icons are gone and the user can not open them any more.
I notice that there is document subcomponent under BPS-WB, I added that subcomponent to my web layout, it still not work.Anybody know how to display the attached documents on the Web, Is this doable?

Hi Marc,
I did exactly what you mention in your responce e-mail, but it still not work coreectly.
following is my propperty configuration for layout and documents:
Planning layout (layout_lay01)
Only ready for output: True
Row/Cell Selection: Cell
Event on selection: true
Document on planning layout (Document1)
Layout: = layout_lay01
Only ready for output: false
When I launch the application through the Tcode BPS_WIF0
There is no document icon display for each data columns which can been in UPSPL. Instead there is a generic document input/display space under the lauout,however there is no any document display within the box, and I can not input anything within the document box. I changes some of the property for the layout and document, but it not work.
Did I forget some thing?

Edit Renderer for Date columns

I tried to use EditRenderer for a column that is a Date. BC4J automatically renders this as DateField, but I don't want this, so I set the EditRenderer to something else. But it seems BC4J ignores this and renders it as DateField (for Varchar fields it works well).
I use JDev 9.0.3.3 and UIX+JSP.

I found it out: on the Control Hints tab change the Control type from "default" to "edit" and the EditRenderer works

Which type of index is useful for date columns with time stamp

Hi all,
I am using date column in the where clause of an SQL Query. The values stored in the date column are includes timestamp. The query is very slow and there is no index on the date column.
Can any body suggest which index is better on date columns
Thanks

I am using date column in the where clause of an SQL Query.Dates a re hard queries to tune. This ...
WHERE start_date BETWEEN to_date('01-SEP-05') AND to_date('02-SEP-05')...probably requires a very different execution plan to this...
WHERE start_date BETWEEN to_date('01-JAN-01') AND to_date('02-SEP-05')Just bunging an index on the date column may speed up your specific query but break something else. So be careful.
Cheers, APC

Performance question - Caching data of a big table

Hi All,
I have a general question about caching, I am using an Oracle 11g R2 database.
I have a big table about 50 millions of rows that is accessed very often by my application. Some query runs slow and some are ok. But (obviously) when the data of this table are already in the cache (so basically when a user requests the same thing twice or many times) it runs very quickly.
Does somebody has any recommendations about caching the data / table of this size ?
Many thanks.

Chiwatel wrote:
With better formatting (I hope), sorry I am not used to the new forum !
Plan hash value: 2501344126
| Id | Operation                            | Name          | Starts | E-Rows |E-Bytes| Cost (%CPU)| Pstart| Pstop | A-Rows | A-Time | Buffers | Reads | OMem | 1Mem | Used-Mem |
| 0 | SELECT STATEMENT        |                    |      1 |        |      | 7232 (100)|      |      | 68539 |00:14:20.06 |    212K| 87545 |      |      |          |
| 1 | SORT ORDER BY                      |                |      1 | 7107 | 624K| 7232 (1)|      |      | 68539 |00:14:20.06 |    212K| 87545 | 3242K| 792K| 2881K (0)|
2 | NESTED LOOPS                      |                |      1 |        |      |            |      |      | 68539 |00:14:19.26 |    212K| 87545 |      |      |          |
| 3 |    NESTED LOOPS                      |                |      1 | 7107 | 624K| 7230 (1)|      |      | 70492 |00:07:09.08 |    141K| 43779 |      |      |          |
* 4 |    INDEX RANGE SCAN                | CM_MAINT_PK_ID |      1 | 7107 | 284K|    59 (0)|      |      | 70492 |00:00:04.90 |    496 |    453 |      |      |          |
| 5 |    PARTITION RANGE ITERATOR        |                | 70492 |      1 |      |    1 (0)| KEY | KEY | 70492 |00:07:03.32 |    141K| 43326 |      |      |          |
|* 6 |      INDEX UNIQUE SCAN              | D1T400P0      | 70492 |      1 |      |    1 (0)| KEY | KEY | 70492 |00:07:01.71 |    141K| 43326 |      |      |          |
|* 7 |    TABLE ACCESS BY GLOBAL INDEX ROWID| D1_DVC_EVT    | 70492 |      1 |    49 |    2 (0)| ROWID | ROWID | 68539 |00:07:09.17 | 70656 | 43766 |      |      |          |
Predicate Information (identified by operation id):
4 - access("ERO"."MAINT_OBJ_CD"='D1-DEVICE' AND "ERO"."PK_VALUE1"='461089508922')
6 - access("ERO"."DVC_EVT_ID"="E"."DVC_EVT_ID")
7 - filter(("E"."DVC_EVT_TYPE_CD"='END-GSMLOWLEVEL-EXCP-SEV-1' OR "E"."DVC_EVT_TYPE_CD"='STR-GSMLOWLEVEL-EXCP-SEV-1'))
Your user has executed a query to return 68,000 rows - what type of user is it, a human being cannot possibly cope with that much data and it's not entirely surprising that it might take quite some time to return it.
One thing I'd check is whether you're always getting the same execution plan - Oracle's estimates here are out by a factor of about 95 (7,100 rows predicted vs. 68,500 returned) perhaps some of your variation in timing relates to plan changes.
If you check the figures you'll see about half your time came from probing the unique index, and half came from visiting the table. In general it's hard to beat Oracle's caching algorithms, but indexes are often much smaller than the tables they cover, so it's possible that your best strategy is to protect this index at the cost of the table. Rather than trying to create a KEEP cache the index, though, you MIGHT find that you get some benefit from creating a RECYCLE cache for the table, using a small percentage of the available memory - the target is to fix things so that table blocks you won't revisit don't push index blocks you will revisit from memory.
Another detail to consider is that if you are visiting the index and table completely randomly (for 68,500 locations) it's possible that you end up re-reading blocks several times in the course of the visit. If you order the intermediate result set from the from the driving table first you may find that you're walking the index and table in order and don't have to re-read any blocks. This is something only you can know, though. THe code would have to change to include an inline view with a no_merge and no_eliminate_oby hint.
Regards
Jonathan Lewis

Wireing Question for Data Center

I work in what I would consider to be a small/mid sized data center. We use two 6513 as the core/distribution for ~25 racks of servers.
My question comes in the way of cabling the servers to the core. Currently they are using long patch cords between the 6513 and each server. Well its a mess, functional but messy.
I'm trying to figure out the best way to clean up the mess and make it look professional.
Most people seem to suggest 2 different ways to accomplish this:
1) Install switches in each rack and run fiber from the core to the rack. Wire each server to the switch in the rack.
2) Install 24/48 port patch panels between the core area and the racks.
I'm wondering what people think of these ideas and if there are any other suggested ways of accomplishing this?
Andy

Hi Andy,
Here's something that we used to do where I worked:
We had 6509's with three/four 48 port blades servicing between 150 and 200 phones roughly. I had four total switches, one on each of four floors. So this would be roughly similar to your DC environment, only we're servicing longer horizontal runs and phones, not servers -- but the idea is the same (i.e. high density cabling issues).
Lord knows that when you're plugging in 48 cables into one of those blades, it can get pretty crowded. And since we don't yet know how to alter the laws of physics that determine space requirements, we have to search for alternatives.
Back to my environment: On three of the four floors, we just wired straight from the patch panel (that ran to floor locations) to the switch. Quite a mess when you're running in 48 cables to one blade! However, this is traditional and this is what we did. My cabling guy (very smart fella) suggested something else. At the time I was too chicken to do it on the other floors, but I did agree to try it on one floor. Here's what we did:
He ran Cat5 (at the time, that was standard) connections in 48 cable bunches from an adjacent wall into the switch. They had RJ-45 connections so that they could plug in, and they were all nice and neat. On the other end, they plugged in to a series of punch down blocks (kind of like you see in a phone room for telephone structured cabling). These, in turn, were cross connected to floor locations on another punch down block that went to the floor locations. Now, whenever we wanted to make a connection live, we simply had to connect the correct CAT5 jumper wire from one punch down block to the other. You never touch the actual ports in the switch. They just stay where they are. All alterations are done on the punch down blocks. This keeps things nice and neat and there's no fiddling with cables in the switch area. Any time you need to put in a new blade, you just harness up 48 more cables (we called them pigtails) and put them in the new blade.
NOTE: You could do the exact same thing with patch panels instead of punch down blocks, but with higher densities, it's a bit easier to use the blocks and takes up much less space.
ADVANTAGES:
* Very neat cable design at the switch side.
* Never have to squeeze patch cables in and out.
* Easy to trace cables (but just better to document them and you'll never have to trace them).
* Makes moves, adds, and changes (particularly adds) very easy.
DISADVANTAGES:
* Not sure that you can do it with CAT6.
* You have to get a punch down tool and actually punch cables (not too bad though after you do a few).
* You need to make sure that you don't deprecate the rating on the cable by improperly terminating it (i.e. insufficient twists)
Anyway, I haven't had a need to do this in a while and I no longer work at the same place, but my biggest concern would be if that meets with the CAT6 spec. Not sure about that, but your cabling person could probably tell you.
I'm not a big fan of decentralizing the switches to remote locations. It can become cumbersome and difficult to manage if you end up with a lot of them. Also, it doesn't scale well and can end up with port waste (i.e. you have 24 servers in one cabinet on one switch and then along comes 25; you now have to buy another 12 or 24 port switch to service the need with either 11/23 ports going to waste -- not good).
Good luck. Let us know how you make out. I'd be glad to go in to more detail if the above isn't explained well enough.
Regards,
Dave

Performance tuning for data retrieval for PCL4 cluster

Hi all,
I am using PCL4 cluster to read history of employee data. The FM modules used are HR_INFOTYPE_LOG_GET_LIST and HR_INFOTYPE_LOG_GET_DETAIL .
Currently it is taking lot of time. Do we have any better methods.
Thanks in advance.
Regards,
tjgupta

Hi All,
I am also facing performance problem with PCL4 Audit cluster.
Please guide me how to do it in an efficient way.
I am using it is follows:
SELECT client relid srtfd srtf2 histo aedtm uname pgmid versn clustr INTO CORRESPONDING FIELDS OF TABLE it_pcl4
FROM pcl4 WHERE   relid EQ 'LA'
                  AND     srtf2 EQ '00'
                  AND     aedtm IN s_aedtm.
Where, s_aedtm-low = '20000101' & s_aedtm-high = '99991231'
Regards

Best Practice Question for Date Compares

Hello,
I'm far from an expert on Oracle and PL/SQL, so I may have this all wrong. I'm working on some selection scripts, and the guy that wrote these before me likes to convert parts of dates to numbers in order to do a compare. It seems to me a trunc(date, part) would be much more efficient. Can anyone confirm my thoughts here?
I'm seeing this a lot:
AND TO_NUMBER (TO_CHAR (scheduleddate, 'YYYY')) = TO_NUMBER (TO_CHAR (SYSDATE - 1, 'YYYY'))
Seems to me that I'd be better off just doing:
trunc(scheduleddate, 'YEAR') = trunc(SysDate, 'YEAR').
Does that make sense?
Thanks!
Chad

CSchrieber wrote:
Hello,
I'm far from an expert on Oracle and PL/SQL, so I may have this all wrong. I'm working on some selection scripts, and the guy that wrote these before me likes to convert parts of dates to numbers in order to do a compare. It seems to me a trunc(date, part) would be much more efficient. Can anyone confirm my thoughts here?
I'm seeing this a lot:
AND TO_NUMBER (TO_CHAR (scheduleddate, 'YYYY')) = TO_NUMBER (TO_CHAR (SYSDATE - 1, 'YYYY'))
Seems to me that I'd be better off just doing:
trunc(scheduleddate, 'YEAR') = trunc(SysDate, 'YEAR').
Does that make sense?
Thanks!
Chad
however , you might want to play around with it a bit to confirm you get the behavior you want in your context. I've not had much reason to use trunc, and in testing a few things just now to reply to admin1, I got some results that surprised me. Another little learning project for me now.
But I stand behind the essence of my original reply. The guy that wrote your original code was jumping through too many hoops (transform functions).

Performance Question for WL 5.1 on RedHat Linux 6.1

I'm currently evaluating WL 5.1 and installed it on linux.
I have installed the SUN JDK 1.2.2 for linux which should use
native threads.
When I start WL 5.1 I get the following message:
LD_LIBRARY_PATH=/usr/local/weblogic/weblogic/lib/linux:/usr/local/weblog
ic/weblogic/lib/linux
Warning: native threads are not supported in this release
What does this mean?
Also I get the following messages:
Fri Apr 07 08:59:38 CEST 2000:<A> <Posix Performance Pack> Could not
initialize POSIX Performance Pack.
Fri Apr 07 08:59:38 CEST 2000:<E> <Performance Pack> Unable to load
performance pack, using Java I/O.
How much does this impact the performance? Is it better to use NT instead
of linux?
thanks,
Alex

If you want to stick with Sun jdk, and don't want to see the error
messages, set weblogic.system.nativeIO.enable=false in
weblogic.properties. I wouldn't go to NT, because if you can afford it
Solaris on SPARC will be your fastest most reliable platform. We have
Solaris SPARC for production, and do our development on Lintel. For us
staying in a POSIX environment overall keeps things like startup,
environment setting, and make type scripts all on the same page.
Ian
Alexander Sommer wrote:
>
I'm currently evaluating WL 5.1 and installed it on linux.
I have installed the SUN JDK 1.2.2 for linux which should use
native threads.
When I start WL 5.1 I get the following message:
LD_LIBRARY_PATH=/usr/local/weblogic/weblogic/lib/linux:/usr/local/weblog
ic/weblogic/lib/linux
Warning: native threads are not supported in this release
What does this mean?
Also I get the following messages:
Fri Apr 07 08:59:38 CEST 2000:<A> <Posix Performance Pack> Could not
initialize POSIX Performance Pack.
Fri Apr 07 08:59:38 CEST 2000:<E> <Performance Pack> Unable to load
performance pack, using Java I/O.
How much does this impact the performance? Is it better to use NT instead
of linux?
thanks,
Alex--
Ian R. Brandt
Software Engineer
Genomics Collaborative, Inc.
99 Erie Street
Cambridge, MA 02139
(617)661-2400 Ext.244
(617)661-8899 FAX
[email protected]

Help ! for date column type

Hi,
I am having two tables tdz12 and tdf31. TDF31 is a date field. and TDZ12 is transactions history table. If I do
11:30:39 SQL> alter session set nls_date_format='DD-MON-RRRR HH24:MI:SS';
11:30:57 SQL> select c65201 from tdf31;
C65201
30-NOV-2006 00:00:00
11:46:48 SQL> select distinct a9000 from tdz12 where a9000 >= '01-NOV-06';
A9000
01-NOV-2006 00:00:00
02-NOV-2006 00:00:00
03-NOV-2006 00:00:00
04-NOV-2006 00:00:00
06-NOV-2006 00:00:00
07-NOV-2006 00:00:00
08-NOV-2006 00:00:00
09-NOV-2006 00:00:00
10-NOV-2006 00:00:00
11-NOV-2006 00:00:00
13-NOV-2006 00:00:00
14-NOV-2006 00:00:00
15-NOV-2006 00:00:00
16-NOV-2006 00:00:00
17-NOV-2006 00:00:00
18-NOV-2006 00:00:00
20-NOV-2006 00:00:00
21-NOV-2006 00:00:00
22-NOV-2006 00:00:00
23-NOV-2006 00:00:00
24-NOV-2006 00:00:00
25-NOV-2006 00:00:00
27-NOV-2006 00:00:00
28-NOV-2006 00:00:00
29-NOV-2006 00:00:00
30-NOV-2006 00:00:00
26 rows selected.
If I do
11:26:39 SQL> select sum(a9060)
11:27:52 2 from tdz12
11:27:52 3 where A9000>=(select to_date(to_char(C65201,'YYYYMM')||'01','YYYYMMDD') FROM TDF31);
SUM(A9060)
0
Why I am getting 0 records ? ( Pl tell me the reason, not alternate way to get records )
thanks & regards
PJP

TRUNC(c65201,'MONTH')is a simpler alternative to
TO_DATE(TO_CHAR(c65201,'YYYYMM')||'01','YYYYMMDD')although it will give the same result here.

One performance view for two classes, possible?

Hi there,
My system is still running 2007 R2. I am writing a MP now which contains two classes. There are few performance collection rules targeting those two classes. I want to create one performance view to display performance data for BOTH classes. Is it possible?
I already created an instance group and added both classes as member of the group. By using the group, I can created one alert view to display alerts from either class. Can I use the same trick for the performance view? Thanks!

In addition, we also can add a dashboard view with two columns for the two classes, and add performance widget for each column.
Regards,
Yan Li
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Performance question for date column

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