Suggested schedule for gather statistics on sysadm

We have recently upgraded to 11.1.0.7 with psoft version 9.0 and tools 8.49 on sun solaris version 10. Currently we are running stats every night on all non work sysadm tables. I'm wondering if this is too much. We are seeing sql statements use different explain plans. For ex: one sql takes plan A and finishes in expected time. At some other point during the week that same sql will take plan B and will either never finish or take way too long.
So I'm curious to see how other folks are handling their statistics.
Other items of note:
we disabled the nightly oracle statistics job
our database is about 200 GB of used space
In any feedback is much appreciated.

Welcome to the forum!
Whenever you post provide your 4 digit Oracle version (result of SELECT * FROM V$VERSION)
>
For example there is a table T1 with 25GB size (3 crores rows) and partitioned when i try generating statistics for a T1 table with below command it takes lots of time and i dont know what is the progress.
>
Your command will generate statistics for the entire table; that is, ALL partitions. Is that what you intended?
Sometimes partitioned tables have historical data in older partitions and a small number of ACTIVE partitions where the amount of data changes substantially. You could collect stats only on the partitions that have large data changes. The older, static partitions may not need frequent stat collections since the amount of data that changes is small.
If you are using 11g you could collect incremental statistics instead of global stats. Here is an article by Maria Colgan, an Oracle developer on the Optimizer team on stats.
https://blogs.oracle.com/optimizer/entry/how_do_i_compare_statistics

Similar Messages

How to reduce time for gather statistics for a table.

I have a table size 520 gb
Its one of the partition size is 38 gb
and total indexes of related table is 412 gb.
Server/instance details.
==========
56 cpu -> Hyper threading enable
280 gb ram
35 gb sga
27 gb buffer cache
4.5 gb shared pool size
25 gb pga
undo size 90gb
temp size 150 gb
Details :
exec dbms_stats.gather_table_stats('OWNER','TAB_NAME',PARTNAME=>'PART_NAME',CASCADE=>FALSE,ESTIMATE_PERCENT=>10,DEGREE=>30,NO_INVALIDATE=>TRUE);
when i am firing this in an ideal time when there is no load that time also is is taking 28 mins to complete.
Can anybody please reply me how can we reduce the stats gather time.
Thanks in advance,
Tapas Karmakar
Oracle DBA.

Enable tracing to see where the time is going.
parallel 30 seems optimistic - unless you have a large number of discs to support the I/O ?
you haven't limited histogram collection, and most of the time spent of histograms may be wasted time - what histograms do you really need, and how many does Oracle analyse for and then discard ?
Using a block sample may help slightly
You haven't limited the granularity of the stats collection to the partition - the default is partition plus table, so I think you're also doing a massive sample on the table after completing the partition. Is this what you want to do, or do you have an alternative strategy for generating table-level stats.
Regards
Jonathan Lewis

How to gather statistics

Hi folks!
I gathered statistcs in one schema with folowing options:
exec dbms_stats.gather_schema_stats(user,method_opt=>'FOR ALL COLUMNS SIZE 1',estimate_percent=>null,gather_temp=>false,cascade=>true,degree=>dbms_stats.auto_degree);Then:
exec dbms_stats.gather_schema_stats(user,method_opt=>'FOR ALL COLUMNS SIZE SKEWONLY',estimate_percent=>null,gather_temp=>false,cascade=>true,degree=>dbms_stats.auto_degree);Now, I turn on table monitoring and suggest to gather statistics (per day) with that parameters:
dbms_stats.gather_schema_stats(ownname =>user, options=>'GATHER STALE', gather_temp => false, cascade => true, estimate_percent => 100, degree => dbms_stats.auto_degree);Default method_opt is FOR ALL COLUMNS SIZE AUTO.
Now I got better perfomance. How often I need to gather statstics?
Thanks in advance.
Best regards, Pavel.

Thanks, I also think so.
Little test-case:
SQL>exec dbms_stats.gather_table_stats(user,'TABLE1',estimate_percent=>null);
Elapsed: 00:00:01.03
SQL> select column_name,num_distinct,sample_size from user_tab_col_statistics where table_name='TABLE1;
COLUMN_NAME                                                                                NUM_DISTINCT SAMPLE_SIZE
DISGRP                                                                                             7944        33204
DISMBR                                                                                            18948        33204
TYPE                                                                                                  4        33204
Elapsed: 00:00:00.03
SQL> exec dbms_stats.gather_table_stats(user,'TABLE1',estimate_percent=>10);
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.78
SQL> select column_name,num_distinct,sample_size from user_tab_col_statistics where table_name='TABLE1';
COLUMN_NAME                                                                                NUM_DISTINCT SAMPLE_SIZE
DISGRP                                                                                             3836         3269
DISMBR                                                                                            13686         3269
TYPE                                                                                                  4         3269
Elapsed: 00:00:00.00
SQL> exec dbms_stats.gather_table_stats(user,'TABLE1',estimate_percent=>100);
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.52
SQL> select column_name,num_distinct,sample_size from user_tab_col_statistics where table_name='TABLE1';
COLUMN_NAME                                                                                NUM_DISTINCT SAMPLE_SIZE
DISGRP                                                                                             7944        33204
DISMBR                                                                                            18948        33204
TYPE                                                                                                  4        33204
Elapsed: 00:00:00.01
SQL> exec dbms_stats.gather_table_stats(user,'TABLE1',estimate_percent=>dbms_stats.auto_sample_size);
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.53
SQL> select column_name,num_distinct,sample_size from user_tab_col_statistics where table_name='TABLE1';
COLUMN_NAME                                                                                NUM_DISTINCT SAMPLE_SIZE
DISGRP                                                                                             8448         5568
DISMBR                                                                                            18948        33204
TYPE                                                                                                  4         5568
Elapsed: 00:00:00.00
SQL> select count(distinct disgrp) from TABLE1;
COUNT(DISTINCTDISGRP)
                 7944
Elapsed: 00:00:00.02
SQL> select count(distinct dismbr) from TABLE1;
COUNT(DISTINCTDISMBR)
                18948
Elapsed: 00:00:00.03
SQL> select count(distinct type) from TABLE1;
COUNT(DISTINCTTYPE)
                  4
Elapsed: 00:00:00.01
SQL> select column_name,num_distinct,sample_size from user_tab_col_statistics where table_name='TABLE2';
COLUMN_NAME                                                                                NUM_DISTINCT SAMPLE_SIZE
ID                                                                                               219120       219120
UNIT                                                                                             114762       219120
LOC                                                                                                  61       219120
TIS                                                                                                1230       219120
RTYP                                                                                                  3       219120
Elapsed: 00:00:00.02
SQL> exec dbms_stats.gather_table_stats(user,'TABLE2',estimate_percent=>null);
PL/SQL procedure successfully completed.
Elapsed: 00:00:07.61
SQL> select column_name,num_distinct,sample_size from user_tab_col_statistics where table_name='TABLE2';
COLUMN_NAME                                                                                NUM_DISTINCT SAMPLE_SIZE
ID                                                                                               219120       219120
UNIT                                                                                             114762       219120
LOC                                                                                                  61       219120
TIS                                                                                                1230       219120
RTYP                                                                                                  3       219120
Elapsed: 00:00:00.00
SQL> exec dbms_stats.gather_table_stats(user,'TABLE2',estimate_percent=>10);
PL/SQL procedure successfully completed.
Elapsed: 00:00:02.90
SQL> select column_name,num_distinct,sample_size from user_tab_col_statistics where table_name='TABLE2';
COLUMN_NAME                                                                                NUM_DISTINCT SAMPLE_SIZE
ID                                                                                               219950        21995
UNIT                                                                                              70812        21995
LOC                                                                                                  43        21995
TIS                                                                                                 496        21995
RTYP                                                                                                  3        21995
Elapsed: 00:00:00.00
SQL> exec dbms_stats.gather_table_stats(user,'TABLE2',estimate_percent=>50);
PL/SQL procedure successfully completed.
Elapsed: 00:00:03.70
SQL> select column_name,num_distinct,sample_size from user_tab_col_statistics where table_name='TABLE2';
COLUMN_NAME                                                                                NUM_DISTINCT SAMPLE_SIZE
ID                                                                                               218716       109358
UNIT                                                                                              92338       109426
LOC                                                                                                  61       109455
TIS                                                                                                 994       109567
RTYP                                                                                                  3       109422
Elapsed: 00:00:00.00
SQL> exec dbms_stats.gather_table_stats(user,'COMPS',estimate_percent=>100);
PL/SQL procedure successfully completed.
Elapsed: 00:00:04.37
SQL> select column_name,num_distinct,sample_size from user_tab_col_statistics where table_name='TABLE2';
COLUMN_NAME                                                                                NUM_DISTINCT SAMPLE_SIZE
ID                                                                                               219120       219120
UNIT                                                                                             114762       219120
LOC                                                                                                  61       219120
TIS                                                                                                1230       219120
RTYP                                                                                                  3       219120
Elapsed: 00:00:00.00
SQL> exec dbms_stats.gather_table_stats(user,'COMPS',estimate_percent=>dbms_stats.auto_sample_size);
PL/SQL procedure successfully completed.
Elapsed: 00:00:03.81
SQL> select column_name,num_distinct,sample_size from user_tab_col_statistics where table_name='TABLE2';
COLUMN_NAME                                                                                NUM_DISTINCT SAMPLE_SIZE
ID                                                                                               217968        54492
UNIT                                                                                             122237        54492
LOC                                                                                                  31         5495
TIS                                                                                                 240         5495
RTYP                                                                                                  3         5495
Elapsed: 00:00:00.01
SQL> select count(distinct id) from TABLE2;
COUNT(DISTINCTID)
           219120
Elapsed: 00:00:00.27
SQL> select count(distinct unit) from TABLE2;
COUNT(DISTINCTUNIT)
             114762
Elapsed: 00:00:00.30
SQL> select count(distinct loc) from TABLE2;
COUNT(DISTINCTLOC)
                61
Elapsed: 00:00:00.06
SQL> select count(distinct tis) from TABLE2;
COUNT(DISTINCTTIS)
              1230
Elapsed: 00:00:00.09In that situation, auto_sample_size not bad? But estimate_percent=>100 - exact.
Best regards, Pavel.

Needed Script for Gather Schema Stats

Hi
Well i need a script that monitors Gather Schema Schema stats is scheduled for coming week
In EBS this would be a con current request scheduled that i need to get the information ..
that script will run once in week and tell us that a GSS is scheduled on or else if its not scheduled it will give an alert as it is not schedule
please let me know
Cheers

Hi Hussein,Alex
well thanks for your reply ....
but let me be more more clear what i need ...
below query
select ACTUAL_START_DATE, ACTUAL_COMPLETION_DATE,ROUND ( (ACTUAL_COMPLETION_DATE - ACTUAL_START_DATE)*1440) DURATION_MINS, REQUEST_ID, CONCURRENT_PROGRAM_ID from fnd_concurrent_requests where actual_start_date between to_date('4-Jun-12 00:00:00','dd-mon-yy hh24:mi:ss') and to_date('6-July-12 11:00:00','dd-mon-yy hh24:mi:ss')
and CONCURRENT_PROGRAM_ID in (select CONCURRENT_PROGRAM_ID from FND_CONCURRENT_PROGRAMS_TL where USER_CONCURRENT_PROGRAM_NAME LIKE 'Gather Schema Statistics') order by 5,1;
this give me output that between this date 4-june-12 to 6-July-12 is there any con current request ran for Gather Schema Stats...
this query will give me request_id,concurrent_program_id and all details...
like this i want to see that if any con current request is schedule in near future
let us for eg
this script will run on monday and it will pickup up the concurrent request telling for this week on this date GSS is schedule...
likewise i need ...
hope this give explanation what exact i need ..
Cheers........

How I gather statistics via OEM db control?

Hi,
According to the documentation,
I may setup a job to automatically
gather statistics for all the segments in my database
via EM database control.
I cant find any documentation on how to do this.
I did find a link in EM which will allow me
to gather statistics ad hoc but I want it automated.
Thanks,
-moi

There should be a stats gathering program scheduled
by default. Check under Database > Administration >
Scheduler > Jobs in Database Control. The job is called
SYS.GATHER_STATS_JOB. You will need to login as SYS to
see the job. The job runs the
DBMS_STATS.GATHER_DATABASE_STATS_JOB_PROC procedure.
You can, of course, schedule any other
DBMS_STATS.GATHER_* procedures if you prefer.
Hope this helps.
Kailash.

Open Order scheduled for delivery

Hi there ,
Please suggest me the report to spool the Open Order scheduled for delivery for a material ....
Regards
Kaushik

Hi
Check the delivery due list, its shows open orders due for delivery for a particular date
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Anurag

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regards
Durga Ram

Hi
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Thanks

MRP-Delivery Schedule for Sales order is not updating in Production order

Dear Experts,
I have created Sales order and maintained delivery scheduling, Then Run MRP through MD50,
We received Planned order then through this we have converted to Prodcution order.
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I am able to see Sales order and Line item but i am not abel to get any delivery schedule line item.
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Don

Dear Experts,
Please provide me solution.
after Running MD50 transaction against Sales order.
If I maintained different Scheduling Line Item for First Line item of Sales order.
The Respective Scheduling Lines should update against Each Production order which has converted from Planned order.
Thanks in advance.
Regards
DON

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I have a scenario where we does STO and then delivery against outbound and performs goods receipt. in MMBE the stock is still displaying under schedule for delivery and also in MD04 even the stock is deducted from supplying plant and performed goods receipt at receiving plant..also stock is displaying at receiving plant..why the stock is still displaying in stock for del at sending plant..in general what happens when we does goods receipt against outbound delivery or when we does against STO?

ok sir ;
No i don't talke abouat STP i don't have any transit stock it's a simpl sales based on global purchas
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Sending SOAP request from XI and writing a scheduler for this

Dear XI Experts,
My scenario is as follows.
We have two landscapes
1)     XI, R/3
2)     Client System(Remote, Other than SAP)
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Ur Suggestion
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Best practices for gathering statistics in 10g

I would like to get some opinions on what is considered best practice for gathering statistics in 10g. I know that 10g has auto statistics gathering, but that doesn't seem to be very effective as I see some table stats are way out of date.
I have recommended that we have at least a weekly job that generates stats for our schema using DBMS_STATS (DBMS_STATS.gather_schema_stats). Is this the right approach to generate object stats for a schema and keep it up to date? Are index stats included in that using CASCADE?
Is it also necessary to gather system stats? I welcome any thoughts anyone might have. Thanks.

Hi,
Is this the right approach to generate object stats for a schema and keep it up to date? The choices of executions plans made by the CBO are only as good as the statistics available to it. The old-fashioned analyze table and dbms_utility methods for generating CBO statistics are obsolete and somewhat dangerous to SQL performance. As we may know, the CBO uses object statistics to choose the best execution plan for all SQL statements.
I spoke with Andrew Holsworth of Oracle Corp SQL Tuning group, and he says that Oracle recommends taking a single, deep sample and keep it, only re-analyzing when there is a chance that would make a difference in execution plans (not the default 20% re-analyze threshold).
I have my detailed notes here:
http://www.dba-oracle.com/art_otn_cbo.htm
As to system stats, oh yes!
By measuring the relative costs of sequential vs. scattered I/O, the CBO can make better decisons. Here are the data items collected by dbms_stats.gather_system_stats:
No Workload (NW) stats:
CPUSPEEDNW - CPU speed
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IOTFRSPEED - I/O transfer speed in milliseconds
I have my notes here:
http://www.dba-oracle.com/t_dbms_stats_gather_system_stats.htm
Hope this helps. . . .
Don Burleson
Oracle Press author
Author of “Oracle Tuning: The Definitive Reference”
http://www.dba-oracle.com/bp/s_oracle_tuning_book.htm

Scheduled for delivery quantity shouldnt be transffered to another plant

dear all,
we have a case in which we need to prevent scheduled for delivery quantity from being transferred to another plant.
the problem is that when creating a sales order and a delivery, and before the PGI,, the system allows moving the quantitity to another plant. and this causes a problem when trying to create a PGI ...
any suggestions please

in the checking rule ( if stk transfer, you can get it from OLME> purchase order > create stock transport order ) incude reservations, deliveriies and sales order.
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How to Gather Statistics of Tables and Indexes

Hi all,
Plz help me in Gathering Statistics of Tables and Indexes.
Thanks

for tables
exec dbms_stats.gather_table_stats('SCOTT', 'EMPLOYEES');
for indexes
exec dbms_stats.gather_index_stats('SCOTT', 'EMPLOYEES_PK');
check this link for detail
http://nimishgarg.blogspot.com/2010/04/oracle-dbmsstats-gather-statistics-of.html

Drop down in the Input Schedule for Dimension

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Thanks
Viv

Hi Shoba
Thanks for your reply.
See if we can use EVMBR function, which will Pop up the screen same as when we click the CV only thing is that the Current View will not change.
We can also use EVCVW is a particular cell same as the way EVMBR, but when we use this EVCVW, the Currrent View will also change fine
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I am trying the EVLST, but efforts are in vain.
Looking forward
Reg
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Exclude Schema from Gather Statistics Job

I am using 11.1.0,7. I would like to know if we can exclude some schemas While Oracle automatically gathers the statistics.
Reason I want this is that, I have one database that supports multiple applications but as per one application's demand we should not be gathering stats on it's schema. So, in totality I have 20 Schemas but while this jobs run, I want to exclude 2 schemas that this application supports.
Locking the Stats for these schemas is not an option.
Thanks!

Have you enquired from the vendor exactly why they do not want you to gather statistics on it's schema?
Is there other options they are willing to consider like baselining the explain plan or perhaps not publishing the statistics to the tables...using the pending statistics feature?
Exec dbms_stats.set_table_prefs('SH', 'CUSTOMERS', 'PUBLISH', 'false');
Regards
Tim Boles
Edited by: Tim Boles on Aug 4, 2010 11:11 AM

Suggested schedule for gather statistics on sysadm

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