Gather_table_stats and AWR
Hi all,
i would like to disable automatic gathering of table statistics with dbms_scheduler.disable(name => 'SYS.GATHER_STATS_JOB'), because we like to gather statistics every time immediatly after we batch load our tables in our data warehouse. Is it right that this job is also needed for AWR and that oracle will not save system statistics once per hour if i disable this job?
Database version is 10gR2.
Thanks,
Robert
user1367414 wrote:
Hi all,
i would like to disable automatic gathering of table statistics with dbms_scheduler.disable(name => 'SYS.GATHER_STATS_JOB'), because we like to gather statistics every time immediatly after we batch load our tables in our data warehouse. Is it right that this job is also needed for AWR and that oracle will not save system statistics once per hour if i disable this job?
Database version is 10gR2.Robert,
the recommended way to disable automatic statistics collection on the non-Oracle objects in 10g is:
exec DBMS_STATS.SET_PARAM('AUTOSTATS_TARGET', 'ORACLE')
This way the job still gets executed but collects only statistics on the dictionary / AWR / etc. (owned by Oracle) tables. If you disable the job completely, your dictionary statistics might get outdated, potentially leading to suboptimal dictionary performance.
By the way:
"Oracle Database 10g uses a scheduled job, GATHER_STATS_JOB, to collect AWR statistics."This is a bit misleading, the job's purpose is to collect object statistics, as already mentioned the AWR snapshots are controlled differently (and by default are taken every hour, not only during the maintenance windows).
Another way you could handle your requirement would be to lock the statistics of the affected table or schemas by using DBMS_STATS.LOCK_TABLE/SCHEMA_STATS. This way these tables/schemas will be skipped by the default gathering job, and you need then to use the "FORCE=>true" parameter when gathering statistics individually. Note that there is one peculiarity with this approach: If you create/rebuild indexes on a table having the statistics locked, the default option "COMPUTE STATISTICS" of 10g doesn't apply any more, so it doesn't update the statistics of the index automatically in the dictionary, and there is unfortunately no "force" parameter available in the CREATE/ALTER INDEX command. You would need to either temporarily unlock the statistics or gather the index statistics separately (which means additional work for the database).
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/
Edited by: Randolf Geist on Jan 18, 2009 12:17 PM
Added note about lock statistics approach
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please give some details for health check of database.
thanks in advanceHi;
What is DB version?
Please check below doc:
http://download.oracle.com/docs/cd/B28359_01/server.111/b28275/tdppt_degrade.htm#CACGCJDC
Also see:
What is AWR( Automatic workload repository ) and How to generate the AWR report? [ID 748642.1]
How To Understand AWR Report / Statspack Report [ID 842884.1]
Regard
Helios -
ADDM and AWR report interpretation
Hi,
I have some confusion regarding the understanding of ADDM and AWR report.
I have created AWR reports for various period. All report indicated that all Instance efficiency checklists at their high 90s.
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Regards,
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Just a little detail to add to Dom's comments.
If you are convinced that you have lots of code that should be doing hard parsing, but the "soft parse ratio" looks wrong, then take a look in the statspack/AWR section labelled "SQL ordered by Parse Calls". You may find that some trivial, harmless looking piece of SQL has suffered a huge number of parse calls - and if so they will almost certainly have been "soft" parse calls and could therefore be hiding your expected "hard" parse figures.
Critical point: if you look at a ratio, you've hidden the underlying scale of any potential problem.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
To post code, statspack/AWR report, execution plans or trace files, start and end the section with the tag {noformat}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in fixed format.
"Science is more than a body of knowledge; it is a way of thinking"
Carl Sagan -
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For Windows:
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Like ASH means it will collect information about all the active database sessions like database user,
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AWR:-The Automatic Workload Repository (AWR) collects performance
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KIndly tell me exact difference in simple words.
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HTH
Aman.... -
Poorly Performing SQL Queries and AWR
version : 10.2.0.4 on OEL 5.
Snapshot duration is 30 mins. Its long, but sorry that is what is available right now.
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Query 1:
======
Plan Hash Total Elapsed 1st Capture Last Capture
# Value Time(ms) Executions Snap ID Snap ID
1 3714475000 113,449 9 60539 60540
-> % Total DB Time is the Elapsed Time of the SQL statement divided into the Total Database Time multiplied by 100
Stat Name Statement Per Execution % Snap
Elapsed Time (ms) 113,449 12,605.4 3.9
CPU Time (ms) 108,620 12,068.9 4.0
Executions 9 N/A N/A
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Disk Reads 0 0.0 0.0
Parse Calls 9 1.0 0.0
Rows 20 2.2 N/A
User I/O Wait Time (ms) 0 N/A N/A
Cluster Wait Time (ms) 0 N/A N/A
Application Wait Time (ms) 0 N/A N/A
Concurrency Wait Time (ms) 0 N/A N/A
Invalidations 0 N/A N/A
Version Count 2 N/A N/A
Sharable Mem(KB) 252 N/A N/AQuery 2:
======
Plan Hash Total Elapsed 1st Capture Last Capture
# Value Time(ms) Executions Snap ID Snap ID
1 4197000940 1,344,458 3 60539 60540
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Stat Name Statement Per Execution % Snap
Elapsed Time (ms) 1,344,458 448,152.7 46.5
CPU Time (ms) 1,353,670 451,223.3 49.7
Executions 3 N/A N/A
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Disk Reads 0 0.0 0.0
Parse Calls 3 1.0 0.0
Rows 48 16.0 N/A
User I/O Wait Time (ms) 0 N/A N/A
Cluster Wait Time (ms) 0 N/A N/A
Application Wait Time (ms) 0 N/A N/A
Concurrency Wait Time (ms) 0 N/A N/A
Invalidations 0 N/A N/A
Version Count 2 N/A N/A
Sharable Mem(KB) 270 N/A N/AQuery 3:
======
Plan Hash Total Elapsed 1st Capture Last Capture
# Value Time(ms) Executions Snap ID Snap ID
1 2000299266 104,060 7 60539 60540
-> % Total DB Time is the Elapsed Time of the SQL statement divided into the Total Database Time multiplied by 100
Stat Name Statement Per Execution % Snap
Elapsed Time (ms) 104,060 14,865.7 3.6
CPU Time (ms) 106,150 15,164.3 3.9
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Disk Reads 0 0.0 0.0
Parse Calls 7 1.0 0.0
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User I/O Wait Time (ms) 0 N/A N/A
Cluster Wait Time (ms) 0 N/A N/A
Application Wait Time (ms) 0 N/A N/A
Concurrency Wait Time (ms) 0 N/A N/A
Invalidations 0 N/A N/A
Version Count 2 N/A N/A
Sharable Mem(KB) 748 N/A N/AAny Ideas please as what is wrong with the above statistics? And what should I do next with it?
Thanks.Here is one of the plan for query:
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)|
Time |
| 0 | SELECT STATEMENT | | | | 9628 (100)|
|
| 1 | VIEW | | 73 | 58546 | 9628 (1)|
00:01:56 |
| 2 | WINDOW SORT PUSHED RANK | | 73 | 22630 | 9628 (1)|
00:01:56 |
| 3 | FILTER | | | | |
|
| 4 | NESTED LOOPS | | 73 | 22630 | 9627 (1)|
00:01:56 |
| 5 | NESTED LOOPS | | 73 | 20586 | 9554 (1)|
00:01:55 |
| 6 | NESTED LOOPS OUTER | | 72 | 15552 | 9482 (1)|
00:01:54 |
| 7 | NESTED LOOPS | | 72 | 13320 | 9410 (1)|
00:01:53 |
| 8 | NESTED LOOPS | | 72 | 12168 | 9338 (1)|
00:01:53 |
| 9 | NESTED LOOPS | | 4370 | 277K| 29 (0)|
00:00:01 |
| 10 | TABLE ACCESS BY INDEX ROWID| test_ORG | 1 | 34 | 2 (0)|
00:00:01 |
| 11 | INDEX UNIQUE SCAN | test_ORG_PK | 1 | | 1 (0)|
00:00:01 |
| 12 | TABLE ACCESS FULL | test_USER | 4370 | 132K| 27 (0)|
00:00:01 |
| 13 | TABLE ACCESS BY INDEX ROWID | REF_CLIENT_FOO_ACCT | 1 | 104 | 7 (0)|
00:00:01 |
| 14 | INDEX RANGE SCAN | RCFA_test_ORG_IDX | 165 | | 2 (0)|
00:00:01 |
| 15 | TABLE ACCESS BY INDEX ROWID | test_ACCOUNT | 1 | 16 | 1 (0)|
00:00:01 |
| 16 | INDEX UNIQUE SCAN | test_CUSTODY_ACCOUNT_PK | 1 | | 0 (0)|
|
| 17 | TABLE ACCESS BY INDEX ROWID | test_USER | 1 | 31 | 1 (0)|
00:00:01 |
| 18 | INDEX UNIQUE SCAN | test_USER_PK_IDX | 1 | | 0 (0)|
|
| 19 | TABLE ACCESS BY INDEX ROWID | REF_FOO | 1 | 66 | 1 (0)|
00:00:01 |
| 20 | INDEX UNIQUE SCAN | REF_FOO_PK | 1 | | 0 (0)|
|
| 21 | TABLE ACCESS BY INDEX ROWID | REF_FOO_FAMILY | 1 | 28 | 1 (0)|
00:00:01 |
PLAN_TABLE_OUTPUT
| 22 | INDEX UNIQUE SCAN | REF_FOO_FAMILY_PK | 1 | | 0 (0)|
|
40 rows selected.
SQL> -
Oracle 9.2.0.8 and AWR report?
Does anyone know if 9.2.0.8 supports AWR?
Thanks in advance!Thanks! I figured it may since I have also seen that it now support Automatic Memory Management, which was also introduced in 10g v1.
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I could not get right information googling out.
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Kev -
Enterprise manager ADDM and AWR
I'm currently using Oracle Database 10g Enterprise Edition Release 10.2.0.1.0
What is the licensing concept of AWR?
Is that built-in by default to the above release or does it requrie any pricing?
I would like to use the ADDM feature for monitoring performance of the project
that is in development.AFAIK one can not use ASH/AWR/ADDM views without at least buying the Diagnostic pack (it seems that those features are part of this pack).
Of course it is ridiculous that one can not disable those mechanisms even if one can not use them (it is ppossible in 11g), but that is the Oracle licensing ... -
Object name, segment advisor and db sequential read
oracle 10.2.0.4:
I am looking at our ADDM and AWR report. It's complaining about db file sequential read waits and also "Segment Advisor" on LOB SYS_LOB.... I have couple of questions:
1. When select is fired (from JDBC/hibernate) with the column that is of type BLOB does the blob gets extracted at that point or just the reference is returned to the BLOB. And only when that column is accessed then the blob is fetched. Or does it get fetched right away in the "Select statemement"?
2. I see Sedgment Advisor on object name LOB SYS_LOB000000012511C000006$$. How do I know which column/table it's referring to.
3. db file sequential read waits means that something is wrong with disk layout?
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-
Hi All,
I want to automate for awr report generating for every 30 min. For this I am creating a script which is not working properly. Script given below.
1. Declaring an variable
2. Giving value to the variable by running sql query
3. Executing dbms_workload_repository procedure.
Please help me proper steps.
SET SERVEROUTPUT ON
Declare
DBID_NUM NUMBER;
INST_NUMBER NUMBER;
MAX_SNAP_ID NUMBER;
MIN_SNAP_ID NUMBER;
DBID_NUM := select DBID into DBID_NUM from dba_hist_snapshot WHERE ROWNUM=1;
INS_NUMBER := select INSTANCE_NUMBER into INST_NUMBER from dba_hist_snapshot WHERE ROWNUM=1;
MAX_SNAP_ID := select MAX(SNAP_ID) into MAX_SNAP_ID from dba_hist_snapshot;
MIN_SNAP_ID =: select MAX(SNAP_ID)-1 into MIN_SNAP_ID from dba_hist_snapshot;
Begin
SELECT output FROM TABLE (dbms_workload_repository.awr_report_html(DBID_NUM,INST_NUMBER,MAX_SNAP_ID,MIN_SNAP_ID));
End;
/Hi,
I am trying to help, however it's hard because you haven't clarified your end goal. What time period do you need to generate the AWR report for? Generating an AWR report from the entire range of available snap_id's is utterly useless. It's like measuring your average body temperature from the moment of birth up to now.
How are you planning to generate it -- into a database table, into a file, to terminal output? You didn't mention that and it's impossible to deduce it from your script.
Most importantly, why do you need to produce all these AWR reports for each 30 mins? Every 30 days, I would understand, but every 30 mins?! Do you realize that if you want to look at some trends, it much easier to do that using AWR views directly, rather than trying to extract data from html codes? And if you want your performance history just in case -- why don't you increase your SYSAUX tablespace and AWR retention, so that you can go back and generate a retrospective AWR report when needed?
I wrote an anonymous to autogenerate an AWR report for the last snapshot and dump it to the screen, hope this helps:
declare
l_dbid number;
l_inst_id number;
l_last_snap_id number;
l_output clob;
begin
select dbid into l_dbid from v$database;
select instance_number into l_inst_id from v$instance;
select max(snap_id) into l_last_snap_id from dba_hist_snapshot;
for rec in (select * from table(dbms_workload_repository.awr_report_text(l_dbid,l_inst_id, l_last_snap_id - 1, l_last_snap_id))) loop
dbms_output.put_line(rec.output);
end loop;
end;
/Best regards,
Nikolay
P.S. You have 17 out of 21 questions unresolved. Has the forum been really this unhelpful for you? -
How to retrieve 'top 5 timed events' from AWR
Hello,
I have a 10g database and awr is running every hour. How do I get the 'Top 5 Timed Events' from the awr report for every single hour on the last five days worth of awr reports? I can see the awr reports through GRID but where is the actual location of the snapshots? Instead of getting this information from awr reports, can I get 'Top 5 timed events' from the data dictionary for every hour for the last five days? Thank you in advance.watson2000 wrote:
Hello,
I have a 10g database and awr is running every hour. How do I get the 'Top 5 Timed Events' from the awr report for every single hour on the last five days worth of awr reports? I can see the awr reports through GRID but where is the actual location of the snapshots? Instead of getting this information from awr reports, can I get 'Top 5 timed events' from the data dictionary for every hour for the last five days? The "Top 5" comes from combining information about system events and the time model statistics. The information is stored in a number of tables in the SYS schema with names starting with WRH$, but also exposed in a set of views starting with DBA_HIST.
To reconstruct the Top 5 hourly for the last five days, you will need to access DBA_HIST_SYSTEM_EVENTS (system events) DBA_HIST_SYS_TIME_MODEL (time model) and DBA_HIST_SNAPSHOT (list of snapshot ids and times).
It won't be a trivial query, as you need to collect the "DB CPU" entry from dba_hist_system_time_model, union it with the dba_hist_system_events, then take the top 5 for each snapshot from the result. You'll probably need to look at subquery factoring and analytic functions to make this as efficient as possible.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"Science is more than a body of knowledge; it is a way of thinking"
Carl Sagan
To post code, statspack/AWR report, execution plans or trace files, start and end the section with the tag {noformat}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in fixed format.
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