Server Administration :: Collect Object Stats - When Enough Of Data Has Changed
Aug 29, 2013
Quote:Oracle collects new statistics when enough of the data (about 10%) has changed.I read the above statement in the oracle documentation that Oracle collects new statistics when enough of the data (about 10%) has changed every day during 10 pm to 6am .
But still i see some object statistics are stale and empty.Do i need to collect statistics for these objects manually ? and would like to know why these objects statistics were not collected during maintenance window ?
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Oct 10, 2013
We are running 11g (11.2.0.3)We have a "working table" that is empty at the beginning of the day.Then we start adding rows (insert) with a key column called STATE with a value of 100.At the same time, there are other apps that pickup data in state 100 , process that data and change that state to 200 or 300.There is also another app that pickup data in state 200 , process that data and change that state to 300 or 400.
So in summary, the data on that table is at the beginning empty, then all the rows are in state 100, they slowly move to different states (200, 300, etc) and by the end of the day, they are all in 400.
My question is what would be the best way to collect stats on this table?
I was thinking to create an hourly job to collect stats on that table:
exec dbms_stats.gather_table_stats (
ownname => 'SCOTT',
tabname => 'WORK_T
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Sep 11, 2012
During STATS gather running for the table, unknowingly i deleted the old stats using EXEC DBMS_STATS.DELETE_TABLE_STATS. I would like to know will it affect the stats gather job currently running for the table and whether my stats will be gathered successfully.
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Nov 12, 2012
Procedures, triggers and other object with character changed.
Every character was replaced by ã? the content of procedures and other objects after importing a schema for production approval.
Example:
EXCEPTION
WHEN OTHERS THEN
p_msgerro := p_msgerro ||
' Erro na selec?o da Unidade Administrativa. ' ||
The character (?) deveria ser (ã)
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Aug 6, 2012
Our UNDO space remains at a high level 85 to 95 percent. We keep adding database files and it doesn't seem to go down significantly. When we do a backup of the system where we shut the database down, it does go down some but then within a week or so it is back up again.
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Jun 4, 2010
attached query giving consistent execution plan but different timings across run
SELECT /*+ INDEX (CRT CRT_CUN_FK_I)*/
DISTINCT odr.dve_id
FROM company_requirements crt, orders odr, lelo_products la_pct
WHERE crt.qtn_cun_id = 10035637--10000021--10035667
AND crt.ID = odr.crt_id_quote_implemented
AND NVL (odr.cancellation_date, '31-Dec-9999') = '31-Dec-9999'
[code]....
we have 4 databases, 2 on each servers, such that db1 and db2 on server1 and db3 and db4 on server2
refer count of the records for column of biggest table in the query, taken on all 4 databases (The column is nullable)
select count(*) from company_requirements crt WHERE crt.qtn_cun_id = 10035637
db1 = 73335
db2 = 89073
db3 = 81182
db4 = 82936
First I executed the query on db1 and db2 while there wasn't any user logged on to the system
db1
**********
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.06 0.08 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 1 17.47 473.39 85704 1508102 0 0
[code]...
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 1 0.00 0.00
db file sequential read 85704 0.31 460.55
latch free 1 0.00 0.00
SQL*Net message from client 1 14.98 14.98
[code]...
Why the elasped time changed when data and plan hasn't changed at all? Also why the plan has different stats for round 1 and 2 on db1 and db2?
I ran it 2 times each round each database so hard parsing shall not be issue.Also why the number of rows accessed are different in db1,db2 and db3,db4 especially for step1 when count of crt.qtn_cun_id is similar?
In fact when the query was taking long I was the only user on the system Also I used hard coded value (no bind variables at all)
I checked num_rows, distinct keys as well which are quite similar across all 4 databases Also no stats where gather during the query execution
What I should have checked or monitored?
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Dec 20, 2011
I've just installed an Oracle 11.2.0.1.0 64 bit server on my windows 7 machine in order to play around while using attempting to run
exec dbms_stats.gather_table_stats('eii','v2x4e')
I get the following:
ORA-20000: Unable to analyze TABLE "EII"."V2X4E", insufficient privileges or does not exist
ORA-06512: at "SYS.DBMS_STATS", line 20327
ORA-06512: at "SYS.DBMS_STATS", line 20360
ORA-06512: at line 1
My initial google searches indicate that I need the select any table and analyze any privileges. I don't think that can be right/appropriate - but I've granted them anyway to no avail.
Select * from user_tables
returns tables in the System and sysaux tablespaces, but not my own schema/tablespace?
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May 27, 2012
what privilege is required to run dbms_stats package for gathering table and schema statistics.
SQL> show user
USER is "JACK"
SQL>
SQL> select * from user_sys_privs;
no rows selected
SQL> select * from user_role_privs;
no rows selected
SQL> select * from role_sys_privs;
no rows selected
SQL> exec dbms_stats.gather_table_stats('JACK','EN1')
PL/SQL procedure successfully completed.
I revoke all the privileges from JACK user but still i am able to gather stats for a table.what privilege is require to gather stats.
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Mar 22, 2012
When we want to gather schema statistics which method we should follow and why ?
exec dbms_utility.compile_schema('SHIKHAR');
or
BEGIN
SYS.DBMS_STATS.GATHER_SCHEMA_STATS (
OwnName => 'JACK'
[Code].....
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Sep 11, 2007
I've got to collect statistics by DBMS_STAT. For the first time, the spcreate.sql is to be called, however, it returned one error following:
If this script is automatically called from spcreate (which is the supported method), all STATSPACK segments will be created in the PERFSTAT user's default tablespace.
Using perfstat tablespace to store Statspack objects
... Creating STATS$SNAPSHOT_ID Sequence Sequence created.
create public synonym STATS$SNAPSHOT_ID for STATS$SNAPSHOT_ID
*
ERROR at line 1:
ORA-00955: name is already used by an existing object Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production With the Partitioning, OLAP and Data Mining options
And then, I checked it again with its owner:
SQL> select owner, synonym_name
2 from dba_synonyms
3 where synonym_name='STATS$SNAPSHOT_ID';
OWNER SYNONYM_NAME
------------------------------ ------------------------------
PUBLIC STATS$SNAPSHOT_ID
Then, I checked again after dropping schema PERFSTAT:
SQL> conn /as sysdba
Connected.
SQL>
SQL> select username, account_status
[code]...
What's the STATS@SNAPSHOT_ID synonym? Can I remove it from PUBLIC owner and recreate?
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Apr 17, 2013
I am having few confusion on dbname, sid & tnsname.
rman target sys/oracle@suman auxiliary /
In the above command, "suman" is SID or Tnsname or dbname?
Bimistake, in my test database, i tried to change the DBname to suman from sumandb in pfile. After changing, i tried to startup database in nomount pfile but oracle through error that, unable to locate control file. Then, i remove the control files and tried to start database with nomount. Oracle through error about the control file.
This database, i had installed through DBCA. I want to know, where are all places where DBname reside?
Can i start database through pfile even if it is created through DBCA?
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Apr 29, 2012
which initializaion parameter cant be change after creating the database?
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Mar 21, 2012
I got query to investigate, how table owner is changed.
SQL> conn test/test
Connected.
SQL> create table guri(name varchar2(9));
Table created.
SQL> select table_name from user_tables;
no rows selected
SQL> conn /as sysdba
Connected.
SQL> select owner,object_name,object_type from dba_objects where object_name = 'GURI';
OWNER OBJECT_NAME OBJECT_TYPE
---------- ----------- ------------
CISREPLICA GURI TABLE
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Feb 18, 2010
Here is an article to show a case when SYS password is changed by SYSTEM:
[URL]....
This behavior is not working on all the environments.
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Sep 11, 2012
Using below script i run stats gather job..But LAST_ANALYZED column is not updated for the table.. Why it was not updated.. My DB version is 11.1.0.7.0
exec DBMS_STATS.GATHER_TABLE_STATS(ownname => 'XXXX', tabname => 'XXXXXX',estimate_percent =>5, method_opt => 'FOR ALL INDEXED COLUMNS SIZE AUTO', degree => 8, granularity => 'ALL',Cascade => TRUE);
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Apr 1, 2011
I have database A (Working in Live environment) and Database B copy of Database (Not live) I have Restored whole database (A) RMAN backup file on Database (B) Previous week now i don't want to change anything in any schema and want to import only updated and new records in the table in Database B
There are around 20 schema If for example i have everything in new database B all required database objects like Procedure,functions, packages with indexes in all tables and data in tables, i just want to add new data and updated data.
IF i do following in source database
expdp directory=dpump_dir dumpfile=table_data.dmp content=data_only schemas=ACCMAIN,HRMAIN,..... include=TABLE
AND Import in destination database B, will it add new data and update existing one in table and not touch the table structure and indexes.
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Dec 26, 2012
Are the terms object and segment same ? what are the differences between them? what are similarities between them?
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Apr 2, 2013
My job is running at 2 am and that time no application user is connected. Even though, my exp utility shows error on 3 tables (2 are temp tables), everyday. But when expdp is running without error, which was scheduled at 4 am.
Below are the error -
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options Export done in WE8MSWIN1252 character set and AL16UTF16 NCHAR character set
. . exporting table DW_TEST_MOTOR
EXP-00056: ORACLE error 1466 encountered
ORA-01466: unable to read data - table definition has changed
[Code].....
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Jul 6, 2013
My Oracle db have this tablespace named INDX which is 80% full. I tried to query on the table, user using it but there is no one using this tablespace
May I know if there is a query that i can used to find out which dba_object is consuming the 80% of this tablespace.
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Jul 15, 2010
Whenever I create a table using login A, the table gets created successfully. But when I query the dba_objects, the object owner is different, login B. What might be the reason behind this?
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May 3, 2010
We had a new outsourcer who completed migration of 1 of our system running under Oracle10g-Solaris 10. We created an inventory script that will list all objects counts of SYS, SYSTEM and ORACLE and all other schemas. This script will be ran before (old server) and after migration (to new server). After migration to the new & bigger server, we noticed from the output of the inventory script for SYS/SYSTEM object counts had been reduced compared from the original/actual value (from the old server). Our outsourcer said that this is not an issue since SYS/SYSTEM objects are not transactional and cannot be controlled.
As we will conform that the migration was completed successfully by our new outsourcer.
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Mar 6, 2011
I have create one table emp under scott schema, and this schemas default tablespace is USERS and this tablespace has 3 datafiles.
Now how do I identify the object EMP is residing on which datafile in USERS tablespace?
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May 25, 2011
When i try to compile a package, im getting below error.
ERROR at line 1:ORA-04021: timeout occurred while waiting to lock object
i gave below query and found the sid of object.
select * from v$access where object='THINKING_PKG'
From v$session view,i found sid and serial# and at same time i queried dba_jobs and saw one jobs is running at this time.Now how to compile this object.
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Jan 27, 2011
DBMS_STATS.CREATE_STATS_TABLE
DBMS_STATS.EXPORT_SCHEMA_STATS
DBMS_STATS.GATHER_TABLE_STATS
I have used the above to get a copy of schema stats and gather new stats for specific tables into a STATS TABLE in my personal schema. What I want to do now is use this stats table to generate plans for queries where I believe stats are off. Is it even possible? To be clear, I do not want to import stats because this replaces the stats currently there. I just want to point the CBO to my stats table for generating plans.
there was a session parameter I could set to tell oracle to use my stats table when generating plans, or an explain plan clause I could use or a DBMS_XPLAN paramter I could provide that would tell these tools to use my stats table when generating a plan, or even some way to tell autotrace. But I have found none of this.
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Aug 3, 2012
optimize this code. Scenario have to update about 40 million rows to static value, I'm committing 1Million rows in one loop. The first 1 millions rows are getting updated very fast probably in a 2 minute, after that the code just hungs and i don't see increase in committed rows.
Declare
cursor c1 is
select rowid from t1
where c1 is not null;
[Code]....
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Aug 15, 2013
We want to send the following XML message as IN parameter to the procedure
<?xml version="1.0" encoding="UTF-8" ?>
- <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
- <s:Body>
- <CalculateWEDBCached xmlns="http://wedb.GGG.Services/Contracts/">
- <skuItems xmlns:a="http://schemas.datacontract.org/2004/07/wedb.GGG.Services.Contracts" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
- <a:SkuItem>
[code].......
I need a procedure to get the records from the table for every SKU of XML message from the table and take one record for each SKU based on order precedence.And send the set of output records to the .net code. The order precedence is
If MODEL is not null that record should be high precedence and consider max lead_time
If MODEL and VK_UNIT is NULL then the precedence goes to STATE_ID.
The parameters in the procedure are
CREATE OR REPLACE PROCEDURE sku_proc
(
p_bu_id IN number,
p_model IN varchar2,
p_vk_unit IN XMLTYPE,
p_country_id IN varchar2,
[code].......
Query to get the data from the table based on the parameters.
SELECT bu_id,
model,
vk_unit,
country_id,
state_id,
Lead_Time,
[code].......
Here every SKU from XML message should be passed as p_vk_unit to VK_UNIT column in the query
210-39348
210-39348
210-39348
405-12132
340-30904
340-30904
340-30904
403-10890
403-10890
709-10007
Based on the above query assume we got the following records.
BU_ID MODEL VK_UNIT COUNTRY_ID STATE_ID LEAD_TIME FC
0 M123 210-39348 AB 0 20 A
0 M123 210-39348 AB 0 30 B
0 NULL 210-39348 AB 0 10 C
0 M123 405-12132 AB 0 10 A
0 NULL 340-30904 AB 0 30 C
0 M123 340-30904 AB 0 20 B
0 M123 340-30904 AB 0 10 A
0 NULL 403-10890 AB 0 10 B
0 M123 403-10890 AB 0 20 A
0 M123 709-10007 AB 0 10 B
0 NULL NULL AB 0 20 B
0 NULL NULL AB 1 30 A
Th final query has to return the following result to the OUT parameters p_Lead_Time p_FC of the procedure.
LEAD_TIME FC
30 B
10 A
20 B
20 A
10 B
30 A
How to implement my above requirement using BULK COLLECT.
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Feb 14, 2013
I am using the below query to show the difference of data between two tables using minus operator.
teh result is correct, but is there a way can it show with a flag with new rows and updated rows something like "N" for new row and "U" for updated row.
select CURRENT_STG_GLACCTS.TABLE_NAME,
CURRENT_STG_GLACCTS.ACTIVE,
CURRENT_STG_GLACCTS.BUSINESSUNITID,
CURRENT_STG_GLACCTS.COST_CENTER,
CURRENT_STG_GLACCTS.GLACCT,
[code].......
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Jul 27, 2011
I have a entry screen, where number of rows and columns are there, now end user can change in any row and in any column multiple times, now i have to send only last changed data row and column wise to database,to complete the transaction.
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Jan 26, 2012
I have created a table like below-
PROMPT CREATE TABLE tst_fetch_vendor_data
CREATE TABLE tst_fetch_vendor_data (
vendor_data_seq_no NUMBER NOT NULL,
study_seq_no NUMBER NOT NULL,
vendor_record_seq_no NUMBER NOT NULL,
control_column_seq_no NUMBER NOT NULL,
resolved_value VARCHAR2(4000) NULL,
original_value VARCHAR2(4000) NULL,
transaction_user VARCHAR2(30) NOT NULL,
[code]....
Its just a temporary table, in which data comes and goes. I am using this in middle of a process.I am using it in a process like below--
--EXECUTE IMMEDIATE 'TRUNCATE TABLE TST_FETCH_VENDOR_DATA DROP STORAGE';
insert /*+ append */ into tst_fetch_vendor_data
(select * from vendor_data vd
where vd.control_column_seq_no in
(select control_column_seq_no from temp_control_column));
dbms_stats.gather_table_stats('EPDSYSREP','TST_FETCH_VENDOR_DATA',ESTIMATE_PERCENT=>100,
METHOD_OPT=>'for all indexed columns size auto',CASCADE=>True);
code to use that table..This table can contain data from 0 to 108000000 records.Now my questions are-
1. How much should I select sampling size (currently its 100%)Can I use dbms_stats.auto_sample_size, what will be the effect?
2. dbms_stats is good approach or should I use dynamic sampling.
3. what about the approach using CTAS instead of inserting data through insert.
4. What about pl/sql table with index or with clause query.
5. Do I need to rebuild index after inserting data into table.
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Aug 21, 2011
Table contains 10k records,we are going to insert data into another table with FORALL bulk collect limit 1000. if i use 10000 ,it's completed fast compared to 1000 limit.Can u tell me which one is better Limit.
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