We are experiencing tx row lock wait time over hours. There is no blocking session and it seems that the application hangs. What is funny is that when we gather_stats on the tables, those tx row lock wait are being released.
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I have problem/misunderstanding with gather schema stat utility of oracle. Herewith i'm posting my try and output of it. My main question is why the column 'LAST_ANALYZED' of dba_tables not updated on gathering fresh schema level statistics.
SQL>select OWNER,TABLE_NAME,NUM_ROWS,AVG_ROW_LEN,BLOCKS,SAMPLE_SIZE,LAST_ANALYZED from dba_tables where owner='STO' and rownum<=10 order by LAST_ANALYZED;
OWNER TABLE_NAME NUM_ROWS AVG_ROW_LEN BLOCKS SAMPLE_SIZE LAST_ANAL
[code]...
10 rows selected.
SQL>execute dbms_stats.gather_schema_stats(OWNNAME => 'STO', OPTIONS => 'GATHER AUTO');
PL/SQL procedure successfully completed.
SQL> select OWNER,TABLE_NAME,NUM_ROWS,AVG_ROW_LEN,BLOCKS,SAMPLE_SIZE,LAST_ANALYZED from dba_tables where owner='STO' and rownum<=10 order by LAST_ANALYZED;
OWNER TABLE_NAME NUM_ROWS AVG_ROW_LEN BLOCKS SAMPLE_SIZE LAST_ANAL
------------------------------ ------------------------------ ---------- ----------- ---------- ----------- ---------
STO BILLSLIPB 7695 26 36 7695 29-MAR-10
STO BILL_CHECKING_SLIP 2634 71 28 2634 29-MAR-10
STO FACTORYBILLA 2 119 1 2 29-MAR-10
[code]...
10 rows selected. SQL>
I am trying to look at wait events for a long running query in TOAD.I start the query on one instance of TOAD and open the Session Browser on another instance.But I am surprised to find that in "TOtal Waits" on the RHS-> SQL*Net message from client is the longest time taking and is already -> 178577 units whereas I have just started the query.
Whereas in the Current Waits it shows DB File Scattered Read currectly as some seconds.
We have a Oracle 10g database with RAC and Dataguard. When we look at the AWR report, the wait time shown by Oracle for this database is very high.
Service Time : 15.36%
Wait Time : 84.64%
This would imply Oracle is waiting for resources 85% of the time and only processing SQL queries during 15% of its non-idle time. However when we check the OS (RHEL), the iowait is only about 10% and the CPU is 80% idle. This means that that processing horsepower is available.
As such, the results between the OS and Oracle database (AWR report) seems contradictory. OS says we have CPU/IO capacity, however Oracle says we don't.
we know we can see lock mode held in session can be analysed using LM column in v$lock.But i confused in seeing LM column it all shows in numbers from 0 to 6.
eg
0,'None(0)',
1,'Null(1)',
2,'Row Share(2)',
3,'Row Exclu(3)',
4,'Share(4)',
5,'Share Row Ex(5)',
6,'Exclusive(6)')
I get the Error like this frequently
ERROR at line 1:
ORA-20001: ORA-04022: nowait requested, but had to wait to lock dictionary
object
ORA-06512: at "MDWDBA.MDW_PKG", line 917
ORA-04022: nowait requested, but had to wait to lock dictionary object
ORA-06512: at line 1
why this occurs? and how to Resolve it?
What privileges is required to gather statistics of oracle database using DBMS_STATS/ANALYZE command.
View 1 Replies View RelatedWhy do we gather table statistics manually ?Is it because of database performance.
I know In Oracle Database 10g, Automatic Optimizer Statistics Collection reduces the likelihood of poorly performing SQL statements due to stale or invalid statistics and enhances SQL execution performance by providing optimal input to the query optimizer.
Optimizer gathers statistics when 10% table rows have been changed.
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.
I am connect to remote database with a user named 'TEST', this user has dba privileges. I am not able to gather the statistics of neither test schema nor for any table that exists in this schema.
SQL> EXEC dbms_stats.gather_schema_stats('TEST', cascade=>TRUE);
BEGIN dbms_stats.gather_schema_stats('TEST', cascade=>TRUE); END;
*
ERROR at line 1:
ORA-44004: invalid qualified SQL name
ORA-06512: at "SYS.DBMS_STATS", line 13210
ORA-06512: at "SYS.DBMS_STATS", line 13556
ORA-06512: at "SYS.DBMS_STATS", line 13634
ORA-06512: at "SYS.DBMS_STATS", line 13593
ORA-06512: at line 1
[code]....
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);
modify this script to show the table name, rowidwhich is locked?
In addtion,output of script below. In particular, I am trying to understand if there anyactive locks.
set pagesize 85
col username format a10
col osuser format a15
col sid format 9999
[code]...
Just noticed MR(media recovery lock ) in our database,further check showd all datafiles had this lock since our database was shutdown abortly but was startup gracefully.
View 2 Replies View RelatedI have a RAC environment with 3 nodes and application using Oracle Form Reports that access the database. Every day the application cause many locks on database when execute insert, update and delete. I don't understand why so much locks. Are there a way to avoid this? Always I have to eliminate session causing locks.
View 27 Replies View RelatedDuring 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.
View 5 Replies View RelatedI am facing following message with alertlog file. It appearing much frequently and filling alertlog file.
Transaction recovery: lock conflict caught and ignored
Our server got crash in server1 and we recovered the same DB to server2 using RMAN back up. But while running our scheduler for email alert we got the error message as ORA-01157: cannot identify/lock data file 201 - see DBWR trace file ORA-01110: data file 201: 'D:ORADATAKFDBTEMP01.DBF' Our temp file is already in E folder.
View 4 Replies View RelatedWhen 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$session view,i found sid and serial# and at same time i queried dba_jobs and saw one jobs is running at this time.Now how to compile this object.
we can easily find out the locks which are currently active session.
Is any other way to find out locks on particular date and time using data dictionary?
For example, we have to find whether TT_objects occured the lock or not on ON yesterday.
I am using Forms 6i and developed a Master Detail Oracle Form for Oracle EBS 11i application.
I was asked to write a pl/sql program so that.. When a user updating an existing record at the same time another user query the same record and try to update the same time, the record should be locked and a message should popup saying the record is being updated by another user.
what does mean VERSION_TIME column in V$DATABASE;i know that there is an other column which is called CREATED which indicates when the database has been created and i think it will never change,but, what about VERSION_TIME ? when does it change ?
View 6 Replies View RelatedI have an AWR report based on two snapshots one an one hour time window, under the "SQL ordered by Elapsed Time" section, there is a query having Elapsed Time = 7012 seconds, which is almost two hours, how is this possible? I have been told that this i aggregate value of all sessions.
View 3 Replies View RelatedI have created a job using DBMS_SCHEDULER with named schedule.
After i have modified the schedule using the below queries,
exec dbms_scheduler.disable( 'JOB1' );
exec dbms_scheduler.set_attribute_null('JOB1','schedule_name');
exec DBMS_SCHEDULER.SET_ATTRIBUTE( name => 'JOB1', attribute => 'repeat_interval', value => 'freq=WEEKLY;BYDAY=SUN,WED,FRI;BYHOUR=05');
exec dbms_scheduler.enable( 'JOB1' );
I am using the client system to change the setting and the time zone differs from that of production. Even though the job is scheduled to run at 5 AM it show the start date as 6:30 PM which is the client system time.
What should be our approach when we see the disk response time is bad for a particular tablespace in database.I heard a good disk response time should be on an average 10ms.
View 2 Replies View Relatedour system admin is changing the time zone on solaris system, how can it effect my DB or as DBA what should i check before he do that and after he change the time zone. he is changing the time zone because of an issue with the DST (Daylightsaving time).
View 1 Replies View RelatedI use the following query to find out the remaining time to complete the table statistics which is running currently.
SELECT SID, SERIAL#, opname, SOFAR, TOTALWORK,username,context,
ROUND(SOFAR/TOTALWORK*100,2) COMPLETE
FROM V$SESSION_LONGOPS
WHERE
TOTALWORK != 0
AND SOFAR != TOTALWORK
order by 1;
SOFAR column shows 9325 and totalwork column shows 12287.How to calculate the columns in terms of hours and minutes ?
And also sometime the query never shows the output of the query for the current running query.
I have create a mview using a dblink with the refresh difference of every 10min. Suddenly I check the mview refresh date and time it was not getting refreshed automatically at the time interval specified.
drop MATERIALIZED view log on afccv.tbl_voicechat;
drop MATERIALIZED VIEW SMSCHAT.TBL_VOICECHAT_NEW1 ;
CREATE MATERIALIZED VIEW SMSCHAT.TBL_VOICECHAT_NEW1
ORGANIZATION HEAP PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS NOLOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
[code]....
I am trying to find out what is the cause of not refreshing and also googled for the same. got some link also either not linked to same problem or not cleared.. Where should i checked regarding the error cause.
i am using oracle 10g on solaris 10 os.currently archived log is generated by size wise 52 mb.i want to know whar is the best practice for archive log generation . it should be time interval or size wise.
View 1 Replies View Relatedour DB machines time is one hour ahead of Active Directory, as we sync our time with AD, is there any contribution of Database in the wrong time of solaris machines ? and for the resolution of problem, what can be checked at DB side.
View 1 Replies View RelatedI want to get the details of the SYS/SYSTEM users logon and Logoff's time.
Steps 1:
=======
SQL> SHOW PARAMETER AUDIT
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
audit_file_dest string C:ORACLEPRODUCT10.2.0ADMIN
DB10GADUMP
audit_sys_operations boolean FALSE
audit_trail string NONE
SQL>
Step 2:
=======
Set the Necessary parameters:
-----------------------------
alter system set audit_trail=db scope=spfile;
Step 3:
=======
Shutdown the DB
Step 4:
=======
Restart the DB
Step 5:
=======
For auditing the Session. Fire the below command.
AUDIT CREATE SESSION;
Step 6:
=======
select DISTINCT USERNAME,os_username,timestamp,logoff_time
from DBA_audit_session;
When I fire the above query, I couldn't get the SYS user's LOGOFF time. But for rest of the users, I am getting.
