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cursor: mutex X cursor: mutex S
Symtons: Bad Performance, Query running long. Not using optimal plan so on..or New upgrade to 11g In AWR you see.It is evident that most of the db time is spent on Mutex X and SWhat is a...
View ArticleHow to change SCAN VIPs in 11gR2
Below process is testing and worked when the SCAN vips are configured via the DNS.Backup:Hosts fileocrconfig -manualbackup voting disks using "dd"following command can be used:$ nslookup...
View ArticleActive data guard in 11g - How to activate "Active Data guard" feature in 11g.
How to activate Active Data guard feature in 11g.Here I am converting an existing physical standby database to Read only standby database with real time redo apply.Given you have a UP and running...
View ArticleORA-38305: object not in RECYCLE BIN
Perils of having recyclebin turned off in your database.For me it was a requirement to have the recyclebin turned off, since my application creates temporary staging tables and drops them daily and I...
View ArticleORA-08104: this index object is being online built or rebuilt
alter index sameer.myindex rebuild online*ERROR at line 1:ORA-08104: this index object 59081 is being online built or rebuiltAs long as the index is not rebuild all access to the index will result in...
View ArticleORA-01502: index or partition of such index is in unusable state
Exploring ORA-01502 error and why we usually get this error message. I am not explaining why/how the index status changed to unusable( mostly due to the table move and alter index xxxx unusable ..)You...
View ArticleALTER TABLE MOVE
You can use dbms_redef for reorg:-Redefining Tables OnlineIn any database system, it is occasionally necessary to modify the logical or physical structure of a table to:Improve the performance of...
View ArticleRMAN switch database to copy
RMAN image copy .. switching database to image copy backup.>r sqlsqlplus / as sysdbaSQL*Plus: Release 10.2.0.4.0 - Production on Mon Aug 23 15:09:10 2010Copyright (c) 1982, 2007, Oracle. All Rights...
View ArticleORA-01586 ORA-39701 database must be mounted EXCLUSIVE and not open for this...
Dropping the database :Â Mount the database in restrict mode: Â SQL> startup mount restrict;ORACLE instance started.Database mounted.SQL> select instance_name from...
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ORA-15204: database version is incompatible with diskgroup while creating the...
While creating the database via DBCA you may see the below error:or get the below error:"ORA-15204: database version 11.2.0.0.0 is incompatible with diskgroup DBFS_DG" while creating the...
View ArticleEXADATA X2-2 Creating DBFS fliesystem/share on EXADATA X2-2
 Environment:EXADATA X2-2OS: LinuxImage version: 11.2.3.2.0.120713DB - 11.2.0.3For Linux database servers, there are several steps to perform as root. Solaris database servers do not require this step...
View ArticleORA-01502: index or partition of such index is in unusable state
Exploring ORA-01502 error and why we usually get this error message. I am not explaining why/how the index status changed to unusable( mostly due to the table move and alter index xxxx unusable ..)You...
View Articleoracle Move datafile into ASM
How to move a datafile that was created on the OS to ASM.Issue:Datafile created on the OS instead of in ASMGiven:RAC 3 nodes tablespace has multiple datafiles  Check the status of the file:select...
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Find Exadata IO saved by smart scan and offload to cells
Find amount of I/O saved by smart scan vs Total I/OorFind amount of I/O transported from cell to DB orFind amount of I/O saved by storage index orFind amount of I/O saved by predicate offloadImage...
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Change Concurrent manager for a Program
How to change a concurrent manager for a program.Ex:-1) exclude the program from the standard manager:SYSADMIN--> Concurrent --> Manger -->Define --> Specialization rules:Exclude the...
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11gR2 -Oracle Index usage monitoring
To start monitoring the index usage:ALTER INDEX MONITORING USAGE;To stop:ALTER INDEX MONITORING USAGE;To monitor the status if you can login as owner then use select * from v$object_usage;If viewing...
View ArticleEXADATA I/O CALIBRATE ON Database server
We can usually use calibrate_io procedure but for EXADATA it is recommended we manually set the values on the database server.Traditional Method:DBMS_RESOURCE_MANAGER.CALIBRATE_IOEx:-unless until you...
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Article 6
Oracle Ebiz R12 -- How To Clear Caches In R12 you can directly clear the cache from UI as SYSADMIN.Functional level (individual product/all product cache)Functional Administrator -> Core Services...
View ArticleOracle 11g Remove trace files automatically using adcri
Oracle Automatic trace files cleanup:In 11g we can clean/remove the trace files automatically using adrci.adrci> help purgeDiagnostic data Purging in ADR is controlled by two attributes:-...
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