Saturday, July 24, 2010

Know the power of REPAIR utility in DB2

Hello my blog readers...

In this blog, I am going to explain how you can utilize REPAIR utility the most.

Everybody know REPAIR utility is popularly used for resetting the pending states of Index and Tablespaces.



Example 1: 
Everybody know REPAIR utility is popularly used for resetting the pending states of Index and Tablespaces.

//STEP3    EXEC DSNUPROC,UID='SSTRR',                            
//            UTPROC='',SYSTEM='DSN2'                                      
//SYSIN    DD *                                                            
  REPAIR OBJECT                                                            
  SET INDEX (ALL) TABLESPACE DTSG10.SSTRR NORBDPEND                  
  SET TABLESPACE DBTEST1.STEST PART 1 NOAUXCHKP                        
  SET TABLESPACE DBTEST1.STEST PART 4 NOCHECKPEND
/*

Example 2:
Suppose you want to delete a row corresponding to a ROWID mentioned in the referential violation constraint.


REPAIR
  LOCATE TABLESPACE DTSG10.TS1 RID (X'0000000503')
    DELETE




Example 3:
Replacing damaged data and verifying replacement.

* Repair the specified page of table space DTSG10.STEST1, as indicated by the LOCATE clause.
* Verify that, at the specified offset (50), the damaged data (0A00) is found, as indicated by the VERIFY clause.
* Replace the damaged data with the desired data (0D11), as indicated by the REPLACE clause.
* Initiate a dump beginning at offset 50, for 4 bytes, as indicated by the DUMP clause. You can use the generated dump to verify the replacement.

//STEP1    EXEC  DSNUPROC,UID='IUIQU1UH',UTPROC='',SYSTEM='DSN'
//SYSIN DD *
REPAIR OBJECT
  LOCATE TABLESPACE DSN8D81A.DSN8S81D PAGE X'02'
    VERIFY OFFSET 50 DATA X'0A00'
    REPLACE OFFSET 50 DATA X'0D11'
    DUMP OFFSET 50 LENGTH 4

Example 4:
Reporting whether catalog and directory DBDs differ. The following control statement specifies that REPAIR is to compare the DBD for DTSG10 in the catalog with the DBD for DTSG10 in the directory.

REPAIR DBD TEST DATABASE DTSG10


Example 5:
Reporting differences between catalog and directory DBDs. The following control statement specifies that the REPAIR utility is to report information about the inconsistencies between the catalog and directory DBDs for DTSG10. Run this job after you run a REPAIR job with the TEST option (as shown in example 4), and the condition code is not 0. In this example, SYSREC is the output data set, as indicated by the OUTDDN option.

REPAIR DBD DIAGNOSE DATABASE DSN8D2AP OUTDDN SYSREC

Example 6:
Repairing a table space with an orphan row. After running DSN1CHKR on table space SYSDBASE, assume that you receive the following message:

DSN1812I ORPHAN ID = 20 ID ENTRY = 0190 FOUND IN
         PAGE = 0000000024

From a DSN1PRNT of page X'0000000024' and X'0000002541', you identify that RID X'0000002420' has a forward pointer of X'0000002521'.

Repair the table space by taking the following actions:

1. Submit the following control statement, which specifies that REPAIR is to set the orphan's backward pointer to zeros:

      REPAIR OBJECT LOG YES
       LOCATE TABLESPACE DSNDB06.SYSDBASE RID X'0000002420'
        VERIFY OFFSET X'0A' DATA X'0000002422'
        REPLACE OFFSET X'0A' DATA X'0000000000'

Setting the pointer to zeros prevents the next step from updating link pointers while deleting the orphan. Updating the link pointers can cause DB2 to abnormally terminate if the orphan's pointers are incorrect.

2. Submit the following control statement, which deletes the orphan:

      REPAIR OBJECT LOG YES
       LOCATE TABLESPACE DSNDB06.SYSDBASE RID X'00002420'
        VERIFY OFFSET X'06' DATA X'00002521'
        DELETE


Example 7:
Updating version information. The control statement specifies that REPAIR is to update the version information in the catalog and directory for table spaces STEST1, STEST2, and STEST3.

REPAIR VERSIONS example control statement

//STEP1    EXEC DSNUPROC,UID='JUKQU3AS.REPAIR',TIME=1440,        
//         UTPROC='',                                            
//         SYSTEM='SSTR',DB2LEV=DB2A                             
//SYSIN    DD *                                                       
 REPAIR VERSIONS TABLESPACE DTSG10.STEST1                   
  REPAIR VERSIONS TABLESPACE DTSG10.STEST1 2                   
  REPAIR VERSIONS TABLESPACE DTSG10.STEST1 3  

So arm the knowledge of REPAIR Utility and set for the adventure.

Cheers..

Prakash C Singh.
IBM Certified DB2 DBA

1 comment:

Rikdeb Mukherjee said...

Nice and useful info...I Would like to come bck and read again!!..

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