Author: dbalifeeasy

Slow Complete Refresh of Materialized View in Oracle Database

The status of the materialized view with 30 million records is ‘UNUSABLE’, so a complete refresh is required to fix this problem .

The complete refresh process ran for 3 hours, then we have to kill it.

SQL>  execute dbms_mview.refresh(MVIEW1','c');



^C^C
^C^C^C^C^C^C^C

BEGIN dbms_mview.refresh('MVIEW1','c'); END;

*
ERROR at line 1:
ORA-12152: TNS:unable to send break message


Elapsed: 03:11:16.16

There are a couple of following ways to speed up this complete refresh, one of them only takes 27 minutes.

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Change Materialized View Refresh Mode Makes Materialized View Unusable

The materialized view was in good status until when changes its refresh mode:

SQL>  select MVIEW_NAME,REFRESH_MODE,REFRESH_METHOD,STALENESS 
      dba_mviews 
      where mview_name='MVIEW1';

MVIEW_NAME     REFRES     REFRESH_  STALENESS  
-------------- ---------- --------- ----------
MVIEW1         COMMIT     FAST      FRESH    


SQL> alter materialized view MVIEW1 refresh fast on demand;



SQL>  select MVIEW_NAME,REFRESH_MODE,REFRESH_METHOD,STALENESS 
      dba_mviews 
      where mview_name='MVIEW1';

MVIEW_NAME     REFRES     REFRESH_  STALENESS  
-------------- ---------- --------- ------------------
MVIEW1         COMMIT     FAST      COMPILATION_ERROR 

 

SQL> alter materialized view MVIEW1 compile;

Materialized view altered.


SQL>  select MVIEW_NAME,REFRESH_MODE,REFRESH_METHOD,STALENESS 
      dba_mviews 
      where mview_name='MVIEW1';

MVIEW_NAME     REFRES     REFRESH_  STALENESS  
-------------- ---------- --------- --------------------
MVIEW1         COMMIT     FAST      UNUSABLE

It might be a bug ? not quite sure why. In this situation, the materialized view has to be refreshed completed or rebuilt.

Oracle GoldenGate Version and Supported Oracle Database Version

We are always asked by clients what version of GoldenGate supports what version of Oracle databases ? or whether certain Oracle database version is supported by certain version of GoldenGate ?

The easy way is going to Oracle Support website -> Certifications.

Use GoldenGate Oracle GoldenGate 12.2.0.1.0 as an example, it supports Oracle database version back to 11.2.0.1.

For GoldenGate 19.1.0.0.0, it supports the following Oracle database versions: 19c,18c,12.2.0.1,12.1.0.2, 12.1.0.1 and 11.2.0.4.

For GoldenGate 21.3.0.0.0, it only supports Oracle database 21c, 19c, 12.1.0.2 and 11.2.0.4.

For GoldenGate 21.3.0.0.1, it only supports Oracle database 19c and 21c.

Materialized View Refresh Group

This post demonstrates how to create and maintain a materialized view refresh group in Oracle database.

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ORA-00904: “DC”.”GUID”: invalid identifier

Some RMAN commands raise the following errors:

RMAN> list backup of database;

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of list command at 02/28/2022 14:18:45
ORA-00904: "DC"."GUID": invalid identifier

RMAN>

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