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How to Resolve ORA-12008: error in materialized view refresh path

This error means something prevent the snapshots from reading the master tables when refreshing the snapshots.

The possible causes could be:
  • Columns have been added into the master table:
  • In most cases, you know who did it without notifying DBA.
    You should: recreate the snapshot.
  • The master table has been dropped:
  • If the dropping is planned.
    You should: drop the snapshot.
  • Database link is unavailable.
  • The accounts of database links could be locked, altered or temporarily unreachable due to network problems.
    You should: check the availability of the database link, including account status and network availability.
  • Unique constraint violated.
  • The index violation happened on the snapshot, not on the master table.
    You should: rebuild the index.
The accompanied error in the stack should provide you more information about the root cause.

I summarized the solutions as below:
  • Make a complete refresh: If the master table is quite small.
  • Rebuild the unique index of the snapshot: If the master table is quite large.
  • Rereate the snapshot: If DDL of the master table is altered or you had tried all above methods but failed.
  • Drop the snapshot: If the master table is no longer existent.

6 thoughts on “How to Resolve ORA-12008: error in materialized view refresh path”

  1. I create snapshot withou the lob column but after refresh i find the lob is included and after more refreshes i get th ora-12008
    Please help

  2. I had a column which was a char(1) being converted to a number in the MV SELECT statement. That was enough to blow it up when trying to refresh it.

    You can see the invalid number reported here.

    ORA-06512: at “SYS.DBMS_SNAPSHOT_KKXRCA”, line 2370
    ORA-01722: invalid number
    ORA-06512: at “SYS.DBMS_SNAPSHOT_KKXRCA”, line 85
    ORA-06512: at “SYS.DBMS_SNAPSHOT_KKXRCA”, line 245

    That’s what I get for not testing the SQL outside of the MV create script.

  3. The user says “when we try to refresh MVIEW through Kafka job(Java Program). It is taking time and endup in below error.
    “ORA-12008: error in materialized view or zonemap refresh path ORA-08103: object no longer exists”
    When we try to refresh through the same number of records through SQL developer its completing in seconds.
    job run date : 23-JAN-2023 20:38:21
    Also I am unable to generate AWR during the time to analyze further. ”

    Could you pls suggest.

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