Possible Data Guard Issue

  • From: Scott Canaan <srcdco@xxxxxxx>
  • To: "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
  • Date: Mon, 20 Jun 2022 17:05:02 +0000

We are running Oracle 19.15 on Red Hat 7.

On Friday, one of my co-workers tried to convert the physical standby to a 
snapshot standby to use it to refresh another database.  He got an error saying 
more standby was needed in order to convert.  Looking into the alert log, there 
are messages saying that several files are "fuzzy".  He re-established the data 
guard, but now the standby database says that all of the files are "fuzzy".

DGMGRL> show configuration

Configuration - CLAWPRDA

  Protection Mode: MaxPerformance
  Members:
  CLAWPRDB - Primary database
    CLAWPRDA - Physical standby database

Fast-Start Failover:  Disabled

Configuration Status:
SUCCESS   (status updated 8 seconds ago)

DGMGRL> convert database 'CLAWPRDA' to snapshot standby;
Converting database "CLAWPRDA" to a Snapshot Standby database, please wait...
Error: ORA-38788: More standby database recovery is needed

Failed.
Failed to convert database "CLAWPRDA"
DGMGRL>

SQL> select fuzzy, status, error, recover, checkpoint_change#, checkpoint_time, 
count(*) from v$datafile_header group by fuzzy, status, error, recover, 
checkpoint_change#, checkpoint_time ;

FUZ STATUS  ERROR                                                             
REC CHECKPOINT_CHANGE# CHECKPOIN            COUNT(*)
--- ------- ----------------------------------------------------------------- 
--- ------------------ --------- ----------------
YES ONLINE                                                                      
      16551458200934 20-JUN-22                  16

1 row selected.

SQL> select file#, substr(name, 1, 50), substr(tablespace_name, 1, 15), 
undo_opt_current_change# from v$datafile_header where fuzzy='YES' ;

           FILE# SUBSTR(NAME,1,50)                                  
SUBSTR(TABLESPA UNDO_OPT_CURRENT_CHANGE#
---------------- -------------------------------------------------- 
--------------- ----------------------------------------
               1 /oracle/data/CLAWPRDA/sys01.dbf                    SYSTEM
               2 /oracle/data/CLAWPRDA/sysaux01.dbf                 SYSAUX
               3 /oracle/data/CLAWPRDA/undotbs01.dbf                UNDOTBS
               4 /oracle/data/CLAWPRDA/users01.dbf                  USERS
               5 /oracle/data/CLAWPRDA/claws_data_enc01.dbf         
CLAWS_DATA_ENC
               6 /oracle/data/CLAWPRDA/claws_data_enc02.dbf         
CLAWS_DATA_ENC
               7 /oracle/data/CLAWPRDA/claws_data_enc03.dbf         
CLAWS_DATA_ENC
               8 /oracle/data/CLAWPRDA/claws_data_enc04.dbf         
CLAWS_DATA_ENC
               9 /oracle/data/CLAWPRDA/claws_idx_enc01.dbf          
CLAWS_IDX_ENC
              10 /oracle/data/CLAWPRDA/claws_idx_enc02.dbf          
CLAWS_IDX_ENC
              11 /oracle/data/CLAWPRDA/quest01.dbf                  QUEST
              12 /oracle/data/CLAWPRDA/claws_data_enc05.dbf         
CLAWS_DATA_ENC
              13 /oracle/data/CLAWPRDA/claws_data_enc06.dbf         
CLAWS_DATA_ENC
              14 /oracle/data/CLAWPRDA/claws_data_enc07.dbf         
CLAWS_DATA_ENC
              15 /oracle/data/CLAWPRDA/claws_data_enc08.dbf         
CLAWS_DATA_ENC
              16 /oracle/data/CLAWPRDA/claws_data_enc09.dbf         
CLAWS_DATA_ENC

16 rows selected.

SQL> select status, enabled, count(*) from v$datafile group by status, enabled ;

STATUS  ENABLED            COUNT(*)
------- ---------- ----------------
ONLINE  READ WRITE               15
SYSTEM  READ WRITE                1

2 rows selected.

SQL>

However, Cloud Control says all is well.  Logs are being shipped and applied.

Scott Canaan '88
Sr Database Administrator
Information & Technology Services
Finance & Administration
Rochester Institute of Technology
o: (585) 475-7886 | f: (585) 475-7520
srcdco@xxxxxxx<mailto:srcdco@xxxxxxx> | c: (585) 339-8659

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