2026-03-12 21:01:38

tiddlywiki/Failover example.txt

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+###Check max sequence is ok on both dataguard and cascades both are in sync
+
+## normally this part is ok ,Check the protection mode and role in standby cascade database it should be maximum performance, if not change to maximum performance. Once mode is fine
+SELECT OPEN_MODE,PROTECTION_MODE,DATABASE_ROLE FROM V$DATABASE; OPEN_MODE PROTECTION_MODE DATABASE_ROLE
+NOTE: If protection_mode is other than maximum performance, then alter it as below.
+SQL> ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE PERFORMANCE;
+
+ ##Stop recovery on both dataguard  and cascades 
+recover managed standby database cancel;
+####Now Action on cascades only :
+###Now activate standby 
+alter database recover managed standby database finish;
+alter database activate standby database;
+##Check the role and mode of the database cascade, it should be primary now 
+select name,open_mode,database_role from v$database;
+#### open database and bounce , recovery should be stopped to avoid active dataguard flag .
+Alter databas open;
+Bounce your database and verify database name its open mode and its role.
+select database_role from v$database;
+
+###Change dbname with nid utility 
+Step:1 Mount the database with old db name(standby)
+Step:2 Run the nid utility (syntax: nid sys/password@CURRENT_DBNAME DBNAME=NEW_DBNAME)
+Step:3 Once you run the nid utility the name will be changed to new db name.
+Step:4 Then you have to change the db_name in the parameter file. Using alter system  command and start db in nomount to check ok .
+Step:5 change the spfile to a new db name. Check spfile name correct with new dbname.
+Step:6 Now open the database with reset logs option.
+Step7:  register database information for listener  alter system register. 
+###And check connection using sqlplus from client .