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QUERY DATAGUARD AND STANDBY STATUS

-- Find which logs were applied in the last day  SELECT SEQUENCE#, to_char(FIRST_TIME,'hh24:mi:ss dd/mm/yyyy'), to_char(NEXT_TIME,'hh24:mi:ss dd/mm/yyyy'),APPLIED FROM V$ARCHIVED_LOG where next_time>sysdate-1 ORDER BY SEQUENCE# ; -- Find last applied log   select to_char(max(FIRST_TIME),'hh24:mi:ss dd/mm/yyyy') FROM V$ARCHIVED_LOG where applied='YES';   -- What are the managed standby processes doing?   SELECT PROCESS, STATUS, THREAD#, SEQUENCE#, BLOCK#, BLOCKS FROM V$MANAGED_STANDBY;   -- Are we on production or standby?  SELECT DATABASE_ROLE, DB_UNIQUE_NAME INSTANCE, OPEN_MODE, PROTECTION_MODE, PROTECTION_LEVEL, SWITCHOVER_STATUS FROM V$DATABASE;   -- Check for errors  SELECT MESSAGE FROM V$DATAGUARD_STATUS;   -- Check that the DB was openned correctly   SELECT RECOVERY_MODE FROM V$ARCHIVE_DEST_STATUS; -- important lag statistics  select * from v$dataguard_stats;  -- co...
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Oracle Standby database

Shutting Down a Physical Standby Database Issue the following query to find out if the standby database is performing Redo Apply or real-time apply.  If the MRP0 or MRP process exists, then the standby database is applying redo. SQL> SELECT PROCESS, STATUS FROM V$MANAGED_STANDBY; If Redo Apply is running, cancel it as shown in the following example: SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL; Shut down the standby database. SQL> SHUTDOWN IMMEDIATE; Start and mount the physical standby database: SQL> STARTUP MOUNT; Start Redo Apply or real-time apply: To start Redo Apply, issue the following statement: SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE  DISCONNECT FROM SESSION; To start real-time apply, issue the following statement: SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE  USING CURRENT LOGFILE; ALTER SESSION SET nls_date_format=’DD-MON-YYYY HH24:MI:SS’; select ...
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DBA_LOCKS

select l.session_id, l.oracle_username, l.os_user_name, o.object_name , o.owner from gv$locked_object l, dba_objects o where l.object_id = o.object_id; select l.session_id, l.oracle_username, l.os_user_name, o.object_name , o.owner, 'alter system kill session ''' || s.sid || ',' || s.serial# ||''';' kill_session from v$locked_object l, dba_objects o, v$session s where l.object_id = o.object_id and l.session_id = s.sid; select sid, serial# from gv$session where sid = 0000; alter sysetm kill session ''; select s.sid, s.serial#, p.spid unix_process, s.osuser, s.username, s.machine, s.program, s.sql_hash_value current_hash_value, q1.sql_text current_sql_text, s.prev_hash_value prev_hash_value, q2.sql_text prev_sql_text, to_char(s.logon_time,'DD/MM/YYYY HH24:MI') session_logon_time, o.owner ||'.'|| o.object_name locked_object, l.type lock_type, l.lmode lock_mode, l.ctime lock_time_in_sec from v$lock l, v$session s, v$pro...
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