Scripts to resize standby redolog files

Resize Standby Redo Logs -

1. On primary defer log shipping (dynamic change)


alter system set log_archive_dest_state_2 = defer scope = memory;
 
2. On standby database cancel managed recovery


alter database recover managed standby database cancel;
 
3. Drop standby logs on standby database


ALTER DATABASE DROP STANDBY LOGFILE GROUP 4;

ALTER DATABASE DROP STANDBY LOGFILE GROUP 5;

ALTER DATABASE DROP STANDBY LOGFILE GROUP 6;

ALTER DATABASE DROP STANDBY LOGFILE GROUP 7;
 
4. Recreate the new Standby logs


alter database add standby logfile THREAD 1 group 4 ('+DATA(ONLINELOG)','+FRA(ONLINELOG)') SIZE 1000M;

alter database add standby logfile THREAD 1 group 5 ('+DATA(ONLINELOG)','+FRA(ONLINELOG)') SIZE 1000M;

alter database add standby logfile THREAD 1 group 6 ('+DATA(ONLINELOG)','+FRA(ONLINELOG)') SIZE 1000M;

alter database add standby logfile THREAD 1 group 7 ('+DATA(ONLINELOG)','+FRA(ONLINELOG)') SIZE 1000M;
 
5. Enable log shipping on the Primary database


alter system set log_archive_dest_state_2 = enable scope = memory;
 
6. Enable managed recovery on standby database


alter database recover managed standby database using current logfile disconnect;
 
7. Check the the standby logs are being used by running following query :


set lines 155 pages 9999
col thread# for 9999990
col sequence# for 999999990
col grp for 990
col fnm for a50 head "File Name"
col "Fisrt SCN Number" for 999999999999990
break on thread
# skip 1
select a.thread#
,a.sequence#
,a.group# grp    
, a.bytes/1024/1024 Size_MB    
,a.status    
,a.archived    
,a.first_change# "First SCN Number"    
,to_char(FIRST_TIME,'DD-Mon-RR HH24:MI:SS') "First SCN Time"  
,to_char(LAST_TIME,'DD-Mon-RR HH24:MI:SS') "Last SCN Time"  from
 v$standby_log a  order by 1,2,3,4
 /
 
Should return the following :


THREAD#  SEQUENCE#  GRP    SIZE_MB STATUS     ARC Fisrt SCN Number First SCN Time              Last SCN Time
-------- ---------- ---- ---------- ---------- --- ---------------- --------------------------- ---------------------------
       1          0    4        100 UNASSIGNED NO                 0
                  0    6        100 UNASSIGNED YES                0
                  0    7        100 UNASSIGNED YES                0
               7316    5        100 ACTIVE     YES        153517071 04-Feb-11 13:39:32          04-Feb-11 13:40:41