Backup - DataGuard

• Startup commands
• To remove a delay from a standby
• Cancel managed recovery
• Register a missing log file
• If FAL doesn't work and it says the log is already registered
• Check which logs are missing
• Disable/Enable archive log destinations
• Turn on fal tracing on the primary db
• Stop the Data Guard broker
• Show the current instance role
• Logical standby apply stop/start
• See how up to date a physical standby is
• Display info about all log destinations
• Display log destinations options
• List any standby redo logs

Startup commands

startup nomount
alter database mount standby database;
alter database recover managed standby database disconnect;

To remove a delay from a standby

alter database recover managed standby database cancel;
alter database recover managed standby database nodelay disconnect;

Cancel managed recovery

alter database recover managed standby database cancel;

Register a missing log file

alter database register physical logfile '<fullpath/filename>';

If FAL doesn't work and it says the log is already registered

alter database register or replace physical logfile '<fullpath/filename>';

If that doesn't work, try this...

shutdown immediate
startup nomount
alter database mount standby database;
alter database recover automatic standby database;

wait for the recovery to finish - then cancel

shutdown immediate
startup nomount
alter database mount standby database;
alter database recover managed standby database disconnect; 

Check which logs are missing

Run this on the standby...

select local.thread#
,      local.sequence# from 
       (select thread#
       ,       sequence# 
       from    v$archived_log 
       where dest_id=1) local 
where  local.sequence# not in 
       (select sequence#
       from v$archived_log
       where dest_id=2 and 
       thread# = local.thread#)
/

Disable/Enable archive log destinations

alter system set log_archive_dest_state_2 = 'defer';
alter system set log_archive_dest_state_2 = 'enable';

Turn on fal tracing on the primary db

alter system set LOG_ARCHIVE_TRACE = 128;

Stop the Data Guard broker

alter system set dg_broker_start=false
/

Show the current instance role

select database_role
from v$database
/

Logical standby apply stop/start

Stop...

alter database stop logical standby apply;

Start...

alter database start logical standby apply;

See how up to date a physical standby is

Run this on the primary

set numwidth 15
select max(sequence#) current_seq
from v$log
/

Then run this on the standby

set numwidth 15
select max(applied_seq#) last_seq
from v$archive_dest_status
/

Display info about all log destinations

To be run on the primary

set lines 100
set numwidth 15
column ID format 99
column "SRLs" format 99 
column active format 99 
col type format a4

select ds.dest_id id
, ad.status
, ds.database_mode db_mode
, ad.archiver type
, ds.recovery_mode
, ds.protection_mode
, ds.standby_logfile_count "SRLs"
, ds.standby_logfile_active active
, ds.archived_seq#
from v$archive_dest_status ds
, v$archive_dest  ad
where ds.dest_id = ad.dest_id
and ad.status != 'INACTIVE'
order by
 ds.dest_id
/

Display log destinations options

To be run on the primary

set numwidth 8 lines 100
column id format 99 
select dest_id id
, archiver
, transmit_mode
, affirm
, async_blocks async
, net_timeout net_time
, delay_mins delay
, reopen_secs reopen
, register,binding 
from v$archive_dest
order by
 dest_id
/

List any standby redo logs

set lines 100 pages 999
col member format a70
select st.group#
, st.sequence#
, ceil(st.bytes / 1048576) mb
, lf.member
from v$standby_log st
, v$logfile lf
where st.group# = lf.group#
/