Troubleshooting DataGuard Environment – Snapper

Troubleshooting DataGuard Environment

Helping in the OTN  forums – Data Guard (OTN) , They used to post without proper information which is related to Data Guard. I often face help requests without  any usefull information, regarding to a problem. And this situation happens again and again.”

So, I’d like to offer two scripts, supposed to be run at primary and standby nodes, to help OPs gather necessary information

Questions specific to DataGuard includes “Physical standby”, “Logical Standby” , “DG Broker”, “DataGuard with RAC”.

These scripts help in the case of a Physical Standby configuration and basic information which is applicable for other environment too (Logical)

Generated log files will help us to detect and troubleshoot any errors and misconfigurations as soon as possible

Run Below scripts from SYS user from Both Primary & Standby databases.

Primary Script:-

spool dg_Primary_output.log
set feedback off
set trimspool on
set line 500
set pagesize 50
column name for a30
column display_value for a30
column ID format 99
column "SRLs" format 99
column active format 99
col type format a4
column ID format 99
column "SRLs" format 99
column active format 99
col type format a4
col PROTECTION_MODE for a20
col RECOVERY_MODE for a20
col db_mode for a15
SELECT name, display_value FROM v$parameter WHERE name IN ('db_name','db_unique_name','log_archive_config','log_archive_dest_2','log_archive_dest_state_2','fal_client','fal_server','standby_file_management','standby_archive_dest','db_file_name_convert','log_file_name_convert','remote_login_passwordfile','local_listener','dg_broker_start','dg_broker_config_file1','dg_broker_config_file2','log_archive_max_processes') order by name;
col name for a10
col DATABASE_ROLE for a10
SELECT name,db_unique_name,protection_mode,DATABASE_ROLE,OPEN_MODE,switchover_status from v$database;
select thread#,max(sequence#) from v$archived_log group by thread#;
col severity for a15
col message for a70
col timestamp for a20
select severity,error_code,to_char(timestamp,'DD-MON-YYYY HH24:MI:SS') "timestamp" , message from v$dataguard_status where dest_id=2;
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;
column FILE_TYPE format a20
col name format a60
select    name
,    floor(space_limit / 1024 / 1024) "Size MB"
,    ceil(space_used  / 1024 / 1024) "Used MB"
from    v$recovery_file_dest
order by name;
spool off

This script will generate dg_Primary_output.log file where user is connected to SQLPlus from shell.

Standby Script:-

spool dg_standby_output.log
set feedback off
set trimspool on
set line 500
set pagesize 50
set linesize 200
column name for a30
column display_value for a30
col value for a10
col PROTECTION_MODE for a15
col DATABASE_Role for a15
SELECT name, display_value FROM v$parameter WHERE name IN ('db_name','db_unique_name','log_archive_config','log_archive_dest_2','log_archive_dest_state_2','fal_client','fal_server','standby_file_management','standby_archive_dest','db_file_name_convert','log_file_name_convert','remote_login_passwordfile','local_listener','dg_broker_start','dg_broker_config_file1','dg_broker_config_file2','log_archive_max_processes') order by name;
col name for a10
col DATABASE_ROLE for a10
SELECT name,db_unique_name,protection_mode,DATABASE_ROLE,OPEN_MODE from v$database;
select thread#,max(sequence#) from v$archived_log where applied='YES' group by thread#;
select process, status,thread#,sequence# from v$managed_standby;
SELECT ARCH.THREAD# "Thread", ARCH.SEQUENCE# "Last Sequence Received", APPL.SEQUENCE# "Last Sequence Applied", (ARCH.SEQUENCE# - APPL.SEQUENCE#) "Difference"
FROM
(SELECT THREAD# ,SEQUENCE# FROM V$ARCHIVED_LOG WHERE (THREAD#,FIRST_TIME ) IN (SELECT THREAD#,MAX(FIRST_TIME) FROM V$ARCHIVED_LOG GROUP BY THREAD#)) ARCH,
(SELECT THREAD# ,SEQUENCE# FROM V$LOG_HISTORY WHERE (THREAD#,FIRST_TIME ) IN (SELECT THREAD#,MAX(FIRST_TIME) FROM V$LOG_HISTORY GROUP BY THREAD#)) APPL
WHERE ARCH.THREAD# = APPL.THREAD# ORDER BY 1;
col name for a30 
select * from v$dataguard_stats; 
select * from v$archive_gap; 
col name format a60 
select name,floor(space_limit / 1024 / 1024) "Size MB" ,ceil(space_used  / 1024 / 1024) "Used MB" from    v$recovery_file_dest order by name; 
spool off

This script will generate dg_standby_output.log file where user is connected to SQLPlus from shell. Further there would be changes in this script according to requirement. 🙂 Any comments always welcome.