Monitoring Data Guard operation
As we saw in the last article on installing DataGuard in Oracle 19C, we will now see how to monitor Data Guard.
— This script is to be run on the Standby of a Data Guard Physical Standby Site
set echo off
set feedback off
column timecol new_value tstamp
column spool_extension new_value suffix
select to_char(sysdate,'Mondd_hhmi') timecol from sys.dual;
column output new_value dbname
select value || '_' output from v$parameter where name = 'db_name';
— Output the results to this file
spool dg_Standby_diag_&&dbname&&tstamp
set lines 132
set pagesize 500
set numformat 999999999999999
set trim on
set trims on
— Get the current Date
set feedback on
select systimestamp from dual;
-- Standby Site Details
set heading off
set feedback off
select 'Standby Site Details' from dual;
select '********************' from dual;
set heading on
set feedback on
col db_unique_name format a15
col flashb_on format a10
select DB_UNIQUE_NAME,DATABASE_ROLE DB_ROLE,FORCE_LOGGING F_LOG,FLASHBACK_ON FLASHB_ON,LOG_MODE,OPEN_MODE,
GUARD_STATUS GUARD,PROTECTION_MODE PROT_MODE
from v$database;
— Current SCN – this value on the primary and standby sites where real time apply is in place should be nearly the same
select DB_UNIQUE_NAME,SWITCHOVER_STATUS,CURRENT_SCN from v$database;
-- Incarnation Information
--
set heading off
set feedback off
select 'Incarnation Destination Configuration' from dual;
select '*************************************' from dual;
set heading on
set feedback on
select INCARNATION# INC#, RESETLOGS_CHANGE# RS_CHANGE#, RESETLOGS_TIME, PRIOR_RESETLOGS_CHANGE# PRIOR_RS_CHANGE#, STATUS,FLASHBACK_DATABASE_ALLOWED FB_OK from v$database_incarnation;
set heading off
set feedback off
select 'Archive Destination Configuration' from dual;
select '*********************************' from dual;
set heading on
set feedback on
-- Current Archive Locations
--
column host_name format a30 tru
column version format a10 tru
select INSTANCE_NAME,HOST_NAME,VERSION,ARCHIVER from v$instance;
column destination format a35 wrap
column process format a7
column archiver format a8
column dest_id format 99999999
select DEST_ID,DESTINATION,STATUS,TARGET,ARCHIVER,PROCESS,REGISTER,TRANSMIT_MODE
from v$archive_dest
where DESTINATION IS NOT NULL;
column name format a22
column value format a100
select NAME,VALUE from v$parameter where NAME like 'log_archive_dest%' and upper(VALUE) like 'SERVICE%';
set heading off
set feedback off
select 'Archive Destination Errors' from dual;
select '**************************' from dual;
set heading on
set feedback on
column error format a55 tru
select DEST_ID,STATUS,ERROR from v$archive_dest
where DESTINATION IS NOT NULL;
column message format a80
select MESSAGE, TIMESTAMP
from v$dataguard_status
where SEVERITY in ('Error','Fatal')
order by TIMESTAMP;
-- Redo Log configuration
-- The size of the standby redo logs must match exactly the size on the online redo logs
set heading off
set feedback off
select 'Data Guard Redo Log Configuration' from dual;
select '*********************************' from dual;
set heading on
set feedback on
select GROUP# STANDBY_GROUP#,THREAD#,SEQUENCE#,BYTES,USED,ARCHIVED,STATUS from v$standby_log order by GROUP#,THREAD#;
select GROUP# ONLINE_GROUP#,THREAD#,SEQUENCE#,BYTES,ARCHIVED,STATUS from v$log order by GROUP#,THREAD#;
— Data Guard Parameters
set heading off
set feedback off
select 'Data Guard Related Parameters' from dual;
select '*****************************' from dual;
set heading on
set feedback on
column name format a30
column value format a100
select NAME,VALUE from v$parameter where NAME IN ('db_unique_name','cluster_database','dg_broker_start','dg_broker_config_file1','dg_broker_config_file2','fal_client','fal_server','log_archive_config','log_archive_trace','log_archive_max_processes','archive_lag_target','remote_login_password_file','redo_transport_user') order by name;
— Managed Recovery State
set heading off
set feedback off
select 'Data Guard Apply Status' from dual;
select '***********************' from dual;
set heading on
set feedback on
select systimestamp from dual;
column client_pid format a10
select PROCESS,STATUS,CLIENT_PROCESS,CLIENT_PID,THREAD#,SEQUENCE#,BLOCK#,ACTIVE_AGENTS,KNOWN_AGENTS
from v$managed_standby order by CLIENT_PROCESS,THREAD#,SEQUENCE#;
host sleep 10
select systimestamp from dual;
select PROCESS,STATUS,CLIENT_PROCESS,CLIENT_PID,THREAD#,SEQUENCE#,BLOCK#,ACTIVE_AGENTS,KNOWN_AGENTS
from v$managed_standby order by CLIENT_PROCESS,THREAD#,SEQUENCE#;
host sleep 10
select systimestamp from dual;
select PROCESS,STATUS,CLIENT_PROCESS,CLIENT_PID,THREAD#,SEQUENCE#,BLOCK#,ACTIVE_AGENTS,KNOWN_AGENTS
from v$managed_standby order by CLIENT_PROCESS,THREAD#,SEQUENCE#;
set heading off
set feedback off
select 'Data Guard Apply Lag' from dual;
select '********************' from dual;
set heading on
set feedback on
column name format a12
column lag_time format a20
column datum_time format a20
column time_computed format a20
SELECT NAME, VALUE LAG_TIME, DATUM_TIME, TIME_COMPUTED
from V$DATAGUARD_STATS where name like 'apply lag';
— If there is a lag remove the comment for the select below
-- SELECT * FROM V$STANDBY_EVENT_HISTOGRAM WHERE NAME = 'apply lag' AND COUNT > 0;
set heading off
set feedback off
select 'Data Guard Gap Problems' from dual;
select '***********************' from dual;
set heading on
set feedback on
select * from v$archive_gap;
set heading off
set feedback off
select 'Data Guard Errors in the Last Hour' from dual;
select '**********************************' from dual;
set heading on
set feedback on
select TIMESTAMP,SEVERITY,ERROR_CODE,MESSAGE from v$dataguard_status where timestamp > systimestamp-1/24;
spool off
Hope this helps. See you !!!
André Ontalba – www.dbadutra.com
Disclaimer: “The postings on this site are my own and don’t necessarily represent may actual employer positions, strategies or opinions. The information here was edited to be useful for general purpose, specific data and identifications was removed to allow reach generic audience and to be useful.”
