Last updated on May 19th, 2019 at 05:47 pm
Few days back I did create the physical standby database for our Oracle production database.I thought of sharing the experience with you.So here are detailed steps on How to do physical Standby creation
I am assuming we have Oracle ASM configured on both the primary and standby site. ASM instance has DATA diskgroup for storing datafile and FLASH for archive log files
Configuration
Production Database Name: TEST
Production Database Instance Name: TEST
Production db_unique_name: TEST
Standy Database Instance Name: TESTSTDY
Standy db_unique_name: TESTSTDY
Primary Production servername: mygoeasy1
Standby servername: mygoeasy2
Step on How to do physical Standby creation
Step 1:
On Primary side Enable Force Logging, so that even the nologging data uploaded at primary site is transferred to Standby site
[oracle@mygoeasy1]$ sqlplus / as sysdba SQL> ALTER DATABASE FORCE LOGGING; Database altered.
Step 2
On the primary node, create a staging directory for taking the backup of the production database to create the standby database
[oracle@mygoeasy1]$ mkdir –p /export/home/oracle/backup
Step 3.
Create the same exact path on the standby host:
[oracle@mygoeasy2]$ mkdir -p /export/home/oracle/backup
Step 4:
On the primary node, connect to the primary database and create PFILE from SPFILE in the staging directory. For example:
sqlplus / as sysdba create pfile='/export/home/oracle/backup/test.ora' from spfile;
Step 5:
Take the backup of primary site using rman backup command
RMAN> run
{
backup device type disk format '/export/home/oracle/backup/%U' database;
backup device type disk format '/export/home/oracle/backup/%U' current controlfile for standby;
}
Starting backup at 02-JAN-16
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=30 devtype=DISK
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00001 name=+DATA/TEST/datafile/system.2271.57967558991
input datafile fno=00003 name=+DATA/TEST/datafile/sysaux.273.57967558991
input datafile fno=00002 name=+DATA/TEST/datafile/undo1.472.57967558991
input datafile fno=00004 name=+DATA/TEST/datafile/undo2.472.57967558991
input datafile fno=00005 name=+DATA/TEST/datafile/undo3.372.57967558991
channel ORA_DISK_1: starting piece 1 at 02-JAN-16
Copy the backup created on site mygoeasy1 to mygoeasy to the same directory
Step 6
Copy the ORACLE_HOME from primary site to standby site and Prepare the initialization file for standby instance on the server mygoeasy2
[oracle@mygoeasy2]$ mkdir -p /u001/app/oracle/product/11.2/
Tar the ORACLE_HOME from primary site and copy it this folder ,untar it and run clone.pl to configure it
[oracle@mygoeasy2]$ mkdir -p /u001/app/oracle/product/11.2/diag [oracle@mygoeasy2]$ [oracle@mygoeasy2]$ export ORACLE_HOME=/u001/app/oracle/product/11.2 [oracle@mygoeasy2]$ export ORACLE_SID=TESTSTDY ;cd $ORACLE_HOME/dbs [oracle@mygoeasy2]$orapwd file=orapwTESTSTDY password=oracle ignorecase=Y
The password oracle is the sys password for both the primary and standby site.The general format for orapw
is
orapwd file=<fname> entries=<users> force=<y/n> ignorecase=<y/n> nosysdba=<y/n> password=<sys pass> [oracle@mygoeasy2]$ ls -ltr *TESTSTDY* -rw-r----- 1 oracle oinstall 3536 Jan 3 13:15 orapwTESTSTDY [oracle@mygoeasy2]$cd $ORACLE_HOME/dbs
Copy the init.ora from Primary site and Set the below parameters in init.ora of standby,
*.db_name='TEST' *.db_create_file_dest='+DATA' *.db_create_online_log_dest_1='+DATA' *.db_file_name_convert='+DATA/TEST/datafile/','+DATA/TESTSTDY/datafile/','+DATA/TEST/tempfile/','+DATA/TESTSTDY/tempfile/' *.log_file_name_convert='+DATA/TEST/onlinelog/','+DATA/TESTSTDY/onlinelog/' ,'+FLASH/TEST/onlinelog/','+FLASH/TESTSTDY/onlinelog/' *.db_unique_name=TESTSTDY
The memory parameter can remain same as production or we can set it low also
-rw-r----- 1 oracle oinstall 1511 Jan 3 15:55 initTESTSTDY.ora
Step 7.
Create a tnsnames names at the standby site
[oracle@mygoeasy2]$cd $ORACLE_HOME/network/admin TEST = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST =mygoeasy1 )(PORT = 1529)) ) (CONNECT_DATA = (SERVICE_NAME = TEST) ) ) TESTSTDY = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST =mygoeasy2)(PORT = 1529)) ) (CONNECT_DATA = (SERVICE_NAME = TESTSTDY) ) ) -rw-r----- 1 oracle oinstall 1511 Jan 3 15:55 tnsnames.ora
You can check the connectivity now
[oracle@mygoeasy2] sqlplus sys/oracle@TEST as sysdba The above command should connect successfully [oracle@mygoeasy2] sqlplus sys/oracle@TESTSTDY as sysdba The above command should connect successfully
Step 8.
Create the standby database using RMAN duplicate command at the standby site
[oracle@mygoeasy2]$ /u001/app/oracle/product/11.2/bin/rman target sys/oracle@TEST auxiliary / Recovery Manager: Release 11.2.0.4.0 - Production on Sun Jan 3 16:56:09 2016 Copyright (c) 1982, 2005, Oracle. All rights reserved. connected to target database: TEST (DBID=758755757) connected to auxiliary database: TEST (not mounted) RMAN> duplicate target database for standby; The above command will restore the datafiles to the ASM storage
After this we need to Add standby redo logs to standby database
[oracle@mygoeasy2]$sqlplus / as sysdba SQL> alter database add standby logfile group 4 '+DATA' size 1000m; Database altered. SQL> alter database add standby logfile group 5 '+DATA' size 1000m; Database altered. SQL> alter database add standby logfile group 6 '+DATA' size 1000m; Database altered. SQL> alter database recover managed standby database using current logfile disconnect; Database altered.
SQL>
Step 9.
Establish the connectivity to primary from standby
[oracle@mygoeasy2]$sqlplus / as sysdba SQL> select name,database_role from v$database; NAME DATABASE_ROLE --------- ---------------- TEST PHYSICAL STANDBY SQL> alter system set standby_archive_dest='+FLASH'; System altered. SQL> alter system set log_archive_dest_1='location=+FLASH valid_for=(all_logfiles,all_roles) db_unique_name=TESTSTDY'; SQL> alter system set log_archive_config='dg_config=(TEST,TESTSTDY)'; System altered. SQL> alter system set log_archive_dest_2='service=TEST lgwr async noaffirm valid_for=(online_logfiles,primary_role) db_unique_name=TEST'; System altered. SQL> alter system set fal_client=TESTSTDY; System altered. SQL> alter system set fal_server=TEST; System altered. SQL> alter system set standby_file_management=auto; System altered.
Step 10.
Create tnsnames or connect strings at Primary server
TEST = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST =mygoeasy1 )(PORT = 1529)) ) (CONNECT_DATA = (SERVICE_NAME = TEST) ) ) TESTSTDY = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST =mygoeasy2)(PORT = 1529)) ) (CONNECT_DATA = (SERVICE_NAME = TESTSTDY) ) )
Note:-
TESTSTDY will connect to standby while TEST connects to primary itself
You can check the connectivity now
[oracle@mygoeasy1] sqlplus sys/oracle@TEST as sysdba The above command should connect successfully [oracle@mygoeasy1] sqlplus sys/oracle@TESTSTDY as sysdba The above command should connect successfully
Step 11.
Establish the connectivity to standby from primary
SQL> alter system set log_archive_config='dg_config=(TEST,TESTSTDY)'; System altered. SQL> alter system set log_archive_dest_2='service=TESTSTDY arch async noaffirm valid_for=(online_logfiles,primary_role)'; System altered. SQL> alter system set fal_client=TEST; System altered. SQL> alter system set fal_server=TESTSTDY; System altered. SQL> select name,database_role from v$database; NAME DATABASE_ROLE --------- ---------------- TEST PRIMARY SQL>
Step 12.
Check the standby for recovery
After the setting in Step 10 and Step 11, Standby database will start receiving the archive logs, and recovery will be started
Verify that managed recovery is running:
[oracle@mygoeasy2]$sqlplus / as sysdba Verify the MRP is running as expected SQL> select process, status , sequence# from v$managed_standby; PROCESS STATUS SEQUENCE# --------- ------------ ---------- ARCH CLOSING 991 ARCH CLOSING 992 MRP0 APPLYING_LOG 989 RFS IDLE 0 RFS IDLE 0 RFS IDLE 104
and check for the gap
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;
The difference should be zero
Step 13.
Set role transition specific parameters for current primary
[oracle@mygoeasy1]$sqlplus / as sysdba SQL> alter system set db_file_name_convert='+DATA/TESTSTDY/datafile/','+DATA/TEST/datafile/','+DATA/TESTSTDY/tempfile/','+DATA/TEST/tempfile/' scope=spfile; System altered. SQL> alter system set log_file_name_convert='+DATA/TESTSTDBY/onlinelog/','+DATA/TEST/onlinelog/',+FLASH/TESTSTDBY/onlinelog/','+FLASH/TEST/onlinelog/' scope=spfile; System altered. SQL> alter system set standby_file_management=auto; System altered. Configure a Standby Redo Log at the primary site also SQL> alter database add standby logfile group 4 size 1000m; Database altered. SQL>alter database add standby logfile group 5 size 1000m Database altered. SQL>alter database add standby logfile group 6 size 1000m Database altered.
All the above steps are to be executed with extreme care and We will have working standby site after the steps are completed.
Please let me know if you like this post on how to create physical standby database .Please do provide the feedback