SAP ASE Warm Standby Database using Replication Server

     Posted in Database, SAP ASE

We are going to create warm standby backup of SAP ASE Prod1 server to Standby1 server using Sybase Replication Server REP15_7 for a database named : testdb.
It is done by following the steps below.

Pre-Requisites :
a) 2 Sybase ASE instances
b) 1 replication server instance
c) 1 database named testdb

Step 1: Enable Replication Agent on both Sybase ASE Servers

sp_configure 'enable rep agent threads' ,1

Step 2: Create a login that on both Sybase ASE Servers and assign replication_role
These logins will be used in Replication Process
Create logins on both server

use master
go
sp_addlogin test_maint,xxxxx
go
grant role replication_role to test_maint
go

Step 3: Add the user to the dbo profile of the database that is invlovled in this process.

use testdb
go
sp_addalias test_maint,dbo
go

Step 4: Synchronize the logins on both the servers if required
execute this to export logins for primary server:

bcp master..syslogins out /tmp/logins.txt -c -SProd1 -Usa -P

execute this to import logins on secondary server:

bcp master..syslogins in /tmp/logins.txt -c -SStandby1 -Usa -P

Step 5: Install the replication script for both Primary & Standby Servers
Login to rep server and browse the script from location $SYBASE/REP15-5_5/scripts and execute this:

isql -Usa -P -SProd1 -Dtestdb -i changed_rs_install_primary.sql
&
isql -Usa -P -SStandby1 -Dtestdb -i changed_rs_install_primary.sql

Step 6: Create logical connection on replication server
Connect to the replication server and execute this

create logical connection LASE.testdb
go

Step 7: Create a connection from replication serer to active database

create connection to Prod1.testdb
set error class to rs_sqlserver_error_class
set function string class to rs_sqlserver_function_class
set username to test_maint
set password to xxxxx
with log transfer on
as active for LASE.testdb

Step 8: Create a login in the replication server
This user will be used to connection replication agent from Sybase ASE Servers

create user rep_user
set password '123456'
set password_expiration to '0'
go
grant connect source to rep_user
go

Step 9: Create a connection from the replication server to the standby server

create connection to Standby1.testdb
set error class to rs_sqlserver_error_class
set function string class to rs_sqlserver_function_class
set username to test_maint
set password to xxxxx
with log transfer on
as standby for LASE.testdb
use dump marker
go

Step 10: Check the logical connections
execute the following command on replication server

admin logical_status
go
LASE.testdb
[107] Prod1.testdb
Suspended/<br>[108] Standby1.testdb<br>Active/<br>[16777317] REP15_7<br>None<br>None

Step 11: Mark the database for replication and grant permissions
Execute the following command on primary server to grant permissions and activate the database to capture all activities for production database by executing the commands:

grant execute on rs_update_lastcommit to public
grant execute on rs_marker to public
grant execute on rs_check_repl_stat to public
go
sp_reptostandby 'testdb','all'
go

Step 12: Configure Replication Agent on primary server
Execute the following command on primary server to configure replication agent on primary server

use testdb
go

sp_config_rep_agent 'testdb', 'enable', 'REP15_7', 'rep_user', 'xxxxx'
go
sp_config_rep_agent 'testdb', 'send warm standby xacts', true
go
sp_setreplicate rs_marker,'true'
go
sp_setreplicate rs_update_lastcommit,'true'
go

Execute the following command to start replication agent on primary server

sp_start_rep_agent 'testdb'
go

Check the error log to verify the status of replication agent.

Step 13: Dump the database on primary server

dump database testdb to '/tmp/test_bk.dat'

Step 14: Restore the database on standby server

load database testdb from '/tmp/test_bk.dat'
go
online database testdb
go

Step 15: Resume the connection on Primary & Standby Servers and verify the replication status
Connect the replication server and execute the following commands to resume the connections of primary & secondary servers to replication server respectively.

resume connection to Prod1.testdb
go
resume connection to Standby1.testdb
go
Check the replication status by the following commands
admin logical_status
go
admin who_is_down
go

Step 16: Validate the replication between primary & standby servers
Primary:

use testdb
go
CREATE TABLE dbo.TEST1 ( COL1 int NOT NULL, COL2 varchar(25) NULL ) LOCK ALLPAGES
go

insert into dbo.TEST1 values (5,'B')

select * from TEST1

Secondary:

select * from TEST1
Author: