Oracle@Innotiive Asia~ We exist to do great things with
freedom, responsibility and integrity
How to setup 11g active dataguard
26 Tuesday JAN 2010
POSTED BY ILANGGOH IN ORACLE
≈ 1 COMMENT
active dataguard, active dataguard 11g, dataguard 11g, snaphost standby database
Main advantage of 11g dataguard is
Ability to open the standby database in read-only mode while the database is still in managed
recovery mode. This means 11g active dataguard database is bi-functional, provides disaster recovery
and at the same time can be used for reporting purpose
Able to open standby database in read-write. This is very useful to turn our standby database into
application testing / development purposes. This is achieved through snapshot standby database
Setting up active dataguard is very easy and straight forward. Initial steps to create active dataguard are
as same as setting up 10g dataguard. The steps are almost similar with only few different commands. In
this scenario, I have named my production database as ‘prod’ and standby database as ‘stdby’ :
1. First of all, parameter file (with appropriate dataguard parameters) and standby control file must be
created from the production database.
2.Setup listener.ora and tnsnames.ora for connectivity between production and standby.
3. Connect to rman
rman target sys/oracle@prod auxiliary sys/oracle@stdby
4. With 11g active dataguard, 1 simple command will create standby without even backing up prod
database and placing it in a staging area.
RMAN>duplicate target database for standby from active database;
5. Standby database successfully created with the db is in mount state.
Page 1 of 6 How to setup 11g active dataguard | Oracle@Innotiive Asia
1. Let me use dataguard broker to enable active dataguard. Once setup the dataguard broker, you can see
the database configuration as below :
2. If you try to open database during this time, you will get error as below :
3. In order to open the standby database, connect to dgmrl and change the apply state.
4. Open the standby database now.
Page 2 of 6 How to setup 11g active dataguard | Oracle@Innotiive Asia
5. Re-enable the apply state so that redo transferred and applied to standby database while the database
is open for querying.
6. To disable the active dataguard, the steps are the same :
I. DGMGRL> edit database stdby set state=apply-off;
II. Shutdown the stdby database
III. Startup mount the stdby database
IV. DGMGRL> edit database stdby set state=apply-on;
Snapshot standby database
1. In order to create snapshot standby database :
standby database must be a physical standby database ◦
Flashback logging must be enabled on both production and standby database ◦
2. After enabling flashback mode, connect to dgmrl utility in the primary database :
Page 3 of 6 How to setup 11g active dataguard | Oracle@Innotiive Asia
3. Convert the physical standby to snapshot standby with a single command :
4. From now on, we can do any testing (like creating new schemas, tables and so on) on our standby
database. Please note that at this point of time, all the redo generated in our production database will be
still shipped to standby database. But it is just that not going to be applied until the database is converted
into physical standby mode.
5. Once the testing done, you can convert the snapshot standby database to physical standby with just 1
DGMGRL>convert database stdby to physical standby;
6. Note that when the above command executed
All the changed made to the snapshot standby database ( such as creating new schemas, tables) has
Page 4 of 6 How to setup 11g active dataguard | Oracle@Innotiive Asia
Previous physical standby database state is initiated ◦
Physical standby database is mounted and MRP process is initiated. MRP will apply all the logs
which was shipped yet applied during the snapshot standby database state.
7. Duration for this process is depends on few factors :
The amount of changes made to the database during the snapshot standby database state. More
changes will lead to more time to rewind the changes via flashback database option.
The amount of archived logs generated during the snapshot standby database state. More archive logs
will cause more time to apply it when the database is converted to physical standby database.
thought on “How to setup 11g active dataguard”
January 31, 2013 at 7:47 am
Very Useful ..
Blog at WordPress.com. The Chateau Theme.
About these ads
Page 5 of 6 How to setup 11g active dataguard | Oracle@Innotiive Asia
Follow “Oracle@Innotiive Asia”
Powered by WordPress.com
Page 6 of 6 How to setup 11g active dataguard | Oracle@Innotiive Asia