How-to re-instantiate tables with LONG column for Oracle logical standby

To re-instantiate tables without LONG column for logical standby, we can use the dbms_logstdby.instantiate_table procedure.

SQL> exec dbms_logstdby.instantiate_table('SIEBEL','S_SRM_REQUEST','MY_DBLINK');

But the procedure didn’t support table with Long column, we can manually re-instantiate table having LONG column for logical standby:

1. Get applied scn on logical standby

SQL> alter database stop logical standby apply;

Database altered.
SQL> SELECT APPLIED_SCN FROM DBA_LOGSTDBY_PROGRESS;

APPLIED_SCN
-----------
5793495324

2. expdp using flashback_scn on primary, and copy dump files to logical standby

expdp TABLES=SIEBEL.S_SRM_REQUEST FLASHBACK_SCN=5793495324

3. impdp to logical standby

SQL> drop table SIEBEL.S_SRM_REQUEST;

Table dropped.

impdp TABLES SIEBEL.S_SRM_REQUEST

--restart logical standby apply
SQL> alter database start logical standby apply immediate;

Database altered.

4.check the data after sometime
–on logical stanby

SQL> alter database stop logical standby apply;

Database altered.

SQL> SELECT APPLIED_SCN FROM DBA_LOGSTDBY_PROGRESS;

APPLIED_SCN
-----------
5909587168

SQL> select count(*) from siebel.S_SRM_REQUEST;

COUNT(*)
----------
12495978

–on primary

SQL> select count(*) from siebel.S_SRM_REQUEST as of scn 5909587168;

COUNT(*)
----------
12495978

These steps are created based on my understanding of Oracle logical standby. I did use it for a few times but I didn’t find an official document to support this. Also I asked Oracle support whether it’s supported. They didn’t say yes, nor no. They said something like “if it works, it works”.

So using it on your own risk.

Advertisements

About Alex Zeng
I would be very happy if this blog can help you. I appreciate every honest comments. Please forgive me if I'm too busy to reply your comments in time.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: