What level suplemental logging requires to setup Streams at Schema level

Question

Hi,
Working on setting-up streams from 10g to 11g db @ schema level. And the session is hanging with statement "ALTER DATABASE ADD SUPPLEMENTAL LOG DATA" while running following command - generated using DBMS_STREAMS_ADM.MAINTAIN_SCHEMAS.
Begin
dbms_streams_adm.add_schema_rules(
schema_name => '"DPX1"',
streams_type => 'CAPTURE',
streams_name => '"CAPTURE_DPX1"',
queue_name => '"STRMADMIN"."CAPTURE_QUEUE"',
include_dml => TRUE,
include_ddl => TRUE,
include_tagged_lcr => TRUE,
source_database => 'DPX1DB',
inclusion_rule => TRUE,
and_condition => get_compatible);
END;
The generated script also setting each table with table-level logging "'ALTER TABLE "DPX1"."DEPT" ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY, FOREIGN KEY, UNIQUE INDEX) COLUMNS'".
So my question is: Is Database level supplemental logging required to setup schema-level replication? If answer is no then why the following script is invoking "ALTER DATABASE ADD SUPPLEMENTAL LOG DATA" command.
Thanks in advance.
Regards,
Sridhar

Answer 1

Hi sri dhar,
From what I found, the "ALTER DATABASE ADD SUPPLEMENTAL LOG DATA" is required for the first capture you create in a database. Once it has been run, you'll see V$DATABASE with the column SUPPLEMENTAL_LOG_DATA_MIN set to YES. It requires a strong level of locking - for example, you cannot run this alter database while an index rebuild is running (maybe an rebuild online?)
I know it is called implicitly by DBMS_STREAMS_ADM.add_table_rules for the first rule created.
So, you can just run the statement once in a maintenance window and you'll be all set.
Minimal Supplemental Logging - http://www.oracle.com/pls/db102/to_URL?remark=ranked&urlname=http:%2F%2Fdownload.oracle.com%2Fdocs%2Fcd%2FB19306_01%2Fserver.102%2Fb14215%2Flogminer.htm%23sthref2006
NOT to be confused with database level supplemental log group.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14228/mon_rep.htm#BABHHCCC
Hope this helps,
Regards,