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Create Trigger, when new table is created in Oracle DB

Posted on 2010-09-08
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Last Modified: 2013-12-19
Hi Experts,

Want to create a trigger, when a new table (here the table is created dynamically,assume it is XXABC1)created in Oracle DB1. And need to insert the records from this table XXABC1 into another DB2 table (say XXPQR@DB2).
Something like INSERT INTO XXPQR@DB2 (select * from XXABC1)

Please do the needful.

Thanks.
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Question by:amutallibkhan
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Expert Comment

by:Naveen Kumar
Comment Utility
setup an AFTER INSERT TRIGGER for the table XXABC1 in database DB1 to insert into XXPQR table in DB2 database.

Have a database link created with sample name as "dblink_db2"

create or replace trigger after_ins_xxabc1 after insert on xxabc1
for each row
begin
-- if you want anything else to be done.. you can add here...
insert into xxpqr@dblink_db2 values(:new.col1, :new.col2,:new.col3 );
commit;
end;
/

Thanks
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Expert Comment

by:Naveen Kumar
Comment Utility
what are you trying to do ? can you explain in more details so there could be a better approach than this..
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Expert Comment

by:Guy Hengel [angelIII / a3]
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I understand you want a DDL trigger (AFTER CREATE) to check if a table was created, and run a CREATE TRIGGER with that table name :http://psoug.org/reference/ddl_trigger.html
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Author Comment

by:amutallibkhan
Comment Utility
Scenario:

I have a DB1, where the new tables created on daily basis.
I have another DB2, where I have a fixed table XXABC.

Need to do is, whenever the new table gets created in DB1, then the new table data should be pushed into DB2 fixed table XXABC.

Hope you got it clear.
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Expert Comment

by:Naveen Kumar
Comment Utility
understood.

does your new table everyday gets created with data ? or data gets inserted into it after it gets created ? can you please be more precise so that we can clearly understand.
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Author Comment

by:amutallibkhan
Comment Utility
I'm sorry, missed one point.

Actually the new Table is created monthly once, not daily wise, to capture the monthly transactions. Like SEP10ABC. Later the data is inserted.
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Expert Comment

by:Naveen Kumar
Comment Utility
so this is the information which is required for us to understand. Do you want your fixed table to be populated in the DB2 immediately after each row gets inserted into this monthly table or during the night time or at a fixed time ?

Thanks
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Expert Comment

by:Naveen Kumar
Comment Utility
i mean can we populate the data into DB2 immediately or should we do it every day night or every 1 hour or at the month end ?
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Author Comment

by:amutallibkhan
Comment Utility
Anytime..no specific time.(Night time preferable)
But the data should be pushed finally.
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Expert Comment

by:Naveen Kumar
Comment Utility
then trigger is not the right stuff here.. just have a sql script scheduled which can insert the data into that fixed table in DB2 everytime ( some time say 10:30 PM everyday ) from the new table.

note:
1) the sql script should identify what data it need to insert. it should not duplicate.
2) use dbms_job/dbms_scheduler or unix script to automate the job.

Thanks
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Expert Comment

by:Naveen Kumar
Comment Utility
if you use a trigger to populate the fixed table, that would degrade the performance of the transactions related to the new table if that is going to be used by  other processes/users/transactions. Thanks,
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Author Comment

by:amutallibkhan
Comment Utility
Just give couple of mins.. i can give more details after discussing with USER.
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Accepted Solution

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POracle earned 500 total points
Comment Utility
You can go with DDL trigger.
Benefit :
->Trigger will take care about consistency between two table reside in different database. means Trigger will ensure that when record insert in one table it will propagate to another table. if it fail to insert into DB2 then whole transaction will be rollback.
->Require less intervention from your side.

Drawbacks:
->May slow down your insert, but this is depend on your environment.

Another way:-

Create partition table on DB2.
insert data in table@db1
move data from db1 to db2 using exchange partition.

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Author Closing Comment

by:amutallibkhan
Comment Utility
Thanks.
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