Table purge

Question

Hi,
I have a table which is growing fast and I want to keep only 5 days worth of data. Rest of the data I want to move to a history table and purge from the original table. Any body have a script for doing this sort of work?
Thanks,
GK

Answer 1

First off, have you considered partitioning to address this problem? If you have this sort of issue on many tables in a database, I would suspect that partitioning would be the easier and more maintainable approach.
Second, you can write a stored procedure that uses dynamic SQL to do this sort of thing
CREATE PROCEDURE archive( tbl_name VARCHAR2, hist_tbl VARCHAR2, days NUMBER )
AS
  sqlStmt VARCHAR2(1000);
BEGIN
  sqlStmt := 'INSERT INTO ' || hist_tbl ||
             '  SELECT * FROM ' || tbl_name ||
             '   WHERE time_col > TRUNC(sysdate - ' || TO_CHAR(days) || ')';
  EXECUTE IMMEDIATE sqlStmt;
  sqlStmt := 'DELETE FROM ' || tbl_name ||
             ' WHERE time_col > TRUNC(sysdate - ' || TO_CHAR(days) || ')';
  EXECUTE IMMEDIATE sqlStmt;
END;Justin
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