Hi Michael,
Problem for this variant: merge table has to be dropped and recreated
periodically.
during the short lag interval the log merge table
does not exist
You don't have to drop and re-create the table. Please don't edit the MRG file directly either.
You can accomplish this easily by using the ALTER TABLE statement:
CREATE TABLE t1 (id INT NOT NULL, c CHAR(10) NOT NULL, PRIMARY KEY(id)); CREATE TABLE t2 (id INT NOT NULL, c CHAR(10) NOT NULL, PRIMARY KEY(id));
CREATE TABLE t_merge (id INT NOT NULL, c CHAR(10) NOT NULL, KEY(id)) TYPE=MERGE UNION=(t1, t2);
So now you have a MERGE table containing both tables. If you want to add a third one later:
CREATE TABLE t3 (id INT NOT NULL, c CHAR(10) NOT NULL, PRIMARY KEY(id));
ALTER TABLE t_merge UNION=(t1, t2, t3);
Using ALTER TABLE with a MERGE table is an atomic operation and can be done while the server is up and running full-speed without any problems.
Regards,
Jeremy
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