mysql partial restore from backup

Question

Due to a server crash I need to restore some rows, created within a certain period of time, from the backup (located on my local machine) onto the live db on server.

To select the rows in question I plan to do something like this from the backupdatabase:

SELECT *
FROM access AS t1
WHERE AccessId IN (
SELECT AccessId FROM access_completed AS t1
WHERE (TIMEDIFF(CCompleteDateTime, "2011-01-24 02:00:00") < 23 AND TIMEDIFF(CCompleteDateTime, "2011-01-24 02:00:00") > 0)
)

How do I insert the resulting rows into the live db?

Answer 1

You can use SELECT ... INTO OUTFILE on the backup and LOAD DATA INFILE to load data.

INTO OUTFILE dumps the selected data to a local file, in a format that MySQL can parse back using LOAD DATA INFILE . So you just have to dump and load like this:

SELECT * FROM [rest of your query] INTO OUTFILE '/tmp/outfile'

Copy outfile to the other server

And on the other server:

LOAD DATA INFILE /tmp/outfile' INTO TABLE access;

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It would also work with FEDERATED tables. This would allow to query the backup database from the main server; so you could do INSERT INTO access ... SELECT ... FROM federated_access ... .