At 03:47 PM 1/7/2016 +0000, Barry Cannon wrote:
Hello,
I am curious how many people use the koha-dump script to dump
their Koha database? I am particularly interested to know how people are
dealing with larger databases where mysqldump causes table locking.
We looked into this (not sure what your definition of "larger database" is
-- our dumps are around 670 Megs) and decided to go the hardware route
using solid state drives for both the db and the backups. End result, we
have less than 4 seconds "downtime" for a daily cron-job which (so far,
touch wood) has not given rise to any complaints.
Note that we "clean" the db before dumping, specifically sessions (with the
spiders we seem to get >100,000 / 24 hours despite blocking Baidu at the
firewall) and imports (our cataloguers can get very busy) -- the mail, logs
(we retain only 10 days) and zebraqueue appear to be less substantial --
which saves between 50 and 100 Megs.
Best -- Paul
I would typically suggest using the '--single-transaction' option but I
notice there is still one table, pending_offline_operations, that isn't
using InnoDB as it's storage engine. Best practice is to use 'lock-tables'
in this instance (mysqldump locks by default) but with a larger database
this can cause a non responsive interface for the duration of the backup.
We have sites where the one system is used by users in different time
zones, this causes a headache as "out-of-hours" doesn't exist.
LVM snapshots would be useful but prove tricky when using hosting providers.
Any suggestions would be welcome!
Regards
Barry Cannon
Interleaf Technology
http://www.interleaf.ie
Tel: +35312865855
Email: [email protected]
Skype: bar.cannon
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