On Thursday 13 November 2003 10.41, nm wrote: > Hi there > > I have a question regarding replication. > This is the situation: > > Mysql-Max4.0.16 > > 192.168.0.10 master > 192.168.0.11 slave > > I would like to use the slave as the backup server > and use it in case the master goes down for any reason. > I'm looking for a safe method to re-update the master when we take it up > again.
You need a way to "resume operation" in case your master dies, correct? > I was considering a simple dump of the database on slave, > when I have to reconnect the master server. You should regularly do backups from your slave. Sounds like you're a slave short, what if your master burns up in flames while you are doing the dump from your slave? > I would: > > 1. disconnect the slave Since the master just "went down" your slave would already be disconnected. > 2. create a dump file form salve Consider which of your hosts have the most "correct" data after a crash. > 3. put the dump on the master Put an exact copy of the dump on all nodes (master(s) and slave(s)) > 4. reconnect the master and slave also clear the master bin-logs from the master, and the index files. do the same for the slaves: clear out following files from your "new" slave(s): master.info all relay-log files (index, *.bin) This way the master will start at bin-log 001 at position 4. And the slave(s) will start reading from the 'first' position from the master. I know, position 4 == first looks weird but that's just the way it is. > Questions are.. > > a. I use innodb tables. Any problems to nofify? I have so far recovered ok with innodb tables, anyone else are welcome to comment. > b. Are auto_increment values correct/safe after such operations. I guess so > but I'm not 100% sure if you start over with the exact same snapshot on all nodes you should be ok. > c. Do you have comments and suggestions regarding 2-ways replications tricky... as Jeremy Zawodny said in a previous thread: "it's a race condition" with primary keys etc. http://www.mysql.com/doc/en/Replication_FAQ.html These are just some primary hints, corrections are welcome. Mikael -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
