move database without downtime

[Octavian Covalschi]

Hello,

Is %subj% even possible?  I know about copyDatabase command, but that requires to switch application to read-only, however I was wondering if there is an approach to make it fully functional(with writes) or with as little read only mode time as possible.

Thank you in advance.

[gregor]

mongodump --oplog is probably what you are looking for 

http://www.mongodb.org/display/DOCS/Backups

[Octavian Covalschi]

Thank you, I see how this could help me, but I'd like to move a database between different mongod instances, that are not replicated between them... my issues is that during mongdump/mongorestore I will have more writes to the old database, and I'm not sure how to handle that without any downtime.

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[gregor]

mongodump --oplog 

mongorestore 
then mongooplog to bring the new database in sync with the old database - the writes that too place during the dump/restore.

http://docs.mongodb.org/manual/reference/mongooplog/

the oplog is idempotent so you can reply older entries in safety 

[gregor]

mongorestore --oplogReplay

[Octavian Covalschi]

Thanks a lot! I'll give it a try.

[gregor]

sweet :) 

have fun!