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My question regards PostgreSQL database size.

How can I create new database with fixed size? (e.g. 5 GB)

Once I have created fixed sized PostgreSQL database, how can I resize it ?

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    It sounds like you want database quotas. If so, PostgreSQL doesn't support them. You can create the database on a file system limited to the desired size, but MVCC and write-ahead logging will mean it won't work how you expect. The short version is "you can't". – Craig Ringer May 6 '14 at 4:23
  • @CraigRinger how about putting the (default) tablespace on a restricted-size volume? This, at least, would remove the WAL from the equation. – dezso May 6 '14 at 7:09
  • Yeah, but the whole cluster will stop until you free some space, and you can't free space without adding more space first. So it's not going to work well. – Craig Ringer May 6 '14 at 7:18
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As we can read in the comments, there is no direct support in postgresql for this - but you can solve this problem with indirect means, as you can read here: http://bytes.com/topic/postgresql/answers/421532-database-size-limiting

Basically, you have various options to make a separate database instance, or a cluster node, or a partition, and then limit the disk usage on the OS level (f.e. user quotas).

AFAIK in case of a quota exhaust your transactions will be rollbacked, but the db left consistent. But I suggest to doublecheck this before you do some dangerous.

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