Hello,
You could use Filsystem quotas but I strongly suggest against it as it will probably bring about database corruption.
Ah - manual reference http://www.postgresql.org/docs/current/static/disk-full.html
"24.2. Disk Full Failure
The most important disk monitoring task of a database administrator is to make sure the disk doesn't grow full. A filled data disk may result in subsequent corruption of database indexes, but not of the tables themselves. If the WAL files are on the same disk (as is the case for a default configuration) then a filled disk during database initialization may result in corrupted or incomplete WAL files. This failure condition is detected and the database server will refuse to start up. "
-- Richard Huxton Archonet Ltd
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