On 2/23/15 5:39 AM, Saurabh Gupta A wrote:
Hello, Has anybody used online backup feature of postgreSQL? In fact precise postgreSQL term is called: "Point-in-time Recovery" (PITR) This means enabling following additional options in config: --- archive_command = on archive_command = 'cp %p /usr/local/pgsql/pgDataPITR/wals/%f' # This is only example path --- If yes then may I know how it is used and how it impacts database performance?
Other than the overhead of the copy itself, it generally doesn't. There are a very limited number of shortcuts we can take when wal_level is set to minimal, such as not WAL logging the full contents of data inserted into a table that was created/truncated in the same transaction, but generally archiving doesn't impact performance (assuming you keep it running correctly so pg_xlog doesn't fill up ;)
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