In current cvs (as in version 7.4.5), VACUUM does not work at all in
autocommit=off mode. That is, because psql does not know that VACUUM cannot
be performed inside an transaction.

Even if you do
it will internally issue a ROLLBACK; BEGIN; VACUUM;

I consider this a bug and suggest the attached fix. is_transact_command() in
src/bin/psql/common.c is used to determine if a command is a transaction
modifying command. The diff just adds "vacuum" to those commands, so that
psql will not issue a BEGIN before a VACUUM.

Best Regards,
Michael Paesold

Attachment: psql-autocommit-vacuum.diff
Description: Binary data

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