Jean-Gerard,

> The classic output from top (during all other index vacuum):
>    PID    UID   PRI NICE  SIZE   RES STATE WAIT     TIME    CPU COMMAND
> 20461    503    14    0   13M   75M sleep semwai   5:27  2.05% postgres
>
> When backend hits the tsearch2 index, SIZE/RES grows until it reachs
> 1GB, where I got the error.
>    PID    UID   PRI NICE  SIZE   RES STATE WAIT     TIME    CPU COMMAND
> 20461    503    -5    0  765M  824M sleep biowai   4:26 33.20% postgres

OK, next thing to try is upgrading to 7.4.7.   Since you have 7.4.2, this 
should be a straightforward binary replacement.

-- 
--Josh

Josh Berkus
Aglio Database Solutions
San Francisco

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