I thought that you only need to use the -z flag if the distribution of
the data is changing.
Jeff Frost wrote:
> On Sat, 23 Dec 2006, Benjamin Arai wrote:
>
>> The largest table in my database (30GB) has mysteriously went from
>> taking milli-seconds to perform a query to minutes. This disks are
>> fine and I have a 4GB shared_memory. Could this slow down have to do
>> with the fsm_max_pages or something else like that? I made it larger
>> but the queries still taking a long time. I do daily vacuum's but I
>> don't run it with -z or --full. I would like to avoid doing a --full
>> if possible because it would literally take over a week to complete.
>> Any help would be greatly appreciated.
>
> Benjamin,
>
> When is the last time you ran ANALYZE? That's what the -z option
> does. If you're only vacuuming once daily, you should definitely
> analyze with the -z flag as well.
>