Re: Do table-level CHECK constraints affect the query optimizer?

On 6/29/21 12:46 PM, Tom Lane wrote:
> Ron <ronljohnsonjr@gmail.com> writes:
>> On 6/29/21 11:42 AM, Tom Lane wrote:
>>> If there's a significant difference in relallvisible fractions, that
>>> would point to something different in your VACUUM housekeeping on
>>> the two systems.
>> Prod is brand new.  Loaded on Saturday; we saw this problem on Sunday during
>> pre-acceptance.  Thus, while running ANALYZE was top of the list of Things
>> To Do, running VACUUM was low.
>> Is that a mistaken belief?
> ANALYZE won't update relallvisible AFAIR, while VACUUM will.
> So if you are depending on lots of IOS, you need a round of
> vacuuming.

What's an IOS?

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