get this warning from pgAdmin

On 11/12/2015 10:02 AM, anj patnaik wrote:

I get this warning when trying to fetch data for a postgres db. Does
this indicate a real issue? Thanks

Well it means the statistics for the table are out of touch with
reality. The database will not fall over, but your queries against the
table will be using stale statistics when the query planner sets up the
query.

Running VACUUM recommended
The estimated rowcount on the table "recorder" deviates significantly
from the actual rowcount. You should run VACUUM ANALYZE on this table.

I would take the suggestion, or you can wait till autovacuum hits the table.

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Adrian Klaver
adrian.klaver@aklaver.com

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This is not necessarily a major issue. It is simply an advisory that a
significant number of rows in the table have been inserted, updated or
deleted and that in order to have reliable statistics, a vacuum analyze
should be done.

Depending on the number of rows in the table and the difference between
actual row count and and the current statistics row count, you can decide
if you need to vacuum analyze or delay.

One rule of thumb is to consider the response time of queries against that
tablet. IOW, are DML queries involving that table completing within a
couple of seconds? If yes, you can delay a while or wait for autovacuum to
be done on that table. If the DML is taking more than a few seconds, then
yes, it is advisable to vacuum analyze it.

On Thu, Nov 12, 2015 at 1:02 PM, anj patnaik <patna73@gmail.com> wrote:

I get this warning when trying to fetch data for a postgres db. Does this
indicate a real issue? Thanks

Running VACUUM recommended
The estimated rowcount on the table "recorder" deviates significantly from
the actual rowcount. You should run VACUUM ANALYZE on this table.

--
*Melvin Davidson*
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.

2015-11-12 19:43 GMT+01:00 Adrian Klaver <adrian.klaver@aklaver.com>:

On 11/12/2015 10:02 AM, anj patnaik wrote:

I get this warning when trying to fetch data for a postgres db. Does
this indicate a real issue? Thanks

Well it means the statistics for the table are out of touch with reality.
The database will not fall over, but your queries against the table will be
using stale statistics when the query planner sets up the query.

Running VACUUM recommended
The estimated rowcount on the table "recorder" deviates significantly
from the actual rowcount. You should run VACUUM ANALYZE on this table.

I would take the suggestion, or you can wait till autovacuum hits the
table.

AFAIK, this part of the code in pgAdmin hasn't been touched since quite a
few years. You shouldn't rely on it to know which tables need a VACUUM or
an ANALYZE.

--
Guillaume.
http://blog.guillaume.lelarge.info
http://www.dalibo.com