Re: Possible Corrputed shared memory

James Sebastian <james.sebastian@gmail.com> writes:
> On 1 August 2015 at 20:10, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> [ scratches head... ] It should certainly not have taken very long to
>> replay 10 WAL segments worth of data.  I surmise that the problems
>> you were having before the shutdown were worse than you thought, ie
>> checkpoints were failing to complete, probably due to a persistent
>> I/O error, so that there was a whole lot more than normal to replay
>> after the last successful checkpoint.  Is there any evidence of such
>> distress in the postmaster log?

> We had very slow application performance and many hanging threads as per
> pgadmin -> server status
> Also logs had the following which also indicating probably high I/O (as per
> google search results)

> 2015-07-30 10:10:21 IST WARNING:  pgstat wait timeout
> 2015-07-30 10:12:21 IST WARNING:  pgstat wait timeout

Well, those might mean problems with the stats collector subprocess, but
that's pretty noncritical; it would certainly not have prevented
checkpoints from completing.  No other unexplained log entries?

            regards, tom lane