On Thursday, April 21, 2011 8:33:45 am Florian Weimer wrote: > * Greg Smith: > > The fact that every row update can temporarily use more than 8K means > > that actual write throughput on the WAL can be shockingly large. The > > smallest customer I work with regularly has a 50GB database, yet they > > write 20GB of WAL every day. You can imagine how much WAL is > > generated daily on systems with terabyte databases. > > Interesting. Is there an easy way to monitor WAL traffic in away? It > does not have to be finegrained, but it might be helpful to know if > we're doing 10 GB, 100 GB or 1 TB of WAL traffic on a particular > database, should the question of SSDs ever come up. They are found in $DATA/pg_xlog so checking the size of that directory regularly would get you the information. -- Adrian Klaver adrian.klaver@xxxxxxxxx -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
