On Thu, Jan 20, 2022 at 4:50 PM Lugosi, Jim <jim...@clackamas.us> wrote: > > Hi folks, > > > > We are struggling to figure out what is going on. We are migrating from > PostgreSQL 9.6 to PostgreSQL 13 w/ PostGIS. Our 9.6 version was compiled from > source and the new version (13) was installed using Yum. BTW, the new version > is on a VM that has 16GB of memory, two cores, and 500 GB of disk. In > addition, we are using MapServer as our mapping engine and OpenLayers as the > client side interface. Once we switch over to the new version of PostgreSQL, > the performance takes a big nose dive. We have being tweaking and tuning the > database and it appears to be happy but the response times from mapfile > requests are 3 -7 seconds. Previously, the response time was below a second.
please post EXPLAIN ANALYZE for a query that you think is underperforming. Ideally, we can also produce from legacy 9.6 equivalent. merlin
