On 4/12/22 16:23, Frits Jalvingh wrote: > You might be comparing apples and pears.. > > Your Oracle is running on prem while Postgres is running on Azure. Azure > does not really have disks; it seems to have just a bunch of old people > writing the data on paper - I/O on Azure is ridiculously slow. What > disks/hardware does the on-prem Oracle have? > Right. It'd be good to do some basic system benchmarks first, e.g. using "fio" or similar tools, before comparing query timings. It's quite possible this is due to Azure storage being slower than physical drives in the on-premise system. If that does not explain this, I suggest picking a single query and focus on it, instead of investigating all queries at once. There's a nice wiki page explaining what info to provide: https://wiki.postgresql.org/wiki/Slow_Query_Questions regards -- Tomas Vondra EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
