Please remove me from this list Serv. I do not use this db anymore and fills my alerts daily.
On Tue, Jan 29, 2019 at 06:39 Saurabh Nanda <saurabhna...@gmail.com> wrote: > Hi, > > I'm going crazy trying to optimise my Postgres config for a production > setting [1] Once I realised random changes weren't getting my anywhere, I > finally purchased PostgreSQL 10 - Higher Performance [2] and understood the > impact of shared_buffers. > > IIUC, shared_buffers won't have any significant impact in the following > scenario, right? > > -- DB size = 30GB > -- shared_buffers = 2GB > -- workload = tpcb-like > > This is because the tpcb-like workload selects & updates random rows from > the DB [3]. Therefore, with a 2GB shared buffer, there is only a 6-7% > chance (did I get my probability correct?) that the required data will be > in the shared_buffer. Did I understand this correctly? > > If nothing else becomes the bottleneck (eg. periodically writing dirty > pages to disk), increasing the shared_buffers to 15GB+ should have a > significant impact, for this DB-size and workload, right? (The system has > 64 GB RAM) > > [1] Related thread at > https://www.postgresql.org/message-id/flat/CAPz%3D2oGdmvirLNX5kys%2BuiY7LKzCP4sTiXXob39qq6eDkEuk2Q%40mail.gmail.com > [2] > https://www.packtpub.com/big-data-and-business-intelligence/postgresql-10-high-performance > [3] https://www.postgresql.org/docs/11/pgbench.html#id-1.9.4.10.7.2 > > -- Saurabh. > -- Ethical axioms are found and tested not very differently from the axioms of science. Truth is what stands the the test if experience.
