Thread: How to know how much CPU, RAM is used by existing 1 database
Hi,
There are many databases in our production patroni cluster and it seems it is overloaded, so we decide to migrate the busiest database to a new patroni cluster.
pgwatch2 is implemented, how to know how much CPU, RAM is used by the database please? Then we can use it to prepare the new patroni cluster hardware. Thank you
Best regards
Dennis
Hi Guys,
Who can help me with this please? I researched but still no result yet, thank you
On Tue, 25 Oct 2022 at 16:30, Yi Sun <yinan81@gmail.com> wrote:
Hi,There are many databases in our production patroni cluster and it seems it is overloaded, so we decide to migrate the busiest database to a new patroni cluster.pgwatch2 is implemented, how to know how much CPU, RAM is used by the database please? Then we can use it to prepare the new patroni cluster hardware. Thank youBest regardsDennis
On Wed, Oct 26, 2022 at 11:07 AM Yi Sun <yinan81@gmail.com> wrote:
Hi Guys,Who can help me with this please? I researched but still no result yet, thank youOn Tue, 25 Oct 2022 at 16:30, Yi Sun <yinan81@gmail.com> wrote:Hi,There are many databases in our production patroni cluster and it seems it is overloaded, so we decide to migrate the busiest database to a new patroni cluster.pgwatch2 is implemented, how to know how much CPU, RAM is used by the database please? Then we can use it to prepare the new patroni cluster hardware. Thank youBest regardsDennis
except min_dynamic_shared_memory (integer)all other parameters are used to cap the memory. almost all parameters mentioned "database server" which means it's on cluster level.
I recommend David Deutsch's <<The Beginning of Infinity>>
Jian
On Wed, 26 Oct 2022 at 18:10, jian he <jian.universality@gmail.com> wrote:
On Wed, Oct 26, 2022 at 11:07 AM Yi Sun <yinan81@gmail.com> wrote:Hi Guys,Who can help me with this please? I researched but still no result yet, thank youOn Tue, 25 Oct 2022 at 16:30, Yi Sun <yinan81@gmail.com> wrote:Hi,There are many databases in our production patroni cluster and it seems it is overloaded, so we decide to migrate the busiest database to a new patroni cluster.pgwatch2 is implemented, how to know how much CPU, RAM is used by the database please? Then we can use it to prepare the new patroni cluster hardware. Thank youBest regardsDennis--exceptmin_dynamic_shared_memory(integer)all other parameters are used to cap the memory. almost all parameters mentioned "database server" which means it's on cluster level.
Hi Jian he
Thank you for your reply
The parameters are on cluster level, so we still can not know how much memory is used in a specific database, for example, total memory is 64GB
1. How to get how much memory is used on cluster level? For example 40GB
2. How to get how much memory is used in a specific database? For example 30GB, then we can prepare the new patroni cluster 32GB is enough
Thank you
Dennis
On 10/26/22 08:26, Yi Sun wrote:
You can see connection with pg*backend* functions. You can log connections to see which db is most commonly accessed. You can log sql to see which table are being touched. You'll have to assume a correlation to CPU/disc usage. What have you tried?On Wed, 26 Oct 2022 at 18:10, jian he <jian.universality@gmail.com> wrote:On Wed, Oct 26, 2022 at 11:07 AM Yi Sun <yinan81@gmail.com> wrote:Hi Guys,Who can help me with this please? I researched but still no result yet, thank youOn Tue, 25 Oct 2022 at 16:30, Yi Sun <yinan81@gmail.com> wrote:Hi,There are many databases in our production patroni cluster and it seems it is overloaded, so we decide to migrate the busiest database to a new patroni cluster.pgwatch2 is implemented, how to know how much CPU, RAM is used by the database please? Then we can use it to prepare the new patroni cluster hardware. Thank youBest regardsDennis--exceptmin_dynamic_shared_memory(integer)all other parameters are used to cap the memory. almost all parameters mentioned "database server" which means it's on cluster level.
I hope the below link helps... https://www.enterprisedb.com/blog/monitor-cpu-and-memory-percentage-used-each-process-postgresqlppas-91 On 10/26/22, Rob Sargent <robjsargent@gmail.com> wrote: > On 10/26/22 08:26, Yi Sun wrote: >> >> >> On Wed, 26 Oct 2022 at 18:10, jian he <jian.universality@gmail.com> >> wrote: >> >> >> >> On Wed, Oct 26, 2022 at 11:07 AM Yi Sun <yinan81@gmail.com> wrote: >> >> Hi Guys, >> >> Who can help me with this please? I researched but still no >> result yet, thank you >> >> On Tue, 25 Oct 2022 at 16:30, Yi Sun <yinan81@gmail.com> wrote: >> >> Hi, >> >> There are many databases in our production patroni cluster >> and it seems it is overloaded, so we decide to migrate the >> busiest database to a new patroni cluster. >> >> pgwatch2 is implemented, how to know how much CPU, RAM is >> used by the database please? Then we can use it to prepare >> the new patroni cluster hardware. Thank you >> >> Best regards >> Dennis >> >> >> manual: >> https://www.postgresql.org/docs/current/runtime-config-resource.html| >> | >> |except |min_dynamic_shared_memory| (|integer|)| >> |all other parameters are used to cap the memory. almost all >> parameters mentioned "database server" which means it's on cluster >> level. >> | >> | >> | >> | >> | >> -- >> I recommend David Deutsch's <<The Beginning of Infinity>> >> >> Jian >> >> >> >> Hi Jian he >> >> Thank you for your reply >> >> The parameters are on cluster level, so we still can not know how much >> memory is used in a specific database, for example, total memory is 64GB >> 1. How to get how much memory is used on cluster level? For example 40GB >> 2. How to get how much memory is used in a specific database? For >> example 30GB, then we can prepare the new patroni cluster 32GB is enough >> >> Thank you >> Dennis > You can see connection with pg*backend* functions. You can log > connections to see which db is most commonly accessed. You can log sql > to see which table are being touched. You'll have to assume a > correlation to CPU/disc usage. What have you tried?
On Wed, 2022-10-26 at 13:37 +0800, Yi Sun wrote: > Who can help me with this please? I researched but still no result yet, thank you > > On Tue, 25 Oct 2022 at 16:30, Yi Sun <yinan81@gmail.com> wrote: > > Hi, > > > > There are many databases in our production patroni cluster and it seems it is overloaded, > > so we decide to migrate the busiest database to a new patroni cluster. > > > > pgwatch2 is implemented, how to know how much CPU, RAM is used by the database please? > > Then we can use it to prepare the new patroni cluster hardware. Thank you You can look how much *private* memory the backends for a certain database use by examining /proc/<pid>/smaps, you can use the pg_buffercache extension to see how much of which database is in cache, but you don't know how much of the kernel page cache is used to cache files for that database. Yours, Laurenz Albe