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https://github.com/lesovsky/postgres-stats-qa

PostgreSQL activity statistics with questions and answers.
https://github.com/lesovsky/postgres-stats-qa

Last synced: 8 months ago
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PostgreSQL activity statistics with questions and answers.

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# PostgreSQL activity statistics: Questions and Answers. 



This is a list of questions which might occur during PostgreSQL administration and possible ways of how to answer on these questions.



This should be used with [pgstats.dev](https://pgstats.dev)



## Content



1. [Client Backends](https://pgstats.dev/Client%20Backends)

    - [x] what is client backend?

    - [x] how many clients connected to the server?

    - [x] how many clients connected to the database?

    - [x] how many clients connected remotely?

    - [x] what states of connected clients?

    - [x] do the connected clients use SSL?

    - [x] how much time spent by sessions?

    - [x] how many sessions were established and terminated?

    - [x] how much memory is used by backend?

    



2. [Query Planning](https://pgstats.dev/Query%20Planning)

    - [x] what is planner?

    - [x] how long queries are planned?

    - [x] what is the ratio of planning time to executing time?

    - [x] how to get plan of the query?



3. [Query Execution](https://pgstats.dev/Query%20Execution)

    - [ ] what is query executor?

    - [ ] how many queries executed on the server, database, or from specific address?

    - [ ] what queries are executed right now?

    - [ ] is there any long queries or transactions on the server?

    - [ ] what is the duration of the running xacts and queries?

    - [ ] are there any blocked activity?

    - [ ] which transactions or queries are blocked/waiting and who is blocking them?

    - [ ] what the top of wait events occurs right now?

    - [ ] how much time my functions are executed?

    - [ ] how much time my queries are executed?

    - [ ] how many times my queries have been called?

    - [ ] how much time my queries are executed?

    - [ ] how much time my queries spent doing IO?

    - [ ] how many locks and what types of locks on the server?

    - [ ] how much time waiting queries are waiting?

    - [ ] how many of specific queries are executed now? how many SELECTS, UPDATES, and so on.

    - [ ] how many CREATE INDEX opearions are running and what its progress?

    - [ ] how many CLUSTER or VACUUM FULL opearions are running and what its progress?

    - [ ] how many COPY opearions are running and what its progress?



4. [Tables Usage](https://pgstats.dev/Tables%20Usage)

    - [ ] what is tables?

    - [ ] how many tables in my database?

    - [ ] how my tables are accessed and how many rows retrieved?

    - [ ] what workload is on my tables?



5. [Indexes Usage](https://pgstats.dev/Indexes%20Usage)

    - [ ] what is the main purpose of indexes?

    - [ ] how many indexes is in my database or table?

    - [ ] how often my indexes are used?



6. [Buffers IO](https://pgstats.dev/Buffers%20IO)

    - [ ] what is buffers IO?

    - [ ] how much often my tables and indexes are read from cache?

    - [ ] what cache hit ratio of my queries?

    - [ ] how much temporary IO is produced by queries?

    - [ ] how much local IO is produced by queries?



7. [Shared Buffers](https://pgstats.dev/Shared%20Buffers)

    - [ ] what is shared buffers?

    - [ ] how much of shared buffers are used?

    - [ ] what tables and indexes are in the shared buffers?

    - [ ] how much space allocated by internal structures in the shared buffers?



8. [SLRU Caches](https://pgstats.dev/SLRU%20Caches)

    - [ ] what is SLRU cache?

    



9. [Server configuration]()

    - [ ] how Postgres server is configured?

    - [ ] how to list all configuration settings?

    - [ ] how to check for unapplied settings?

    - [ ] how to list all HBA rules?

    - [ ] how to change settings?

    - [ ] how to check when configuration was applied?



10. [Postmaster](https://pgstats.dev/Postmaster)

    - [ ] what is Postmaster?



11. [Background Workers](https://pgstats.dev/Background%20Workers)

    - [ ] what is background workers?

    - [ ] how many bg workers are running (for particular pid)?



12. [Autovacuum Launcher](https://pgstats.dev/Autovacuum%20Launcher)

    - [ ] what is autovacuum launcher?

    - [ ] what about wraparound?



13. [Autovacuum Workers](https://pgstats.dev/Autovacuum%20Workers)

    - [ ] what is autovacuum workers?

    - [ ] how many (auto)vacuum workers are running?

    - [ ] how long vacuum workers are executed?

    - [ ] what the progress of vacuum?

    - [ ] what the progress of running analyze commands?

    - [ ] what tables have to be vacuumed or analyzed?

    - [ ] how far autovacuum had on table?



14. [Write-Ahead Log](https://pgstats.dev/Write-Ahead%20Log)

    - [ ] what is Write-Ahead Log?

    - [ ] how to calculate distance between two WAL locations?

    - [ ] how to understand current state of WAL?

    - [ ] how many WAL are generated by server?

    - [ ] how many FPW are performed by server?

    - [ ] how to count number of WAL segments and its size?

    - [ ] how to find the most fresh standby server?



15. [Logger Process](https://pgstats.dev/Write-Ahead%20Log)

    - [ ] what is logger process?

    - [ ] what the current logfile and where is it?

    - [ ] how much size log files take?



16. [Stats Collector](https://pgstats.dev/Stats%20Collector)

    - [ ] what is stats collector?

    - [ ] why there is nothing about stats collector?



17. [Logical Replication](https://pgstats.dev/Logical%0AReplication)

    - [ ] what is logical replication?

    - [ ] how many replication slots are opened?

    - [ ] what the status of subscriptions?



18. [WAL Sender Process](https://pgstats.dev/WAL%20Sender%0AProcess)

    - [ ] what is WAL sender process?

    - [ ] how many standbys are connected to server?

    - [ ] how far connected standbys are left behind of master?



19. [WAL Archiver Process](https://pgstats.dev/WAL%20Archiver%0AProcess)

    - [ ] what is WAL archiver?

    - [ ] what the status of WAL archiver?

    - [ ] how much WAL segments are not archived?



20. [Background Writer Process](https://pgstats.dev/Background%0AWriter)

    - [ ] what is background writer?

    - [ ] how much amount of data written by bgwriter?

    - [ ] how much amount of data written by backends?

    - [ ] how often bgwriter has to forced to stop? 



21. [Checkpointer Process](https://pgstats.dev/Checkpointer%0AProcess)

    - [ ] what is checkpointer?

    - [ ] how much time are spent on write and sync phases?

    - [ ] how much amount of data written by checkpointer?



22. [Network](https://pgstats.dev/Network)

    - [ ] how network is used in cluster topology?



23. [WAL Receiver Process](https://pgstats.dev/WAL%20Receiver%20Process)

    - [ ] what is wal receiver process?

    - [ ] how much data recevied by wal receiver?



24. [Recovery Process](https://pgstats.dev/Recovery%20Process)

    - [ ] what is recovery process?

    - [ ] what the latest WAL location or transaction is replayed?

    - [ ] what is the state of recovery?



25. [Storage](https://pgstats.dev/Storage)

    - [ ] how storage is used by Postgres server?

    - [ ] where Postgres stores its data (WAL, logs, TS, etc)?



26. [Tables and Indexes Data Files](https://pgstats.dev/Tables%2FIndexes%20Data%20Files)

    - [ ] what the size of my Postgres?

    - [ ] what the size of my databases?

    - [ ] what the size of my tables?

    - [ ] what the size of my indexes?

    - [ ] what the size of temporary files?