- Pg postgres app rails how to#
- Pg postgres app rails update#
Total number of transactions executed / throughput 12.
Pg postgres app rails update#
Find out the insert / update / delete ratio for your database. Out rows fetched vs returned by queries to the database Samay Sharma | RailsConf 2019 Uses for pg_stat_database. Samay Sharma | RailsConf 2019 Pg_stat_database select * from pg_stat_database. Or, you actually have less resources and you need to scale out with Citus. Maybe you have a lot of unused indexes. Maybe your queries are not optimized and you are doing a lot of sequential scans. Maybe autovacuum is not tuned well enough. Hit ratio is low, that could mean a lot of things. Samay Sharma | RailsConf 2019 Digging further. Where relname = 'tbl' -+- relid | 19049 schemaname | public relname | tbl heap_blks_read | 44260 heap_blks_hit | 10162819 idx_blks_read | 31 idx_blks_hit | 30 toast_blks_read | toast_blks_hit | tidx_blks_read | tidx_blks_hit | 9 Samay Sharma | RailsConf 2019 pg_statio_user_tables select * from pg_statio_user_tables. Sum(heap_blks_read) as heap_read, sum(heap_blks_hit) as heap_hit, sum(heap_blks_hit) / (sum(heap_blks_hit) + sum(heap_blks_read)) as ratio FROM pg_statio_user_tables 8 Samay Sharma | RailsConf 2019 How do I measure? SELECT. 
For transactional apps, want to keep if >95%, ideally around 99%. Samay Sharma | RailsConf 2019 Cache hit ratio Īn idea of how much of your data is coming from the PostgreSQL buffercache. Your page is making 100s of database calls, you don’t know which query is slow. Your monitoring tool shows you that most of the time is going in database calls. Symptoms: Application users are seeing slow query performance. Samay Sharma | RailsConf 2019 Problem: My application is slow. Pg postgres app rails how to#
It’s important to know how to use them. Server Administrator statistics – Statistics about replication, size of database, tables, etc. Query planner statistics – Statistics used by the planner to choose the right query plan. 
Monitoring statistics – Statistics about system activity. Postgres captures, uses and exposes many statistics. Samay Sharma | RailsConf 2019 Solution: Using Postgres’ statistics. Problems you’re facing from an application perspective. Samay Sharma | RailsConf 2019 Challenge: Relating issues to the. 
Your Postgres database Samay Sharma Solutions Engineering Manager RailsConf 2019 | Minneapolis | April 2019
Samay Sharma | RailsConf 2019 Optimizing your app by understanding.
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