Difference between revisions of "Cache hit ratio"
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| Line 9: | Line 9: | ||
FROM | FROM | ||
[[pg_statio_user_tables]]; | [[pg_statio_user_tables]]; | ||
| + | |||
| + | heap_read | heap_hit | ratio | ||
| + | -------------+--------------+------------------------ | ||
| + | 37201451186 | 256244644067 | 0.87322560501639635699 | ||
| + | (1 row) | ||
heap_read | heap_hit | ratio | heap_read | heap_hit | ratio | ||
Revision as of 08:40, 10 August 2021
SELECT 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;
heap_read | heap_hit | ratio -------------+--------------+------------------------ 37201451186 | 256244644067 | 0.87322560501639635699 (1 row)
heap_read | heap_hit | ratio
-----------+----------+-------
| |
(1 row)
Related terms
See also
- SQL, NewSQL: GraphQL (2015), SQLite,
select, insert,select count, Distributed SQL, TablePlus, Cache hit ratio,pg_stat_user_tables,EXPLAIN, Index (PostgreSQL), DDL, SQL/MED, Group by, List users, SQL Injection, SQLAlchemy,CREATE USER, CREATE ROLE, EXPLAIN, ALTER DATABASE, REVOKE, NOLOCK, NOWAIT, EXISTS, Unique constraint - Databases: Database management, SQL, NoSQL, Wide column, PostgreSQL, MariaDB, MySQL, Derby DB, MongoDB, Cassandra, SQLite, HSQL2, H2, RocksDB, Microsoft SQL Server, DB2, Oracle Database, Memcached, Berkeley DB, Collation, SingleStore, Amazon Aurora, Graph database, Amazon DynamoDB, PrestoDB, Cache hit ratio, ACID, WAL, ARIES, DBMS, OLTP, OLAP, Database Schema, CockroachDB, Tables, Views, Apache Druid
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