一种追求
[权衡利弊,没有最好,只有更好]
存放索引详细信息的表
data_name=# \d+ pg_stat_user_indexes;
View "pg_catalog.pg_stat_user_indexes"
Column | Type | Modifiers | Storage | Description
---------------+--------+-----------+---------+-------------
relid | oid | | plain |
indexrelid | oid | | plain |
schemaname | name | | plain |
relname | name | | plain |
indexrelname | name | | plain |
idx_scan | bigint | | plain |
idx_tup_read | bigint | | plain |
idx_tup_fetch | bigint | | plain |
View deFinition:
SELECT pg_stat_all_indexes.relid,pg_stat_all_indexes.indexrelid,pg_stat_all_indexes.schemaname,pg_stat_all_indexes.relname,pg_stat_all_indexes.indexrelname,pg_stat_all_indexes.idx_scan,pg_stat_all_indexes.idx_tup_read,pg_stat_all_indexes.idx_tup_fetch
FROM pg_stat_all_indexes
WHERE (pg_stat_all_indexes.schemaname <> ALL (ARRAY['pg_catalog'::name,'information_schema'::name])) AND pg_stat_all_indexes.schemaname !~ '^pg_toast'::text;
通过这个表查看某个表的索引使用情况易如反掌了。
示例一、查看所有表的索引的使用情况
select relname,indexrelname,idx_scan,idx_tup_read,idx_tup_fetch from pg_stat_user_indexes order by idx_scan asc,idx_tup_read asc,idx_tup_fetch asc;
示例二、查看某个表的索引使用情况
select relname,idx_tup_fetch from pg_stat_user_indexes where relname = table_name order by idx_scan asc,idx_tup_fetch asc;
原文地址:https://www.jb51.cc/postgresql/194383.html
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