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https://github.com/coderhs/postgres-utils
Collection of useful PostgreSQL queries.
https://github.com/coderhs/postgres-utils
Last synced: about 2 months ago
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Collection of useful PostgreSQL queries.
- Host: GitHub
- URL: https://github.com/coderhs/postgres-utils
- Owner: coderhs
- Created: 2017-04-03T05:43:19.000Z (almost 8 years ago)
- Default Branch: master
- Last Pushed: 2019-11-10T02:47:30.000Z (about 5 years ago)
- Last Synced: 2024-10-30T09:42:03.950Z (3 months ago)
- Size: 3.91 KB
- Stars: 2
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
## Display query which are in lock, how long they have been running
```sql
SELECT a.datname,
c.relname,
l.transactionid,
l.mode,
l.GRANTED,
a.usename,
a.query,
a.query_start,
age(now(), a.query_start) AS "age",
a.pid
FROM pg_stat_activity a
JOIN pg_locks l ON l.pid = a.pid
JOIN pg_class c ON c.oid = l.relation
ORDER BY a.query_start;
```
## Terminate a runing query
```sql
SELECT pid, age(now(), query_start) AS "age", pg_cancel_backend(pid)
FROM pg_stat_activity
WHERE query != '' AND query NOT ILIKE '%pg_stat_activity%' AND query ILIKE '%DELETE%';
```
*pg_cancel_backend* - accepts only one pid at a time. It returns true or false (if its executed or not) and it you should use
cancel for an active query.
## Find rows whose attribute with timestap has time between two time of the day.
```sql
SELECT *
FROM table_name
WHERE CAST(start_time as time) NOT BETWEEN TIME '8:30:00' AND TIME '12:30:00';
```
## Find the table (within a schema) taking maximum disk space
```sql
SELECT pg_namespace.nspname AS schema, pg_class.relname AS relation,
pg_size_pretty(pg_total_relation_size(pg_class.oid::regclass)) AS size,
COALESCE(pg_stat_user_tables.seq_scan + pg_stat_user_tables.idx_scan, 0) AS scans
FROM pg_class
LEFT JOIN pg_stat_user_tables ON pg_stat_user_tables.relid = pg_class.oid
LEFT JOIN pg_namespace ON pg_namespace.oid = pg_class.relnamespace
WHERE pg_class.relkind = 'r'::"char"
AND pg_namespace.nspname NOT IN ('pg_catalog', 'information_schema')
ORDER BY pg_total_relation_size(pg_class.oid::regclass) DESC;
```
## Create a view of all the active locks
```sql
CREATE OR REPLACE VIEW public.active_locks AS
SELECT t.schemaname,
t.relname,
l.locktype,
l.page,
l.virtualtransaction,
l.pid,
l.mode,
l.granted
FROM pg_locks l
JOIN pg_stat_all_tables t ON l.relation = t.relid
WHERE t.schemaname <> 'pg_toast'::name AND t.schemaname <> 'pg_catalog'::name
ORDER BY t.schemaname, t.relname;
```
## Get total number of DB Connections
```sql
select count(*) from pg_stat_activity;
```
## Get total DB size
```sql
SELECT pg_size_pretty(pg_database_size('DB NAME'));
```