From: | PG Bug reporting form <noreply(at)postgresql(dot)org> |
---|---|
To: | pgsql-bugs(at)lists(dot)postgresql(dot)org |
Cc: | ap(at)zip(dot)com(dot)au |
Subject: | BUG #15427: DROP INDEX did not free up disk space |
Date: | 2018-10-12 03:27:28 |
Message-ID: | 15427-d5b9573b9e5bdf29@postgresql.org |
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Lists: | pgsql-bugs |
The following bug has been logged on the website:
Bug reference: 15427
Logged by: Andrew P
Email address: ap(at)zip(dot)com(dot)au
PostgreSQL version: 10.5
Operating system: Debian Sarge (9)
Description:
Performed a DROP INDEX to free up disk space but, whilst the command
succeeded the disk space was not freed up.
The index was:
CREATE INDEX radlelink_rlreid_idx ON radlelink (rlid, reid);
Config of table:
CREATE TABLE radlelink (
rlid BIGINT REFERENCES radlogins (id) ON DELETE
CASCADE,
reid BIGINT REFERENCES radextra (id) ON DELETE CASCADE
);
Ran 'lsof -nP +L1' on the server as per suggestion on postgresql irc channel
and this was the (abridged output):
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NLINK NODE NAME
postgres 2633 postgres 197u REG 252,5 16777216 0 3410028
/var/lib/postgresql/10/main/pg_wal/00000001000003960000006E (deleted)
postgres 2633 postgres 325u REG 252,5 0 0 3409445
/var/lib/postgresql/10/main/base/16562/17437 (deleted)
postgres 2633 postgres 326u REG 252,5 1073741824 0 3409702
/var/lib/postgresql/10/main/base/16562/17437.1 (deleted)
postgres 2633 postgres 327u REG 252,5 1073741824 0 3409704
/var/lib/postgresql/10/main/base/16562/17437.2 (deleted)
postgres 2633 postgres 328u REG 252,5 1073741824 0 3409705
/var/lib/postgresql/10/main/base/16562/17437.3 (deleted)
postgres 2633 postgres 329u REG 252,5 1073741824 0 3409452
/var/lib/postgresql/10/main/base/16562/17437.4 (deleted)
postgres 2633 postgres 330u REG 252,5 1073741824 0 3409709
/var/lib/postgresql/10/main/base/16562/17437.5 (deleted)
postgres 2633 postgres 331u REG 252,5 1073741824 0 3409710
/var/lib/postgresql/10/main/base/16562/17437.6 (deleted)
postgres 2633 postgres 332u REG 252,5 1073741824 0 3409706
/var/lib/postgresql/10/main/base/16562/17437.7 (deleted)
postgres 2633 postgres 333u REG 252,5 1073741824 0 3409722
/var/lib/postgresql/10/main/base/16562/17437.8 (deleted)
postgres 2633 postgres 334u REG 252,5 1073741824 0 3409724
/var/lib/postgresql/10/main/base/16562/17437.9 (deleted)
postgres 2633 postgres 335u REG 252,5 1073741824 0 3409716
/var/lib/postgresql/10/main/base/16562/17437.10 (deleted)
...
postgres 2633 postgres 403u REG 252,5 1073741824 0 3409970
/var/lib/postgresql/10/main/base/16562/17437.78 (deleted)
postgres 2633 postgres 404u REG 252,5 1073741824 0 3409976
/var/lib/postgresql/10/main/base/16562/17437.79 (deleted)
postgres 2633 postgres 405u REG 252,5 1073741824 0 3409969
/var/lib/postgresql/10/main/base/16562/17437.80 (deleted)
postgres 2633 postgres 406u REG 252,5 1073741824 0 3409983
/var/lib/postgresql/10/main/base/16562/17437.81 (deleted)
postgres 2633 postgres 407u REG 252,5 1073741824 0 3409984
/var/lib/postgresql/10/main/base/16562/17437.82 (deleted)
postgres 2633 postgres 408u REG 252,5 1073741824 0 3409981
/var/lib/postgresql/10/main/base/16562/17437.83 (deleted)
postgres 2633 postgres 409u REG 252,5 1073741824 0 3410002
/var/lib/postgresql/10/main/base/16562/17437.84 (deleted)
postgres 2633 postgres 410u REG 252,5 1073741824 0 3410012
/var/lib/postgresql/10/main/base/16562/17437.85 (deleted)
postgres 2633 postgres 411u REG 252,5 1073741824 0 3409991
/var/lib/postgresql/10/main/base/16562/17437.86 (deleted)
postgres 2633 postgres 412u REG 252,5 1073741824 0 3410025
/var/lib/postgresql/10/main/base/16562/17437.87 (deleted)
postgres 2633 postgres 413u REG 252,5 264241152 0 3410026
/var/lib/postgresql/10/main/base/16562/17437.88 (deleted)
PID 2633 was:
postgres 2633 12.5 0.4 305868 158632 ? Ss Oct09 544:04 postgres:
10/main: postgres radlogs [local] idle
I executed 'SELECT 1;' in that session (it was a psql session) and 5s later
it returned, the files were closed and the disk space freed.
There were also two autovacuum processes up at the time:
postgres 29102 2.4 0.2 355320 76724 ? Ss 13:09 0:45 postgres:
10/main: autovacuum worker process radlogs
postgres 29378 16.0 0.1 355312 37976 ? Ss 13:40 0:00 postgres:
10/main: autovacuum worker process radlogs
Hope this helps.
AP
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Next Message | Andres Freund | 2018-10-12 03:37:14 | Re: BUG #15427: DROP INDEX did not free up disk space |
Previous Message | Alvaro Herrera | 2018-10-11 22:09:02 | Re: BUG #15425: DETACH/ATTACH PARTITION bug |