Re: How to prevent master server crash if hot standby stops

Hi!

>If you prefer replication to fail silently, don't use replication
>slots. Use "wal_keep_segments" instead.

I desided to give 1 GB to wal. So I added

wal_keep_segments=60

After some time Postgres created 80 files with total size 1.3GB.

How to fix this so that no more than 1 GB of disk space is used ?
How to get information how may wal files are yet not processed by slave ?
How to delete processed wal files so that 1 GB of disk space can used for some other purposes ?

/var/lib/postgresql/12/main/pg_wal# ls
00000001000002A200000072 00000001000002A200000083 00000001000002A200000094 00000001000002A2000000A5 00000001000002A2000000B6
00000001000002A200000073 00000001000002A200000084 00000001000002A200000095 00000001000002A2000000A6 00000001000002A2000000B7
00000001000002A200000074 00000001000002A200000085 00000001000002A200000096 00000001000002A2000000A7 00000001000002A2000000B8
00000001000002A200000075 00000001000002A200000086 00000001000002A200000097 00000001000002A2000000A8 00000001000002A2000000B9
00000001000002A200000076 00000001000002A200000087 00000001000002A200000098 00000001000002A2000000A9 00000001000002A2000000BA
00000001000002A200000077 00000001000002A200000088 00000001000002A200000099 00000001000002A2000000AA 00000001000002A2000000BB
00000001000002A200000078 00000001000002A200000089 00000001000002A20000009A 00000001000002A2000000AB 00000001000002A2000000BC
00000001000002A200000079 00000001000002A20000008A 00000001000002A20000009B 00000001000002A2000000AC 00000001000002A2000000BD
00000001000002A20000007A 00000001000002A20000008B 00000001000002A20000009C 00000001000002A2000000AD 00000001000002A2000000BE
00000001000002A20000007B 00000001000002A20000008C 00000001000002A20000009D 00000001000002A2000000AE 00000001000002A2000000BF
00000001000002A20000007C 00000001000002A20000008D 00000001000002A20000009E 00000001000002A2000000AF 00000001000002A2000000C0
00000001000002A20000007D 00000001000002A20000008E 00000001000002A20000009F 00000001000002A2000000B0 00000001000002A2000000C1
00000001000002A20000007E 00000001000002A20000008F 00000001000002A2000000A0 00000001000002A2000000B1 archive_status
00000001000002A20000007F 00000001000002A200000090 00000001000002A2000000A1 00000001000002A2000000B2
00000001000002A200000080 00000001000002A200000091 00000001000002A2000000A2 00000001000002A2000000B3
00000001000002A200000081 00000001000002A200000092 00000001000002A2000000A3 00000001000002A2000000B4
00000001000002A200000082 00000001000002A200000093 00000001000002A2000000A4 00000001000002A2000000B5

Andrus.