postgresql - Postgres restore from WAL files without having a basebackup using pg_basebackup -

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i have following situation.

  • have master/replica setup.
  • somehow database dropped , new database same name created django. in case, wal files of previous database still there?
  • i have not created backup using of previous database using tool pg_basebackup, have wal files in pg_xlog.

now, trying following: - shutdown postgres server. - use recovery.conf file in pgdata (/var/lib/postgresql/9.3/main) directory , entering following in there:

    restore_command = 'cp /var/lib/postgresql/9.3/main/pg_xlog_backup_jan072016/%f %p'     recovery_target_time = '2016-01-07 03:00:00'

- startup postgres server again.

what see in log file is:

postgres:~/9.3/main/pg_log$ tail -100f postgresql-2016-01-07_170256.log 2016-01-07 17:02:56 utc log:  database system shut down @ 2016-01-07 17:02:55 utc 2016-01-07 17:02:56 utc log:  starting point-in-time recovery 2016-01-06 00:00:00+00 cp: cannot stat ‘/var/lib/postgresql/9.3/main/pg_xlog_backup_jan072016/0000000a.history’: no such file or directory cp: cannot stat ‘/var/lib/postgresql/9.3/main/pg_xlog_backup_jan072016/0000000a00000000000000cc’: no such file or directory 2016-01-07 17:02:56 utc log:  consistent recovery state reached @ 0/cc000090 2016-01-07 17:02:56 utc log:  record 0 length @ 0/cc000090 2016-01-07 17:02:56 utc log:  redo not required 2016-01-07 17:02:56 utc log:  database system ready accept read connections cp: cannot stat ‘/var/lib/postgresql/9.3/main/pg_xlog_backup_jan072016/0000000a00000000000000cc’: no such file or directory cp: cannot stat ‘/var/lib/postgresql/9.3/main/pg_xlog_backup_jan072016/0000000b.history’: no such file or directory 2016-01-07 17:02:56 utc log:  selected new timeline id: 11 cp: cannot stat ‘/var/lib/postgresql/9.3/main/pg_xlog_backup_jan072016/0000000a.history’: no such file or directory 2016-01-07 17:02:57 utc log:  archive recovery complete 2016-01-07 17:02:57 utc log:  autovacuum launcher started 2016-01-07 17:02:57 utc log:  database system ready accept connections 2016-01-07 17:02:57 utc log:  incomplete startup packet

my pg_xlog_backup_jan072016 folder has foll content.:

:~/9.3/main/pg_xlog_backup_jan072016$ ls -larth  total 161m -rw-------  1 postgres postgres  257 jan  7 15:57 00000007.history -rw-------  1 postgres postgres  16m jan  7 15:57 0000000700000000000000ca -rw-------  1 postgres postgres  16m jan  7 15:57 0000000700000000000000c9 -rw-------  1 postgres postgres  16m jan  7 15:57 0000000700000000000000c8 -rw-------  1 postgres postgres  16m jan  7 15:57 0000000700000000000000c7 -rw-------  1 postgres postgres  16m jan  7 15:57 0000000700000000000000c6 -rw-------  1 postgres postgres  16m jan  7 15:57 0000000700000000000000c5 -rw-------  1 postgres postgres  16m jan  7 15:57 0000000700000000000000c4 -rw-------  1 postgres postgres  16m jan  7 15:57 0000000700000000000000c3 -rw-------  1 postgres postgres  16m jan  7 15:57 0000000700000000000000c2 -rw-------  1 postgres postgres  16m jan  7 15:57 0000000700000000000000c1 -rw-------  1 postgres postgres  298 jan  7 15:57 00000007000000000000005d.00000028.backup -rw-------  1 postgres postgres  214 jan  7 15:57 00000006.history -rw-------  1 postgres postgres  171 jan  7 15:57 00000005.history drwx------  3 postgres postgres 4.0k jan  7 16:54 . drwx------ 18 postgres postgres 4.0k jan  7 17:02 .. drwx------  2 postgres postgres 4.0k jan  7 17:08 archive_status

the thing trying figure out is:

  • is possible restore wal without have backup pg_basebackup command? trying restore wal in existing postgres installation.
  • why log cannot find 0000000a.history , 0000000a00000000000000cc files? folder not contain such files.

can this? thanks. sarthak


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