postgresql error PANIC: could not locate a valid checkpoint record

postgreSQL 如果没有正常关闭数据库且丢失了xlog 或者说wal日志文件的话 会导致启动时出现上述错误，对于pg而言可以通过pg_resetxlog或pg_resetwal(pg 10以后)来绕过该问题，即跳过这些日志。不像在oracle中，如果是没有clean close database且丢失了acitve或current的重做日志的话，会导致oracle数据库也无法打开，且强制开库的话步骤十分复杂，要比pg困难很多。

PG中可以执行如下命令来重置日志，但是注意做这些操作之前应该对$PGDATA目录做一个tarbar备份：

2019-11-19 06:37:09.459 UTC [2705] FATAL:  terminating autovacuum process due to administrator command
2019-11-19 06:38:35.142 UTC [2791] LOG:  listening on IPv6 address "::1", port 5432
2019-11-19 06:38:35.142 UTC [2791] LOG:  listening on IPv4 address "127.0.0.1", port 5432
2019-11-19 06:38:35.143 UTC [2791] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2019-11-19 06:38:35.162 UTC [2792] LOG:  database system was interrupted; last known up at 2019-11-19 06:36:47 UTC
2019-11-19 06:38:35.162 UTC [2792] LOG:  creating missing WAL directory "pg_wal/archive_status"
2019-11-19 06:38:35.209 UTC [2792] LOG:  invalid primary checkpoint record
2019-11-19 06:38:35.210 UTC [2792] LOG:  invalid secondary checkpoint record
2019-11-19 06:38:35.210 UTC [2792] PANIC:  could not locate a valid checkpoint record
2019-11-19 06:38:37.204 UTC [2791] LOG:  startup process (PID 2792) was terminated by signal 6: Aborted
2019-11-19 06:38:37.206 UTC [2791] LOG:  aborting startup due to startup process failure
2019-11-19 06:38:37.222 UTC [2791] LOG:  database system is shut down
pg_ctl: could not start server
Examine the log output.




tar -jcvf pgdata.tar.bz2 $PGDATA



# Postgres < 10.0
pg_resetxlog -f $PGDATA

# Postgres >= 10.0
pg_resetwal -f $PGDATA