wal日誌是瀚高資料庫至關重要的日誌檔案，資料恢復的重要依靠保障，如果誤刪了資料庫會怎樣呢？
模擬情況：
[highgo@sds1 data]$ pg_ctl start
server starting
[highgo@sds1 data]$ log: 00000: database system was shut down at 2018-11-14 23:31:31 cst
log: 00000: creating missing wal directory "pg_xlog/archive_status"
log: 00000: invalid primary checkpoint record
log: 00000: invalid secondary checkpoint record
panic: xx000: could not locate a valid checkpoint record
[highgo@sds1 data]$ psql
fatal: 57p03: the database system is starting up
psql: fatal: 57p03: the database system is starting up
[highgo@sds1 data]$ log: 00000: startup process (pid 5967) was terminated by signal 6: aborted
log: 00000: aborting startup due to startup process failure
[highgo@sds1 data]$
[highgo@sds1 data]$ psql
psql: could not connect to server: no such file or directory
is the server running locally and accepting
connections on unix domain socket "/tmp/.s.pgsql.5866"?
[highgo@sds1 data]$ pg_resetxlog -d $pgdata
transaction log reset
[highgo@sds1 data]$ pg_ctl start
server starting
[highgo@sds1 data]$ log: 00000: database system was shut down at 2018-11-14 23:39:15 cst
log: 00000: multixact member wraparound protections are now enabled
log: 00000: database system is ready to accept connections
log: 00000: autovacuum launcher started
[highgo@sds1 data]$ psql
psql (4.7.6)
psql: release 4.7.6
connected to:
highgo database v4.7 enterprise edition release 4.7.6 - 64-bit production
type "help" for help.
highgo=#
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