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標題：PostgreSQL恢復系列:pg_filedump批量處理
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pg_filedump工具使用起來比較麻煩,主要存在問題：
1. 需要人工一個個枚舉各個列類型無法實現批量恢復,參考以前寫的PostgreSQL恢復系列:pg_filedump基本使用
2. 特別是在pg庫無法正常運行的情況下,如果沒有業務提供表創建語句,恢復基本上無法正常進行.
基於這兩個問題,在以前的文章中寫過PostgreSQL恢復系列:pg_filedump恢復字典構造,爲了解決上述的兩個,弄了一個pg_filedump_batch腳本實現批量恢復需求
在測試的pg庫中創建了一些測試表,並查看部分表數據,便於對比後續恢復效果
postgres=# \d List of relations Schema | Name | Type | Owner --------+----------------+-------+---------- public | t_tbs | table | postgres public | t_xff | table | postgres public | t_xff2 | table | postgres public | t_xff3 | table | postgres public | t_xff4 | table | postgres public | t_xifenfei | table | postgres public | tab_attribute | table | postgres public | tab_class | table | postgres public | tab_database | table | postgres public | tab_namespace | table | postgres public | tab_tablespace | table | postgres public | tab_type | table | postgres(12 rows)postgres=# select * from tab_database; oid | datname | datdba | encoding | datcollate | datctype | datistemplate | datallowconn | datconnlimit | datlastsysoid | datfrozenxid | datminmxid | dattablespace -------+-------------+--------+----------+-------------+-------------+---------------+--------------+--------------+---------------+--------------+------------+--------------- 14187 | postgres | 10 | 6 | en_US.UTF-8 | en_US.UTF-8 | f | t | -1 | 14186 | 479 | 1 | 1663 16403 | db_xff | 10 | 6 | en_US.UTF-8 | en_US.UTF-8 | f | t | -1 | 14186 | 479 | 1 | 1663 1 | template1 | 10 | 6 | en_US.UTF-8 | en_US.UTF-8 | t | t | -1 | 14186 | 479 | 1 | 1663 14186 | template0 | 10 | 6 | en_US.UTF-8 | en_US.UTF-8 | t | f | -1 | 14186 | 479 | 1 | 1663 16407 | db_xifenfei | 16405 | 6 | en_US.UTF-8 | en_US.UTF-8 | f | t | -1 | 14186 | 479 | 1 | 16406(5 rows)postgres=# select count(1) from tab_class; count------- 407(1 row)postgres=# select *from pg_tablespace; oid | spcname | spcowner | spcacl | spcoptions -------+--------------+----------+--------+------------ 1663 | pg_default | 10 | | 1664 | pg_global | 10 | | 16406 | tbs_xifenfei | 16405 | | (3 rows) |
使用pg_filedump_bath腳本來實現批量恢復
[root@xifenfei tmp]# ./pg_filedump_batch recover --database-oid=14187 \ --output-directory=/data/recovery --pgdata=/var/lib/pgsql/12/dataRecover tables in database with oid: 14187LOG: starting to process table tab_attributeLOG: starting to process table tab_classLOG: starting to process table tab_databaseLOG: starting to process table tab_namespaceLOG: starting to process table tab_tablespaceLOG: starting to process table tab_typeLOG: starting to process table t_tbsLOG: starting to process table t_xffLOG: starting to process table t_xff2LOG: starting to process table t_xff3LOG: starting to process table t_xff4LOG: starting to process table t_xifenfeiCheck dumps in /data/recovery |
參考數據恢復
[root@xifenfei tmp]# cd /data/recovery/[root@xifenfei recovery]# ls -ltrtotal 156-rw-r--r-- 1 root root 82797 Apr 18 20:35 recovered-14187-tab_attribute.csv-rw-r--r-- 1 root root 31129 Apr 18 20:35 recovered-14187-tab_class.csv-rw-r--r-- 1 root root 343 Apr 18 20:35 recovered-14187-tab_database.csv-rw-r--r-- 1 root root 118 Apr 18 20:35 recovered-14187-tab_namespace.csv-rw-r--r-- 1 root root 50 Apr 18 20:35 recovered-14187-tab_tablespace.csv-rw-r--r-- 1 root root 7907 Apr 18 20:35 recovered-14187-tab_type.csv-rw-r--r-- 1 root root 0 Apr 18 20:35 recovered-14187-t_tbs.csv-rw-r--r-- 1 root root 38 Apr 18 20:35 recovered-14187-t_xff.csv-rw-r--r-- 1 root root 38 Apr 18 20:35 recovered-14187-t_xff2.csv-rw-r--r-- 1 root root 38 Apr 18 20:35 recovered-14187-t_xff3.csv-rw-r--r-- 1 root root 38 Apr 18 20:35 recovered-14187-t_xff4.csv-rw-r--r-- 1 root root 38 Apr 18 20:35 recovered-14187-t_xifenfei.csv[root@xifenfei recovery]# cat recovered-14187-tab_database.csv14187 postgres 10 6 en_US.UTF-8 en_US.UTF-8 f t -1 14186 479 1 166316403 db_xff 10 6 en_US.UTF-8 en_US.UTF-8 f t -1 14186 479 1 16631 template1 10 6 en_US.UTF-8 en_US.UTF-8 t t -1 14186 479 1 166314186 template0 10 6 en_US.UTF-8 en_US.UTF-8 t f -1 14186 479 1 166316407 db_xifenfei 16405 6 en_US.UTF-8 en_US.UTF-8 f t -1 14186 479 1 16406[root@xifenfei recovery]# cat recovered-14187-tab_class.csv|wc -l407[root@xifenfei recovery]# cat recovered-14187-tab_tablespace.csv1663 pg_default1664 pg_global16406 tbs_xifenfei |
把pg_class恢復數據導入庫中進行對比,證明恢復的數據完全正確
postgres=# COPY tab_class_new FROM '/data/recovery/recovered-14187-tab_class.csv';COPY 407postgres=# select count(1) from tab_class; count------- 407(1 row) count------- 407(1 row)postgres=# select count(1) from tab_class_new; count------- 407(1 row)postgres=# select * from tab_class_new postgres-# EXCEPTpostgres-# select * from tab_class; oid | relname | relnamespace | reltype | reloftype | relowner | relam | relfilenode | reltablespace | relpages | reltuples | relallvisible | reltoastrelid | relhasindex | relisshared | relpersistence | relkind -----+---------+--------------+---------+-----------+----------+-------+-------------+---------------+----------+-----------+---------------+---------------+-------------+-------------+----------------+---------(0 rows)postgres=# select * from tab_classpostgres-# EXCEPTpostgres-# select * from tab_class_new; oid | relname | relnamespace | reltype | reloftype | relowner | relam | relfilenode | reltablespace | relpages | reltuples | relallvisible | reltoastrelid | relhasindex | relisshared | relpersistence | relkind -----+---------+--------------+---------+-----------+----------+-------+-------------+---------------+----------+-----------+---------------+---------------+-------------+-------------+----------------+---------(0 rows) |
通過上述操作證明:
1. 在沒有人工列出列類型的情況下實現批量pg_filedump恢復功能
2. 在pg庫沒有啓動的情況下直接解析字典實現恢復功能
3. 實現pg數據庫的批量恢復
如果有PostgreSQL的數據庫故障,自行無法解決,請聯繫我們提供專業數據庫恢復技術支持:
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