PostgreSQL恢复系列:pg_filedump批量处理
惜分飞发表于 2024-04-18 13:11:35
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标题：PostgreSQL恢复系列:pg_filedump批量处理
作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]
pg_filedump工具使用起来比较麻烦,主要存在问题：
1. 需要人工一个个枚举各个列类型无法实现批量恢复,参考以前写的PostgreSQL恢复系列:pg_filedump基本使用
2. 特别是在pg库无法正常运行的情况下,如果没有业务提供表创建语句,恢复基本上无法正常进行.
基于这两个问题,在以前的文章中写过PostgreSQL恢复系列:pg_filedump恢复字典构造,为了解决上述的两个,弄了一个pg_filedump_batch脚本实现批量恢复需求
在测试的pg库中创建了一些测试表,并查看部分表数据,便于对比后续恢复效果
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 | datlastsysoi
d | datfrozenxid | datminmxid | dattablespace
-------+-------------+--------+----------+-------------+-------------+---------------+--------------+--------------+-------------
--+--------------+------------+---------------
14187 | postgres | 10 | 6 | en_US.UTF-8 | en_US.UTF-8 | f | t | -1 | 1418
6 | 479 | 1 | 1663
16403 | db_xff | 10 | 6 | en_US.UTF-8 | en_US.UTF-8 | f | t | -1 | 1418
6 | 479 | 1 | 1663
1 | template1 | 10 | 6 | en_US.UTF-8 | en_US.UTF-8 | t | t | -1 | 1418
6 | 479 | 1 | 1663
14186 | template0 | 10 | 6 | en_US.UTF-8 | en_US.UTF-8 | t | f | -1 | 1418
6 | 479 | 1 | 1663
16407 | db_xifenfei | 16405 | 6 | en_US.UTF-8 | en_US.UTF-8 | f | t | -1 | 1418
6 | 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脚本来实现批量恢复
[root@xifenfei tmp]# ./pg_filedump_batch recover --database-oid=14187 \ --output-directory=/data/recovery --pgdata=/var/lib/pgsql/12/data Recover tables in database with oid: 14187 LOG: starting to process table tab_attribute LOG: starting to process table tab_class LOG: starting to process table tab_database LOG: starting to process table tab_namespace LOG: starting to process table tab_tablespace LOG: starting to process table tab_type LOG: starting to process table t_tbs LOG: starting to process table t_xff LOG: starting to process table t_xff2 LOG: starting to process table t_xff3 LOG: starting to process table t_xff4 LOG: starting to process table t_xifenfei Check dumps in /data/recovery
参考数据恢复
[root@xifenfei tmp]# cd /data/recovery/ [root@xifenfei recovery]# ls -ltr total 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.csv 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 [root@xifenfei recovery]# cat recovered-14187-tab_class.csv|wc -l 407 [root@xifenfei recovery]# cat recovered-14187-tab_tablespace.csv 1663 pg_default 1664 pg_global 16406 tbs_xifenfei
把pg_class恢复数据导入库中进行对比,证明恢复的数据完全正确
postgres=# COPY tab_class_new FROM '/data/recovery/recovered-14187-tab_class.csv'; COPY 407 postgres=# 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-# EXCEPT postgres-# select * from tab_class; oid | relname | relnamespace | reltype | reloftype | relowner | relam | relfilenode | reltablespace | relpages | reltuples | rel allvisible | reltoastrelid | relhasindex | relisshared | relpersistence | relkind -----+---------+--------------+---------+-----------+----------+-------+-------------+---------------+----------+-----------+---- -----------+---------------+-------------+-------------+----------------+--------- (0 rows) postgres=# select * from tab_class postgres-# EXCEPT postgres-# select * from tab_class_new; oid | relname | relnamespace | reltype | reloftype | relowner | relam | relfilenode | reltablespace | relpages | reltuples | rel allvisible | reltoastrelid | relhasindex | relisshared | relpersistence | relkind -----+---------+--------------+---------+-----------+----------+-------+-------------+---------------+----------+-----------+---- -----------+---------------+-------------+-------------+----------------+--------- (0 rows)
通过上述操作证明:
1. 在没有人工列出列类型的情况下实现批量pg_filedump恢复功能
2. 在pg库没有启动的情况下直接解析字典实现恢复功能
3. 实现pg数据库的批量恢复
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