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最近发表
- Oracle 19c/21c最新patch信息-202404
- PostgreSQL恢复系列:pg_filedump批量处理
- PostgreSQL部分主要字典信息
- PostgreSQL恢复系列:pg_filedump恢复字典构造
- PostgreSQL 16 源码安装
- ORA-00742 ORA-00312 恢复
- 数据库open成功后报ORA-00353 ORA-00354错误引起的一系列问题(本质ntfs文件系统异常)
- ORA-600 ktsiseginfo1故障
- ORA-00600: internal error code, arguments: [16703], [1403], [4] 原因
- 最近遇到几起ORA-600 16703故障(tab$被清空),请引起重视
- ORA-600 2662快速恢复之Patch scn工具
- TNS-12518: TNS:listener could not hand off client connection
- ora.storage无法启动报ORA-12514故障处理
- 断电引起文件scn异常数据库恢复
- ORA-16188: LOG_ARCHIVE_CONFIG settings inconsistent with previously started instance
- .[hudsonL@cock.li].mkp勒索加密数据库完美恢复
- 模拟带库实现rman远程备份
- 又一例:ORA-600 kclchkblk_4和2662故障
- Oracle误删除数据文件恢复
- Oracle 19C 备库DML重定向—DML Redirection
分类目录归档:PostgreSQL
PostgreSQL 16 源码安装
空闲中尝试在linux 8的版本上,源码安装PostgreSQL 16,参考文章:PostgreSQL16.2源码部署教程
[root@xifenfei tmp]# cat /etc/redhat-release Red Hat Enterprise Linux release 8.7 (Ootpa) [root@xifenfei tmp]# uname -osr Linux 5.15.0-3.60.5.1.el8uek.x86_64 GNU/Linux
下载pg源码程序:PostgreSQL 16源码下载
linux配置
--关闭selinux sed -i "s/SELINUX=enforcing/SELINUX=disabled/" /etc/selinux/config setenforce 0 --安装相应的包 yum -y install readline readline-devel zlib zlib-devel gettext \ gettext-devel openssl openssl-devel pam pam-devel libxml2 \ libxml2-devel libxslt libxslt-devel perl perl-devel tcl-devel \ libuuid-devel gcc gcc-c++ make flex bison perl-ExtUtils* libicu libicu-devel --修改内核参数 cat>>/etc/sysctl.conf<<EOF fs.file-max = 76724200 kernel.sem = 10000 10240000 10000 1024 kernel.shmmni = 4096 kernel.shmall = 253702 kernel.shmmax = 1039163392 net.ipv4.ip_local_port_range = 9000 65500 net.core.rmem_default = 262144 net.core.wmem_default = 262144 net.core.rmem_max = 4194304 net.core.wmem_max = 1048576 fs.aio-max-nr = 40960000 vm.dirty_ratio=20 vm.dirty_background_ratio=3 vm.dirty_writeback_centisecs=100 vm.dirty_expire_centisecs=500 vm.swappiness=10 vm.min_free_kbytes=524288 vm.swappiness=0 vm.overcommit_memory=2 vm.overcommit_ratio=75 net.ipv4.ip_local_port_range = 10000 65535 EOF sysctl -p --创建组和用户 groupadd postgres -g 3000 useradd postgres -g 3000 -u 3000 --用户 limits 配置 cat>>/etc/security/limits.conf<<EOF postgres soft nofile 1048576 postgres hard nofile 1048576 postgres soft nproc 131072 postgres hard nproc 131072 postgres soft stack 10240 postgres hard stack 32768 postgres soft core 6291456 postgres hard core 6291456 EOF --创建相关目录和权限 mkdir -p /pg/database/server mkdir -p /pg/database/data mkdir -p /pg/database/wal mkdir -p /pg/database/archive chown -R postgres:postgres /pg -R chmod 0775 /pg chmod 0700 /pg/database/data --设置环境变量 vi /home/postgres/.bash_profile export PGPORT=5432 export PGUSER=postgres export PGHOME=/pg/database/server export PGDATA=/pg/database/data export PATH=$PGHOME/bin:$PATH --编译pg软件 su - postgres tar xzvf postgresql-16.2.tar.gz cd /tmp/postgresql-16.2 ./configure --prefix=/pg/database/server --with-pgport=5432 make make install --确认软件安装成功(检查编译日志和测试如下命令) [postgres@xifenfei ~]$ postgres --version postgres (PostgreSQL) 16.2
创建数据库
[postgres@xifenfei ~]$ /pg/database/server/bin/initdb -D/pg/database/data\ -X/pg/database/wal -EUTF8 -Upostgres -W The files belonging to this database system will be owned by user "postgres". This user must also own the server process. The database cluster will be initialized with locale "en_US.UTF-8". The default text search configuration will be set to "english". Data page checksums are disabled. Enter new superuser password: Enter it again: fixing permissions on existing directory /pg/database/data ... ok fixing permissions on existing directory /pg/database/wal ... ok creating subdirectories ... ok selecting dynamic shared memory implementation ... posix selecting default max_connections ... 100 selecting default shared_buffers ... 128MB selecting default time zone ... America/New_York creating configuration files ... ok running bootstrap script ... ok performing post-bootstrap initialization ... ok syncing data to disk ... ok initdb: warning: enabling "trust" authentication for local connections initdb: hint: You can change this by editing pg_hba.conf or using the option -A, or --auth-local and --auth-host, the next time you run initdb. Success. You can now start the database server using: /pg/database/server/bin/pg_ctl -D /pg/database/data -l logfile start
启动数据库
[postgres@xifenfei ~]$ /pg/database/server/bin/pg_ctl -D /pg/database/data -l logfile start waiting for server to start.... done server started [postgres@xifenfei ~]$ psql psql (16.2) Type "help" for help. postgres=# \d pg_class Table "pg_catalog.pg_class" Column | Type | Collation | Nullable | Default ---------------------+--------------+-----------+----------+--------- oid | oid | | not null | relname | name | | not null | relnamespace | oid | | not null | reltype | oid | | not null | reloftype | oid | | not null | relowner | oid | | not null | relam | oid | | not null | relfilenode | oid | | not null | reltablespace | oid | | not null | relpages | integer | | not null | reltuples | real | | not null | relallvisible | integer | | not null | reltoastrelid | oid | | not null | relhasindex | boolean | | not null | relisshared | boolean | | not null | relpersistence | "char" | | not null | relkind | "char" | | not null | relnatts | smallint | | not null | relchecks | smallint | | not null | relhasrules | boolean | | not null | relhastriggers | boolean | | not null | relhassubclass | boolean | | not null | relrowsecurity | boolean | | not null | relforcerowsecurity | boolean | | not null | relispopulated | boolean | | not null | relreplident | "char" | | not null | relispartition | boolean | | not null | relrewrite | oid | | not null | relfrozenxid | xid | | not null | relminmxid | xid | | not null | relacl | aclitem[] | | | reloptions | text[] | C | | relpartbound | pg_node_tree | C | | Indexes: "pg_class_oid_index" PRIMARY KEY, btree (oid) "pg_class_relname_nsp_index" UNIQUE CONSTRAINT, btree (relname, relnamespace) "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
配置开机自动启动
[root@xifenfei tmp]# cp /tmp/postgresql-16.2/contrib/start-scripts/linux /etc/init.d/PostgreSQL [root@xifenfei tmp]# vi /etc/init.d/PostgreSQL --修改如下值 prefix=/pg/database/server PGDATA="/pg/database/data" [root@xifenfei tmp]# chkconfig --add PostgreSQL [root@xifenfei tmp]# chkconfig --list Note: This output shows SysV services only and does not include native systemd services. SysV configuration data might be overridden by native systemd configuration. If you want to list systemd services use 'systemctl list-unit-files'. To see services enabled on particular target use 'systemctl list-dependencies [target]'. PostgreSQL 0:off 1:off 2:on 3:on 4:on 5:on 6:off
PostgreSQL恢复系列:pg_filedump基本使用
当PostgreSQL遇到重大故障,使用各种方法都无法直接启动数据库,可以考虑使用类似oracle dul工具,直接离线方式读取文件进行恢复.这个工具为pg_filedump
pg_filedump安装
[root@xifenfei ~]# yum install pg_filedump_14.x86_64 Loaded plugins: langpacks, ulninfo Resolving Dependencies --> Running transaction check ---> Package pg_filedump_14.x86_64 0:14.1-1.rhel7 will be installed --> Finished Dependency Resolution Dependencies Resolved ====================================================================================================================== Package Arch Version Repository Size ====================================================================================================================== Installing: pg_filedump_14 x86_64 14.1-1.rhel7 pgdg14 43 k Transaction Summary ====================================================================================================================== Install 1 Package Total download size: 43 k Installed size: 81 k Is this ok [y/d/N]: y Downloading packages: pg_filedump_14-14.1-1.rhel7.x86_64.rpm | 43 kB 00:00:02 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : pg_filedump_14-14.1-1.rhel7.x86_64 1/1 Verifying : pg_filedump_14-14.1-1.rhel7.x86_64 1/1 Installed: pg_filedump_14.x86_64 0:14.1-1.rhel7 Complete! -bash-4.2$ pg_filedump Version 14.1 (for PostgreSQL 8.x .. 14.x) Copyright (c) 2002-2010 Red Hat, Inc. Copyright (c) 2011-2022, PostgreSQL Global Development Group Usage: pg_filedump [-abcdfhikxy] [-R startblock [endblock]] [-D attrlist] [-S blocksize] [-s segsize] [-n segnumber] file Display formatted contents of a PostgreSQL heap/index/control file Defaults are: relative addressing, range of the entire file, block size as listed on block 0 in the file The following options are valid for heap and index files: -a Display absolute addresses when formatting (Block header information is always block relative) -b Display binary block images within a range (Option will turn off all formatting options) -d Display formatted block content dump (Option will turn off all other formatting options) -D Decode tuples using given comma separated list of types Supported types: bigint bigserial bool char charN date float float4 float8 int json macaddr name numeric oid real serial smallint smallserial text time timestamp timestamptz timetz uuid varchar varcharN xid xml ~ ignores all attributes left in a tuple -f Display formatted block content dump along with interpretation -h Display this information -i Display interpreted item details -k Verify block checksums -o Do not dump old values. -R Display specific block ranges within the file (Blocks are indexed from 0) [startblock]: block to start at [endblock]: block to end at A startblock without an endblock will format the single block -s Force segment size to [segsize] -t Dump TOAST files -v Ouput additional information about TOAST relations -n Force segment number to [segnumber] -S Force block size to [blocksize] -x Force interpreted formatting of block items as index items -y Force interpreted formatting of block items as heap items The following options are valid for control files: -c Interpret the file listed as a control file -f Display formatted content dump along with interpretation -S Force block size to [blocksize] Additional functions: -m Interpret file as pg_filenode.map file and print contents (all other options will be ignored) Report bugs to <pgsql-bugs@postgresql.org>
创建测试表
-bash-4.2$ psql psql (14.3) Type "help" for help. postgres=# create table pg_xifenfei(id int,name varchar(100)); CREATE TABLE postgres=# insert into pg_xifenfei values(1,'www.xifenfei.com'); INSERT 0 1 postgres=# insert into pg_xifenfei values(2,'xienfei_pg_recovery'); INSERT 0 1 postgres=# select * from pg_xifenfei; id | name ----+--------------------- 1 | www.xifenfei.com 2 | xienfei_pg_recovery (2 rows) postgres=#
pg_filedump恢复数据
-bash-4.2$ pg_filedump /var/lib/pgsql/14/data/base/14487/16384 ******************************************************************* * PostgreSQL File/Block Formatted Dump Utility * * File: /var/lib/pgsql/14/data/base/14487/16384 * Options used: None ******************************************************************* Block 0 ******************************************************** <Header> ----- Block Offset: 0x00000000 Offsets: Lower 32 (0x0020) Block: Size 8192 Version 4 Upper 8096 (0x1fa0) LSN: logid 0 recoff 0x16299cf0 Special 8192 (0x2000) Items: 2 Free Space: 8064 Checksum: 0x0000 Prune XID: 0x00000000 Flags: 0x0000 () Length (including item array): 32 <Data> ----- Item 1 -- Length: 45 Offset: 8144 (0x1fd0) Flags: NORMAL Item 2 -- Length: 48 Offset: 8096 (0x1fa0) Flags: NORMAL *** End of File Encountered. Last Block Read: 0 *** -bash-4.2$ pg_filedump -D int,charn /var/lib/pgsql/14/data/base/14487/16384|grep COPY COPY: 1 www.xifenfei.com COPY: 2 xienfei_pg_recovery -bash-4.2$ pg_filedump -D int,charn /var/lib/pgsql/14/data/base/14487/16384|grep COPY > |awk '{$1=null;print $0}'>/tmp/pg_xifenfei_rec -bash-4.2$ sed -i 's/^[ ]*//g' /tmp/pg_xifenfei_rec
导入数据验证
postgres=# truncate table pg_xifenfei; TRUNCATE TABLE postgres=# select * from pg_xifenfei; id | name ----+------ (0 rows) postgres=# copy pg_xifenfei from '/tmp/pg_xifenfei_rec'(DELIMITER ' '); COPY 2 postgres=# select * from pg_xifenfei; id | name ----+--------------------- 1 | www.xifenfei.com 2 | xienfei_pg_recovery (2 rows)
通过上述简单测试证明,在PG数据库出现极端情况下,可以使用该方法进行最后的数据恢复,减少因为数据丢失带来的损失.
PostgreSQL恢复系列:pg_control异常恢复
在PG中pg_control文件类似oracle数据库的control文件(控制文件),在Oracle中如果该文件丢失/损坏,可以通过alter database create controlfile命令进行创建,对于PG数据库来说也可以通过pg_resetwal命令来实现创建,由于pg_control文件损坏,需要人工指定一些参数完成pg_resetwal相关操作
pg_resetwal 使用说明
-bash-4.2$ pg_resetwal --help pg_resetwal resets the PostgreSQL write-ahead log. Usage: pg_resetwal [OPTION]... DATADIR Options: -c, --commit-timestamp-ids=XID,XID set oldest and newest transactions bearing commit timestamp (zero means no change) [-D, --pgdata=]DATADIR data directory -e, --epoch=XIDEPOCH set next transaction ID epoch -f, --force force update to be done -l, --next-wal-file=WALFILE set minimum starting location for new WAL -m, --multixact-ids=MXID,MXID set next and oldest multitransaction ID -n, --dry-run no update, just show what would be done -o, --next-oid=OID set next OID -O, --multixact-offset=OFFSET set next multitransaction offset -u, --oldest-transaction-id=XID set oldest transaction ID -V, --version output version information, then exit -x, --next-transaction-id=XID set next transaction ID --wal-segsize=SIZE size of WAL segments, in megabytes -?, --help show this help, then exit Report bugs to <pgsql-bugs@lists.postgresql.org>. PostgreSQL home page: <https://www.postgresql.org/>
确认现在业务表记录情况
-bash-4.2$ psql psql (14.3) Type "help" for help. postgres=# select count(1) from ac_event; count -------- 246266 (1 row)
模拟pg_control文件异常
-bash-4.2$ ps -ef|grep postgres postgres 37178 1 0 09:58 ? 00:00:00 /usr/pgsql-14/bin/postgres -D /var/lib/pgsql/14/data postgres 37179 37178 0 09:58 ? 00:00:00 postgres: logger postgres 37181 37178 0 09:58 ? 00:00:00 postgres: checkpointer postgres 37182 37178 0 09:58 ? 00:00:00 postgres: background writer postgres 37183 37178 0 09:58 ? 00:00:00 postgres: walwriter postgres 37184 37178 0 09:58 ? 00:00:00 postgres: autovacuum launcher postgres 37185 37178 0 09:58 ? 00:00:00 postgres: stats collector postgres 37186 37178 0 09:58 ? 00:00:00 postgres: logical replication launcher root 41368 41314 0 11:06 pts/1 00:00:00 su - postgres postgres 41369 41368 0 11:06 pts/1 00:00:00 -bash postgres 45071 41369 0 12:07 pts/1 00:00:00 ps -ef postgres 45072 41369 0 12:07 pts/1 00:00:00 grep --color=auto postgres -bash-4.2$ kill -9 37178 -bash-4.2$ ps -ef|grep postgres root 41368 41314 0 11:06 pts/1 00:00:00 su - postgres postgres 41369 41368 0 11:06 pts/1 00:00:00 -bash postgres 45095 41369 0 12:08 pts/1 00:00:00 ps -ef postgres 45096 41369 0 12:08 pts/1 00:00:00 grep --color=auto postgres -bash-4.2$ pwd /var/lib/pgsql/14/data/global -bash-4.2$ ls -l pg_control -rw-------. 1 postgres postgres 8192 May 30 12:04 pg_control -bash-4.2$ rm -rf pg_control -bash-4.2$ ls -l pg_control ls: cannot access pg_control: No such file or directory
PG启动失败
-bash-4.2$ pg_ctl start pg_ctl: another server might be running; trying to start server anyway waiting for server to start....postgres: could not find the database system Expected to find it in the directory "/var/lib/pgsql/14/data", but could not open file "/var/lib/pgsql/14/data/global/pg_control": No such file or directory stopped waiting pg_ctl: could not start server Examine the log output.
创建空pg_control文件启动依旧失败
-bash-4.2$ touch /var/lib/pgsql/14/data/global/pg_control -bash-4.2$ pg_ctl start pg_ctl: another server might be running; trying to start server anyway waiting for server to start....2022-05-30 12:09:43.953 CST [45215] PANIC: could not read file "global/pg_control": read 0 of 296 stopped waiting pg_ctl: could not start server Examine the log output.
设置next-wal-file
-l, –next-wal-file=WALFILE,这个参数设置下一个新的WAL文件的最小值,这个值可以从$PGDATA/pg_wal目录下去看最后一个WAL 文件,这个文件的id+1即可
-bash-4.2$ pwd /var/lib/pgsql/14/data/pg_wal -bash-4.2$ ls -l total 16384 -rw-------. 1 postgres postgres 16777216 May 30 12:04 000000010000000000000014 drwx------. 2 postgres postgres 6 May 24 02:20 archive_status -bash-4.2$
这个文件+1,-l 000000010000000000000015
设置next-transaction
-x, –next-transaction-id=XID,这个参数设置pg_control中的下一个XID的值,这个值可以从pg_xact目录下的文件中查询
-bash-4.2$ pwd /var/lib/pgsql/14/data/pg_xact -bash-4.2$ ls -ltr total 8 -rw-------. 1 postgres postgres 8192 May 30 12:03 0000
最后一个是0000,那么下一个XID就是0001,然后乘以 1048576 (0×100000),实际上后面直接加5个0就行了。注意,这个值是16进制的。-x 0×000100000
multixact-ids设置
-m, –multixact-ids=MXID1,MXID2,这个参数包含两个部分,MXID1和MXID2,都可以从$PGDATA/pg_multixact/offsets目录下获得。MXID1的值,首先找到最大值,+1,再乘以 65536 (0×10000,相当于后面加4个0)作为这个参数的前半部分。找到最小的值,后面加4个0,作为MXID2的值
-bash-4.2$ pwd /var/lib/pgsql/14/data/pg_multixact/offsets -bash-4.2$ ls -ltr total 8 -rw-------. 1 postgres postgres 8192 May 29 22:06 0000 -bash-4.2$
-m 0×00010000, 0×00000000(由于oldest multitransaction ID不能为0,因此后续这个值需要适当调整)
multixact-offset设置
-O, –multixact-offset=OFFSET,这个参数可以从$PGDATA/pg_multixact/members目录下获得。找到最大值,+1,乘以 52352 (0xCC80)
-bash-4.2$ pwd /var/lib/pgsql/14/data/pg_multixact/members -bash-4.2$ ls -ltr total 8 -rw-------. 1 postgres postgres 8192 May 24 02:20 0000
-O 0xCC80
尝试执行pg_resetwal
-bash-4.2$ pg_resetwal -l 000000010000000000000015 -x 0x000100000 -m 0x00010000,0x00000000 -O 0xCC80 $PGDATA pg_resetwal: error: oldest multitransaction ID (-m) must not be 0
multixact-ids值不对,进行调整后处理
postmaster.pid文件需要清理
由于PG库异常关闭,需要人工清理掉该文件
-bash-4.2$ pg_resetwal -l 000000010000000000000015 -x 0x000100000 -m 0x00020000,0x00010000 -O 0xCC80 $PGDATA pg_resetwal: error: lock file "postmaster.pid" exists -bash-4.2$ rm -rf postmaster.pid
pg_resetwal结果预览
-bash-4.2$ pg_resetwal -l 000000010000000000000015 -x 0x000100000 -m 0x00020000,0x00010000 -O 0xCC80 $PGDATA pg_resetwal: warning: pg_control exists but is broken or wrong version; ignoring it Guessed pg_control values: pg_control version number: 1300 Catalog version number: 202107181 Database system identifier: 7103392535324046312 Latest checkpoint's TimeLineID: 1 Latest checkpoint's full_page_writes: off Latest checkpoint's NextXID: 0:3 Latest checkpoint's NextOID: 12000 Latest checkpoint's NextMultiXactId: 1 Latest checkpoint's NextMultiOffset: 0 Latest checkpoint's oldestXID: 3 Latest checkpoint's oldestXID's DB: 0 Latest checkpoint's oldestActiveXID: 0 Latest checkpoint's oldestMultiXid: 1 Latest checkpoint's oldestMulti's DB: 0 Latest checkpoint's oldestCommitTsXid:0 Latest checkpoint's newestCommitTsXid:0 Maximum data alignment: 8 Database block size: 8192 Blocks per segment of large relation: 131072 WAL block size: 8192 Bytes per WAL segment: 16777216 Maximum length of identifiers: 64 Maximum columns in an index: 32 Maximum size of a TOAST chunk: 1996 Size of a large-object chunk: 2048 Date/time type storage: 64-bit integers Float8 argument passing: by value Data page checksum version: 0 Values to be changed: First log segment after reset: 000000010000000000000015 NextMultiXactId: 131072 OldestMultiXid: 65536 OldestMulti's DB: 0 NextMultiOffset: 52352 NextXID: 1048576 OldestXID: 3 OldestXID's DB: 0 If these values seem acceptable, use -f to force reset.
pg_resetwal进行创建pg_control并启动PG
-bash-4.2$ pg_resetwal -l 000000010000000000000015 -x 0x000100000 -m 0x00020000,0x00010000 -O 0xCC80 -f $PGDATA pg_resetwal: warning: pg_control exists but is broken or wrong version; ignoring it Write-ahead log reset -bash-4.2$ pg_ctl start waiting for server to start....2022-05-30 13:33:28.266 CST [51437] LOG: redirecting log output to logging collector process 2022-05-30 13:33:28.266 CST [51437] HINT: Future log output will appear in directory "log". done server started
验证数据
-bash-4.2$ psql psql (14.3) Type "help" for help. postgres=# select count(1) from ac_event; count -------- 245275 (1 row)
这种方法恢复之后,建议理解dump数据,然后导入到新库中