这篇文章主要讲解了“PostgreSQL中关于xid freeze的脚本有哪些”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“PostgreSQL中关于xid freeze的脚本有哪些”吧！

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Monitor Database
数据库监控脚本

[local:/data/run/pg12]:5120 pg12@testdb=# show autovacuum_freeze_max_age;
 autovacuum_freeze_max_age 
---------------------------
 200000000
(1 row)
[local:/data/run/pg12]:5120 pg12@testdb=# WITH max_age AS ( 
pg12@testdb(#     SELECT 2000000000 as max_old_xid
pg12@testdb(#         , setting AS autovacuum_freeze_max_age 
pg12@testdb(#         FROM pg_catalog.pg_settings 
pg12@testdb(#         WHERE name = 'autovacuum_freeze_max_age' )
pg12@testdb-# , per_database_stats AS ( 
pg12@testdb(#     SELECT datname
pg12@testdb(#         , m.max_old_xid::int
pg12@testdb(#         , m.autovacuum_freeze_max_age::int
pg12@testdb(#         , age(d.datfrozenxid) AS oldest_current_xid 
pg12@testdb(#     FROM pg_catalog.pg_database d 
pg12@testdb(#     JOIN max_age m ON (true) 
pg12@testdb(#     WHERE d.datallowconn ) 
pg12@testdb-# SELECT max(oldest_current_xid) AS oldest_current_xid
pg12@testdb-#     , max(ROUND(100*(oldest_current_xid/max_old_xid::float))) AS percent_towards_wraparound
pg12@testdb-#     , max(ROUND(100*(oldest_current_xid/autovacuum_freeze_max_age::float))) AS percent_towards_emergency_autovac 
pg12@testdb-# FROM per_database_stats;
 oldest_current_xid | percent_towards_wraparound | percent_towards_emergency_autovac 
--------------------+----------------------------+-----------------------------------
               3844 |                          0 |                                 0
(1 row)
[local:/data/run/pg12]:5120 pg12@testdb=#

percent_towards_wraparound=数据库年龄/20亿，如接近100%，那么需要特别注意；
percent_towards_emergency_autovac=数据库年龄/autovacuum_freeze_max_age，autovacuum_freeze_max_age参数一般为2亿。

下面的脚本列出了每个数据库的年龄和autovacuum_freeze_max_age参数的设定。

[local:/data/run/pg12]:5120 pg12@testdb=# SELECT datname
pg12@testdb-#     , age(datfrozenxid)
pg12@testdb-#     , current_setting('autovacuum_freeze_max_age') 
pg12@testdb-# FROM pg_database 
pg12@testdb-# ORDER BY 2 DESC;
  datname  | age  | current_setting 
-----------+------+-----------------
 postgres  | 3844 | 200000000
 template1 | 3844 | 200000000
 template0 | 3844 | 200000000
 db1       | 3844 | 200000000
 db2       | 3844 | 200000000
 db3       | 3844 | 200000000
 testdb    | 3844 | 200000000
(7 rows)

Monitor relation
监控关系（数据表）

[local:/data/run/pg12]:5120 pg12@testdb=# SELECT c.oid::regclass
pg12@testdb-#     , age(c.relfrozenxid)
pg12@testdb-#     , pg_size_pretty(pg_total_relation_size(c.oid)) 
pg12@testdb-# FROM pg_class c
pg12@testdb-# JOIN pg_namespace n on c.relnamespace = n.oid
pg12@testdb-# WHERE relkind IN ('r', 't', 'm') 
pg12@testdb-# AND n.nspname NOT IN ('pg_toast')
pg12@testdb-# ORDER BY 2 DESC LIMIT 100;
                    oid                     | age  | pg_size_pretty 
--------------------------------------------+------+----------------
 pg_policy                                  | 3844 | 24 kB
 pg_init_privs                              | 3844 | 72 kB
 pg_seclabel                                | 3844 | 16 kB
 pg_shseclabel                              | 3844 | 16 kB
 pg_collation                               | 3844 | 384 kB
 pg_partitioned_table                       | 3844 | 16 kB
 pg_range                                   | 3844 | 56 kB
 pg_transform                               | 3844 | 16 kB
 pg_sequence                                | 3844 | 8192 bytes
 pg_publication                             | 3844 | 16 kB
 pg_publication_rel                         | 3844 | 16 kB
 pg_subscription_rel                        | 3844 | 8192 bytes
 information_schema.sql_packages            | 3844 | 48 kB
 information_schema.sql_features            | 3844 | 104 kB
 information_schema.sql_implementation_info | 3844 | 48 kB
 information_schema.sql_parts               | 3844 | 48 kB
 information_schema.sql_languages           | 3844 | 48 kB
 information_schema.sql_sizing              | 3844 | 48 kB
 pg_statistic                               | 3844 | 312 kB
 pg_type                                    | 3844 | 192 kB
 pg_foreign_server                          | 3844 | 24 kB
 pg_authid                                  | 3844 | 48 kB
 pg_statistic_ext_data                      | 3844 | 16 kB
--More--

以上列出了每个relation的age以及relation的大小。

Auto Generate Script
该脚本自动创建清理脚本。

[local:/data/run/pg12]:5120 pg12@testdb=# \t
Tuples only is on.
[local:/data/run/pg12]:5120 pg12@testdb=# \o /tmp/vacuum.sql
[local:/data/run/pg12]:5120 pg12@testdb=# select 'vacuum freeze analyze verbose ' || oid::regclass || ';' from pg_class where relkind in ('r', 't', 'm') order by age(relfrozenxid) desc limit 100;
[local:/data/run/pg12]:5120 pg12@testdb=# \o
[local:/data/run/pg12]:5120 pg12@testdb=# \t
Tuples only is off.
[local:/data/run/pg12]:5120 pg12@testdb=# \set ECHO all
[local:/data/run/pg12]:5120 pg12@testdb=# \! cat /tmp/vacuum.sql
 vacuum freeze analyze verbose pg_ts_parser;
 vacuum freeze analyze verbose pg_collation;
 vacuum freeze analyze verbose pg_partitioned_table;
 vacuum freeze analyze verbose pg_range;
 vacuum freeze analyze verbose pg_transform;
 vacuum freeze analyze verbose pg_sequence;
 vacuum freeze analyze verbose pg_publication;
 vacuum freeze analyze verbose pg_publication_rel;
 vacuum freeze analyze verbose pg_subscription_rel;
 vacuum freeze analyze verbose information_schema.sql_packages;
 vacuum freeze analyze verbose pg_toast.pg_toast_13426;
 vacuum freeze analyze verbose information_schema.sql_features;
 vacuum freeze analyze verbose pg_toast.pg_toast_13431;
 vacuum freeze analyze verbose pg_toast.pg_toast_13446;
 vacuum freeze analyze verbose information_schema.sql_implementation_info;
 vacuum freeze analyze verbose pg_toast.pg_toast_13436;
 vacuum freeze analyze verbose information_schema.sql_parts;
 vacuum freeze analyze verbose information_schema.sql_languages;
 vacuum freeze analyze verbose pg_toast.pg_toast_13441;
 vacuum freeze analyze verbose information_schema.sql_sizing;
 vacuum freeze analyze verbose pg_toast.pg_toast_13451;
 vacuum freeze analyze verbose pg_statistic;
 vacuum freeze analyze verbose pg_type;
 vacuum freeze analyze verbose pg_toast.pg_toast_2600;
 vacuum freeze analyze verbose pg_toast.pg_toast_2604;
 vacuum freeze analyze verbose pg_toast.pg_toast_3456;
 vacuum freeze analyze verbose pg_toast.pg_toast_2606;
 vacuum freeze analyze verbose pg_toast.pg_toast_826;
 vacuum freeze analyze verbose pg_toast.pg_toast_2609;
 vacuum freeze analyze verbose pg_toast.pg_toast_3466;
 vacuum freeze analyze verbose pg_toast.pg_toast_3079;
 vacuum freeze analyze verbose pg_toast.pg_toast_2328;
 vacuum freeze analyze verbose pg_toast.pg_toast_1417;
 vacuum freeze analyze verbose pg_toast.pg_toast_3118;
 vacuum freeze analyze verbose pg_toast.pg_toast_3394;
 vacuum freeze analyze verbose pg_toast.pg_toast_2612;
 vacuum freeze analyze verbose pg_toast.pg_toast_2615;
 vacuum freeze analyze verbose pg_foreign_server;
 vacuum freeze analyze verbose pg_toast.pg_toast_3350;
 vacuum freeze analyze verbose pg_toast.pg_toast_3256;
 vacuum freeze analyze verbose pg_toast.pg_toast_1255;
 vacuum freeze analyze verbose pg_toast.pg_toast_2618;
 vacuum freeze analyze verbose pg_toast.pg_toast_3596;
 vacuum freeze analyze verbose pg_toast.pg_toast_2619;
 vacuum freeze analyze verbose pg_toast.pg_toast_3381;
 vacuum freeze analyze verbose pg_toast.pg_toast_3429;
 vacuum freeze analyze verbose pg_toast.pg_toast_2620;
 vacuum freeze analyze verbose pg_toast.pg_toast_3600;
 vacuum freeze analyze verbose pg_toast.pg_toast_1247;
 vacuum freeze analyze verbose pg_toast.pg_toast_1418;
 vacuum freeze analyze verbose pg_toast.pg_toast_1260;
 vacuum freeze analyze verbose pg_toast.pg_toast_1262;
 vacuum freeze analyze verbose pg_toast.pg_toast_2964;
 vacuum freeze analyze verbose pg_toast.pg_toast_1136;
 vacuum freeze analyze verbose pg_toast.pg_toast_6000;
 vacuum freeze analyze verbose pg_toast.pg_toast_2396;
 vacuum freeze analyze verbose pg_toast.pg_toast_3592;
 vacuum freeze analyze verbose pg_toast.pg_toast_6100;
 vacuum freeze analyze verbose pg_toast.pg_toast_1213;
 vacuum freeze analyze verbose pg_authid;
 vacuum freeze analyze verbose pg_statistic_ext_data;
 vacuum freeze analyze verbose pg_user_mapping;
 vacuum freeze analyze verbose pg_subscription;
 vacuum freeze analyze verbose pg_attribute;
 vacuum freeze analyze verbose pg_proc;
 vacuum freeze analyze verbose pg_class;
 vacuum freeze analyze verbose pg_attrdef;
 vacuum freeze analyze verbose pg_constraint;
 vacuum freeze analyze verbose pg_inherits;
 vacuum freeze analyze verbose pg_index;
 vacuum freeze analyze verbose pg_operator;
 vacuum freeze analyze verbose pg_opfamily;
 vacuum freeze analyze verbose pg_opclass;
 vacuum freeze analyze verbose pg_am;
 vacuum freeze analyze verbose pg_amop;
 vacuum freeze analyze verbose pg_amproc;
 vacuum freeze analyze verbose pg_language;
 vacuum freeze analyze verbose pg_largeobject_metadata;
 vacuum freeze analyze verbose pg_aggregate;
 vacuum freeze analyze verbose pg_largeobject;
 vacuum freeze analyze verbose pg_statistic_ext;
 vacuum freeze analyze verbose pg_rewrite;
 vacuum freeze analyze verbose pg_trigger;
 vacuum freeze analyze verbose pg_event_trigger;
 vacuum freeze analyze verbose pg_description;
 vacuum freeze analyze verbose pg_cast;
 vacuum freeze analyze verbose pg_enum;
 vacuum freeze analyze verbose pg_namespace;
 vacuum freeze analyze verbose pg_conversion;
 vacuum freeze analyze verbose pg_depend;
 vacuum freeze analyze verbose pg_database;
 vacuum freeze analyze verbose pg_db_role_setting;
 vacuum freeze analyze verbose pg_tablespace;
 vacuum freeze analyze verbose pg_pltemplate;
 vacuum freeze analyze verbose pg_auth_members;
 vacuum freeze analyze verbose pg_shdepend;
 vacuum freeze analyze verbose pg_shdescription;
 vacuum freeze analyze verbose pg_ts_config;
 vacuum freeze analyze verbose pg_ts_config_map;
 vacuum freeze analyze verbose pg_ts_dict;
[local:/data/run/pg12]:5120 pg12@testdb=#

感谢各位的阅读，以上就是“PostgreSQL中关于xid freeze的脚本有哪些”的内容了，经过本文的学习后，相信大家对PostgreSQL中关于xid freeze的脚本有哪些这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！

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