PolarDB PG (RAC)
使用阿里云开源的 PolarDB for PostgreSQL 内核提供国产信创资质支持，与类似 Oracle RAC 的使用体验。
Module:
概览
Pigsty 允许使用 PolarDB 创建带有 “国产化信创资质” 的 PostgreSQL 集群！
PolarDB for PostgreSQL 基本等效于 PostgreSQL 11，任何兼容 PostgreSQL 线缆协议的客户端工具都可以访问 PolarDB 集群。
Pigsty 的 PGSQL 仓库中提供了 EL7 / EL8 的 PolarDB PG 开源版安装包，但不会在 Pigsty 安装时下载到本地软件仓库。
如果您需要 PolarDB PG 的离线安装支持，请考虑我们的 专业版
安装
如果您的环境有互联网访问，您可以使用以下方式，直接将 Pigsty PGSQL 及依赖仓库加入到节点上，
node_repo_modules: local,node,pgsql
然后在 pg_packages 中，使用 polardb 替换原生的 postgresql 软件包。
配置
以下参数需要针对 PolarDB 数据库集群进行特殊配置：
#----------------------------------#
# PGSQL & PolarDB
#----------------------------------#
pg_version: 11
pg_packages: [ 'polardb patroni pgbouncer pgbackrest pg_exporter pgbadger vip-manager' ]
pg_extensions: [ ] # do not install any vanilla postgresql extensions
pg_mode: polar # PolarDB Compatible Mode
pg_default_roles: # default roles and users in postgres cluster
- { name: dbrole_readonly ,login: false ,comment: role for global read-only access }
- { name: dbrole_offline ,login: false ,comment: role for restricted read-only access }
- { name: dbrole_readwrite ,login: false ,roles: [dbrole_readonly] ,comment: role for global read-write access }
- { name: dbrole_admin ,login: false ,roles: [pg_monitor, dbrole_readwrite] ,comment: role for object creation }
- { name: postgres ,superuser: true ,comment: system superuser }
- { name: replicator ,superuser: true ,replication: true ,roles: [pg_monitor, dbrole_readonly] ,comment: system replicator } # <- superuser is required for replication
- { name: dbuser_dba ,superuser: true ,roles: [dbrole_admin] ,pgbouncer: true ,pool_mode: session, pool_connlimit: 16 ,comment: pgsql admin user }
- { name: dbuser_monitor ,roles: [pg_monitor] ,pgbouncer: true ,parameters: {log_min_duration_statement: 1000 } ,pool_mode: session ,pool_connlimit: 8 ,comment: pgsql monitor user }
这里特别注意，PolarDB PG 要求 replicator 复制用户为 Superuser，与原生 PG 不同。
扩展列表
绝大多数 PGSQL 模块的 扩展插件 （非纯 SQL 类）都无法直接在 PolarDB 内核上使用，如果需要使用，请针对新内核从源码重新编译安装。
目前 PolarDB 内核自带了以下 61 个扩展插件，除去 Contrib 扩展外，提供的额外扩展包括：
polar_csn1.0 : polar_csnpolar_monitor1.2 : examine the polardb informationpolar_monitor_preload1.1 : examine the polardb informationpolar_parameter_check1.0 : kernel extension for parameter validationpolar_px1.0 : Parallel Execution extensionpolar_stat_env1.0 : env stat functions for PolarDBpolar_stat_sql1.3 : Kernel statistics gathering, and sql plan nodes information gatheringpolar_tde_utils1.0 : Internal extension for TDEpolar_vfs1.0 : polar_vfspolar_worker1.0 : polar_workertimetravel1.0 : functions for implementing time travelvector0.5.1 : vector data type and ivfflat and hnsw access methodssmlar1.0 : compute similary of any one-dimensional arrays
PolarDB 可用的完整插件列表：
| name | version | comment |
|---|---|---|
| hstore_plpython2u | 1.0 | transform between hstore and plpython2u |
| dict_int | 1.0 | text search dictionary template for integers |
| adminpack | 2.0 | administrative functions for PostgreSQL |
| hstore_plpython3u | 1.0 | transform between hstore and plpython3u |
| amcheck | 1.1 | functions for verifying relation integrity |
| hstore_plpythonu | 1.0 | transform between hstore and plpythonu |
| autoinc | 1.0 | functions for autoincrementing fields |
| insert_username | 1.0 | functions for tracking who changed a table |
| bloom | 1.0 | bloom access method - signature file based index |
| file_fdw | 1.0 | foreign-data wrapper for flat file access |
| dblink | 1.2 | connect to other PostgreSQL databases from within a database |
| btree_gin | 1.3 | support for indexing common datatypes in GIN |
| fuzzystrmatch | 1.1 | determine similarities and distance between strings |
| lo | 1.1 | Large Object maintenance |
| intagg | 1.1 | integer aggregator and enumerator (obsolete) |
| btree_gist | 1.5 | support for indexing common datatypes in GiST |
| hstore | 1.5 | data type for storing sets of (key, value) pairs |
| intarray | 1.2 | functions, operators, and index support for 1-D arrays of integers |
| citext | 1.5 | data type for case-insensitive character strings |
| cube | 1.4 | data type for multidimensional cubes |
| hstore_plperl | 1.0 | transform between hstore and plperl |
| isn | 1.2 | data types for international product numbering standards |
| jsonb_plperl | 1.0 | transform between jsonb and plperl |
| dict_xsyn | 1.0 | text search dictionary template for extended synonym processing |
| hstore_plperlu | 1.0 | transform between hstore and plperlu |
| earthdistance | 1.1 | calculate great-circle distances on the surface of the Earth |
| pg_prewarm | 1.2 | prewarm relation data |
| jsonb_plperlu | 1.0 | transform between jsonb and plperlu |
| pg_stat_statements | 1.6 | track execution statistics of all SQL statements executed |
| jsonb_plpython2u | 1.0 | transform between jsonb and plpython2u |
| jsonb_plpython3u | 1.0 | transform between jsonb and plpython3u |
| jsonb_plpythonu | 1.0 | transform between jsonb and plpythonu |
| pg_trgm | 1.4 | text similarity measurement and index searching based on trigrams |
| pgstattuple | 1.5 | show tuple-level statistics |
| ltree | 1.1 | data type for hierarchical tree-like structures |
| ltree_plpython2u | 1.0 | transform between ltree and plpython2u |
| pg_visibility | 1.2 | examine the visibility map (VM) and page-level visibility info |
| ltree_plpython3u | 1.0 | transform between ltree and plpython3u |
| ltree_plpythonu | 1.0 | transform between ltree and plpythonu |
| seg | 1.3 | data type for representing line segments or floating-point intervals |
| moddatetime | 1.0 | functions for tracking last modification time |
| pgcrypto | 1.3 | cryptographic functions |
| pgrowlocks | 1.2 | show row-level locking information |
| pageinspect | 1.7 | inspect the contents of database pages at a low level |
| pg_buffercache | 1.3 | examine the shared buffer cache |
| pg_freespacemap | 1.2 | examine the free space map (FSM) |
| tcn | 1.0 | Triggered change notifications |
| plperl | 1.0 | PL/Perl procedural language |
| uuid-ossp | 1.1 | generate universally unique identifiers (UUIDs) |
| plperlu | 1.0 | PL/PerlU untrusted procedural language |
| refint | 1.0 | functions for implementing referential integrity (obsolete) |
| xml2 | 1.1 | XPath querying and XSLT |
| plpgsql | 1.0 | PL/pgSQL procedural language |
| plpython3u | 1.0 | PL/Python3U untrusted procedural language |
| pltcl | 1.0 | PL/Tcl procedural language |
| pltclu | 1.0 | PL/TclU untrusted procedural language |
| polar_csn | 1.0 | polar_csn |
| sslinfo | 1.2 | information about SSL certificates |
| polar_monitor | 1.2 | examine the polardb information |
| polar_monitor_preload | 1.1 | examine the polardb information |
| polar_parameter_check | 1.0 | kernel extension for parameter validation |
| polar_px | 1.0 | Parallel Execution extension |
| tablefunc | 1.0 | functions that manipulate whole tables, including crosstab |
| polar_stat_env | 1.0 | env stat functions for PolarDB |
| smlar | 1.0 | compute similary of any one-dimensional arrays |
| timetravel | 1.0 | functions for implementing time travel |
| tsm_system_rows | 1.0 | TABLESAMPLE method which accepts number of rows as a limit |
| polar_stat_sql | 1.3 | Kernel statistics gathering, and sql plan nodes information gathering |
| tsm_system_time | 1.0 | TABLESAMPLE method which accepts time in milliseconds as a limit |
| polar_tde_utils | 1.0 | Internal extension for TDE |
| polar_vfs | 1.0 | polar_vfs |
| polar_worker | 1.0 | polar_worker |
| unaccent | 1.1 | text search dictionary that removes accents |
| postgres_fdw | 1.0 | foreign-data wrapper for remote PostgreSQL servers |
- Pigsty 专业版提供 PolarDB 离线安装支持，扩展插件编译支持，以及针对 PolarDB 集群进行专门适配的监控与管控支持。
- Pigsty 与阿里云内核团队有合作，可以提供有偿内核兜底支持服务。
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