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support pg_textsearch
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‎CN/modules/ROOT/nav.adoc‎

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*** xref:master/ecosystem_components/wal2json.adoc[wal2json]
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*** xref:master/ecosystem_components/pg_stat_monitor.adoc[pg_stat_monitor]
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*** xref:master/ecosystem_components/pg_ai_query.adoc[pg_ai_query]
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*** xref:master/ecosystem_components/pg_textsearch.adoc[pg_textsearch]
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* 监控运维
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** xref:master/getting-started/daily_monitoring.adoc[日常监控]
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** xref:master/getting-started/daily_maintenance.adoc[日常维护]

‎CN/modules/ROOT/pages/master/ecosystem_components/pg_textsearch.adoc‎

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= pg_textsearch
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== 概述
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pg_textsearch 是由Timescale团队开发的一个PostgreSQL扩展，旨在为Postgres提供高性能、现代化的全文搜索能力，并针对AI工作负载和混合搜索进行了优化。
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== 安装
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[TIP]
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源码安装环境为 Ubuntu 24.04(x86_64)，环境中已经安装了IvorySQL5及以上版本，安装路径为/usr/ivory-5
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=== 源码安装
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[literal]
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----
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# 从 wget https://github.com/timescale/pg_textsearch/archive/refs/tags/v0.6.1.tar.gz 下载源码包
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tar xzvf v0.6.1.tar.gz
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cd pg_textsearch-0.6.1
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# 编译安装插件
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make PG_CONFIG=/usr/ivory-5/bin/pg_config
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make PG_CONFIG=/usr/ivory-5/bin/pg_config install
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----
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[TIP]
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如果出现找不到xlocale.h的错误，需要手动修改 /usr/ivory-5/include/postgresql/server/pg_config.h
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删除或者注释掉 #define HAVE_XLOCALE_H 1 这一行
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=== 修改数据库配置文件
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修改 ivorysql.conf 文件，添加 pg_textsearch 到 shared_preload_libraries
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[literal]
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----
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shared_preload_libraries = 'gb18030_2022, liboracle_parser, ivorysql_ora, pg_textsearch'
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----
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重启数据库后配置生效。
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=== 创建Extension
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[literal]
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----
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postgres=# create extension pg_textsearch;
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WARNING: pg_textsearch v0.6.1 is a prerelease. Do not use in production.
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CREATE EXTENSION
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----
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== 使用
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创建一个带有文本内容的表：
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[literal]
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----
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postgres=# CREATE TABLE documents (id bigserial PRIMARY KEY, content text);
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CREATE TABLE
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postgres=# INSERT INTO documents (content) VALUES
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('PostgreSQL is a powerful database system'),
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('BM25 is an effective ranking function'),
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('Full text search with custom scoring');
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INSERT 0 3
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----
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在文本列上创建 pg_textsearch 索引
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[literal]
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----
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postgres=# CREATE INDEX docs_idx ON documents USING bm25(content) WITH (text_config='english');
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NOTICE: BM25 index build started for relation docs_idx
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NOTICE: Using text search configuration: english
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NOTICE: Using index options: k1=1.20, b=0.75
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NOTICE: BM25 index build completed: 3 documents, avg_length=4.33
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CREATE INDEX
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----
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使用@操作符获取最相关的文档：
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[literal]
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----
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postgres=# SELECT * FROM documents ORDER BY content <@> 'database system' LIMIT 5;
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id | content
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----+------------------------------------------
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1 | PostgreSQL is a powerful database system
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2 | BM25 is an effective ranking function
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3 | Full text search with custom scoring
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(3 rows)
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----
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‎EN/modules/ROOT/nav.adoc‎

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*** xref:master/ecosystem_components/pg_ai_query.adoc[pg_ai_query]
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*** xref:master/ecosystem_components/wal2json.adoc[wal2json]
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*** xref:master/ecosystem_components/pg_stat_monitor.adoc[pg_stat_monitor]
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*** xref:master/ecosystem_components/pg_textsearch.adoc[pg_textsearch]
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* Monitor and O&M
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** xref:master/getting-started/daily_monitoring.adoc[Monitoring]
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** xref:master/getting-started/daily_maintenance.adoc[Maintenance]

‎EN/modules/ROOT/pages/master/ecosystem_components/pg_textsearch.adoc‎

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= pg_textsearch
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== Overview
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pg_textsearch is a PostgreSQL extension developed by the Timescale team. It is designed to provide high-performance, modern full-text search capabilities for Postgres, and is optimized for AI workloads and hybrid search.
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== Installation
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[TIP]
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The source code installation environment is Ubuntu 24.04 (x86_64), in which IvorySQL 5 or a later version has been installed. The installation path is /usr/ivory-5.
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=== Source Code Installation
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[literal]
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----
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# download source code package from: https://github.com/timescale/pg_textsearch/archive/refs/tags/v0.6.1.tar.gz
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tar xzvf v0.6.1.tar.gz
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cd pg_textsearch-0.6.1
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# compile and install the extension
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make PG_CONFIG=/usr/ivory-5/bin/pg_config
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make PG_CONFIG=/usr/ivory-5/bin/pg_config install
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----
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[TIP]
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If there is error "xlocale.h: No such file or directory" during compilation, user should remove the
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line of "#define HAVE_XLOCALE_H 1" from file /usr/ivory-5/include/postgresql/server/pg_config.h.
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=== Modify the configuration file
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Modify the ivorysql.conf file to add pg_textsearch into shared_preload_libraries.
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[literal]
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----
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shared_preload_libraries = 'gb18030_2022, liboracle_parser, ivorysql_ora, pg_textsearch'
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----
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Then restart the database.
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=== Create Extension
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[literal]
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----
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postgres=# create extension pg_textsearch;
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WARNING: pg_textsearch v0.6.1 is a prerelease. Do not use in production.
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CREATE EXTENSION
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----
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== Use
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Create a table with text content:
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[literal]
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----
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postgres=# CREATE TABLE documents (id bigserial PRIMARY KEY, content text);
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CREATE TABLE
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postgres=# INSERT INTO documents (content) VALUES
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('PostgreSQL is a powerful database system'),
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('BM25 is an effective ranking function'),
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('Full text search with custom scoring');
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INSERT 0 3
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----
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Create a pg_textsearch index on the text column:
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[literal]
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----
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postgres=# CREATE INDEX docs_idx ON documents USING bm25(content) WITH (text_config='english');
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NOTICE: BM25 index build started for relation docs_idx
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NOTICE: Using text search configuration: english
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NOTICE: Using index options: k1=1.20, b=0.75
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NOTICE: BM25 index build completed: 3 documents, avg_length=4.33
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CREATE INDEX
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----
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Get the most relevant documents using the <@> operator:
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[literal]
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----
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postgres=# SELECT * FROM documents ORDER BY content <@> 'database system' LIMIT 5;
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id | content
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----+------------------------------------------
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1 | PostgreSQL is a powerful database system
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2 | BM25 is an effective ranking function
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3 | Full text search with custom scoring
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(3 rows)
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----

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