Summary: Optimizer hint on PostgreSQL 12 Name: pg_hint_plan13 Version: 1.3.7 Name: pg_hint_plan14 Version: 1.4 Release: 1%{?dist} License: BSD Group: Applications/Databases @@ -26,28 +26,28 @@ BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-%(%{__id_u} -n) Vendor:...
AI代码解释 explain select*from sch1.student where sname='be12b';QUERYPLAN---Index Scan using idx10 onstudent(cost=0.29..8.31rows=1width=14)Index Cond:((sname)::text='be12b'::text)explain select/*+ IndexScan(student idx20) */*from sch1.student where sname='be12b';QUERYPLAN---Index...
The objects as the hint parameter should be enclosed by double quotes if they includes parentheses, double quotes and white spaces. The escaping rule is the same as PostgreSQL. pg_hint_planidentifies the target object by using aliases if exists. This behavior is usable to point a specific occu...
pg_hint_plan插件通过特殊的注释语句提示来调整既定的执行计划。 背景信息 PostgreSQL使用基于代价的优化器,优化路线使用统计数据而非固定的规则。对于一条SQL语句,优化器会去评估所有可能的代价并最终选择代价最低的去执行。优化器会尽力选择最好的执行计划,但由于其并不了解数据中可能存在的一些内在连接关系,导致这些执...
在postgresql.conf中修改shared_preload_libraries=‘pg_hint_plan’ 重启数据库 3 检查是否已经加载 pg_hint_plan加载后在extension里面是看不到的,所以需要确认插件是否已经加载 代码语言:javascript 代码运行次数:0 运行 AI代码解释 show session_preload_libraries; session_preload_libraries --- pg_hint_plan 或者...
参考 AliCloudDB for PostgreSQL pg_hint_plan插件的用法-阿里云开发者社区 http:///pg_hint_plan.htmlhttp:///hint_list.htmlhttps://yq.aliyun.com/articles/17212 PgSQL · 特性分析 · Plan Hint
14. 15. 16. 17. 18. 19. 基本配置 vi$PGDATA/postgresql.conf shared_preload_libraries='pg_hint_plan' pg_hint_plan.enable_hint=on pg_hint_plan.debug_print=on pg_hint_plan.message_level=log postgres=# create extension pg_hint_plan; ...
pg当前是支持HINT固定执行计划,需要通过扩展包pg_hint_plan来实现 一、扩展包下载: https://github.com/ossc-db/pg_hint_plan/releases 二、选择v15版本 pg_hint_plan151.5.1is released pg_hint_plan151.5.1is released.This version only supports PostgreSQL15.Some changes are made inthisrelease:Fix hint...
[postgres@ora19c02 data]$ vi postgresql.conf shared_preload_libraries = 'pg_hint_plan' # (change requires restart) 重启数据库 pg_ctl restart 配置错了的话就连不上数据库,如果配置错了,连接template1库执行 alter database postgres reset s...
[postgres@ora19c02 data]$ vi postgresql.conf shared_preload_libraries = 'pg_hint_plan' # (change requires restart) 重启数据库 pg_ctl restart 7.5 重置配置 配置错了的话就连不上数据库,如果配置错了,连接template1库执行alter database postgres reset session_preload_libraries; ...