Download of pg_hint_plan for PostgreSQL 12 1.3.5 (pg_hint_plan12-1.3.5-1.el7.x86_64.rpm: 33,436 字节) will begin shortly. If not so, click pg_hint_plan12-1.3.5-1.el7.x86_64.rpm.
PostgreSQL executes queries using cost-based optimizer, and sometimes fails to choose most optimized execution plan or some types of queries. In such cases, pg_hint_plan helps users to guide the planner to choose the plans they want by putting some nstructions - call them hints - in the comments prefixed to the SQL statement body. No need to rewrite statement tself nor change some GUC parameters elsewhere.
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