PostgreSQL's FDW supports the feature to obtain statistics of the foreign tables to estimate the plan tree of a query, which are used by some FDW extensions, such as postgres_fdw, mysql_fdw, tds_fdw and jdbc2_fdw. If the use_remote_estimate option is set to on using the ALTER SERVER ...
The Internals of PostgreSQL : Introduction (interdb.jp) Introduce PostgreSQL is a well-designed open-source multi-purpose relational database system which is widely used throughout the world. It is one huge system with the integrated subsystems, each of which has a particular complex feature and...
The results of the EXPLAIN command could not be used by other DBMS fdw extensions for planning. For example, mysql’s EXPLAIN command only returns the estimated number of rows; however, PostgreSQL’s planner needs more information to estimate the cost as described in Chapter 3. Deparesing 为了...
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This section provides an overview of query processing in PostgreSQL. 本节概述了 PostgreSQL 中的查询处理。 Part 2: Sections 3.2. — 3.4. 第2 部分:第 3.2 节— 3.4. This part explains the steps followed to obtain the optimal plan of a single-table query. In Sections 3.2 and 3.3, ...
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“Redgate has definitely been a game-changer when it comes to looking into the internals of the SQL servers that we’re monitoring, and how we communicate with Operations.” Paw Jershauge, Database Architect The Solution When he evaluated Redgate Monito...