If you do not specify INTO table_name, the execution plan is stored in the PLAN_TABLE table by default. SET statement_id The statement ID of the explained SQL statement, which can be used to query the execution plan of the statement later. If you do not specify SET statement_id, an ...
ClickHouse是俄罗斯的Yandex于2016年开源的列式存储数据库(DBMS),使用C++语言编写,主要用于在线分析处理查询(OLAP),能够使用SQL查询实时生成分析数据报告。 OLAP(On-Line Analytical Processing)翻译为联机分析处理,专注于分析处理,从对数据库操作来看,OLAP是对数据的查询; OLTP(on-line transaction processing)翻译为联机...
More information on the DBMS_XPLAN package can be found in the Oracle® Database PL/SQL Packages and Types Reference guide. 6 THE ORACLE OPTIMIZER EXPLAIN THE EXPLAIN PLAN What is Cost? The Oracle Optimizer is a cost-based optimizer. The execution plan selected for a SQL statement is just...
数据库 大数据 数据 Distributed 存储数据 clickhouse数据库 aes加密 clickhouse查看数据库 ClickHouse之入门学习(1)一 ClickHouse 是什么 ? ClickHouse是一个用于"联机分析"(OLAP)的列式数据库管理系统(DBMS:Database Managerment System),简称CH ,主要用于 “在线分析处理查询”(OLAP:Online Analytical Processing),能够...
DISTSQLReturn the statement plan and performance statistics as well as a generated link to a graphical distributed SQL physical statement plan tree. SeeDISTSQLoption. DEBUGGenerate a ZIP file containing files with detailed information about the query and the database objects referenced in the query....
Data Information Knowledge Data Information Knowledge in IS Answer and Explanation: Value of Knowledge in IS: In an Information system, the components Data, Information, and knowledge are connected with each other. Data represents... Learn more about this topic: ...
通过分片把一份完整的数据进行切分,不同的分片分布到不同的节点上,再通过 Distributed 表引擎把数据拼接起来一同使用。 Distributed 表引擎本身不存储数据,有点类似于 MyCat 之于 MySql,成为一种中间件,通过分布式逻辑表来写入、分发、路由来操作多台节点不同分片的分布式数据。 注意:ClickHouse 的集群是表级别的,...
More information on the DBMS_XPLAN package can be found in the Oracle® Database PL/SQL Packages and Types Reference guide. 6 THE ORACLE OPTIMIZER EXPLAIN THE EXPLAIN PLAN What is Cost? The Oracle Optimizer is a cost-based optimizer. The execution plan selected for a SQL statement is just...
More information on the DBMS_XPLAN package can be found in the Oracle® Database PL/SQL Packages and Types Reference guide. 6 THE ORACLE OPTIMIZER EXPLAIN THE EXPLAIN PLAN What is Cost? The Oracle Optimizer is a cost-based optimizer. The execution plan selected for a SQL statement is ...
A method for selectively preparing customized reports of query explain data comprises selectively retrieving from the database subsets of the query explain data for the at least one query statement; f