advanced oracle sql tuning

The following are some of the Oracle functions-advanced: 1. CATSTR example: SELECTCATSTR (COLUMN_NAME) NAME_LISTFROMDBA_TAB_COLUMNSWHERETR The following are some of the Oracle functions-advanced: 1. CATSTR example: select catstr (COLUMN_NAME) NAME_LIST FROM DBA_TAB_COLUMNS WHERE TR Below are some of the

This article briefly introduces ORACLE's advanced replication capabilities and, through a practical project, discusses how to use advanced replication to achieve data unification within and outside the network in level two db, and finally gives a configuration script for your reference. 　　 1. Basic Concepts ORACLE 　　

In Oracle SQL queries, Oracle provides advanced features that simplify SQL query statements and improve query performance. The usage and differences of Rollup,cube are described below. 1. RollupRollup can calculate subtotals and totals for multiple levels of a specified grou

) package. gif "alt=" Wkiol1fapknzzvsxaacnzcxjs7s889.gif-wh_50 "/>Course Content:01. Storage Backup Disaster Recovery Technology video training course02.Oracle Database Backup Recovery Basics Explained03. Install oracle11g database and base on Linux04.Oracle DB Instance Core technical analysis (underlying analytics)05.Oracle control file and parameter file manage

Empno,ename,sal,deptnoFrom EMP WHERE sal>2000ORDER by Deptno;Intersect is used to get the intersection of several query result sets, returning only records that exist simultaneously in several query result set. At the same time, the final result set returned is sorted by the first column by default.For example, query the employee number, employee name, payroll, and Department number in department 30th with a salary greater than 2000, with the statement:Sql> SELECT Empno,ename,sal,deptnoFrom EMP

Use the emp, dept, and other tables under the scott user as an example, and use sqlplus for demonstration. First, create two blank e1, e2: SQL code SQL> create table e1 as select ename, sal, hiredate from emp where 1 = 2; The table has been created. SQL> create table e2 as select ename, deptno, mgr from emp where 1 = 2; The table has been created.

Rollup and cube, oralcerollup of Oralce advanced SQLIn oracle SQL query, oracle provides some advanced functions to simplify SQL query statements and improve query performance. The following describes the usage and difference of r

):INSERT into Persons (firstname,lastname) VALUES (' Bill ', ' Gates ')The SQL statement above inserts a new record in the "Persons" table. "P_ID" will be given a unique value. "FirstName" will be set to "Bill", "LastName" column will be set to "Gates".Syntax for Oracle in Oracle, the code is a little bit more complicated.You must create a auto-increment field (t

This document is compiled and summarized based on relevant information. It mainly describes the most authoritative and correct methods and steps for obtaining SQL statement execution plans in Oracle databases. This document is compiled and summarized based on relevant information. It mainly describes the most authoritative and correct methods and steps for obtaining SQL