advanced oracle sql tuning

Oracle 10g Advanced Replication instances (multi-agent replication)Objective:Configured three times, two is one way. The last time is finally two-way. Also a little bit of success in the joy. Joy? Joy does not. It's such a simple thing that I feel ashamed for so long. A lot of data on the network. But they seem to have a bit of a casual writing. Sometimes a little bit of error can make you only have to redo

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(7876, ' ADAMS ', ' clerk ', 7788, to_date (' 23-05-19 "Dd-mm-yyyy"), 1100, NULL, +); insert into EMP (empno, ename, Job, Mgr, HireDate, Sal, Comm, Deptno) nbs P values (7900, ' JAMES ', ' clerk ', 7698, to_date (' 03-12-1981 ', ' dd-mm-yyyy '), 950, NULL, +); insert into EMP (em Pno, ename, Job, Mgr, HireDate, Sal, Comm, Deptno) values (7902, ' FORD ', ' ANALYST ', 7566, To_date (' 03-12-1981 ', ' dd-mm-yyyy '), +, NULL, +); insert into EMP (empno, ename, Job, Mgr, HireDate, Sal, Comm, De

Tags: truncate TABLE distinct delete table egexp likeThe commonly used Structured query language consists of data definition language (DDL), Data Manipulation language (DML), Data Control Language (DCL) and data Query Language (DQL). Especially in relational databases such as (MySQL, mariadb, Percona, DB2, Oracle, SQL Server) are all using common SQL statements t

recordsCreate a DEFAULT constraint for a column when the table is createdThe following SQL creates a default constraint for the "City" column when the "Persons" table is created:Mysql/sql Server/oracle/ms AccessCREATE TABLE Persons ( id_p int not NULL, LastName varchar (255) is not NULL, FirstName varchar (255), Address varchar (255), City varchar

revocation indexes, tables, and databases SQL DROP INDEX statement Syntax for Microsoft Sqljet (and Microsoft Access): DROP INDEX index_name on table_name Syntax for MS SQL Server: Drop INDEX Table_name.index_name For IBM DB2 and Oracle syntax: Drop INDEX Index_name Syntax for MySQL: ALTER TABLE table_name DROP INDEX Index_name

Obtain SQL Execution plans from the most authoritative Oracle Database 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. In addition, the meanings and usage of

original link: http://www.oracle-developer.net/display.php?id=411Oracle Advanced Queuing IntroductionAdvanced Queuing Advance Queuing (AQ) is available in multiple versions of Oracle. He is Oracle native messaging software and is being strengthened in every version.This article provides a high-level overview of AQ. In particular, we will see how to start a queue

Oracle-based SQL Optimization MethodologyThe ultimate goal of SQL Optimization in Oracle databases is to shorten the execution time of target SQL statements. To achieve the above purpose, we usually have the following three methods to choose from:1. Reduce the resource consu

, for the program ape, this is intolerable, because this is only a circular query, not other business code.Well, there's no better way, the answer is yes, one of them is dynamic sql:First on the code: SelectId="Dynamicforeachtest" Resulttype="Com.blog.Blog" ParameterType="Java.util.List"> Select * fromBlogwhereAuthorinch foreach Collection="List"Index="IndexThe item="Item"Open="(" Separator=","Close=")">#{item}Foreach>Select> The TEM represents the alias of each element in the coll

The basic usage of grouping functions is described earlier, and several more advanced uses of group by are described below. 1, rollup in Oracle database with the GROUP BY command, you can provide summary of information functions (similar to subtotals) Sql> SELECT Deptno, Job,sum (SAL) from EMP1 Group by Deptno,job 2 order by Deptno,job; DEPTNO JOB SUM (SAL)