Database Administrator

Several factors affecting data retrieval efficiency (1) There are two main forms of data retrieval. The first type is database-only. A typical structure is a relational data, such as mysql. You can use SQL to express the required data. mysql

MHA Routine Management MHA is the best choice for many enterprises that use MySQL databases for high availability. It is easy to use and powerful, and implements automatic master-slave failover Based on the MySQL replication architecture. This

Considerations for converting MySQL to Oracle: mysqloracleLimit ---> oracle paging,Dateformat ---> oracle date formatting,Now () ----> get the system time,In MySQL, It is a keyword instead of a keyword in oracle. Mysql Oracle

Install Mysql in win7 and start it automatically. 1. Download and install MySql. I use mysql_5.6.24_winx64_xiazaba and decompress it to a disk. Here I install it on disk D, D: \ install \ MySQL Server 5.6. 2. set the system environment variables.

Oracle Database comprehensive questions, oracle Database questions Table Structure Description: Create table employee ( Id number (10) not null, -- employee id Salary number (10, 2) default 0 not null, -- salary Name varchar2 (24) not null -- name );

Oracle copy column value, oracle copy Column Requirement: Add a field to an existing table in the test environment, and manually add data to this column of some data in the table, now you want to add this field in the formal environment and copy

Dynamic Registration listening and dynamic listeningSQL> select * from v $ version where rownum = 1;BANNER--------------------------------------------------------------------------------Oracle Database 11g Enterprise Edition Release

Dell shareplex and HVR data replication software, shareplexhvr Today I have a general understanding of Dell shareplex data replication software, web site: http://software.dell.com/products/shareplex/ You can see from this URL,Shareplex is the

PreparedStatement and Statement, preparedstatement PreparedStatement is one of the APIs used to execute SQL query statements. Java provides Statement, PreparedStatement, and CallableStatement to execute query statements. Statement is used for

How to do a master table with a foreign key Association The primary and Foreign keys are mandatory associations between two tables provided by the database. They can also be implemented at the application layer. Advantages

Standard (important) for mysql Data Types 1. allowed value: the range and type of values in a field are allowed to determine which data type is the most direct factor to add to this field. 2. storage efficiency: it is also important to consider

MySQL: modifying columns in a table Modifying columns in a MySQL table Modify the column syntax in the table:Create a table with N columns. You can also add, delete, or modify columns. Alter table name add column name column type column parameter;

Centos6.5 install mysql5.6 and centos6.5mysql5.61. Check the version number first. # uname -a2. Download and install Mysql's yum Repository Download the yum repository of Mysql Http://dev.mysql.com/downloads/repo/yum/ Then install the repository

Mysql innodb insert intention lock, mysqlinnodb Innodb has an insert intention lock, specifically for Insert. If the gap is already locked by the gap before insertion, insert will apply for the Insert intention lock. So what is the role of this

Oracle compiler warning: oracle Compiler Compiler Warnings Compiler warningOracle 10g allows you to enable compile-time warnings that are useful to identify potential run-time problems in your programs. these warnings are not serious enough to raise

Solution for oracle Database not opened, oracle DatabaseMicrosoft Windows [version 6.1.7601]Copyright (c) 2009 Microsoft Corporation. All rights reserved.C: \ Users \ Administrator>C: \ Users \ Administrator> sqlplus/as sysdba;SQL * Plus: Release 11.

Import excel Data to oracle and data to oracle If you want to import excel data to an oracle table, the columns in excel are the same as those in the oracle table. The content and table in excel are as follows: Copy and paste the excel content

View the version of the remote Redis server and the redis Server View the version of the remote Redis Server How to view the version of a remote Redis Server Author: chszs, reprinted with note. Blog homepage: http://blog.csdn.net/chszs What should

MongoDB introduction, installation, and setup of a simple mongoDB server (1 ).Related Websites 1. http://www.mongodb.org/official website, you can download the installation program, and doc, and driver. 2. http://www.mongoing.com/domestic

Clustered and non-clustered indexes, I. An in-depth understanding of the index structureIn fact, you can think of indexes as a special directory. Microsoft's SQL SERVER provides two types of indexes: clustered index (also called clustered index and