Database Administrator

I. PrefaceIn the past, because the table design was complex (multiple tables have direct master-slave relationships with tables), this was determined by the business logic. The insertion efficiency is simply intolerable and must be optimized. After

The following are common SQL statements used by SQL Server and Access to operate database structures.The content is organized by HAI wa. if the content is incorrect or incomplete, please submit it. Thank you.Create a table:Create table [table name]([

Create a table as defined in the target table;Add a constraint to the table to ensure that the table data is in the target partition;Alter table source table switch to target table partition NumberThe partition number can be obtained through $

Ii. Encrypted Database Password You can use GoldenGate to encrypt some database passwords. There are roughly three types of database passwords that can be encrypted. The password used to log on to the database by GoldenGate Extract, Replicat, and

Followed by the above article: http://ixdba.blog.51cto.com/2895551/880511 14. Install Oracle Clusterware 1) decompress the Software PackageAssume that all the database software is in the/rac directory. First, extract the two Oracle software packages

Share a self-written mysql automatic backup script, timed execution settings, and windows automatic FTP. Please advise. Prerequisites: vsftpd is enabled on the mysql database server, and an appropriate account is configured for FTP Step 1: Compile

The general paging method is like the following:The so-called "three-layer nesting" Statement), SELECT *   FROM   (SELECT a.*                 ,rownum rn           FROM   (SELECT * FROM table_name) a           WHERE  rownum  WHERE  rn >

Preface It is not enough to install the Oracle software. We still need to create a database on it before learning Oracle normally. Let's take a look at how to create a database. Oracle Configuration Assistant Database Configuration Assistant (DBCA)

ORACLE common error: ORA-00845: MEMORY_TARGET not supported on this system 1. Question proposal The following error is reported: [oracle@night ~]$ sqlplus /nologSQL*Plus: Release 11.2.0.1.0 Production on Thu Jul 25 15:39:40 2013Copyright (c) 1982,

Complete mysql backup and recovery practices 1. Environment Settings between backup Databases 1. Create Database test1, create table tt, and insert the following data mysql> create database test1;Query OK, 1 row affected (0.04 sec)mysql> use

The following table collects almost all views or aliases in the Oracle Data Dictionary. Use the 'describe' statement to query the fields of each view or Alias. Description: In the Oracle Data dictionary, the object names are mostly "USER. "," ALL. ",

Introduction to Introduction The new MySQL 5.0 feature tutorial is intended for old MySQL users who need to know the new features of MySQL 5.0. Simply put, I introduced the "Stored Procedure, trigger, view, and Information Architecture View". I

Oracle claims that the installation of the Oracle9i database in Linux requires at least MB of memory and at least 1 GB or two times of memory swap space. For servers with a system memory larger than 2 GB, the swap space can be between 2 gb-4gb. If

10 Gb databases can use more new optimizer hints to control optimization behavior. Now let's quickly parse these powerful new hints: 1. spread_min_analysis With this hint, you can ignore the Compilation Time Optimization rules for workbooks such as

MySQL database is an open source database based on structured data. SQL statements are the core language of MySQL databases. However, when executing SQL statements in the MySQL database, you need to be careful with two traps. Trap 1: NULL values are

1. select an appropriate ORACLE optimizer There are three optimizer types in ORACLE: A. RULE (RULE-based) B. COST (COST-based) c. CHOOSE (selectivity)Set the default optimizer. various declarations of the OPTIMIZER_MODE parameter in the ora file,

In a large database, performance has become one of the focuses of attention. How to Make the efficient and effective operation of the database become an issue that must be considered by database administrators and developers."Good

What is a flashback recovery zone? Oracle 10g has a new feature called Automatic Disk-Based Backup and Recovery ). The basis for implementing this function is the Flash Recovery Area described in this article ). Flash recovery zone is a new feature

[Q] How to restrict specific IP addresses to access the database [A] You can use the logon trigger, cmgw, or add A protocol under $ OREACLE_HOME/network/admin. ora file (Some OS may be. protocol. ora), 9i can directly modify sqlnet. ora: Add the

Please follow these steps. Do not take the following steps if the previous steps are not performed to avoid damage to your database. Generally, steps 4 and 6 are not recommended. Steps 4 are not secure and may damage the database or cause data loss.