Database Administrator

MySQL slow Query There are some places where there are rivers and lakes and databases. The problem of SQL optimization is a long way to go. We can't help but have bad SQL. What should I do? Fortunately, all major databases have the collection

Routine maintenance and troubleshooting of Oracle 11G R2 slave uard 1. About the Forced Logging ModeSome DDL statements can avoid writing redo logs by specifying the NOLOGGING clause (the purpose is to increase the speed, which is indeed valid in

MySQL defines the exception and exception handling methods, and MySQL defines the handling methods In MySQL, specific exceptions must be handled. These exceptions can be associated with errors and general process control in subprograms. Defining

Classic database problems, classic databases 1. What are the advantages of stored procedures? Advantages of stored procedures: 1. Improved performance 2. Reduced network congestion 3. better consistency 4. Improved security mechanisms 2. What is a

Error: 'Can't connect to local MySQL server through socket '/var/lib/mysql. sock' (2) ', connectmysql. sock[Root @ luozhonghua ~] #/Usr/bin/mysqladmin-u root password 'aaaaa'/Usr/bin/mysqladmin: connect to server at 'localhost' failedError: 'Can't

1. The control file contains the data to be loaded. First, create a test table. SQL> showUser USERIs"ING" SQL>Create TableDept 2 (deptno number (10)ConstraintDept_pkPrimary Key, 3 dname varchar2 (20 ), 4 loc varchar2 (20 )); The table has

Global Database ranking in December 2017: the decline of SQL Server was remarkable. MariaDB, which was just invested by Alibaba, performed well. Program ape (No.: imkuqin) yuanmei Compilation Source:

Learning MongoDB 8: MongoDB index (index restrictions) (2), mongodb IndexI. Introduction In the previous article, we introduced basic index operations through db. collection. the createIndex (keys, options) syntax creates an index. We will continue

The following article mainly introduces the actual usage of the MySQL update statement. We first use the UPDATE statement of a single table to introduce the actual solution for implementing the MySQL update statement. The following is the detailed

Introduction:Reference a section in the MySQL official document: the MERGE storage engine, also known as the MRG_MyISAM engine, is a set of identical MyISAM tables that can be used as one. "same" means that all tables share the same column and index

Quick grasp of Oracle Golden Gate 650) this. width = 650; "id =" aimg_104370 "src =" http://www.bkjia.com/uploads/allimg/131228/21511KO9-0.jpg "zoomfile =" http://www.bkjia.com/uploads/allimg/131228/21511KO9-0.jpg "file ="

Basic SQL syntax and basic SQL statements A table that may be involved in an SQL statement: StudentInfo: PersonInfo: Test_outjoin: Test2_outjoin: Ii. Basic SQL syntax If exists (select * from dbo. sysobjects where name = 'studentinfo') -- Query

Problem: we have used a large number of distributed transactions and are studying database images to make one of our key databases highly available. During the test, we found that distributed transactions sometimes fail after trying to transfer the

Use Cases I remember when I was tuning for a company, the person in charge sent me a bunch of business T-SQL scripts, I am still calm in the face of massive scripts, although I do not understand the internal complex business, however, we have to

Solve the Problem of CPU resource depletion caused by a large number of latch free databases in production. latchfree At noon, the cpu of a database we produced remained high. Using the following SQL statement, we can view the database waiting and

Atitit. Gui control and panel ---- db database zone -----. database comparison and synchronization tool vOa, atitit. gui ---- db Atitit. Gui control and panel ---- db database zone -----. database comparison and synchronization tool vOa   1. Entrust

Analysis of Three-tier architecture, analysis of three-tier architectureThree-tier architectureLet's take a preliminary look at the three-tier architecture through several questions.1. What is a three-tier architecture?2. Application Scenario-why

Navicat 1577-Cannot proceed because system tables used by Event Scheduler where found damaged at s, navicat Problem: Today, Navicat is used. However, when a new mysql instance is connected, no matter whether a database is opened, the system prompts 1

Oracle Database 10 Gb provides a secure and scalable foundation for Oracle Identity Management. The Oracle Internet Directory (OID) is implemented as an application running on the Oracle database at 10 Gb, this allows the OID to support several

Case study: Create a 20 GB tablespace In the DB2 database of the AIX system. The specific SQL statements are as follows: CREATE REGULAR TABLESPACE HTDC_DATA PAGESIZE 8 K MANAGED BY DATABASE USING ( FILE ’/db2_tag/TABLE_SPACES/HTDC_DATA/HTDC_