Database Administrator

Introduction to IntroductionThe 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 would

Most server administrators know that the MySQL database management system (RDBMS) is a highly flexible software block with a wide range of startup options that can be used to modify related behaviors. However, most people do not know that the

Basic Requirements1. master the basic concepts of computer systems and software, basic knowledge of computer networks and application knowledge, and basic concepts of information security.2. master the basic knowledge of data structures and

The MySQL administrator should know how to set up the MySQL user account and specify which user can connect to the server, where to connect, and what to do after the connection. MySQL 3.22.11 introduces two statements to make this work easier: GRANT

MySQL has a lot of basic commands, and the show command is also one of them. In many users, the use of the show command is also prone to confusion. This article summarizes the many usage of the show command.A. show tables or show tables from

Environment:OS: CentOS4.4Oracle: oracle10gr1(the installation software is 10201_database_linux32.zip. It has not been upgraded to R2 and does not affect the following configuration)Primary: 192.168.0.5 (host name RAC1)Standby: 192.168.0.7 (host name

MySQL has quietly announced that it will not release the MySQL Enterprise Edition server as a tar package, less than a year after the company announced that it would divide MySQL into the free and paid versions. Although its Enterprise Edition

Since yesterday, I planned to install Linux on a machine in the lab. I was going to install Red Hat9, but I am always a bit old. But who told us to have the RedHat9 book. However, if the disk is put in a boot installationBlablablaKernel panic ..Ft.

I. CREATE TABLE Method Full table replication # create table new table select * from old table;Structure replication # create table new table select * from old table where 1 <> 1; Ii. insert into Method Get the table creation statement # show

System Requirements for Oracle databases Under SUSE Linux10: Memory: 1 GB or above is recommended Swap partition: Set to 2 times of memory /Tmp disk space: More than MB Disk Space: Software 3.5 GB Data 1.2 GB Required software: SuSE Linux10

I have installed Multiple MySQL service notes in the Linux environment. For more information, see! 1. Install it as usual.[Root @ ff_girl mysql5122] # chown-R root.[Root @ ff_girl mysql5122] # chown-R mysql data[Root @ ff_girl mysql5122] # chgrp-R

We all know that Oracle will automatically handle deadlocks without human intervention, but Oracle cannot handle session blocking on its own. Blocking leads to resource waste and system performance consumption, at this time, we need to quickly find

# Creating a database Create database why; # Creating a user table Create table why (employee_id bigint, name char (16), gerder enum ('M', 'F'), dept_id enum ('caiwu', 'renshi ', 'shichang ', 'jishu'), join_time date, salary double, phone char (11),

-- 1. error message:> EXP-00008: Oracle error 4031 encountered> ORA-04031: unable to allocate 4096 bytes of shared memory("Shared pool", "BEGIN: EXEC_STR: = SYS. DBMS...", "PL/SQL MPCODE", "BAMIMA: Bam Buffe-- II. Cause of error:-- The shared memory

Natural connection Select * From r1 natural [inner] join r2 natural [inner] join r3 Where P;   Select A1, A2 From r1 Natural [inner] joinR2, r3 where r2.A = r3. B; In the natural connection, all columns with the same attribute name in the matching

Software Environment Windows 2000 + Oracle9iHardware environment CPU 1.8G + RAM 512 M Now we have two tables:T1 -- large table 10000 T1_FK_IDT2 -- small table 5000 T2_PK_IDT1 is associated with the primary key ID of T2. The simulation data is as

Scenario: Because "SNAPPY" is not installed in hbase in the Intranet test environment Alter 'trojaninfo', {NAME => 'I', COMPRESSION => 'snappy '} Force Delete table: 1. Force delete all files of the table on hdfs (The Path depends on the actual

SQL statements used to query and delete duplicate records in Oracle 1. Search for redundant duplicate records in the Table. duplicate records are determined based on a single field (Id ). Select * from table where Id in (select Id from Table group

Before Oracle 11g, you can run the show errors command to view the errors that occurred when executing pl/SQL statements, but these errors cannot be recorded. Now, you can run the SQL plus command set errorlogging on, write errors caused by SQL or

How to deal with the problem that the undo tablespace is too large(1) -- create an undo tablespace for a new small spaceCreate undo tablespace undotBS4 datafile 'C: \ Oracle \ oradata \ dzq \ eoffice \ undotbs4.dbf' size 500 m;(2) -- set the new