Database Administrator

Method for Random access of 10 data entriesCopy codeThe Code is as follows:Select * from table order by rnd (id)The id in rnd (id) is the auto-increment field in the table.Access random display records (not repeated) SolutionCopy codeThe Code is as

Case when is convenient when different conditions require different return values. It can be used when assigning values to variables or in select query statements. (Exit immediately if one meets the requirement) -- Search format, NO content after

I have been free to install 64-bit Oracle 12c to Centos5.9 of 64-bit Enterprise Edition these days. Most of the information found on the internet is based on the installation documents on Centos6.x, RHEL6.x, and Oracle Linux6 systems, I seldom see

After successful oracle installation, a default password is omitted, such as the user's password validity period and locking policy ..., by default, the oracle user password is valid for 180 days. The maximum number of failed logon attempts is 10

Mysql storage engine InnoDB 1. Subject structure: Default 7 Background threads, 4 io threads (insert buffer, log, read, write), 1 master thread (highest priority), 1 lock monitoring thread, one error monitoring thread. You can view it through show

From the perspective of the recovery type, Oracle data recovery can be divided into two types: full recovery and Incomplete recovery. Actually, I am familiar with Oracle After the architecture, there will be a general concept for Oracle recovery.

After upgrading MySQL from 5.0.49 to 5.1.68, the QPS doubled; 650) this. width = 650; "src =" http://www.bkjia.com/uploads/allimg/131229/2111425108-0.png "title =" 1.png" alt = "155624252.png"/> After review the applications of all domains, the

I. basic information and concepts 1. ASM is an ORACLE automatic storage management software. It uses bare devices and ASM disks. Before using the software, you need to secure the ASM library driver for the corresponding platform. 2. ASM combines

Today, the flush tables with read lock command was used to solve Database Synchronization exceptions, so I learned about the lock table by the way. 1. FLUSH TABLES WITH READ LOCK This command is global read lock. After the command is executed, all

Job functions:Database Engineer/Administrator Job description:Job description:1. Responsible for database-related design and development and database performance optimization based on product requirements2. Works with software developers

I. IntroductionSince dba left the company, I managed all oracle database servers in part-time. I logged on to a database in a certain province today and found that I had logged on to the database about 30 seconds ago. Then I checked the load and

Application of Regular Expressions in ms SQL Server the Oracle database provides regular expressions by default. For details, see wikipedia. For example: REGEXP_LIKE (), REGEXP_INSTR (), REGEXP_SUBSTR (), REGEXP_REPLACE (), which is not directly

In the morning, I got a call from the lead in the elevator and said that the app couldn't get up. I ran up and checked the information and found that the application interface had always reported a wrong login database user and password. After

The MySQL master-slave replication structure is based on the mysql bin-log. The slave database receives the bin-log incremental information of the master database by opening the IO process and saves it to the local relay log, then, the incremental

When I tested the SQL Server 2014 memory database some time ago, I found that if the database size exceeds the configured maximum memory size, SQL Server encountered Error: 701. Error message: Error: 701, Severity: 17, State: 123. There is

In Oracle 8i, operating system commands are often run during the storage process. generally, Oracle Enterprise Manager can be used to set jobs. however, due to the lack of flexibility in the setup of OEM jobs, the set job parameters are fixed. in

1 DB2 Programming 1.1 do not use the TAB key after creating a stored procedure Create procedureYou can only use spaces, but not tab keys, otherwise the compilation will fail.Remember, remember. 1.2 use temporary tables Note that temporary tables can

A common database task archives records from one table to another. If you want to delete unnecessary records from the original table to reduce the table size, but may refer to these records in the future, you can archive records instead of deleting

When the sybase asa database is shut DOWN abnormally, it is prone to exceptions, such as table or index errors. The trouble is that the database will go DOWN when you delete a table using drop table t_name. Below are two common restoration methods:

SQL SERVER Memory will increase constantly When the SQL Server database engine is in Microsoft®Windows NT®Or Windows®2000 when running, its default memory management behavior is not to get a specific amount of memory, but to get as much memory as