Database Administrator

Apache originated from the NCSAhttpd server and has been modified many times to become one of the most popular Web server software in the world. Apache is taken from the pronunciation of "a patchy server", which means a server full of patches,

An earlier version of mysql server has been installed on the Linux server in use. When the rpm package is used for installation, a version conflict is prompted and the installation cannot proceed. The solution is as follows: 1. First, find all the

In the latest project, you need to convert the utf8-encoded MySQL database to utf8 (in the past, gb2312 to utf8) The method is as follows:Step 1:Run:./mysqldump-uroot-p -- default-character-set = utf8 -- extended-insert = false dbname> DBNAME_GB2312

This article describes the simple principle of ODBC and how to install, configure, and program ODBC in Linux/Unix. I. ODBC principles ODBC is the abbreviation of Open Database Connect, which is a unified interface standard proposed by Microsoft in 19

Introduction The Flashback database is a point-in-time (PIT) database restoration method. This Incomplete recovery policy can be used to restore a database that is logically damaged due to human errors. After being introduced in 10 Gbit/s, it is

It can call windows sql2000 database in php of Debian Ubuntu System System Installation SoftwareApt-get install php5-sybase/Etc/init. d/apache2 restart PHP code writing$ Msconnect = mssql_connect ("server", "User Name", "password ");$ Msdb = mssql_

The installation and configuration of Oracle 11g R2 Grid Infrastructure provides more flexibility than the previous version. If you run root. sh before installing Grid Infrastructure, errors often occur and you need to fix the errors to continue. In

I. Question 1 The following error is found in the alert log for RAC standby: SUCCESS: diskgroup DATA was mounted ERROR: failed toestablish dependency between database dave_st and diskgroup resourceora. DATA. dg SUCCESS: diskgroup FRA was

Mysqlslap can be used to simulate server loads and output timing information. It is included in the MySQL 5.1 release package. During testing, you can specify the number of concurrent connections and SQL statements. If no SQL statement is specified,

In project development, you always need to view the SQL statements executed in the background, and mysql database is no exception. Generally, you prefer to use showprocesslist, the types of SQL statements that can be analyzed and executed in the

Creating a table in Oracle focuses on the table field type and corresponding constraints. 1. Create a table statement Create table tname ( Fied1 Type 1, Fied1 type 2, ........ ); Create table tname as subquery -- copy existing tables 2. Field

Buffer Pool Flush Listadd page to flush list The page in the buffer pool has three states: Free: the current page is not used. Clean: the current page is used. It corresponds to a page in the data file, but the page is not modified. Dirty: the

• Describes various conversion functions provided by SQL • TO_CHAR, TO_NUMBER, and TO_DATE conversion functions • Apply conditional expressions to SELECT statements Implicit and explicit data type conversion TO_CHAR, TO_DATE, and TO_NUMBER

MySQL master-slave replication is widely used in small ZTE enterprises. There are three key points for configuring MySQL master-slave replication. 1. server-id. The master server-id is smaller than the slave server-id2. Create an account that can be

Regular Functions The following functions are applicable to any data type and use null values: • NVL (expr1, expr2) • NVL2 (expr1, expr2, expr3) • NULLIF (expr1, expr2) • COALESCE (expr1, expr2 ,..., exprn) the following functions are applicable to

1. Test preparation1. Back up the master databaseDump database master to '/backup/master. dat' 2 lv_masrter size # Lsvg-l datavgDatavg:Lv name type LPs PPs PVs LV STATE MOUNT POINTLv_backup jfs2 320 320 1 open/syncd/backupLoglv00 jfs2log 1 1 1

Abstract: rhel5.8, mysql, keepalived, and haproxy are used to build a cluster with high availability and load balancing. mysql binary replication is also used to maintain data consistency. Single Node failure is avoided, it also provides device

Even if relational databases are still very useful tools, their monopoly status for decades is coming to the fore. There are already countless NoSQL databases that can shake the status of relational databases. Of course, these NoSQL cannot

I have written an article about the performance problems caused by filter, which is written at the beginning: The word "filter" is confusing. a subnode, two subnodes, and three subnodes can be mounted at the next level .... Apply a subnode to filter

Introduction to Capped CollectionCapped Collection is a special Collection with a fixed size. When the Collection size reaches the specified size, new data overwrites old data. Capped collections can be saved to the collection according to the