The simplest MySql database backup method

Source: Internet
Author: User
Tags sql error

Using MYSQL for database backup is also a regular database backup method. It has the same concept as other database servers, but have you ever thought about it, mySQL will have a simpler backup method using the file directory, and it will be faster and better.

  I. Data Backup shortcuts

Because this method has not been verified in the official documentation, we call it a test.

Objective: To back up a mysql database TestA in the hostA host and restore it to the hostB host

Test environment:

Operating System: WinNT4.0, Mysql3.22.34, and phpMyAdmin 2.1.0

Install mysql database in hostA and create TestA Database

The mysql database is installed on the hostB machine, and there is no TestA Database


Start phpMyAdmin to check the database list in HostA and HostB. No TestA database exists in HostB.

Find the mysql installation directory in HostA, and find the database directory data

In my test environment, this directory is

C: mysqldata

Find the subdirectory of the corresponding database name

C: mysqldataTestA

Paste and copy the file to the Data directory of HostB, which is the same as the file in the Data directory of HostB Mysql.

Refresh the phpMyAdmin of HostB and check the database list. We can see that TestA has appeared, and the query and modification operations are normal. The Backup recovery is successful.

Test conclusion: Mysql databases can be stored in the form of files, backup, recovery as long as the corresponding file directory can be restored, no need to use other tools to back up.

 Ii. Formal method (officially recommended ):

MySQL mysqldump is used for export. The basic usage is as follows:

Mysqldump [OPTIONS] database [tables]

If you do not specify any tables, the entire database will be exported.

Run mysqldump -- help to obtain the option table supported by your mysqldump version.

Note: If you run mysqldump without the -- quick or -- opt option, mysqldump loads the entire result set to the memory before the export result. If you are exporting a large database, this may be a problem.

Mysqldump supports the following options:

-- Add-locks

Add lock tables and unlock table before each TABLE is exported. (To make it faster to insert data to MySQL ).

-- Add-drop-table

Add a drop table before each create statement.

-- Allow-keywords

Names of columns allowed to be created as keywords. This is done by adding the table name before the column name.

-C, -- complete-insert

Use the complete insert Statement (with the column name ).

-C, -- compress

If both the client and server support compression, all information is compressed between the two.

-- Delayed

Use the insert delayed command to INSERT rows.

-E, -- extended-insert

Use the new multiline INSERT syntax. (A more compact and faster insert statement is provided)

-#, -- Debug [= option_string]

Tracking Program usage (for debugging ).

-- Help

Displays a help message and exits.

-- Fields-terminated-by =...

-- Fields-enclosed-by =...

-- Fields-optionally-enclosed-by =...

-- Fields-escaped-by =...

-- Fields-terminated-by =...

These options are used with-T options and have the same meaning as the load data infile clause.

Load data infile syntax.

-F, -- flush-logs

Wash Out the log files on the MySQL server before starting the export.

-F, -- force,

Even if we get an SQL error while exporting a table, continue.

-H, -- host = ..

Export data from the MySQL server on the named host. The default host is localhost.

-L, -- lock-tables.

Lock all tables for start export.

-T, -- no-create-info

Create table statement)

-D, -- no-data

No row information is written to the table. If you only want to export the structure of a table, this is very useful!

-- Opt

Same as -- quick -- add-drop-table -- add-locks -- extended-insert -- lock-tables.

You should be given the fastest export possible for reading a MySQL server.

-Pyour_pass, -- password [= your_pass]

The password used to connect to the server. If you do not specify "= your_pass", mysqldump requires a password from the terminal.

-P port_num, -- port = port_num

The TCP/IP Port used to connect to a host. (This is used to connect to a host other than localhost because it uses Unix sockets .)

-Q, -- quick

Directly export the data to stdout without buffering the query; Use mysql_use_result () to do it.

-S/path/to/socket, -- socket =/path/to/socket

The socket file used when connecting to localhost (which is the default host.

-T, -- tab = path-to-some-directory

For each given table, CREATE a table_name. SQL file that contains the SQL CREATE command and a table_name.txt file that contains data. Note: This only works when mysqldump runs on the same machine where the mysqld daemon is running .. The format of the txt file is determined by the options -- fields-xxx and -- lines -- xxx.

-U user_name, -- user = user_name

The username used by MySQL to connect to the server. The default value is your Unix login name.

-O var = option, -- set-variable var = option

Set the value of a variable. Possible variables are listed below.

-V, -- verbose

Lengthy mode. Print out more information about the program.

-V, -- version

Print the version information and exit.

-W, -- where = 'where-condition'

Only selected records are exported. Note that the quotation marks are mandatory!

"-- Where = user = 'jimf '"-wuserid> 1 ""-wuserid <1"

The most common use of mysqldump may make a backup of the entire database:

Mysqldump -- opt database> backup-file. SQL

However, it is also useful for enriching another MySQL database with information from one database:

Mysqldump -- opt database | mysql -- host = remote-host-C database

Mysqldump exports complete SQL statements, so it is easy to import data into mysql client programs:

Mysqladmin create target_db_name

Mysql target_db_name <backup-file. SQL

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