authority management:
use mysql
Add users, the users of these ip specified user name and password to access through
create user 'username' @ "ip" identified 'password' where, ip can use to specify the number of fuzzy address
Delete User drop user 'username' @ "ip"
Authorization grant select, insert, uqdate on library name table name to 'username' @ "ip".;
Puncturing the right to revoke all on the library name table name from 'username' @ "ip";
After modifying permissions, we need to flush privileges; to refresh
Modify User rename user 'username' @ 'ip address' to 'new user name' @ 'new ip address'
Change password set password for 'username' @ 'ip address' = ( 'new password');
database backup:
Backup Database: mysqudump -h ip ... -p 3306 -u ... -p ... library name> is the file path at this time to get all the statements to create the database, known as logical backup
Restore the database: create a library of the same name to be restored, then mysqudump -h ip ... -p 3306 -u ... -p ... library name <file path that can change the direction of the arrow
Not created, then added before the backup repository name a '-B', when the recovery does not need to build, do not add the library name
Points table, divided backup: shell circulating library name or table name
Incremental backup: realized by bin-log log. Primary library operations, and an incremental backup copy to the database from a backup master; separate read and write, the write data is written to the primary database, the read data is only read from the library.
Data availability:
After the primary database downtime, automatically open from the library, and receiving online content corresponding to the program
While monitoring the operation of two libraries
Cluster:
Done modulo data packet processing, the remainder is allocated according to different servers. This group becomes a cluster architecture.
view:
trying to create view name as select * from course;
Generating a virtual library of the same content data, the data can be combined with a plurality of tables, to avoid the need to repeat multiple operations.
Modifying views joint may have a plurality of tables produced complex effects, and inefficient. Not recommended for use.
trigger:
During certain operating sql statement so that it can automatically trigger some action.
Creating triggers:
It must first declare statement terminator, after the change back ''; ''
delimiter // # Here is the change at the end, into a symbol of what can be
create tigger cmd_tri after insert on cmd for each row//
begin
if new. field = 'no' then
insert into table (field 1, field name 2) values (. new field 1, field 2 new new.);
end if；
end//
delimiter; # here is the terminator back to the original;
It can trigger a series of operations by recording the error status, the error term saving time and error log form
Delete triggers:
drop tigger trigger name;
Transaction:
Multiple sql statements bundled together to perform, conduct an atomic operation, all of the implementation can take effect, there is an error on all rolled back.
Transaction Start;
Update User SET Balance = 900 WHERE name = 'WSB'; pay to buy # 100 yuan
update user set balance = 1010 where name = 'chao'; # mediation took 10 yuan
uppdate user set balance = 1090 where name = ' ysb '; # seller was 90, did not get the abnormal operation
rollback; # If the above three sql statement appeared abnormal, directly ROLLBACK, the data directly back to the original state.
commit; # just not commit, the data is not saved on the hard disk. After performing commit no way a rollback.
Stored Procedures:
In the process of writing high storage complex sql statement, on the service side, when developers use related functions can be called, efficiency
Create a stored procedure (no-argument):
delimiter //
create PROCEDURE p5()
BEGIN
sql语句；
END //
delimiter ;
After execution, the use of call p1 (), once inside the sql statement will be executed.
Delete stored procedure:
drop produre stored procedure name;
Create a stored procedure (there are parameters):
Three kinds of inputted parameters, output parameters have, both input and output parameters
Input parameters:
p2（
in the parameter name
）