Learn MySql at AMC Square Learning

What Is MySQL?

• A fast, reliable, easy-to-use, multi-user multi-threaded relational database system.• It is freely available and released under GPL (GNU General Public

License ).

Why Use MySQL ?

• MySQL server can handle very large databases.• Offers rich and very useful set of functions.• Connectivity, speed and security make MySQL very suited for

accessing database on a network.• A lot of contributed software available.

What Does MySQL Offer ?

•A privilege and password system that is very flexible and secure and allows host-based verification.•Multi-threaded request-handling using kernel

thread.•Replication features.•Very actively developed.•Memory leak proof.

Types of table in MySql

• Creates a .frm file that holds the table and column definition.

• Syntax for defining table type is .. CREATE TABLE test ( )

TYPE=HEAP ..

• Categorization of types : Transaction safe type and Non transaction safe

type.

• Transaction Safe table types allow rollbacks, restore changes if update fails ,etc. .

• Non Transaction Safe table types are much faster ,use less disk space as well as memory for updates.

Merging the tables

• A collection of identical My example tables which are used collectively.

• FOR ex. :

CREATE TABLE t1 (a INT AUTO_INCREMENT PRIMARY KEY, message CHAR(20));

CREATE TABLE t2 (a INT AUTO_INCREMENT PRIMARY KEY, message CHAR(20)) ;

CREATE TABLE total (a INT NOT NULL, message CHAR(20), KEY(a)) TYPE=MERGE UNION=(t1,t2)

select ,insert and Operations update .are allowed

How To SLAVE

•Upgrade both slave and master to 3.23.15 or higher. •PUT THESE IN my.cnf of SLAVE•master-host,user,passwd •server-id=< unique no>= 1 & <=2^32-1•master-connect-retry !! (keep trying)• master-info-file•replicate-rewrite-db•skip-slave-start•Restart the slave(s)

How To SLAVE cont.…

•Take a snapshot of all the tables/databases on the master •Use command LOAD TABLE <tblname> FROM MASTER

(3.23.23)+• SLAVE START/STOP • FLUSH SLAVE

HOW TO MASTER

• log-bin , FLUSH MASTER , FLUSH SLAVE•When you start the slave thread will be created• Tables are not Locked • SET SQL_LOG_BIN=0/1• CHANGE MASTER TO master_def_list

Thank you