Test MySQL MERGE table

Source: Internet
Author: User

A merge table is created, which is suitable for storing logs.

 

Write down a creation process

Create Table 'test _ '(
'Id' int (11) not null default '0 ',
Primary Key ('id ')
) Engine = MyISAM default charset = Latin1;

Create Table 'test _ B '(
'Id' int (11) not null default '0 ',
Primary Key ('id ')
) Engine = MyISAM default charset = Latin1;

Create Table 'test _ C '(
'Id' int (11) not null default '0 ',
Primary Key ('id ')
) Engine = MyISAM default charset = Latin1;

 

Three sub-tables, and then create a summary table

Create Table 'test '(
'Id' int (11) not null default '0 ',
Primary Key ('id ')
) Engine = MyISAM type = merge Union = (test_a, test_ B, test_c) default charset = Latin1;

 

A query of a summary table is equivalent to a query of a table Shard, but the summary table does not store data. Therefore, you cannot insert a summary table.

 

 

 

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