InnoDB Logical Storage

Source: Internet
Author: User

InnodbLogical Storage

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Segment: Data segment, rollback segment ...

Extent: A extent page , a large segment can apply for 4 extent

Page: A page 16k, a extent16*64=1024k=1m

Segment: like Oracle , in a way, a segment can be understood as a table

Bufferand thePageRelationship
    1. Buffer interacts data from the data file into memory in page (conservative attitude);

    2. MySQL is also divided into physical reading and logical reading, similar to Oracle ;

    3. Page interacts in memory, a page corresponds to a buffer,[ Note in the terminology ];

    4. Buffer divided into free[ never used ],clean[ and data files in consistency ],dirty[ Inconsistent with data in data file ]

Memory Chain Management
    1. Freelist corresponds to free buffer;

    2. Flushlist corresponds to dirty buffer, need to be refreshed;

    3. Lrulist corresponds to Cleanbuffer, pay attention to hit ratio;

    4. List linked list, which can be used from the back to the rear.

This article is from the "90SirDB" blog, be sure to keep this source

InnoDB Logical Storage

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