Questions tagged [data-pages]

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How is page data rearranged after clustered index is created?

Can anyone please explain what happens at the page level when clustered indexes are created? How do pages rearrange data once clustered indexes are created?
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Which columns are off-paged (ROW_FORMAT=DYNAMIC)?

When going through the MySQL 5.7 manual, I found some contradictory facts. Fact 1: When a table is created with ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED, InnoDB can store long variable-length ...
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Is the idea of 'pages' and 'extents' unique to SQL Server or shared by other database management systems?

I know that a database management system like MySQL can make use of multiple storage engines - i.e. InnoDB, MyISAM, etc. And reading into how SQL Server stores data (Understanding Pages and Extents), ...
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Extreme high index fragmentation in MS SQL Server

I have a problem with CLUSTERED INDEX, every one of my table have extemely high total fragmentation, around 92% with having page fullness in the same time at around 99%. So in my understanding pages ...
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165 views

Page Header DB Frag ID Property

I am using SQL Server version: Microsoft SQL Server 2012 - 11.0.2100.60 (X64). I created a single table containing one and only one integer-valued column. I then added one and only one row to the ...
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1answer
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Least recently used replacement strategy - where is pin count stored?

I am reading a book on databases and a chapter in it talks about buffer manager and it's replacement strategies. The two popular replacement startegies mentioned are least recently used - LRU and ...
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1answer
54 views

How does DYNAMIC Row format handle NULL storage MYSQL 5.7?

As a newbie to Mysql I just can't understand how NULL values are stored in each row formats. As per docs(last bullet-in), NULLs for fixed length columns (BIGINTs) also take their data space reserved. ...