How many types of pages are available in SQL Server?
SQL Server has two types of extents: Uniform extents are owned by a single object; all eight pages in the extent can only be used by the owning object. Mixed extents are shared by up to eight objects. Each of the eight pages in the extent can be owned by a different object.
What are data pages in SQL Server?
The disk space allocated to a data file is logically divided into pages which is the fundamental unit of data storage in SQL Server. A database page is an 8 KB chunk of data. When you insert any data into a SQL Server database, it saves the data to a series of 8 KB pages inside the data file.
What are the types of SQL Server?
Various Editions of SQL Server are Enterprise, Standard, Web, Developer, and Express.
How many types of pages are available?
Any website can be made up of three types of Web pages based on their location within a site: The Home page: often the first page which a visitor sees (sometimes a Welcome page precedes this). Intermediate pages: these are the pages which are “the next level down”, immediately accessible from the Home/Index page.
What are dirty pages in SQL Server?
In SQL Server, the data in table is stored in pages which has fixed size of 8 KB. … Once a page is modified in memory due to data modification (Insert/update/delete), it is called “dirty” page. On the other hand, if a page which is not modified is called “clean” page.
What is DB page size?
The default database page size in InnoDB is 16KB. By recompiling the code, you can set it to values ranging from 8KB to 64KB. Further, to put rows in relation to pages: The maximum row length, except for variable-length columns (VARBINARY, VARCHAR, BLOB and TEXT), is slightly less than half of a database page.
What is page size MySQL?
By default, all tablespaces have a page size of 16KB; you can reduce the page size to 8KB or 4KB by specifying the innodb_page_size option when you create the MySQL instance. The pages are grouped into extents of size 1MB (64 consecutive 16KB pages, or 128 8KB pages, or 256 4KB pages).
What is primary key SQL?
In SQL, a primary key is a single field or combination of fields that uniquely defines a record. None of the fields that are part of the primary key can contain a NULL value. A table can have only one primary key. You use either the CREATE TABLE statement or the ALTER TABLE statement to create a primary key in SQL.
What is data type in SQL?
A data type is an attribute that specifies the type of data that the object can hold: integer data, character data, monetary data, date and time data, binary strings, and so on. SQL Server supplies a set of system data types that define all the types of data that can be used with SQL Server.