MySQL index details, MySQL index detailsI. Introduction to index basics 1.1
In MySQL, indexes are also called keys. They are a data structure that the storage engine uses to quickly find records.
Indexes are critical to good performance. Especially
IndexYou can use indexes to quickly access specific information in database tables. An index is a structure that sorts the values of one or more columns in a database table (for example, the last name (lname) column of the employee
In the database, the index is a special object, it is a database structure that can speed up the data retrieval, it can quickly find the necessary content from the large amount of data, make the data query without retrieving the whole database. An
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Creates an index for a given table or view.Only the owner of a table or view can create an index for the table. The owner of a
SYS. dm_exec_requests is a powerful tool to check the performance bottleneck of SQL Server.
Update statistics t_goods with fullscan --- Update table statisticsThe index leaves of clustered indexes are the data itself.The leaf node of the
Creating an index is the establishment of an index on one or more columns of a table to increase the speed of access to the table. There are 3 ways to create an index, the 3 ways to create an index when creating a table, to create an index on a
This article mainly originates from the Internet mainstream article, just according to the individual understanding slightly makes the integration, behind has the reference link. I. Summary
This paper takes the MySQL database as the research object
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