This article is transferred from:
Http://www.cnblogs.com/abcdwxc/archive/2007/12/11/990274.html
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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
0. ReferencesTable Scan, Index Scan, index SeekSQL Server–index Seek vs. Index Scan–diffefence and Usage–a simple NoteHow Oracle tables are accessedDifference between index seek and index scan and where applicableHow to access tables in 1.oracleIn
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
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
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
The main considerations for designing SQL Server indexes are as follows:Check where condition and join condition column;Use narrow index;Check the selectivity of the column;Check the data type of the column;Consider the order of the columns;Consider
ReprintedBytes
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
The main considerations for designing SQL Server indexes are as follows:Check where condition and join condition column;Use narrow index;Check the selectivity of the column;Check the data type of the column;Consider the order of the columns;Consider
The main considerations for designing SQL Server indexes are as follows:Check where condition and join condition column;Use narrow index;Check the selectivity of the column;Check the data type of the column;Consider the order of the columns;Consider
If we want to optimize the database, we can use the following five methods to optimize the database system:
If we want to optimize the database, we can use the following five methods to optimize the database system:
1.1.1 Summary
If we want to
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