sql server performance tuning best practices

for a field in a table, a nonclustered index for that field can be an unexpected effect. Because the database system searches for data values, it searches for a nonclustered index, finds the location of the data value in the table, and then retrieves the data directly from that location. Because the index contains entries that describe the exact location of the data values that the query searches for in the table, this is why nonclustered indexes are the best way to precisely match queries. For

SELECT TOP 1000O.name as table name, I.name as index name, i.index_id as index ID, dm_ius.user_seeks as Search times, Dm_ius.user_scans as Scan count, dm_ius.user_lookups as lookup times, dm_ius.user_updates as update number, p.tablerows as table row count, ' DROP INDEX ' + QUOTENAME (i.name)+ ' on ' + QUOTENAME (s.name) + '. ' + QUOTENAME (object_name (Dm_ius. object_id)) as ' DELETE statement 'From Sys.dm_db_index_usage_stats Dm_iusINNER JOIN sys.indexes i on i.index_id = dm_ius.index_id and D

1> Computer HardwareIf you suspect that computer hardware is the main cause of affecting SQL server performance, you can monitor the load of the corresponding hardware through SQL server performance monitor to confirm your guesses

Label:Original: SQL Server 2008 Performance Troubleshooting (i)--IntroductionRemark: I spent a lot of work time translation, no plagiarism, allow reprint, but please indicate the source. Because of the length, not a post all finished, but also not so fast all translated, so according to the chapter published. Due to my limited level, translation results must be p

performance of the two-range query with YY_BH Index is certainly greatly improved.9. Appropriate and inappropriate in the query conditionsQuery parameters can include actions: =, Inappropriate query parameters are: not,! =, 10. Use Delete sparinglyIn general, some of the logic of deleting data will be implemented more or less in stored procedures. For a small number of tables, the problem is not very big. But for large data tables, deleting data with

1. Select the most efficient table name order (valid only in the Rule-based optimizer) The SQL Server parser processes the table names in the FROM clause in Right-to-left order, therefore, the last table in the FROM clause (driving table) is processed first, and in the case where multiple tables are included in the FROM clause, the table with the fewest number of records must be selected as the underlying

SQL Server CPU performance check and optimization related SQL statements, very good SQL statements, recorded here: -- Begin SQL related to CPU Analysis and Optimization -- use DMV to analyze statements that have used the most CPU

Comparison of paging stored procedures and performance of five types of SQL Server, SQL stored procedures In SQL Server database operations, we often use stored procedures to implement paging processing of the queried data to faci

It's been a long time since you've written, and DBAs typically have to test server performance before the system is officially online. For example, you have a lot of servers, some do Web server, some do cache server, some do file server, some do database

the same as 2). You can specify more configurations. 3. sp_configure/reconfigure Displays or changes the global configuration settings of the current server. Many configurations need to be set through sp_configure. Syntax: sp_configure[[@configname=]'option_name' [,[@configvalue=]'value']] reconfigure For example: To configure advanced options with sp_configure, you must first run sp_configure when the "show advanced options" option is s

Some factors that affect the performance of SQL Server databases and the principle of optimizing the performance of SQL Server, and some guiding principles are proposed to optimize the perform