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Query OptimizerThere are rules in each field. In the simplest way, if you do not conform to the C # specification for programming, such as incorrect keyword usage, an error will be reported during compilation. Of course, there are some hidden rules in each field, and some people may say that they are "hidden rules". These rules are often not clear. For example, if you do not conform to the best practices to write a program, compilation will not report an error, but the
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
personally think that if most of the requests reach the second paradigm, the system will generate fewer columns and more tables, this reduces data redundancy and improves performance. 2, Reasonable redundancy It is almost impossible to design a system completely according to the standardization. Unless the system is very small, it is necessary to add redundancy in a planned manner after the standardization design. Redundancy can be a redundant databa
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
smallertable (Lookupcolumn) Look at the query execution plan for both At this point we see the above query execution plan, we can clearly see the left JOIN .... Is null or full JOIN then after filtering, just after creating the index performance improved a little, but unlike the left JOIN ... Is null for not exists the planned execution is different from not creating an index, at this point the flow aggregation is used first and then the right half
Label:Currently in a project optimization, want to analyze SQL Server system performance through the database layer, check the online code, modify the title and DMVs code, the following code can be used to analyze the system after a period of time, those statements are system busy SQL statement. As a reference. Alterna
Tags: performance optimization for SQL Server administrator-required skillsPerformance optimizations for SQL Server administrator-required skillsSQL Server is one of the essential services of the enterprise, so it is a great chall
Recently due to work needs, I hope that a more comprehensive summary of SQL Server database performance optimization related considerations, search on the internet, found a lot of articles, and some are listed hundreds, but look at the discovery, there are many specious or outdated (may be on the SQL SERVER6.5 the prev
Label:To test SQL performance:One, by setting statistics to view the system situation when executing SQL. Options: Profile, O, time.SET STATISTICS profile on: Displays the time, in milliseconds, that is required to parse, compile, and execute the query.SET STATISTICS IO on: Reports information about the number of scans per table referenced in the statement, the number of logical reads (pages accessed in the
During project optimization, I want to analyze SQL server system performance through the database layer. I checked the online code and modified the title and dmvs code, the following code analyzes the SQL statements that are busy after the system runs for a period of time. For reference. Alternative use: When analyzin
At present, I want to analyze the SQL server system performance through the database layer during project optimization.Code, Changed the title and dmvs code. The following code can be used to analyze the SQL statements that are busy in the system after the system runs for a period of time. For reference. Alternative
'the value of the Key5' fromheadertable awhereA.headerid= 10000 SELECTA.*, t.a0001 as 'the value of the Key1', t.a0002 as 'the value of the Key2', t.a0003 as 'the value of the Key3', t.a0004 as 'the value of the Key4', t.a0005 as 'the value of the Key5' fromHeadertable AInner Join (SelectHeaderid, Detailkey, detailvalues fromdetailtable) T Pivot (MAX(detailvalues) forDetailkeyinch(a0001,a0002,a0003,a0004,a0005)) T onT.headerid=A.headeridwhereA.headerid= 10000
. Saves all sorts of Shenma sorting de-duplication... stream aggregation de-duplication... and so on.It seems that the AND connector is a very handsome operator... so many times we try to write OR, it is better to switch to AND more efficiently.ReferencesLogical operators and physical operators in Microsoft books onlineReference books: SQL. Server.2005. technical insider seriesConclusionThis article mainly
Designing an application system does not seem difficult, but it is not easy to optimize the system performance. There are multiple options in terms of development tools, database design, application structure, query design, and interface selection, depending on the specific application requirements and the skills of the development team. This article takes SQL Server
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