sql performance tuning techniques

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[GO] SQL performance Tuning daily accumulation

be sorted, or it can be added to a column (like joins or additions). Any non-indexed item in the ORDER BY statement, or a computed expression, will slow down the query. Double-check the order BY statement to find non-indexed items or expressions that degrade performance. The solution to this problem is to rewrite the order BY statement to use the index, or you can establish another index for the column you are using, and you should absolutely avoid u

Optimizing SQL for Performance tuning

union and UnionAll. UnionAll Good 18, pay attention to using distinct, do not use when not necessary, it will make the query slower than the union. Duplicate records are not a problem in the query. 19. Do not return rows or columns that are not required when querying 20. Use sp_configure ' query governor cost limit ' or setquery_governor_cost_limit to limit the resources consumed by the query. When an estimate query consumes more resources than the limit, the server automatically cancels the qu

Performance Tuning article-TPS low-optimized SQL statement (i)

index, the TPS from the previous 110 to 6000 such. Two. The SQL statement index does not work: When performing a performance test, the server is running under the circumstances: The CPU of the database is up to 90%-99.9%, and the CPU of the application is low; Sufficient memory (free memory >20m); Network normal; Disk input/output is normal; CPU-High Monitor diagram The logs a

SQL Server Column Storage performance tuning (translation)

Label:Original address: Http://social.technet.microsoft.com/wiki/contents/articles/4995.sql-server-columnstore-performance-tuning.aspxSQL Server's Columnstore index is a new version of SQL Server release that improves query performance for the Data Warehouse, and this article explains the

SQL Server database Performance tuning tips

an execution plan, and stored in a database of SQL statements, is a collection of control flow language, the speed of course fast. 48, the return value of the function is not too large, this overhead is very large. A user-defined function that executes as a cursor consumes a large amount of resources if a large result is returned with a stored procedure. 49, as far as possible to avoid repeated access to the same or several tables, especially the lar

SQL Server Performance Tuning resource Waits pageiolatch_x

released, the data page will not be in the memory of the data cache, This causes the memory problem to be the bottleneck of the disk. PAGEIOLATCH_EX is write data, this is generally the disk write speed obviously keep up, and memory is not directly related. Here is the resource wait time for query pageiolatch_x: Select Wait_type, waiting_tasks_count, Wait_time_ms, Max_wait_time_ms, Signal_wait_time_ms from sys.dm_os_wait_stats wherelike' pageiolatch%' order by Wait_type Through the above

SQL Server performance Tuning common methods

1. Check the database space usage to see which tables are consuming larger disk spaceExecute the following statement:SelectO.name, SUM (p.reserved_page_count) asReserved_page_count, SUM (p.used_page_count) asUsed_page_count, SUM ( CaseWhen (p.index_id2) Then (p.in_row_data_page_count+P.lob_used_page_count+p.row_overflow_used_page_count)Elsep.lob_used_page_count+P.row_overflow_used_page_count End) asDataPages, SUM ( CaseWhen (p.index_id2) then Row_countElse 0end) asrowcounts fromsys.dm_db_partiti

Some of the types of lock Wait that can be consulted in SQL performance tuning

DISTINCTdatabase_id,object_idFrom Sys.dm_db_missing_index_details) as Ddmid on ddmid.database_id = ddios.database_idand ddmid.object_id = ddios.object_idWHERE Ddios.page_lock_wait_in_ms > 0 and object_name (ddios.[ OBJECT_ID]) like ' Pos_transmst 'ORDER by Ddios.page_lock_wait_count DESC;/*******************************************************************************************--page IO Latch Wait *******************************************************************************************/ SEL

SQL Basic Series (4)-Performance tuning recommendations

not in with not existsIn a subquery, the NOT IN clause performs an internal sort and merge, in either case, not in is the least effective because it performs a full table traversal of the table in the subquery, and in order to avoid using not, it can be written as an outer join (Outer Joins) or not EXISTSLow efficiencySELECT *FROM dbo. OrdersWHERE id_p>0 and Id_p not in (SELECT IdFROM dbo. Persons)EfficientSELECT *From OrdersWHERE id_p >0 and not EXISTS (SELECT IdFrom Persons WHERE persons.id =

Performance tuning tools for SQL Server 2005

, one is not perfect function also dare to take Out (2000) The second functional architecture of the outstanding design makes the function has a strong continuity and Scalability (2005 2000 of the function to retain and improve). The optimization tool is simple to use 1: Use SQL Server Porfiler (Event Viewer) to record all the steps of the operation database in the business system and save it as a working file. 2: Open sql2005 's database Engine

SQL Performance Improvement Techniques

Original address: Http://www.codeproject.com/Tips/1023621/SQL-Performance-Improvement-Techniques This article provides various options to improve the performance in database. 1) Re-write Query:If Any, the is taking much time-to-execute then the first step was to rewrite the query. Perform thorough analysis and move tow

Summary of Oracle SQL performance optimization techniques

requires a sort operation, while the others need to perform at least two sorting. Typically, SQL statements with union, minus, and intersect can be overridden in other ways. If your database is well-sort_area_size, using union, minus, intersect can also be considered, but they are very readable.(34) Optimize GROUP by: Increase the efficiency of the group BY statement by filtering out unwanted records before group by. The following two queries return

Uncover SQL optimization techniques to improve database performance _mysql

possible join The advantage of MySQL is simplicity, but in some ways it is a disadvantage. The MySQL optimizer is highly efficient, but because of its limited statistics, the optimizer's work process is more likely to deviate. For complex multiple table joins, on the one hand because of its optimizer limited, and also in the Join this aspect of the effort is not enough, so performance from Oracle and other relational database predecessors still have

Performance Tuning Strategy

daily data calculation is only 20 minutes, but if I want to count the whole month, The system takes more than 10 hours (SQL statements degrade performance in the presence of large data volumes). This divide-and-conquer approach helps performance in the face of big data, just like the merge sort. Performance optimizati

I will share 11 practical tips on Java performance tuning and java Tuning

I will share 11 practical tips on Java performance tuning and java Tuning Most developers think that performance optimization is a complicated problem and requires a lot of experience and knowledge. Yes, it is not wrong. It is not easy to optimize the application to achieve the best

Oracle Performance Tuning __oracle

Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It has a large number of tuning parameters and techniques to improv

A formal performance tuning method--based on the waiting tuning

then translated into HTML, XML, WML, or any other format required by any client. Modern applications contain more moving parts and "black boxes" than in the past, which presents a huge challenge to performance tuning. In addition to increased complexity, performance tuning techni

Java Program Performance Optimization-Performance tuning hierarchy

the system. If the design layer is poorly considered, leaving too many hidden problems, then these "quality" problems, may not be able to pass the code layer optimization to compensate. Therefore, developers must carefully consider the performance of software systems at the beginning of software design.Design optimization, designers must be familiar with the common software design methods, design patterns, basic

Linux server performance tuning skills, linux Server Tuning

Linux server performance tuning skills, linux Server TuningPerformance tuning skills for 20 Linux servers Guide Linux is an open-source operating system that supports various hardware platforms. Linux servers are world-renowned. The main difference between Linux and Windows is that, by default, a Linux server does not provide a GUI (graphical user int

Spark Performance Tuning Guide-Basics

ObjectiveIn the field of big data computing, Spark has become one of the increasingly popular and increasingly popular computing platforms. Spark's capabilities include offline batch processing in big data, SQL class processing, streaming/real-time computing, machine learning, graph computing, and many different types of computing operations, with a wide range of applications and prospects. In the mass reviews, many students have tried to use spark in

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