sql server performance tuning books

SQL Server Performance Tuning 3 Index MaintenancePreface The previous article introduced how to improve database query performance by creating indexes, which is just the beginning. If you do not need proper maintenance in the future, the indexes you have previously created m

Preface Indexes are one of the most important objects in relational databases. They can significantly reduce disk I/O and logical read consumption and improve the query performance of SELECT statements. However, it is a double-edged sword. Improper use affects performance: it requires additional space to store the index information and requires additional overhead to maintain index synchronization when data

Tags: instance default help input extern data package MSDN One fixOriginal: SQL Server performance Tuning resource waiting network I/OI. OverviewThe main wait for network I/O is async_network_io, when SQL Server returns a data res

poorly run applications outweigh the investment in human, program, and technology using reliable load testing methods. Therefore, I would like to provide the following list of load tests for your application, which will be a magic bullet to prevent your SQL Server performance tuning problem. Checklist: Load test--

);} /// ///generate time information from the GUID returned by SQL SERVER/// /// comb that contain time information/// Time Public Staticdatetime getdatefromcomb (System.Guid Guid) {datetime basedate=NewDateTime (1900,1,1); byte[] Daysarray =New byte[4]; byte[] Msecsarray =New byte[4]; byte[] Guidarray =GUID. Tobytearray (); //Copy The date parts of the GUID to the respective byte arrays.Array.copy (Gu

There should be different filegroups in the database before the partition table is created;Assuming the database name is Df17datapro, create the user table UserID, put the first 500,000 data in the primary filegroup, place the 50~100 in the FG1 filegroup, and put more than 100 in the FG2 filegroup1. Add File group Fg1,fg2ALTER DATABASE Df17datapro ADD FILEGROUP FG1ALTER DATABASE df17dataproadd FILEGROUP fg22. Adding files to a filegroupALTER TABLEDf17dataproADD FILE(NAME=Df17datapro1,filename=

, generally believed that the closer the data from the method efficiency higher. With a careful use of cascading deletes and cascading updates, cascading deletes and cascading updates as new features of SQL SERVER 2000, are reserved in 2005 and should be available. I'm talking about caution here, because cascading deletions and cascading updates have broken through the traditional definition of foreign keys

Three Join strategies in the execution planThere are three join strategies for SQL Server: Hash join,merge join,nested Loop join.hash Join: Used to handle data that is not ordered/not indexed, it creates a hash table in memory of the data (the associated key) on both sides of the Join. For example, with the following query statement, the associated two tables are not indexed, and the execution plan is displ

Transferred from: http://www.cnblogs.com/MR_ke/archive/2010/08/25/1807856.htmlSQL 2005 Performance TuningSQL Server runs for a period of time, and as data accumulates, SQL runs less efficiently, and in order to use business system normal actions, IT departments often need to spend a high price on SQL

SQL Server Performance Tuning entry (graphic version) Step 1: capture sample data during business peaks(About 2 hours ). The tool used is the profiler that comes with sqlserver, also known as the event probe. For example, after entering, click the button on the leftmost side to create a new trail: DBO permission is req

/1000 N ' Total time spent in MS ',total_worker_time/1000 N ' Total CPU time MS ',Total_physical_reads N ' Total number of physical reads ',Total_logical_reads/execution_count N ' Each logical read ',Total_logical_reads N ' Logical reads total number of times ',Total number of total_logical_writes N ' logical writes ',Execution_count N ' execution times ',Creation_time N ' statement compilation Time ',Last_execution_time N ' Last Execution time ',SUBSTRING (St.text, (QS.STATEMENT_START_OFFSET/2)

Microsoft, 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

Recently, the following project encountered an urgent problem, my old horse and young people to fight together. The problem is that many queries are incredibly slow when the pressure data is poured into the database. Said there must be some basic guidelines for performance issues. The order of performance problems tunning 1 Architecture design (software architecture and database design, poor design is alm

ObjectiveAn index is one of the most important objects in a relational database and can significantly reduce the consumption of disk I/O and logical reads to improve the lookup performance of a SELECT statement. But it is a double-edged sword, and improper use can affect performance: He needs extra controls to hold the index information, and when the data is updated, it takes some extra overhead to keep the

existing event classes are displayed on the right. For performance optimization, we do not need security review or session information. Click the delete button: Switch to the third tab page, and the data column here is enough by default. Of course, if you are not pleasing to the eye, you can delete the appname/NT username and so on. On the last tab page, we need to block the event ID generated by the system: Check the excluded System ID, for examp

In our OLAP implementation, SQL is extremely complex and uses a lot of temporary tables. During the installation of tempdb, the local disk path for SQL Server installation is selected by default, and no disk array is used. When learning PostgreSQL, we found that many experts suggest placing the temporary tablespace on SSD or using RAID0 + 1 to increase the write

rows reserved data index_size unused TB_WCB 9439661 317208 kb 167168 KB 149872 KB 168 KB */ we found that the size before index compression was 329M. And after compression is 149M, the compression ratio is 45%. The effect is also very obvious. Summarize: Compression through tables and indexes. We can reduce the disk space occupied by the table, this is only part of it, and more importantly, reading the same amount of data, just need to read less data pages,

compression is 167M, the size of the table after compression is only 40% of the original table, the effect is obvious, and because most of the table's fields are only IDs, the relative repetition value is not too much.However, we see that the size of the index varies substantially, so we continue to compress the index:5. Compression indexAlter index idx_tb_wcb_id on Tb_wcbrebuildwith (Data_compression=row)6, the comparison after the index compressionsp_spaceused ' ms_visit_qst_opt '/*name

. Because the latter will not generate a large number of locked table scans or index scans.If you want to check whether a record exists in the table, do not use count (*) as inefficient and waste server resources. It can be replaced by exists. For example:If (select count (*) from table_name where column_name = 'xxx ')Can be written:If exists (select * From table_name where column_name = 'xxx ') You often need to write a t_

The failure effect is described above. Just want to explain that in the performance tunning aspect can only according to the situation to seek the reason and solves. This is an interesting process. Great principles are experiences that help us make fewer mistakes. Therefore, poor design inevitably leads to performance problems. Inexperienced programmers are bound to write bad code. But a good design can mak