sql server performance tuning books

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

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

become a problem, it is necessary to first understand what sleep_bpool_flush this waiting state is. In Microsoft's official note: https://technet.microsoft.com/zh-cn/library/ms179984 (v=sql.105). aspx, with a simple description: When checkpoints abort new I/O to prevent disk subsystem flooding Appears at the time of publication. Obviously, this explanation is inadequate. So I turned over the foreign Daniel Blog and other

SQL Server performance optimization -- wait -- SLEEP_BPROOL_FLUSHPreface: There is a database for historical archiving (referred to as the historical database). After a certain amount of time, the data file has reached more than 700 GB, and it was decided that some data does not need to be retained, this part of data is truncate and more than 600 GB of space is a

/50455543Introduction: Since this has become a problem, it is necessary to first understand the waiting status of SLEEP_BPOOL_FLUSH. In Microsoft official note: https://technet.microsoft.com/zh-cn/library/ms179984 (v = SQL .105). aspx, only a simple description: when a checkpoint suspends a new I/O release to avoid disk subsystem flooding. Obviously, this explanation is insufficient. Therefore, I have rummaged through the blogs and other

every developer, including me, spends some time watching him grow. So, I know Step 1: Apply proper indexing in the table columns in the database Step 1. If you create an appropriate index in the column of the table, creating an appropriate index should be the first step in database optimization. However, I think a reasonable index should be taken into consideration first because of the following two points: 1. This will be the most effective measure to improve application

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

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

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 　　

, and the virtual memory counters are two main: Paging file:% usage to monitor the usage ratio of Paging File instances Process:paging File Bytes to monitor the size of virtual memory The more data stored in virtual memory, the greater the gap between the amount of physical memory and the actual demand, the ratio% Usage is only as a reference value, and if the long time is close to 100%, then the system is likely to be abnormal. Second, monitor

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