sql server performance tuning books

Label:Original: SQL Server Tuning Series advanced (how the query optimizer runs)ObjectiveIn the previous articles, we introduced a series of basic descriptions of operators and the optimization methods and techniques for each operator. This includes a series of our common operators, including how to view execution plans, how several datasets are commonly used, ho

the statement is executed using the index ....First the nonclustered index contains the column: [Orderid],[customerid]The value we want to get is filtered according to Shippostalcode, so to get the result you have to do a single scan of the nonclustered index (index Scan), which can also, after all, nonclustered indexes are ordered, but in order to filter, you must introduce a bookmark lookup (Key Lookup) To filter, we know that the bookmark lookup is random io, the consumption is huge, so this

variable that saves the returned status of the stored procedure. This variable must be declared in a batch, stored procedure, or function before being used in an execute statement. When it is used to wake up a scalar value user-defined function, the @ return_status variable can be any scalar data type. Procedure_nameThe name of the stored procedure to be called. The process name must comply with the identifier rules. For more information, see use identifiers. Regardless ofCodeThe name of the

Server| Stored Procedure | Execute Execute A user-defined function, system procedure, user-defined stored procedure, or extended stored procedure that performs a scalar value. Also supports the execution of strings within Transact-SQL batches To invoke a function, use the syntax described in EXECUTE stored_procedure. Grammar Execute the stored procedure: [[EXEC [UTE]] { [@return_status =] {procedure_name [

configuration.Linux is rich, powerful, and flexible, and you can do a variety of tasks with it, and in this article we'll discuss some tips for improving the performance of Linux servers.1. Tuning the Linux kernel elevator algorithm for disk I/OAfter selecting the file system, there are some kernel and mount options that may affect its performance, one of which

Label:ObjectiveIn the previous article, we analyzed how the query optimizer works, including: detailed operation steps of the query optimizer, analysis of filter conditions, optimization of index items, and other information.In this article we analyze the detection of several key indicator values in the course of our operation.These indicator values are analyzed to analyze the operation of the statement and to analyze how it is optimized.Through this article we can learn the

reference to ensure that most of the data is useful, that is, to increase the cache hit rate mentioned above.About this reference value, I analyzed the next, in fact, is divided into two cases of analysis.first , if the data table is a heap table, SQL Server gets it only through full table scan. This way, in order to avoid repeated reads, increase the consumption, so that the one-time pre-reading is not re

SQL Server performance optimization skills, SQL Server Performance Optimization 1. Select the most efficient table name sequence (only valid in the rule-based Optimizer) The SQL

SQL Server address search performance optimization and SQL server performance optimization This is an example of a long time ago. Now, I have no intention of discovering the materials, so I will take it out and try again. 1. Requi

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

Some time ago, I had a performance problem with my website, and sometimes the page was very slow to open. It would take more than 10 seconds. I tried a lot of methods, including cache, disable viewstate, and Disable debug mode. The improvements were not obvious. Later, I ran into SQL Server Profiler to check the cause: a slow query dragged down the entire page

Delete stored procedure You can delete stored procedures when they are no longer needed. If another stored procedure calls a deleted stored procedure, Microsoft SQL Server 2000 displays an error message when executing the call procedure. However, if a new stored procedure with the same name and parameters is defined to replace the deleted stored procedure, other processes that reference the procedure can s

With examples and resolution plans, this article shows some tips for improving query efficiency on Microsoft SQL Server. There are many small tips and tricks in programming. Knowing these techniques can extend your ability to optimize your performance. All of our examples in this section choose to use the Microsoft Showplan_all output because it is more compact

Original: SQL Server Tuning Series Basics (Index operations Summary)ObjectivePrevious articles we introduced how to view the query plan, the introduction of common operators, the way of parallel operations, interested can click to view.This article will analyze in SQL Server

following is the optimization of the SQL statement in fact, SQL is not complex, but the data of these tables are slightly larger, but also nested inside more complex business logic, history after several rounds of "master" in the index of the whole side of the optimization, can also run normally but over time, the amount of data in the table is getting larger , boiled frog in warm water,

Books Online logical operators and physical operator references Refer to the book SQL. server.2005. Technical Insider "series Conclusion This article mainly introduces some of the methods of index operation, mainly describes the way we usually apply when writing statements, and to cite a few examples, as a point, in fact, we usually write in the statem

Label:Poptest is the only training institute for developing Test and development engineers in China, aiming at the ability of the trainees to be competent in automated testing, performance testing and testing tools development. In Poptest's LoadRunner training, in order to improve the performance of students experience, add a lot of server optimization knowledge,

Linux server performance is often affected by CPU, memory, disk I/O, network bandwidth, and so on, for each Linux background server developer, it is necessary to master some of the common performance tuning tools. Covering almost every aspect of a system, the tools in the di

Yesterday's SQL Server query performance optimization-index creation principle (I) mainly introduced the principle. today are some of the main principles and checks the created indexes. Iii. indexing principles In general, building indexes depends on the data usage scenarios. In other words, which SQL statements are co

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