sql server session state performance

-consuming to index the above, so the efficiency is lower than using the self-increment field.3, CombGiven the pros and cons of the two primary key types above, the comb type can be used to find a balance for both. Its design idea is this: since the GUID type has no regularity can be made index inefficient, affecting the performance of the system, then can not be combined to preserve the GUID of the first 10 bytes, with the latter 6 bytes to represent

I. Preface After the new installation of SQL Server 2005/2008, We need to configure SQL Server Based on the Server's hardware and software facilities to achieve better performance. However, the default configuration is used in most cases. Ii. Configuration 1.

Use Windows performance monitor to monitor common SQL Server metrics As mentioned in the above article, Win's Performance Monitor is an essential tool for monitoring database performance. Next I will introduce some common monitoring metrics, which are nothing more than disks

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

Unlike other SQL Server databases, tempdb stops at SQL Server and automatically drops and re-create upon restart. by default, a new 8 MB (MDF file: 8 MB; LDF file: 1 MB, autogtouth is set to 10%) recovery model is a simple tempdb database. After the tempdb database is created, DBA can create data objects, temporary

Label:The above article mentions that win's performance Monitor is a necessary tool to monitor database performance, and then I will introduce some common monitoring indicators, in fact, the disk, CPU, memory and other hardware operating indicators and the database itself like the lock Ah, the number of user connections Ah, There are parameter indicators that need attention according to their own business d

data, the same query in different circumstances may produce the opposite result, how to apply well is mainly in our personal understanding and understanding, hope to see this article friends can deepen some understanding of the index and understanding , and get rid of the error of index and develop high performance application. I am not a DBA, just a common developer, the above are some of the actual work experience, experience, in view of my level i

SQL Server Performance Bottleneck analysisFirst, memory bottleneck analysis--sqlserver:buffer ManagerSELECT TOP 312 * from Sys.dm_os_performance_counterswhere object_name = ' Sqlserver:buffer Manager ' ORDER by Counter_name1.Buffer Cache Hit Ratio average >=90%Buffers are buffer page pools that create data pages, which is typically the largest portion of the

Perfmon indexes for SQL Server Performance Optimization Perfmon is a Windows system performance monitoring program. Monitors CPU usage, memory usage, hard disk read/write speed, and network speed.Processor/% Privileged TimeThreshold Value: If the value exceeds 75%, the bottleneck exists.Meaning: This counter indicates

Performance Comparison Between ISNULL and COALESCE in the paging mode of SQL Server, isnullcoalesce Preface In the previous section, we explained the data type and several notes in the string. In this section, we will continue to talk about the number of string lines, other content and interspersed content, short content, and in-depth explanation. (For details, s

to pssdiag is as follows: Pssdiag is a general purpose diagnostic collection utility that Microsoft Product Support Services uses to collect various logs and data files. pssdiag can natively collect performance monitor logs, SQL profiler traces, SQL Server blocking Script output, Windows event logs, and sqldiag output

Tags: monitoring impactSQL Server Extended events (Extended events)-Performance considerationsWhen you use the CREATE event session to place extended event sessions together, you need to carefully configure some settings as they may inadvertently affect performance. You first need to decide whether you want to consume

than the number of rows of data The statements and data used in the example are used only as demos, the actual development application is more complex than the sample data, the same query in different circumstances may produce the opposite result, how to apply well is mainly in our personal understanding and understanding, hope to see this article friends can deepen some understanding of the index and understanding , and get rid of the error of index and develop high

With the growth of time, the company's database will be more and more, query speed will be more and more slow. Open the database to see hundreds of thousands of of data, the query is inevitable not waste time. To improve SQL query effectiveness, you will generally want to build indexes (index) as the first consideration. In fact, in addition to the establishment of the index, when we are in the SQL command

During the work period, the problem of exporting and importing data between databases of different versions is often involved. Simply sort it out and compare the performance. You are welcome to discuss and supplement some methods that are missing. 00. Create a test environment 01. use SQL Server Import and Export Tool 02. Use generate scripts 03. Use BCP

In the initial SQL Server performance issue (2/4), we discussed the list of waiting resources or running session scripts. In this article we will look at how to list blocked sessions with specific information.1 /******************************************************************************************/2 CREATE FUNCTION

statement optimizer that uses is null or is not NULL in the WHERE clause is not allowed to use the index. 3, in and exists exists is far more efficient than in. The inside relates to the full table scan and range scan. Almost all of the in-operation Subcode queries are rewritten as subqueries using exists. 4, in the mass query as little as possible with the format conversion. 5, when in SQL SERVER 2000

Perfmon is Windows System Performance Monitor. Used to monitor CPU usage, memory usage, hard disk read and write speed, network speed, and more.Processor/%privileged timeThreshold: A bottleneck is indicated if the value continues to be greater than 75%.Meaning: This counter represents the percentage of time that a thread uses in privileged mode. When your program calls the operating system's methods (such as file manipulation, network I/O, or allocati

Sometimes, all you do to make the application run faster WorkMake some minor adjustments here or there. But the key lies in determining how to adjust it! Sooner or later, you will encounter this situation: SQLThe query cannot respond as you want. It either does not return data or takes a surprising amount of time. If it reduces the speed of enterprise applications, users must wait for a long time. Users want their applications to respond quickly and their reports can return analysis data instant

Brief introduction In SQL Server, data is stored on a page. When you add a clustered index to a table, SQL Server searches for the data by using the columns of the clustered index as the keyword. Therefore, the impact on performance of the selection of clustered indexes bec