sql server performance counters

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

not fully covered, at least to explain a part. Above we get the results to view the execution time, now let's look at both the query execution plan. Select COALESCE (select MAX (index_id) from sys.indexes WHERE [object_id] = t.[object_id]), 0) from sys.tables as T; select ISNULL (SELECT MAX (index_id) from sys.indexes WHERE [object_id] = t.[object_id]), 0) from sys.tables as T; The above may not be accurate, but also related to hardware configuration, it is possible to coale

1. PrefaceFor the optimization of SQL statements or stored procedures, the former mainly use the following statements to determine the specific execution time, but the SQL environment is complex and changeable, the following statement does not accurately determine whether the performance is improved, if you need to know the CPU, IO and other information, there is

not produce problems with data merging as the self-increment field does.Disadvantages:(1) It is 16 bytes in length and consumes a lot of storage space.(2) This data type is not regular, it is time-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 ineffic

Tags: des style blog http color io os ar strongOriginal: 5. SQL Server database performance monitoring-current requestFor systems running on-line, current database performance monitoring typically monitors the following points:(1) Whether there is obstruction (Blocking);(2) whether there is waiting (waiting), blocking

not regular, it is time-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 lat

Label:Original: SQL Server database Performance tuning tipsThe reasons for the slow query are many, and the following are common: 1. No index or index is not used; 2, I/O throughput is small, forming a bottleneck effect; 3, insufficient memory; 4, the network speed is slow; 5, the amount of data queried is too large; 6, lock or deadlock; 7, the return of unnecess

SqlServer full-text index performance has never been very good. I heard from my colleagues today and found a skill. I went back and tried it. I found that it can significantly improve the full-text index performance, generally, it can be increased by 2 times + original SQL statement: select * fromTable1whereContants (*, test) optimized

It's been a long time since you've written, and DBAs typically have to test server performance before the system is officially online. For example, you have a lot of servers, some do Web server, some do cache server, some do file server, some do database

The database SQLServer is born with the same parent in the Windows operating system, and they have technical connectivity. This is reflected in many aspects. For example, in our daily work, we can adjust some parameters of the Windows operating system to improve the performance of the SQL Server database server. I. res