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raid 10 is created on four physical disks, the average value of the disk queue in a monitoring period is 10, the queue value of each disk is 10/4 = 2.5. Therefore, the disk array has an I/o bottleneck. This is the same as the previous disktime indicator. You don't have to worry about it occasionally. If it appears for a long time, you have to consider solving the disk I/O performance problem. 6. Processor: % Processor Time This is an indicator for mo
Tonight continue to the SQL performance problem sharing, today is mainly a number of specific SQL optimization methods and ideas to share, if you have other ideas later, welcome to explore together, well, into today's theme.Optimized for specific applications where resource consumption is criticalWhat is the first thing to do when there is a
(user_lookups), if these two values are small, you might consider dropping the index.When you restart the SQL Server service, the various counters in the Sys.dm_db_index_usage_stats system view are initialized to null values. In addition, whenever data is detached or closed (for example, because Auto_Close is set to ON), all data rows associated with the database are deleted. When an index is first used, i
Tags: style blog http tar color comDemandRequires that Windows-brought Performance Monitor monitor the following objects of SQL and save the results for later analysis.Performance object: SQL Server databases, counter: Log file (s) size and datafile (s) sizePerformance object: SQL Server:buffer Manager, Counter: page r
Recent project team colleagues told me that there was a SQL performance problem, he said the entire table has only 69 records, client execution cost two minutes, very unscientific. I helped analyze the cause and get it resolved. The following small series installs similar table structure, constructs a case, the test screenshot looks like this: This table has 13800KB (that is, 13M), because the table save
exist and not exist instead of in and not.You can use table links instead of exist. Having can be replaced by where, if not replaced, can be handled in two steps.ExampleSELECT * from ORDERS WHERE customer_name not in (SELECT customer_name from CUSTOMER)OptimizationSELECT * from ORDERS WHERE customer_name not exist (select Customer_name from CUSTOMER)7.2 Do not declare numbers in character format, you want to declare character values in numeric format . (The same date) otherwise invalidates th
framework, but not for testing the correctness of the unit code, but for testing the function, whether the performance of the method meets the requirements. such as Ntime. It can concurrently run the same method multiple times to see if the expected performance targets can be achieved. For example, the following code uses the Ntime framework to start 2 threads and execute the MyTest method multiple times i
:==================================================================================How to view the design of a table or whether the SQL statement is optimized, this way to execute the same SQL statement after indexing, to execute the result.==================================================================================1. Build the index. (built for test performance
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
Chapter 2 procedural performance tuning of PL/SQL applications I. Reasons for PL/SQL Performance problems When the execution efficiency of PL/SQL-based applications is low, it is usually caused by poor SQL statements and prog
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. Alternative use: Once in the analysis of a reconcili
. SQL Server Execution Time: CPU time = 17188 milliseconds, time consuming = 17261 milliseconds. (1 rows affected) SQL Server Execution Time: CPU time = 0 milliseconds, time consuming = 0 milliseconds. */ Comparing 2000 and 2008 can be found 2008 CPU time is significantly higher than 2000, 2008 worktable logical reads, than 2000 of the higher, This has a worktable scanning technology, 20
'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
A few days ago, a friend found me and said a SQL performance problem to see if it could be optimized, the following is the process:Snow Leopard 9:35:10Are you thereOrchid Island Main 15:07:39Busy forgetting, what's up?Snow Leopard 15:07:49WellSnow Leopard 15:07:54Database optimization IssuesOrchid Island Main 15:08:04Oh, you said.Snow Leopard 15:09:09Select Distincta.suite_no,b.bd_nm,b.crt_date from (select
When installing SQL Server 2003 Development edition and Enterprise Edition on Windows Server 2000, Windows XP, or Windows 2008, the "performance counter registry Configuration unit consistency" check will fail (Windows Server 2008 has not been tested due to no environment currently) (Figure 1) The installation error message is: (Figure 2) Solution: First, openHttp://support.microsoft
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 analyzing a reconciliation function, I checked the sy
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 use: When analyzing a reconciliation functi
Label: Overview Conditions of Use Monitoring objects Ways to view real-time SQL monitoring results The following sub-packages for the Dbms_sqltune package Dynamic View Enterprise Managerem Related parameters Changes in each version Examples of real-time SQL monitoring use Reference OverviewThe
Now the development system involves querying by page. when doing this, I am thinking, whether or not the query SQL statement can be automatically encapsulated by parameters into the ability to count the data size of the query statement that is not queried by page. for example, the general practice is: 1. first query based on the concatenated SQL statement: select * fromecs_goodswheregoods_type1limit1000, 10
During database design, sometimes attribute record values belonging to the same person are stored in multiple records for the purpose of data standardization, you want to merge multiple attribute data into one row for display. This is a row-to-column conversion. For example, the score table. What is the efficiency of Row-to-column conversion? I tried the following three methods to perform a row-to-column test. The number of records in the test data table is 120Tens of thousands of fields1
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