I CPUReasons or possible reasons for high usageCPUHigh usage refers to the high number of queries on the physical hard disk; high memory usage refers to the physical disk-Virtual Memory-Multiple data exchanges between three memory types
Anti-virus software may cause faults
SQL Server to troubleshoot high CPU usageThis noon, a friend asked me to help him look at the database, the operating system is WINDOWS2008R2, the database is SQL2008R2 64-bit64G memory, 16-core CPUHardware configuration is still relatively high, he said the
Query the SQL information of oracle processes that occupy the CPU 1: first, use the TOP command to pass the SPID number pid username thr pri nice size res state time cpu COMMAND3575 oracle 1 12 0 0 K 0 K run 748.6 H 24.98% oracle3571 oracle 1 22 0 0 0 K 0 K sleep 706.2 H 22.84% oracle www.2cto.com 2: log on to the data
(3 FObjectType4) include ([Fuserid], [ Faccesstype], [Faccessmask]) with (Statistics_norecompute = off, Ignore_dup_key = off, Allow_row_locks = ON, Allow_page_lo CKS = ON) on [primary]5 GO6 7 Drop index IX_T_ACCESSCONTROL_F4 on T_accesscontrolCPU usage back to normalTrace template and trace file download, use SQL2008R2 version: files.cnblogs.com/lyhabc/trace Template and Trace.rarSummarizeFrom a number of historical experience, if the
;50 ORDER by [Cpu_time] DESCFor example, I am currently executing the query Salesorderdetail_test table 100 times, because the table data is very much, so SSMs needs to take the results of SQL Server execution slowly take away,Cause the async_network_io to wait1 Use [adventureworks]2 GO3 SELECT * FROM dbo. [Salesorderdetail_test]4 GO 100
Source of the pro
Tags: using SP c R time BS SQL text DThe first step:See if these CPUs are used by SQL Server.Step Two:Determine if SQL Server has raised a 17883\17884 errorStep Three:Find out which statements are optimized using the highest CPU. (Sys.dm_exec_query_stats Sys.exec_sql_text)Sy
Tags: os using AR SP c R ad BS SQLThe first type:Compile and recompile the execution plan.The second type:Sorting and aggregation.The third type:Table JOIN operation.The fourth type:max degree of parallelism.The fifth type:Max worker threads.The sixth type:Cost Threadhold parallelism//Each statement its complexity has a cost value as a measure, when the cost value is more than Threadhold parallelism when the SQL ServerYou can use multithreading to imp
Tags: stress test InformixThis is a while doing a query for trading stress tests, using the Aix+informix database. Applications and databases are deployed on two machines, respectively. Use LoadRunner for concurrent testing. The historical data for the related table is 20W level. Test with 20 concurrency.During the test, the application server load is normal, the database
This article is guided by: The trigger causes deadlock, the job is many and frequent, the use of the middle table, the large number of cursors, the design of the index is unreasonable, the transaction operation is frequent, the SQL statement design is unreasonable, will cause the query inefficient, affect the performance of the server. We can use
Tags: How to tab Statement Explorer Properties view SSI where stepThe key to solving this problem is finding SQL statements that cause high CPU usage. The steps are as follows:1. Use the Process Explorer tool to view the Oracle process, double-click the Oracle process, and view the
This is a typical data acquisition and paging. One gets the total number of the latest paging records and one gets the paging records. It is precisely because the CPU usage is too
Tags: src report Introduction to Oracle. COM Stat ROM Understanding testThis blog record in a one-time testing process, the location of high CPU utilization bottleneck problem, the main location of SQL is subject to One, sql command positioning 1. first with top command monitoring system resources, if aix
Background: Performance monitoring shows that the CPU usage of a single core of the online server has reached 100%, which is caused by one of our core services. Thanks to the fact that our service processes are undertaken by multiple identical worker (thread) scheduling tasks, in addition to the high
In the afternoon, a colleague said that a Linux testing server was very slow and seriously affected the work.
Log on to the server and use the top command to check whether the Oracle process accounts for 100% of the CPU.
The following steps are used to find out the SQL statements that cause performance problems:
sys.dm_exec_query_stats:Sys.dm_exec_query_stats returns aggregate performance statistics for the cached query plan. Each query plan corresponds to a row in that view, and the lifetime of the row is associated with the plan itself. When you delete a plan from the cache, the corresponding row is also removed from the view. http://www.hengnay.com/C.v9/ms. Sqlsvr.v9.zh-chs/tsqlref9/html/eb7b58b8-3508-4114-97c2
statementSwitch to text mode Use the following statement to see the execution time of a single statement Go
profile on Set statistics IO
on Set statistics TIME on
/** Target statement to query CPU execution times **/
Set Statistics profile off
Set statistics io off
Set statistics time off
goReason and countermeasure of time-consuming of statement1. Too man
application pool process, there are several processes will have several w3wp.exe, will find that a w3wp.exe process CPU and memory are very high terrible!
Well, let's see what we can do in practice, first of all, windows2003.
First open Windows Task Manager – Click to view-Select columns – Put the PID on the hook!!,,
You can see the PID options in the process.
Click to run-input cmd– input iisapp-a-ver
Label:Trigger reason: At the end of the month when the system checkout the operation of the ERP more, there is a user feedback system between the data transmission for a long time without synchronization. Then to the server to view, did not find a program caused by the problem, looked at the CPU utilization, found that the SQL
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
and provide relevant evidence. A staff member will contact you within 5 working days.