sql performance counters

after you've processed historical data and report data, then add these new hardware, such as faster CPUs and hard drives, larger memory, and so on, but add new hardware postscript to modify your SQL Server configuration to accommodate these new hardware, such as opening/ 3G switch to use more memory. Scale out when scaling the up does isn't suffice or is cost-prohibitive. Use horizontal expansion When you are still not satisfied with the upward exp

Tags: Performance image view function mit return virt src Createdynamic management Views: Specific instance statements: --on the basic situation of statement executionSELECT * FROM Sys.dm_exec_query_stats--dynamic management functions need to provide parametersSelect Top Ten Execution_count,total_worker_time,t.text,total_worker_time/execution_countAs Avgcpu from Sys.dm_exec_query_stats as SCross apply Sys.dm_exec_sql_text (S.sql_handle) as TORDER BY

can ensure that the database will faint. In addition, execution plans can be reused, and the simpler SQL statements are more likely to be reused. Complex SQL statements have to be re-parsed as long as one character changes, and then the bulk of the garbage is stuck in memory. It is conceivable how inefficient the database will be. 4. Staging intermediate results using temporary table An important way to si

that the database will faint.In addition, execution plans can be reused, and the simpler SQL statements are more likely to be reused. Complex SQL statements have to be re-parsed as long as one character changes, and then the bulk of the garbage is stuck in memory. It is conceivable how inefficient the database will be.4. Staging intermediate results using temporary tableAn important way to simplify

In practical applications, there are 3 ways to analyze a single query SQL performance: Show status, show profiles, and slow query logs. First, use show profile 1, the default is disabled, open in the session #开启profileSet profiling=1; 2. When a query arrives at the server, the tool logs the profiling information to a temporary table and gives the query an integer identifier starting at 1, which can be v

specific performance indicators of SQLSERVER, you need to use the following counters Processor: % Processor Time: The average should be lower than 75% (preferably lower than 50%) System: Processor Queue Length: Each logical CPU should be less than 2 on average. For example, on a 2 logical CPU machine, it should be kept at 4 Memory-Pages/sec: The average should be less than 20 (preferably less than 15%) Mem

Optimizing SQL queries: How to write high-performance SQL statements1, first to understand what is called the implementation plan?An execution plan is a query scheme that the database makes based on the statistics of SQL statements and related tables, which are generated automatically by the query optimizer, such as an

one of the most critical factors in SQL Server performance. The relationship between memory and I/O subsystem is also a very important factor. For example, in a system with frequent I/O operations, the more available memory SQL Server uses to cache data, the less physical I/O that must be performed. This is because the data is read from the data cache rather tha

Tags: style blog http color using SP strong on dataRecently a friend and I explored whether statements about where 1=1 and this form would affect performance. The final conclusion is not affected. Although the conclusion is correct, the understanding of the problem is far from the root of solving the problem. In fact, in the writing process of T-SQL statements often make a very narrow conclusion, and then d

In earlier articles, the detect methodology in performance tuning was mentioned, and the Detect methodology was briefly reviewed here.Discover the problem: finding problemsExplore The conditions: Reasons to exploreTrack down possible approaches: providing a possible solutionExecute the most likely approach: perform the best possible solutionCheck of Success: Confirm success (if not successful, repeat the above steps)Tie up Loose Ends: complete Remaini

Is it possible to answer this question in just a few seconds? You may try to view the performance counters in Performance Monitor PerfMon. There are about 1000 counters with different names. You may ask: "Skipped Ghosted Records/sec" number of phantom Records Skipped per second) = 10. Is this value good or bad? The cor

After a piece of SQL code is written, you can initially predict the performance of the SQL at run time by looking at the SQL execution plan, especially if you find that the SQL statement is inefficient, we can analyze the problem of the