c# print document barcode Tempdb Contention in Visual Basic .NET

Drawer QR in Visual Basic .NET Tempdb Contention

Tempdb Contention
QR-Code Printer In VB.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create Denso QR Bar Code image in VS .NET applications.
www.OnBarcode.com
Decoding QR Code 2d Barcode In VB.NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Contention occurs when more than one operation, process, or worker thread attempts to access the same resource at the same time. Sometimes the resource is locked. Sometimes a resource such as disk I/O or memory comes under stress and a bottleneck occurs. Creating and dropping a large number of temporary tables and table variables can cause contention on metadata in tempdb. In SQL Server 2005, local temporary tables and table variables are cached to minimize metadata contention. However, for SQL Server to cache a table, no named constraints and no DDL operations (for example, CREATE INDEX and CREATE STATISTICS) can exist on the table after it is created. You can monitor the following performance counters for any unusual increase in temporary objects allocation:
Draw Barcode In VB.NET
Using Barcode creator for .NET framework Control to generate, create bar code image in VS .NET applications.
www.OnBarcode.com
Scanning Barcode In VB.NET
Using Barcode reader for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
SQL Server: Access Methods: Workfiles Created /Sec SQL Server: Access Methods: Worktables Created /Sec SQL Server: Access Methods: Mixed Page Allocations /Sec SQL Server: General Statistics: Temp Tables Created /Sec SQL Server: General Statistics: Temp Tables For Destruction
Paint QR In Visual C#
Using Barcode creation for .NET framework Control to generate, create QR Code ISO/IEC18004 image in Visual Studio .NET applications.
www.OnBarcode.com
Denso QR Bar Code Creator In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create QR-Code image in ASP.NET applications.
www.OnBarcode.com
Lesson 2: Troubleshooting Connectivity to a SQL Server Instance
Generate Quick Response Code In Visual Studio .NET
Using Barcode generation for .NET Control to generate, create QR Code 2d barcode image in Visual Studio .NET applications.
www.OnBarcode.com
UPC-A Encoder In VB.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create UPC-A Supplement 5 image in .NET applications.
www.OnBarcode.com
If the contention in tempdb is caused by excessive DDL operation, you need to look at your application and see whether you can minimize this. If you use stored procedure scoped temporary tables, for example, can you move such tables outside of the stored procedure If you can t, each execution of the stored procedure will cause a create/drop of the temporary table.
Print PDF 417 In Visual Basic .NET
Using Barcode printer for VS .NET Control to generate, create PDF417 image in VS .NET applications.
www.OnBarcode.com
Data Matrix Printer In VB.NET
Using Barcode generator for .NET Control to generate, create Data Matrix 2d barcode image in .NET framework applications.
www.OnBarcode.com
Monitoring Instance Memory Usage
USS Code 128 Generation In VB.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create ANSI/AIM Code 128 image in .NET applications.
www.OnBarcode.com
Creating UPC-E Supplement 5 In Visual Basic .NET
Using Barcode generator for Visual Studio .NET Control to generate, create UCC - 12 image in .NET framework applications.
www.OnBarcode.com
The memory usage of a SQL Server instance typically grows to meet demand and optimization needs, and it can often rise quickly to several hundred megabytes. This type of increase affects the operation of the entire server. The quick fix for this situation is to open Windows Task Manager and determine which instance (or multiple instances) of SQL Server is using excessive RAM. You need to find out who is using the instance so that you do not end that user s session unannounced. As soon as it is safe to do so, locate the SQL Server instance in the Administrative Tools Services console on the SQL Server 2005 server, and then stop and restart it. However, a quick fix is seldom a permanent solution. You need to find out why a particular instance is using excessive memory. If you know which SQL Server instance is using excessive memory and under what conditions, you can use Profiler to generate a trace, which could highlight problems with a specific database, a badly written query, or a rogue application.
Code 39 Full ASCII Drawer In Java
Using Barcode creator for Eclipse BIRT Control to generate, create Code-39 image in Eclipse BIRT applications.
www.OnBarcode.com
USS-128 Creator In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create GS1 128 image in ASP.NET applications.
www.OnBarcode.com
Data Caching
QR Code Decoder In C#.NET
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Drawing UCC - 12 In None
Using Barcode generator for Office Excel Control to generate, create UPCA image in Excel applications.
www.OnBarcode.com
SQL Server 2005 introduces a uniform caching framework that implements a clock algorithm. Currently, it uses two timers or clock hands an internal clock hand and an external clock hand. The internal clock hand controls the size of a cache relative to other caches. It starts moving when the framework predicts that the cache is about to reach its upper limit. The external clock hand starts to move when SQL Server as a whole is experiencing memory pressure. Movement of the external clock hand can be caused by external memory pressure, internal memory pressure, or both. Information about clock hand movements is exposed through the sys.dm_os_memory_cache_clock_hands DMV as shown in the following code:
Scanning Code 128 Code Set B In VS .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Encoding EAN 13 In None
Using Barcode generator for Office Word Control to generate, create UPC - 13 image in Microsoft Word applications.
www.OnBarcode.com
SELECT * FROM sys.dm_os_memory_cache_clock_hands WHERE rounds_count > 0 AND removed_all_rounds_count > 0
Scanning UPC - 13 In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Drawing Bar Code In VS .NET
Using Barcode creator for Reporting Service Control to generate, create bar code image in Reporting Service applications.
www.OnBarcode.com
1
Troubleshooting Database and Server Performance
Each cache entry has a separate row for the internal and external clock hand. If you see increasing rounds_count and removed_all_rounds_count when an instance is running, data cache is under internal or external memory pressure.
Analyzing Statement Recompiles
Compilation is a significant part of a query s turnaround time, and SQL Server must compile each unique query at least once. The SQL Server 2005 database engine saves compiled query plans in a query cache for later use, thus saving recompilation time. However, when a batch or remote procedure call (RPC) is submitted to SQL Server, before it begins executing, the server checks for the validity and correctness of the query plan. If one of these checks fails, SQL Server might have to recompile the batch to produce a different query plan. Recompilations can also occur when SQL Server determines that there could be a more optimal query plan because of changes in underlying data. Compilations are CPU intensive, and excessive recompilations can result in a performance problem. SQL Server 2005 introduces statement-level recompilation of stored procedures. When SQL Server 2005 recompiles stored procedures, it recompiles only the statement that caused the recompilation not the entire procedure. The SQL Server: SQL Statistics object provides counters to monitor compilation. You need to monitor the number of query compilations and recompilations in conjunction with the number of batches received to find out whether compiles are contributing to high CPU use. You should monitor the following counters:
SQL Server: SQL Statistics: Batch Requests/sec SQL Server: SQL Statistics: SQL Compilations/sec SQL Server: SQL Statistics: SQL Recompilations/sec
If these counters indicate a high number of recompiles, you then need to look at the SP:Recompile and SQL: StmtRecompile event classes in a Profiler trace to determine which stored procedures SQL Server recompiles. The following list shows the key data columns you should monitor:
EventClass EventSubClass ObjectID SPID (server process identifier)
Copyright © OnBarcode.com . All rights reserved.