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MS SQL Server Benchmark and Stress Test Tools? Bsohn417 asked on 2007-06-29. Microsoft SQL Server 2005; Microsoft SQL Server; 4 Comments. But I also want something server-side base for our enterprise build server. I am not looking for a replay feature (Yes it could do the trick but it would be difficult to program a lot of different scenarios) I’ve look at the following tools: RML Utilities from Microsoft; DTM DB Stress (this is the closest to what I’m looking for) SQL Stress. Apr 22, 2019 The whole idea with load testing is that you’re trying to mimic your own workloads. If you’re just trying to test a server with generic workloads, start with my post, “How to Check Performance on a New SQL Server.” Single-Query Load Tests. These tools let you write a query, and then run that query lots of times to stress load.-->
This article describes how to use the SQLIOSim utility to perform stress tests on disk subsystems to simulate SQL Server activity.
Original product version: SQL Server
Original KB number: 231619Summary
For Microsoft SQL Server 2005, SQLIOSim was shipped as a separate download package. Starting with SQL Server 2008, SQLIOSim is included with the SQL Server product installation. When you install SQL Server, you find the SQLIOSim tool in the BINN folder of your SQL Server installation. It is recommended to use these updated versions of the tool to simulate the IO activity on the disk subsystem.
The SQLIOSim utility replaces the SQLIOStress utility. The SQLIOStress utility was formerly known as the SQL70IOStress utility.
This article also contains download information for the SQLIOSim utility.Introduction
This article describes the SQLIOSim tool. You can use this tool to perform reliability and integrity tests on disk subsystems. These tests simulate read, write, checkpoint, backup, sort, and read-ahead activities for Microsoft SQL Server. However, if you have to perform benchmark tests and determine the I/O capacity of the storage system, you should use the Diskspd tool.Overview
The SQLIOSim utility has been upgraded from the SQLIOStress utility. The SQLIOSim utility more accurately simulates the I/O patterns of Microsoft SQL Server.
For more information about SQL Server I/O patterns, see SQL Server I/O Basics, Chapter 2.
Note
To help maintain appropriate data integrity and security, we recommend that you perform stress tests of your I/O subsystem before you deploy SQL Server on new hardware. The SQLIOSim utility simulates the read patterns, the write patterns, and the problem identification techniques of SQL Server. To perform these tasks, the SQLIOSim utility simulates the user activity and the system activity of a SQL Server system. The SQLIOSim utility performs this simulation independent of the SQL Server engine.
The SQLIOSim utility does not guarantee or warrant data security or integrity. The utility was designed to provide baseline testing of a system environment. The SQLIOSim utility may expose potential data integrity issues.
For more information about logging and data storage, see Description of logging and data storage algorithms that extend data reliability in SQL Server.
The download package contains two executable files, SQLIOSim.com and SQLIOSim.exe. Both executable files provide identical simulation capabilities. SQLIOSim.com is a command-line tool that you can configure to run without user interaction. To do this, you can use command-line parameters, a configuration file, or a combination of both of these methods. SQLIOSim.exe is a graphical application that accepts no command-line parameters. However, SQLIOSim.exe does load default configuration data from configuration files.SQLIOSim.com command-line parameters
SQLIOSim.com accepts a limited number of command-line parameters to control basic behavior. The configuration file for the SQLIOSim utility provides advanced behavior control. When command-line parameters and configuration file options overlap, the command-line parameters take precedence.ParameterComment-cfg fileOverride the Sqliosim.cfg.ini default configuration file. The SQLIOSim utility returns an error if the utility cannot find the file.-save fileSave the resulting configuration in the configuration file. You can use this option to create the initial configuration file.-log fileSpecify the error log file name and the error log file path. The default file name is Sqliosim.log.xml.-dir dirSet the location to create the data (.mdf) file and the log (.ldf) file. You can run this command multiple times. In most cases, this location is a drive root or a volume mount point. This location can be a long path or a UNC path.-d secondsSet the duration of the main run. This value excludes the preparation phase and the verification phase.-size MBSet the initial size of the data file in megabytes (MB). The file can grow up to two times the initial size. The size of the log file is calculated as half the size of the data file. However, the log file cannot be larger than 50 MB.SQLIOSim configuration file
Sample configuration files for various tests can be downloaded from SQL Server support team’s github repo here.
You do not have to use a configuration file. If you do not use a configuration file, all parameters take default values except the data file location and the log file location. You must use one of the following methods to specify the data file location and the log file location:
*Use the command-line parameters in the SQLIOSim.com file.
*Use the Files and Configuration dialog box after you run the SQLIOSim.exe file.
*Use the Filex section of the configuration file.
Note
*If the name of the parameter indicates that the parameter is a ratio or a percentage, the value of the parameter is expressed as the percentage or the ratio, divided by 0.01. For example, the value of the CacheHitRatio parameter is 10 percent. This value is expressed as 1000 because 10, divided by 0.01, equals 1000. The maximum value of a percentage parameter is 10000.
*If the parameter type is numeric, and you assign a non-numeric value to the parameter, the SQLIOSim utility sets the parameter to 0.
*If the parameter type is Boolean, the valid values that you can assign to the parameter are true and false . Additionally, the values are case sensitive. The SQLIOSim utility ignores any invalid values.
*If a pair of parameters indicates a minimum value and a maximum value, the minimum value must not be larger than the maximum value. For example, the value of the MinIOChainLength parameter must not be larger than the value of the MaxIOChainLength parameter.
*If the parameter indicates a number of pages, the SQLIOSim utility checks the value that you assign to the parameter against the file that the SQLIOSim utility processes. The SQLIOSim utility performs this check to make sure that the number of pages does not exceed the file size.CONFIG section
The SQLIOSim utility takes the values that you specify in the CONFIG section of the SQLIOSim configuration file to establish global testing behavior.ParameterDefault valueDescriptionCommentsErrorFilesqliosim.log.xmlName of the XML type log fileCPUCountNumber of CPUs on the computerNumber of logical CPUs to createThe maximum is 64 CPUs.Affinity0Physical CPU affinity mask to apply for logical CPUsThe affinity mask should be within the active CPU mask. A value of
0 means that all available CPUs will be used.MaxMemoryMBAvailable physical memory when the SQLIOSim utility startsSize of the buffer pool in MBThe value cannot exceed the total amount of physical memory on the computer.StopOnErrortrueStops the simulation when the first error occursTestCycles1Number of full test cycles to performA value of 0 indicates an infinite number of test cycles.TestCycleDuration300Duration of a test cycle in seconds, excluding the audit pass at the end of the cycleCacheHitRatio1000Simulated cache hit ratio when the SQLIOSim utility reads from the diskMaxOutstandingIO0Maximum number of outstanding I/O operations that are allowed process-wideThe value cannot exceed 140000. A value of 0 means that up to approximately 140,000 I/O operations are allowed. This is the limit of the utility.TargetIODuration100Duration of I/O operations, in milliseconds, that are targeted by throttlingIf the average I/O duration exceeds the target I/O duration, the SQLIOSim utility throttles the number of outstanding I/O operations to decrease the load and to improve I/O completion time.AllowIOBurststrueAllow for turning off throttling to post many I/O requestsI/O bursts are enabled during the initial update, initial checkpoint, and final checkpoint passes at the end of test cycles. The MaxOutstandingIO parameter is still honored. You can expect long I/O warnings.NoBufferingtrueUse the FILE_FLAG_NO_BUFFERING optionSQL Server opens database files by using FILE_FLAG_NO_BUFFERING true. Some utilities and services, such as Analysis Services, use FILE_FLAG_NO_BUFFERING false. To fully test a server, execute one test for each setting.WriteThroughtrueUse the FILE_FLAG_WRITE_THROUGH optionSQL Server opens database files by using FILE_FLAG_WRITE_THROUGH true. However, some utilities and services open the database files by using FILE_FLAG_WRITE_THROUGH false. For example, SQL Server Analysis Services opens the database files by using FILE_FLAG_WRITE_THROUGH false. To fully test a server, execute one test for each setting.ScatterGathertrueUse ReadScatter/WriteGather APIsIf this parameter is set to true, the NoBuffering parameter is also set to true.
SQL Server uses scatter/gather I/Os for most I/O requests.ForceReadAheadtruePerform a read-ahead operation even if the data is already readThe SQLIOSim utility issues the read command even if the data page is already in the buffer pool.
Microsoft SQL Server Support has successfully used the true setting to expose I/O problems.DeleteFilesAtStartuptrueDelete files at startup if files existA file may contain multiple data streams. Only streams that are specified in the File x FileName entry are truncated in the file. If the default stream is specified, all streams are deleted.DeleteFilesAtShutdownfalseDelete files after the test is finishedA file may contain multiple data streams. Only data streams that you specify in the File x FileName entry are truncated in the file. If the default data stream is specified, the SQLIOSim utility deletes all data streams.StampFilesfalseExpand the file by stamping zerosThis process may take a long time if the file is large. If you set this parameter to false, the SQLIOSim utility extends the file by setting a valid data marker.
SQL Server 2005 uses the instant file initialization feature for data files. If the data file is a log file, or if instant file initialization is not enabled, SQL Server performs zero stamping. Versions of SQL Server earlier than SQL Server 2000 always perform zero stamping.
You should switch the value of the StampFiles parameter during testing to make sure that both instant file initialization and zero stamping are operating correctly.Filex section
The SQLIOSim utility is designed to allow for multiple file testings. The File x section is represented as [File1], [File2] for each file in the test.
Slime Rancher MacOSX Activated Full Download Slime Rancher Free MacOSX Download – ACTiVATED Son of Salimi Rancher 2021: This is Beatrix Lee Bea, a young and terrifying keeper who tries to prove himself for a thousand years of life on Earth and by making living pieces. Slime Rancher, free and safe download. Slime Rancher latest version: Corral all those cute slugs. Have you ever dreamed of being the master of a farm full of kawaii slugs? Slime Rancher is what y. Slime Rancher is a life simulation video game developed and published by American indie studio Monomi Park. The game was released as an early access title in January 2016, with an official release on Windows, macOS, Linux and Xbox One on August 1, 2017. A PlayStation 4 version was released on. Slime Rancher for Mac, free and safe download. Slime Rancher latest version: Corral all those cute slugs. Have you ever dreamed of being the master of a farm full of kawaii slugs? Slime Rancher is what y. Slime Rancher MAC Game Free Download. Download DMG + Crack. Slime Rancher Free MacOSX Download – ACTiVATED. Slime Rancher MAC Game is a genuinely charming, sandbox experience based on first-person. Take on the role of Beatrix LeBeau: a young rancher who has journeyed out for a life at a place that is a thousand light-years away from Earth on. Slime rancher download gratis mac.ParameterDefault valueDescriptionCommentsFileNameNo default valueFile name and pathThe FileName parameter can be a long path or a UNC path. It can also include a secondary stream name and type. For example, the FileName parameter may be set to file.mdf:stream2.
NOTE In SQL Server 2005, DBCC operations use streams. We recommend that you perform stream tests.InitialSizeNo default valueInitial size in MBIf the existing file is larger than the value that is specified for the InitialSize parameter, the SQLIOSim utility does not shrink the existing file. If the existing file is smaller, the SQLIOSim utility expands the existing file.MaxSizeNo default valueMaximum size in MBA file cannot grow larger than the value that you specify for the MaxSize parameter.Increment0Size in MB of the increment by which the file grows or shrinks. For more information, see the ’ShrinkUser section’ part of this article.The SQLIOSim utility adjusts the Increment parameter at startup so that the following situation is established:Increment * MaxExtents < MaxMemoryMB / NumberOfDataFiles
If the result is 0, the SQLIOSim utility sets the file as non-shrinkable.ShrinkablefalseIndicates whether the file can be shrunk or expandedIf you set the Increment parameter to 0, you set the file to be non-shrinkable. In this case, you must set the Shrinkable parameter to false. If you set the Increment parameter to a value other than 0, you set the file to be shrinkable. In this case, you must set the Shrinkable parameter to true.SparsefalseIndicates whether the Sparse attribute should be set on the filesFor existing files, the SQLIOSim utility does not clear the Sparse attribute when you set the Sparse parameter to false.
SQL Server 2005 uses sparse files to support snapshot databases and the secondary DBCC streams.
We recommend that you enable both the sparse file and the streams, and then perform a test pass.
NOTE If you set Sparse = true for the file settings, do not specify NoBuffering = false in the config section. If you use these two conflicting combinations, you may receive an error that resembles the following from the tool:
Error:-Error: 0x80070467
Error Text: While accessing the hard disk, a disk operation failed even after retries.
Description: Buffer validation failed on C:SQLIOSim.mdx Page: 28097LogFilefalseIndicates whether a file contains user or transaction log dataYou should define at least one-log file.RandomUser section
The SQLIOSim utility takes the values that you specify in the RandomUser section to simulate a SQL Server worker that is performing random query operations, such as Online Transaction Processing (OLTP) I/O patterns.ParameterDefault valueDescriptionCommentsUserCount-1Number of random access threads that are executing at the same timeThe value cannot exceed the following value: CPUCount1023-100
The total number of all users also cannot exceed this value. A value of 0 means that you cannot create random access users. A value of -1 means that you must use the automatic configuration of the following value: min(CPUCount2, 8)
NOTE A SQL Server system may have thousands of sessions. Most of the sessions do not have active requests. Use the count(*) function in queries against the sys.dm_exec_requests dynamic management view (DMV) as a baseline for establishing this test parameter value.
CPUCount here refers to the value of the CPUCount parameter in the CONFIG section.
The min(CPUCount*2, 8) value results in the smaller of the values between CPUCount*2 and 8.JumpToNewRegionPercentage500The chance of a jump to a new region of the fileThe start of the region is randomly selected. The size of the region is a random value between the value of the MinIOChainLength parameter and the value of the MaxIOChainLength parameter.MinIOChainLength1Minimum region size in pagesMaxIOChainLength100Maximum region size in pagesSQL Server 2005 Enterprise Edition and SQL Server 2000 Enterprise Edition can read ahead up to 1,024 pages.
The minimum value is 0. The maximum value is limited by system memory.
Typically, random user activity causes small scanning operations to occur. Use the values that are specified in the ReadAheadUser section to simulate larger scanning operations.RandomUserReadWriteRatio9000Percentage of pages to be updatedA random-length chain is selected in the region and may be read. This parameter defines the percentage of the pages to be updated and written to disk.MinLogPerBuffer64Minimum log record size in bytesThe value must be either a multiple of the on-disk sector size or a size that fits evenly into the on-disk sector size.MaxLogPerBuffer8192Maximum log record size in bytesThis value cannot exceed 64000. The value must be a multiple of the on-disk sector size.RollbackChance100The chance that an in-memory operation will occur that causes a rollback operation to occur.When this rollback operation occurs, SQL Server does not write to the log file.SleepAfter5Sleep time after each cycle, in millisecondsAuditUser section
The SQLIOSim utility takes the values that you specify in the AuditUser section to simulate DBCC activity to read and to audit the information about the page. Validation occurs even if the value of the UserCount parameter is set to 0.ParameterDefault valueDescriptionCommentsUserCount2Number of Audit threadsThe value cannot exceed the following value: CPUCount1023-100
The total number of all users also cannot exceed this value. A value of 0 means that you cannot create random access users. A value of -1 means that you must use the automatic configuration of the following value: min(CPUCount2, 8)
NOTE A SQL Server system may have thousands of sessions. Most of the sessions do not have active requests. Use the count(*) function in queries against the sys.dm_exec_requests DMV as a baseline for establishing this test parameter value.
CPUCount here refers to the value of the CPUCount parameter in the CONFIG section.
The min(CPUCount*2, 8) value results in the smaller of the values between CPUCount*2 and 8.BuffersValidated64DelayAfterCycles2Apply the AuditDelay parameter after the number of BuffersValidated cycles is completedAuditDelay200Number of milliseconds to wait after each DelayAfterCycles operationMs Sql Ser
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MS SQL Server Benchmark and Stress Test Tools? Bsohn417 asked on 2007-06-29. Microsoft SQL Server 2005; Microsoft SQL Server; 4 Comments. But I also want something server-side base for our enterprise build server. I am not looking for a replay feature (Yes it could do the trick but it would be difficult to program a lot of different scenarios) I’ve look at the following tools: RML Utilities from Microsoft; DTM DB Stress (this is the closest to what I’m looking for) SQL Stress. Apr 22, 2019 The whole idea with load testing is that you’re trying to mimic your own workloads. If you’re just trying to test a server with generic workloads, start with my post, “How to Check Performance on a New SQL Server.” Single-Query Load Tests. These tools let you write a query, and then run that query lots of times to stress load.-->
This article describes how to use the SQLIOSim utility to perform stress tests on disk subsystems to simulate SQL Server activity.
Original product version: SQL Server
Original KB number: 231619Summary
For Microsoft SQL Server 2005, SQLIOSim was shipped as a separate download package. Starting with SQL Server 2008, SQLIOSim is included with the SQL Server product installation. When you install SQL Server, you find the SQLIOSim tool in the BINN folder of your SQL Server installation. It is recommended to use these updated versions of the tool to simulate the IO activity on the disk subsystem.
The SQLIOSim utility replaces the SQLIOStress utility. The SQLIOStress utility was formerly known as the SQL70IOStress utility.
This article also contains download information for the SQLIOSim utility.Introduction
This article describes the SQLIOSim tool. You can use this tool to perform reliability and integrity tests on disk subsystems. These tests simulate read, write, checkpoint, backup, sort, and read-ahead activities for Microsoft SQL Server. However, if you have to perform benchmark tests and determine the I/O capacity of the storage system, you should use the Diskspd tool.Overview
The SQLIOSim utility has been upgraded from the SQLIOStress utility. The SQLIOSim utility more accurately simulates the I/O patterns of Microsoft SQL Server.
For more information about SQL Server I/O patterns, see SQL Server I/O Basics, Chapter 2.
Note
To help maintain appropriate data integrity and security, we recommend that you perform stress tests of your I/O subsystem before you deploy SQL Server on new hardware. The SQLIOSim utility simulates the read patterns, the write patterns, and the problem identification techniques of SQL Server. To perform these tasks, the SQLIOSim utility simulates the user activity and the system activity of a SQL Server system. The SQLIOSim utility performs this simulation independent of the SQL Server engine.
The SQLIOSim utility does not guarantee or warrant data security or integrity. The utility was designed to provide baseline testing of a system environment. The SQLIOSim utility may expose potential data integrity issues.
For more information about logging and data storage, see Description of logging and data storage algorithms that extend data reliability in SQL Server.
The download package contains two executable files, SQLIOSim.com and SQLIOSim.exe. Both executable files provide identical simulation capabilities. SQLIOSim.com is a command-line tool that you can configure to run without user interaction. To do this, you can use command-line parameters, a configuration file, or a combination of both of these methods. SQLIOSim.exe is a graphical application that accepts no command-line parameters. However, SQLIOSim.exe does load default configuration data from configuration files.SQLIOSim.com command-line parameters
SQLIOSim.com accepts a limited number of command-line parameters to control basic behavior. The configuration file for the SQLIOSim utility provides advanced behavior control. When command-line parameters and configuration file options overlap, the command-line parameters take precedence.ParameterComment-cfg fileOverride the Sqliosim.cfg.ini default configuration file. The SQLIOSim utility returns an error if the utility cannot find the file.-save fileSave the resulting configuration in the configuration file. You can use this option to create the initial configuration file.-log fileSpecify the error log file name and the error log file path. The default file name is Sqliosim.log.xml.-dir dirSet the location to create the data (.mdf) file and the log (.ldf) file. You can run this command multiple times. In most cases, this location is a drive root or a volume mount point. This location can be a long path or a UNC path.-d secondsSet the duration of the main run. This value excludes the preparation phase and the verification phase.-size MBSet the initial size of the data file in megabytes (MB). The file can grow up to two times the initial size. The size of the log file is calculated as half the size of the data file. However, the log file cannot be larger than 50 MB.SQLIOSim configuration file
Sample configuration files for various tests can be downloaded from SQL Server support team’s github repo here.
You do not have to use a configuration file. If you do not use a configuration file, all parameters take default values except the data file location and the log file location. You must use one of the following methods to specify the data file location and the log file location:
*Use the command-line parameters in the SQLIOSim.com file.
*Use the Files and Configuration dialog box after you run the SQLIOSim.exe file.
*Use the Filex section of the configuration file.
Note
*If the name of the parameter indicates that the parameter is a ratio or a percentage, the value of the parameter is expressed as the percentage or the ratio, divided by 0.01. For example, the value of the CacheHitRatio parameter is 10 percent. This value is expressed as 1000 because 10, divided by 0.01, equals 1000. The maximum value of a percentage parameter is 10000.
*If the parameter type is numeric, and you assign a non-numeric value to the parameter, the SQLIOSim utility sets the parameter to 0.
*If the parameter type is Boolean, the valid values that you can assign to the parameter are true and false . Additionally, the values are case sensitive. The SQLIOSim utility ignores any invalid values.
*If a pair of parameters indicates a minimum value and a maximum value, the minimum value must not be larger than the maximum value. For example, the value of the MinIOChainLength parameter must not be larger than the value of the MaxIOChainLength parameter.
*If the parameter indicates a number of pages, the SQLIOSim utility checks the value that you assign to the parameter against the file that the SQLIOSim utility processes. The SQLIOSim utility performs this check to make sure that the number of pages does not exceed the file size.CONFIG section
The SQLIOSim utility takes the values that you specify in the CONFIG section of the SQLIOSim configuration file to establish global testing behavior.ParameterDefault valueDescriptionCommentsErrorFilesqliosim.log.xmlName of the XML type log fileCPUCountNumber of CPUs on the computerNumber of logical CPUs to createThe maximum is 64 CPUs.Affinity0Physical CPU affinity mask to apply for logical CPUsThe affinity mask should be within the active CPU mask. A value of
0 means that all available CPUs will be used.MaxMemoryMBAvailable physical memory when the SQLIOSim utility startsSize of the buffer pool in MBThe value cannot exceed the total amount of physical memory on the computer.StopOnErrortrueStops the simulation when the first error occursTestCycles1Number of full test cycles to performA value of 0 indicates an infinite number of test cycles.TestCycleDuration300Duration of a test cycle in seconds, excluding the audit pass at the end of the cycleCacheHitRatio1000Simulated cache hit ratio when the SQLIOSim utility reads from the diskMaxOutstandingIO0Maximum number of outstanding I/O operations that are allowed process-wideThe value cannot exceed 140000. A value of 0 means that up to approximately 140,000 I/O operations are allowed. This is the limit of the utility.TargetIODuration100Duration of I/O operations, in milliseconds, that are targeted by throttlingIf the average I/O duration exceeds the target I/O duration, the SQLIOSim utility throttles the number of outstanding I/O operations to decrease the load and to improve I/O completion time.AllowIOBurststrueAllow for turning off throttling to post many I/O requestsI/O bursts are enabled during the initial update, initial checkpoint, and final checkpoint passes at the end of test cycles. The MaxOutstandingIO parameter is still honored. You can expect long I/O warnings.NoBufferingtrueUse the FILE_FLAG_NO_BUFFERING optionSQL Server opens database files by using FILE_FLAG_NO_BUFFERING true. Some utilities and services, such as Analysis Services, use FILE_FLAG_NO_BUFFERING false. To fully test a server, execute one test for each setting.WriteThroughtrueUse the FILE_FLAG_WRITE_THROUGH optionSQL Server opens database files by using FILE_FLAG_WRITE_THROUGH true. However, some utilities and services open the database files by using FILE_FLAG_WRITE_THROUGH false. For example, SQL Server Analysis Services opens the database files by using FILE_FLAG_WRITE_THROUGH false. To fully test a server, execute one test for each setting.ScatterGathertrueUse ReadScatter/WriteGather APIsIf this parameter is set to true, the NoBuffering parameter is also set to true.
SQL Server uses scatter/gather I/Os for most I/O requests.ForceReadAheadtruePerform a read-ahead operation even if the data is already readThe SQLIOSim utility issues the read command even if the data page is already in the buffer pool.
Microsoft SQL Server Support has successfully used the true setting to expose I/O problems.DeleteFilesAtStartuptrueDelete files at startup if files existA file may contain multiple data streams. Only streams that are specified in the File x FileName entry are truncated in the file. If the default stream is specified, all streams are deleted.DeleteFilesAtShutdownfalseDelete files after the test is finishedA file may contain multiple data streams. Only data streams that you specify in the File x FileName entry are truncated in the file. If the default data stream is specified, the SQLIOSim utility deletes all data streams.StampFilesfalseExpand the file by stamping zerosThis process may take a long time if the file is large. If you set this parameter to false, the SQLIOSim utility extends the file by setting a valid data marker.
SQL Server 2005 uses the instant file initialization feature for data files. If the data file is a log file, or if instant file initialization is not enabled, SQL Server performs zero stamping. Versions of SQL Server earlier than SQL Server 2000 always perform zero stamping.
You should switch the value of the StampFiles parameter during testing to make sure that both instant file initialization and zero stamping are operating correctly.Filex section
The SQLIOSim utility is designed to allow for multiple file testings. The File x section is represented as [File1], [File2] for each file in the test.
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NOTE In SQL Server 2005, DBCC operations use streams. We recommend that you perform stream tests.InitialSizeNo default valueInitial size in MBIf the existing file is larger than the value that is specified for the InitialSize parameter, the SQLIOSim utility does not shrink the existing file. If the existing file is smaller, the SQLIOSim utility expands the existing file.MaxSizeNo default valueMaximum size in MBA file cannot grow larger than the value that you specify for the MaxSize parameter.Increment0Size in MB of the increment by which the file grows or shrinks. For more information, see the ’ShrinkUser section’ part of this article.The SQLIOSim utility adjusts the Increment parameter at startup so that the following situation is established:Increment * MaxExtents < MaxMemoryMB / NumberOfDataFiles
If the result is 0, the SQLIOSim utility sets the file as non-shrinkable.ShrinkablefalseIndicates whether the file can be shrunk or expandedIf you set the Increment parameter to 0, you set the file to be non-shrinkable. In this case, you must set the Shrinkable parameter to false. If you set the Increment parameter to a value other than 0, you set the file to be shrinkable. In this case, you must set the Shrinkable parameter to true.SparsefalseIndicates whether the Sparse attribute should be set on the filesFor existing files, the SQLIOSim utility does not clear the Sparse attribute when you set the Sparse parameter to false.
SQL Server 2005 uses sparse files to support snapshot databases and the secondary DBCC streams.
We recommend that you enable both the sparse file and the streams, and then perform a test pass.
NOTE If you set Sparse = true for the file settings, do not specify NoBuffering = false in the config section. If you use these two conflicting combinations, you may receive an error that resembles the following from the tool:
Error:-Error: 0x80070467
Error Text: While accessing the hard disk, a disk operation failed even after retries.
Description: Buffer validation failed on C:SQLIOSim.mdx Page: 28097LogFilefalseIndicates whether a file contains user or transaction log dataYou should define at least one-log file.RandomUser section
The SQLIOSim utility takes the values that you specify in the RandomUser section to simulate a SQL Server worker that is performing random query operations, such as Online Transaction Processing (OLTP) I/O patterns.ParameterDefault valueDescriptionCommentsUserCount-1Number of random access threads that are executing at the same timeThe value cannot exceed the following value: CPUCount1023-100
The total number of all users also cannot exceed this value. A value of 0 means that you cannot create random access users. A value of -1 means that you must use the automatic configuration of the following value: min(CPUCount2, 8)
NOTE A SQL Server system may have thousands of sessions. Most of the sessions do not have active requests. Use the count(*) function in queries against the sys.dm_exec_requests dynamic management view (DMV) as a baseline for establishing this test parameter value.
CPUCount here refers to the value of the CPUCount parameter in the CONFIG section.
The min(CPUCount*2, 8) value results in the smaller of the values between CPUCount*2 and 8.JumpToNewRegionPercentage500The chance of a jump to a new region of the fileThe start of the region is randomly selected. The size of the region is a random value between the value of the MinIOChainLength parameter and the value of the MaxIOChainLength parameter.MinIOChainLength1Minimum region size in pagesMaxIOChainLength100Maximum region size in pagesSQL Server 2005 Enterprise Edition and SQL Server 2000 Enterprise Edition can read ahead up to 1,024 pages.
The minimum value is 0. The maximum value is limited by system memory.
Typically, random user activity causes small scanning operations to occur. Use the values that are specified in the ReadAheadUser section to simulate larger scanning operations.RandomUserReadWriteRatio9000Percentage of pages to be updatedA random-length chain is selected in the region and may be read. This parameter defines the percentage of the pages to be updated and written to disk.MinLogPerBuffer64Minimum log record size in bytesThe value must be either a multiple of the on-disk sector size or a size that fits evenly into the on-disk sector size.MaxLogPerBuffer8192Maximum log record size in bytesThis value cannot exceed 64000. The value must be a multiple of the on-disk sector size.RollbackChance100The chance that an in-memory operation will occur that causes a rollback operation to occur.When this rollback operation occurs, SQL Server does not write to the log file.SleepAfter5Sleep time after each cycle, in millisecondsAuditUser section
The SQLIOSim utility takes the values that you specify in the AuditUser section to simulate DBCC activity to read and to audit the information about the page. Validation occurs even if the value of the UserCount parameter is set to 0.ParameterDefault valueDescriptionCommentsUserCount2Number of Audit threadsThe value cannot exceed the following value: CPUCount1023-100
The total number of all users also cannot exceed this value. A value of 0 means that you cannot create random access users. A value of -1 means that you must use the automatic configuration of the following value: min(CPUCount2, 8)
NOTE A SQL Server system may have thousands of sessions. Most of the sessions do not have active requests. Use the count(*) function in queries against the sys.dm_exec_requests DMV as a baseline for establishing this test parameter value.
CPUCount here refers to the value of the CPUCount parameter in the CONFIG section.
The min(CPUCount*2, 8) value results in the smaller of the values between CPUCount*2 and 8.BuffersValidated64DelayAfterCycles2Apply the AuditDelay parameter after the number of BuffersValidated cycles is completedAuditDelay200Number of milliseconds to wait after each DelayAfterCycles operationMs Sql Ser
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