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As mentioned in the error message, some Index Allocation Map(IAM) process is using your tempdb pages which SQL Server can't move as part of your tempdb Shrink file request. So, you have 2 options, either to wait for those process to complete and perform Shrink tempdb during idle hours as suggested above or Restart SQL Server service to get the file size shrunk out..
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As mentioned in the error message, some Index Allocation Map(IAM) process is using your tempdb pages which SQL Server can't move as part of your tempdb Shrink file request. So, you have 2 options, either to wait for those process to complete and perform Shrink tempdb during idle hours as suggested above or Restart SQL Server service to get the file size shrunk out..

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Its been &nbsp;from Long time I am getting this msg. <br />
Is there any alternative way other Restart of SQL services
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Its been  from Long time I am getting this msg.
Is there any alternative way other Restart of SQL services

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Initiating auto close as we haven't heard back from Author and solution was proposed..
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Initiating auto close as we haven't heard back from Author and solution was proposed..

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When trying to Shrink TempDB on one of the Production DB server getting below error msg.<br />
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<b>Could not cleanup worktable IAM chains to allow shrink or remove file operation. Please try again when tempdb is idle.</b>
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When trying to Shrink TempDB on one of the Production DB server getting below error msg.

Could not cleanup worktable IAM chains to allow shrink or remove file operation. Please try again when tempdb is idle.

Shrinking Temp DB

Microsoft SQL Server 2008 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. Major improvements include the  Always On technologies and support for unstructured data types.

Microsoft SQL Server 2008

SQL (Structured Query Language) is designed to be used in conjunction with relational database products as of a means of working with sets of data. SQL consists of data definition, data manipulation, and procedural elements. Its scope includes data insert, query, update and delete, schema creation and modification, and data access control.

Databases are organized collections of data, most commonly accessed through management systems including schemas, tables, queries and processes that allow users to enter and manipulate the information or utilize it in other fashions, such as with web applications or for reporting purposes.

Databases

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

Microsoft SQL Server 2005 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. It includes support for managing XML data and allows a database server to be exposed over web services using Tabular Data Stream (TDS) packets encapsulated within SOAP (protocol) requests.