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MergePartitions command (TMSL)

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Applies to: SQL Server 2016 and later Analysis Services Azure Analysis Services Fabric/Power BI Premium

Merges the data of one or more source partitions into a target partition, and then deletes the source partition. The SQL Query of the target partition will not be updated as part of the merge. To ensure that subsequent processing of the partition retrieves all of the data, you should revise the query so that it selects all of the data in the merged partition.

Request

You must specify the database, table, and source and target partitions. You can only merge partitions from the same table.

{   
  "mergePartitions": {   
    "target": {   
      "database": "salesdatabase",   
      "table": "sales",   
      "partition": "may2015"   
    },   
    "sources": [   
      {   
        "database": "salesdatabase",   
        "table": "Sales",   
        "partition": "partition1"   
      },   
      {   
        "database": "salesdatabase",   
        "table": "Sales",   
        "partition": "partition2"   
      }   
    ]   
  }   
}

Response

Returns an empty result when the command succeeds. Otherwise, an XMLA exception is returned.

Usage (endpoints)

This command element is used in a statement of the Execute Method (XMLA) call over an XMLA endpoint, exposed in the following ways:

  • As an XMLA window in SQL Server Management Studio (SSMS)

  • As an input file to the invoke-ascmd PowerShell cmdlet

  • As an input to an SSIS task or SQL Server Agent job

You can generate a ready-made script for this command from SSMS. For example, you can click the Script in Partition Management dialog box.