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Sergio Govoni
2024-05-23 15:08:53 +02:00
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samples/manage/polybase/external-table/README.md
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@@ -9,7 +9,7 @@ This sample describes an option to update statistics on SQL Server PolyBase exte
In the process of configuring a maintenance plan for a SQL Server database with external tables and external data sources for PolyBase queries, an error occurred during the update statistics task.
## Problem Encountered
## Problem encountered
While attempting to update statistics on an external table, the following error message was encountered:
@@ -60,11 +60,11 @@ Upon investigation, it became apparent that SQL Server does not support the dire
## Resolution steps
### Understanding the Limitation
### Understanding the limitation
Referring to the documentation page, it explicitly states, "Updating statistics is not supported on external tables. To update statistics on an external table, drop and re-create the statistics."
### Available Solutions
### Available solutions
* Option 1: Ignore External Tables:
* This option is not feasible for maintenance plans managed by SQL Server Management Studio, necessitating third-party solutions.
@@ -72,7 +72,7 @@ Referring to the documentation page, it explicitly states, "Updating statistics
* Option 2: Drop and Recreate Statistics:
* Employ a stored procedure, `sp_drop_create_stats_external_table`, to generate T-SQL statements for dropping and creating statistics on external tables. This procedure supports statistics on multiple columns.
### Implementation Guide
### Implementation guide
- Execute `sp_drop_create_stats_external_table` to generate T-SQL statements
- Execute DROP STATISTICS statements before the maintenance statistics task
@@ -103,7 +103,11 @@ This code sample is provided for demonstration and educational purposes only. It
<a name=related-links></a>
## Related Links
## Related links
<!-- Links to more articles. Remember to delete "en-us" from the link path. -->
For more information, see these articles...
For more information, see these articles:
- [Data virtualization with PolyBase in SQL Server](https://learn.microsoft.com/sql/relational-databases/polybase/polybase-guide?WT.mc_id=DP-MVP-4029181)
- [UPDATE STATISTICS (Transact-SQL)](https://learn.microsoft.com/sql/t-sql/statements/update-statistics-transact-sql?WT.mc_id=DP-MVP-4029181)
- [External tables: Why create statistics?](https://learn.microsoft.com/answers/questions/978155/external-tables-why-create-statistics?WT.mc_id=DP-MVP-4029181)