IMPORT_STATISTICS

Imports statistics from the XML file that was generated by EXPORT_STATISTICS. Imported statistics override existing statistics for the projections that are referenced in the XML file.

Syntax

IMPORT_STATISTICS ( 'filename' )

Parameters

filename

The path and name of an XML input file that was generated by EXPORT_STATISTICS.

Privileges

Superuser

Restrictions

  • IMPORT_STATISTICS imports only valid statistics. If the source XML file has invalid statistics for a specific column, those statistics are not imported and Vertica throws a warning. If the statistics file has an invalid structure, the import operation fails. To check a statistics file for validity, run VALIDATE_STATISTICS.
  • IMPORT_STATISTICS returns warnings for LONG data type columns, as the source XML file generated by EXPORT_STATISTICS contains no statistics for columns of that type.

Example

Import the statistics for the VMart database from an XML file previously created by EXPORT_STATISTICS:

=> SELECT IMPORT_STATISTICS('/opt/vertica/examples/VMart_Schema/vmart_stats.xml');
                     IMPORT_STATISTICS
----------------------------------------------------------------------------
Importing statistics for projection date_dimension_super column date_key failure (stats did not contain row counts)
Importing statistics for projection date_dimension_super column date failure (stats did not contain row counts)
Importing statistics for projection date_dimension_super column full_date_description failure (stats did not contain row counts)
...
(1 row)

See Also