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3.3
REFRESH¶
Refresh one or more tables explicitly.
Table of Contents
Description¶
The REFRESH TABLE command refreshes one or more tables and all its rows, making all changes made to that table available to all further commands.
The PARTITION clause can be used to only refresh specific partitions of a
partitioned table. All columns by which a table is partitioned are required.
In case the PARTITION clause is omitted all open partitions will be
refreshed. Closed partitions are not refreshed.
For performance reasons refreshing all open partitions should be avoided if possible.
See Partitioned Tables for more information on partitioned tables.
Without issuing this statement there is no guarantee that a change (UPDATE,
DELETE, COPY or INSERT) will be seen by an immediately following
SELECT statement for the row(s) affected by this change. By default a
refresh is scheduled periodically.
Internally a refresh opens a new table reader, which is then used by all subsequent searches on the affected table.
For further details see Refresh. For changing the refresh interval see refresh_interval.
Parameters¶
- table_ident
The name (optionally schema-qualified) of an existing table that is to be refreshed.
- partition_column
Column name by which the table is partitioned.
Clauses¶
PARTITION¶
[ PARTITION ( partition_column = value [ , ... ] ) ]
- partition_column
The name of the column by which the table is partitioned.
All partition columns that were part of the PARTITIONED BY of the CREATE TABLE statement must be specified.
- value
The columns value.