Help Center/ MapReduce Service/ Component Operation Guide (LTS) (Paris Region)/ Using CarbonData/ CarbonData Syntax Reference/ DDL/ REFRESH INDEX
Updated on 2022-12-14 GMT+08:00
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REFRESH INDEX

Function

This command is used to merge all segments for data files in the secondary index table.

Syntax

  • REFRESH INDEX indextable_name ON TABLE maintable_name

    This command is used to merge all segments for which data files are to be merged.

  • REFRESH INDEX indextable_name ON TABLE maintable_name WHERE SEGMENT.ID IN (0,1,2..N)

    This command is used to merge a batch of specified segments.

Parameter Description

Table 1 REFRESH INDEX parameters

Parameter

Description

indextable_name

Name of an index table

maintable_name

Name of the primary table

Precautions

To clear the data file of compacted segments, run the CLEAN FILES command on the secondary index table.

Examples

REFRESH INDEX productNameIndexTable;

System Response

After this command is executed, the number of data files in the secondary index table will be reduced.

Parent topic: DDL