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

Function

This command is used to create secondary indexes in the CarbonData tables.

Syntax

CREATE INDEX index_name

ON TABLE [db_name.]table_name (col_name1, col_name2)

AS 'carbondata'

PROPERTIES ('table_blocksize'='256');

Parameter Description

Table 1 CREATE SECONDARY INDEX parameters

Parameter

Description

index_name

Index table name. It consists of letters, digits, and special characters (_).

db_name

Database name. It consists of letters, digits, and special characters (_).

table_name

Name of the database table. It consists of letters, digits, and special characters (_).

col_name

Name of a column in a table. Multiple columns are supported. It consists of letters, digits, and special characters (_).

table_blocksize

Block size of a data file. For details, see •Block Size.

Precautions

db_name is optional.

Examples

  • CREATE INDEX productNameIndexTable on table productdb.productSalesTable (productName,city) as 'carbondata';

    In this example, a secondary table named productdb.productNameIndexTable is created and index information of the provided column is loaded.

  • CREATE INDEX t1_index1 on table t1 (c7_Datatype_Desc) AS 'carbondata' PROPERTIES('table_blocksize'='256');

System Response

A secondary index table will be created. Index information related to the provided column will be loaded into the secondary index table. The success message will be recorded in system logs.

Parent topic: DML