Setting the Retention Period of Multi-Versioning Backup Data (Deprecated, Not Recommended)

Function

The multi-versioning feature is to be deprecated and is not recommended.

After multiversion is enabled, backup data is retained for seven days by default. You can change the retention period by setting system parameter dli.multi.version.retention.days. Multiversion data out of the retention period will be automatically deleted when the insert overwrite or truncate statement is executed. You can also set table attribute dli.multi.version.retention.days to adjust the retention period when adding a column or modifying a partitioned table.

For details about the syntax for enabling or disabling the multiversion function, see Enabling or Disabling Data Multi-Versioning (Deprecated, Not Recommended).

Currently, the multiversion function supports only OBS tables created using the Hive syntax. For details about the syntax for creating a table, see Creating an OBS Table Using the Hive Syntax.

Syntax

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ALTER TABLE [db_name.]table_name 
SET TBLPROPERTIES ("dli.multi.version.retention.days"="days");

Keywords

• TBLPROPERTIES: This keyword is used to add a key/value property to a table.

Parameters

Precautions

Currently, the multiversion function supports only OBS tables created using the Hive syntax. For details about the syntax for creating a table, see Creating an OBS Table Using the Hive Syntax.

Example

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ALTER TABLE test_table 
SET TBLPROPERTIES ("dli.multi.version.retention.days"="5");