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Status Planned for future release
Components Q Replication for Z
Created by Guest
Created on Mar 5, 2019

Q-Replication Apply program shall be able to recognize if a column-organized table contains already a dictionary



the current implementation of the Q-Replication apply program for an automatic LOAD operation on column-organized target tables does not recognize if a dictionary already exist.

A column compression dictionary is used to compress data in a column of a column-organized table.

When you load data into a column-organized table, the first phase is the analyze phase, which is unique to column-organized tables.

The analyze phase occurs only if column compression dictionaries must be built, which happens during a LOAD REPLACE operation, a LOAD REPLACE RESETDICTIONARY operation, a LOAD REPLACE RESETDICTIONARYONLY operation, or a LOAD INSERT operation (if the column-organized table is empty). The load utility analyzes the input data to determine the best encoding schemes for building column compression dictionaries.


However an automatic LOAD on column-organized target tables performed by the Q-Replicaton apply program started always the analyze phase and it seems that the apply prgram use the LOAD REPLACE RESETDICTIONARY option for each full refresh.

That doube the time for a new full refresh even if there a dictionary already in place.

The apply program shall be able to recognize if there dictionary in place in order to avoid a new analyze phase.

This option shall be configureable for each subscription, e.g. specify a flag which indicate to to a new LOAD with a LOAD REPLACE RESETDICTIONARY operation.