Learning Apache Cassandra - Second Edition

Unlogged batches

There is a performance penalty associated with the batchlog as it is written to two other nodes. If you do not want to incur this penalty, run the batch operation without using the batchlog table using the UNLOGGED keyword. So, to execute the earlier batch statement as an unlogged batch, you would have to execute the following command:

BEGIN UNLOGGED BATCH   INSERT INTO "user_status_updates"     ("username", "id", "body")   VALUES(     'dave',     16e2f240-2afa-11e4-8069-5f98e903bf02,     'dave update 4' );    INSERT INTO "home_status_updates" (     "timeline_username",     "status_update_id",     "status_update_username",     "body")   VALUES (     'alice',     16e2f240-2afa-11e4-8069-5f98e903bf02,     'dave',     'dave update 4'   ); APPLY BATCH;

Unlogged batches ...