# Parallel DSA & Stats (The Shared Brain) When the Elephant uses **Parallelism**, he must coordinate shared memory areas (DSA) and status tracking. ![[LogicalRepLauncherDSA]] ![[LogicalRepLauncherHash]] ![[ParallelAppend]] ![[ParallelHashJoin]] ![[ParallelQueryDSA]] ![[PerSessionDSA]] ![[PerSessionRecordType]] ![[PerSessionRecordTypmod]] ![[PgStatsData]] ![[PgStatsDSA]] ![[PgStatsHash]]