Space Management Coordinator Process (SMCO)

Keeping Space Optimized 📦

🔍 What is SMCO?

The space management coordinator process (SMCO) schedules and coordinates various space management tasks in the database. It dynamically creates space management worker processes (Wnnn) to perform these tasks.

🛠️ How Does SMCO Work?

  • SMCO spawns worker processes (Wnnn) that act autonomously.
  • After completing a task, workers pick up the next from a queue.
  • Workers terminate themselves if idle for a long time.
  • Worker names: W001, W002, etc.

⚙️ Key Tasks of Wnnn for Space Management

  • Preallocate space in locally managed tablespaces and SecureFiles segments based on growth analysis.
  • Manage temporary tablespace metadata and reclaim space from orphaned temporary segments.
  • Reclaim space from dropped segments.
  • Perform fast ingest deferred inserts.

⚙️ Key Tasks of Wnnn for Oracle Database In-Memory Option

  • Prepopulate and repopulate in-memory enabled objects with varying priority levels (LOW to CRITICAL).
  • Trigger in-memory population and repopulation tasks for the in-memory coordinator (IMCO) foreground processes in response to queries and DMLs.

⚙️ Running Mode

  • Both SMCO and Wnnn worker processes can run as threads or operating system processes.

💡 Why SMCO Matters

  • Proactively manages database space to optimize performance.
  • Supports efficient in-memory data management.
  • Helps reduce manual space maintenance efforts.

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