Progress
Installation and Configuration Guide
Version 9
for Windows
Processes
Progress provides the following optional processes to improve performance:
- Asynchronous Page Writer (APW) — The APW improves database performance by performing overhead operations in the background. These operations provide available buffers, reduce the number of buffers that Progress reads before writing to disk, and reduce the overhead associated with before-image checkpointing (the process of synchronizing the buffer pool of modified blocks to the database).
- Before-image Writer (BIW) — The BIW improves performance by continually writing before-image buffers to disk. These writes occur in the background.
- After-image Writer (AIW) — The AIW improves performance by continually writing AI buffers to disk soon after Progress fills the buffers.
- Progress Watchdog (PROWDOG) — The watchdog process cleans up after improperly terminated processes by releasing locks, backing out any live transactions and releasing shared-memory locks, and disconnecting and cleaning up the server’s remote clients.
See the Progress Database Administration Guide and Reference for more information about managing and improving Progress performance.
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