Dbspace logging

The database server uses the following logging process for operations that involve data stored in dbspaces:
  1. Reads the data page from disk to the shared-memory page buffer
  2. Copies the unchanged page to the physical-log buffer, if required
  3. Writes the new data to the page buffer and creates a logical-log record of the transaction, if required
  4. Flushes the physical-log buffer to the physical log on disk
  5. Flushes the logical-log buffer to a logical-log file on disk
  6. Flushes the page buffer and writes it back to disk

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