Author: mfadmin

When does the DBWn actually write to disk?,”The DBWn process writes dirty buffers to disk under the following conditions:• When a server process cannot find a clean reusable buffer after scanning a threshold number of buffers, it signals DBWn to write. DBWn writes dirty buffers to disk asynchronously while performing other processing.• DBWn writes buffers to advance the checkpoint, which is the position in the redo thread (log) from which instance recovery begins. This log position is determined by the oldest dirty buffer in the buffer cache.In all cases

Database

Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.When does the DBWn actually[…]

Read more

Describe the PMON,”Process Monitor ProcessPerforms process recovery when a user process fails- Cleans up the database buffer cache- Frees resources that are used by the user process• Monitors sessions for idle session timeoutcleaning up the database buffer cache and freeing resources that the user process was using. For example, it resets the status of the active transaction table, releases locks, and removes the process ID from the list of active processes.PMON periodically checks the status of dispatcher and server processes, and restarts any that have stopped running (but not any that Oracle Database has terminated intentionally).Like SMON

Database

Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.Describe the PMON,”Process Monitor ProcessPerforms[…]

Read more