What is J001 process Oracle?

What is J001 process Oracle?

CQJ0 (Job queue controller): This process periodically checks the job log, if a job is due; it calls the corresponding Jnnn process to run the job. J000, J001 J999 (Job Queue): This process is in charge of all batch processing, it execute all scheduled jobs.

Which Oracle background processes are mandatory and optional?

Not all background processes are mandatory for an instance. Some are mandatory and some are optional. Mandatory background processes are DBWn, LGWR, CKPT, SMON, PMON, and RECO. All other processes are optional, will be invoked if that particular feature is activated.

What is Oracle MMAN process?

MMAN (Memory Manager) is a background process that manages the dynamic resizing of SGA memory areas as the workload increases or decreases. This process was introduced in Oracle 10g.

What is the purpose of Smon background process?

SMON (System MONitor) is an Oracle background process created when you start a database instance. The SMON process performs instance recovery, cleans up after dirty shutdowns and coalesces adjacent free extents into larger free extents. SMON wakes up every 5 minutes to perform housekeeping activities.

How many Lgwr processes are there in Oracle 12c?

one LGWR
While there is always only one LGWR for an Oracle instance, Oracle allows busy DML databases to spawn multiple log writer factotum processes (multiple LGWR slave processes that are owned and governed by the master LGWR).

What is Oracle checkpoint process?

The checkpoint process is responsible for updating file headers in the database datafiles. A checkpoint occurs when Oracle moves new or updated blocks (called dirty blocks) from the RAM buffer cache to the database datafiles.

What is the role of FBDA background process?

Flashback Data Archiver Process (FBDA) is a background process that provides the ability to track and store transactional changes to a table over its lifetime. FBDA is also responsible for automatically managing the flashback data archive for space, organization (partitioning tablespaces), and retention.

How many Lgwr processes are there in Oracle?

While there is always only one LGWR for an Oracle instance, Oracle allows busy DML databases to spawn multiple log writer factotum processes (multiple LGWR slave processes that are owned and governed by the master LGWR).