Use the following query:
select substr(DEST,1,10) DEST, DESCRIPTION from x$messages order by DEST;
DEST DESCRIPTION ---------- ---------------------------------------------------------------- * Monitor Cleanup * KSB action for X-instance calls * generic shutdown background * Scumnt mount lock * database close in progress * Poll system events broadcast channel * svr actn for shrd grp reg/dereg ARB* ASM to slave BG msg ARC* Archiver wakeup ARCH Archiver Message ARCH Archiver shutdown DEST DESCRIPTION ---------- ---------------------------------------------------------------- CJQ* Shutdown Job Queue Process CJQ* Job Queue Interupt CJQ* Job Queue Interupt CJQ* Job Queue Interupt CJQ* Job Queue Timout CJQ0 Check for async messages from other instances CJQ0 Coordinator send broadcast timeout CKPT create/scrub cmon foregrounds CKPT perform RM action in CKPT CKPT identify control file CKPT close control file DEST DESCRIPTION ---------- ---------------------------------------------------------------- CKPT release (XR,4,0) enqueue CKPT CKPT stat update timeout action CKPT CKPT reuse call completion action CKPT CKPT reuse range call continuation CKPT CKPT reuse call continuation CKPT refresh control file CKPT check for parameters from other instances CKPT start background CKPT CPU dynamic reconfiguration CKPT check for quiesce messages CKPT unquiesce the instance during database close DEST DESCRIPTION ---------- ---------------------------------------------------------------- CKPT unsubscribe to quiesce channel CKPT subscribe to quiesce channel CKPT Get Proxy Lock CKPT Db Checkpt Compl check CKPT Db Checkpt Request check CKPT update recovery-based i/o statistics CKPT Compile Environment Monitor CKPT SQL Memory Management Calculation CKPT free PX memory chunks in background CKPT KKX: drop ncomp dll action CKPT Flashback barrier DEST DESCRIPTION ---------- ---------------------------------------------------------------- CKPT hold alert level CKPT recovery area alert action CKPT start change tracking in ckpt CKPT get (XR,4,0) enqueue CKPT sense a heartbeat CKPT set heartbeat sensing CKPT emulate i/o errors on a disk CKPT timeout CKPT Run self test on group CKPT asynchronously dismount disk group CKPT dismount disk group DEST DESCRIPTION ---------- ---------------------------------------------------------------- CKPT query disk group status CKPT check disk status CKPT update disk status CKPT update disk group status CKPT kfc CKPT dismount disk group CKPT kfc CKPT mount disk group CTWR change tracking message CTWR change tracking timeout action DBW* hardware clock went backwards DBW* DBWR write buffers DBW* get/release open thread enqueue DEST DESCRIPTION ---------- ---------------------------------------------------------------- DBW* mount/dismount all db files DBW0 SGA memory tuning parameter update - DBW0 DBW0 Db mount lock DBW0 kfcb Poke DBW0 DBW0 kfc mount disk group DBW0 kfc dismount disk group DBW0 kfc invalidate file extent DBW0 Reserve lock name space lock DBW0 Release lock name space lock DBW0 complete Release space call DBW0 verify/invalidate all db files DEST DESCRIPTION ---------- ---------------------------------------------------------------- DBW0 recovery db file verification DBW0 identify db file DBW0 close and unlock db file DBW0 lock db file DBW0 offline db file DBW0 Db File check DBW0 Message to flush IMU txns DBW0 Db Instance Lock Mgmt DIAG write trace records out DIAG Clusterwise dump request DIAG poradebug commands DEST DESCRIPTION ---------- ---------------------------------------------------------------- DIAG write trace records out DIAG write trace records out DIAG write trace records out DMON DMON Wakeup DMON DMON shutdown DMON DMON Verify Standby shutdown for PM violation DMON Standby site request resync DMON Metadata file available DMON DMON rcv NS status DMON DMON Receive Message DMON DMON Disable DRC DEST DESCRIPTION ---------- ---------------------------------------------------------------- DMON DMON Interrupt Routine INSV INSV Wakeup INSV NetSlave Shutdown Message INSV INSV Receive Message LCK0 ksim LCK0 functions LCK0 ksim reg/dereg instance group LCK0 ksim query instance group LCK0 ksim polling interrupt action LCK0 KSXR remote instance died LCK0 KSXR finialize LCK0 kxfp signal recv function DEST DESCRIPTION ---------- ---------------------------------------------------------------- LCK0 get and hold global enqueue LCK0 perform a user instance lock operation LCK0 SMON purge object number cache LCK0 KQLM interrupt action LCK0 KQLM invalidation instance lock operation LCK0 KQLM pin instance lock operation LCK0 KQR timeout action LCK0 KQR get instance lock LCK0 sequence bckgrnd instance lock LCK0 release TS enq for sort segment LCK0 kea signal recv function DEST DESCRIPTION ---------- ---------------------------------------------------------------- LCK0 get TS enq for sort segment LCK0 release quiesce enqueue LCK0 get quiesce enqueue LCK0 KCL lock affinity timeout action LCK0 Check SCN adjust LCK0 Cross-instance broadcast message LCK0 ksim get value LGWR LGWR failure LGWR kfr ACD relocation LGWR kfr Incr Ckpt LGWR kfr Poke LGWR DEST DESCRIPTION ---------- ---------------------------------------------------------------- LGWR kfr Dismount disk group LGWR kfr mount disk group LGWR LGWR to Start DMON LGWR free KTU instance lock LGWR convert KTU instance lock LGWR get KTU instance lock LGWR dml_locks = 0 global enforcement LGWR Open/close/mount/dismount thread LGWR Redo writer generate offline immed marker LGWR Redo writer log switch operations LGWR LGWR re-eval standby locks DEST DESCRIPTION ---------- ---------------------------------------------------------------- LGWR Redo writer interrupt action LGWR Redo writer IO's LMD* Flush side-channel msgs LMD LNS* Network Server wakeup LNS* Network Server forced LNS* Network Server shutdown LNS* Network Server reinit MMAN lock memory at startup MMAN Memory Management MMAN Handle sga_target resize MMAN Reset advisory pool when advisory turned ON DEST DESCRIPTION ---------- ---------------------------------------------------------------- MMAN Complete deferred initialization of components MMAN lock memory timeout action MMNL tune undo retention MMNL MMNL Periodic MQL Selector MMNL ASH Sampler (KEWA) MMNL MMON SWRF Raw Metrics Capture MMON reload failed KSPD callbacks MMON SGA memory tuning MMON background recovery area alert action MMON Flashback Marker MMON tablespace alert monitor DEST DESCRIPTION ---------- ---------------------------------------------------------------- MMON UNDO MMON ACTION MMON MMON Local action Listener MMON MMON Remote action Listener MMON Advisor delete expired tasks MMON ASH Emergency Flusher (KEWA) MMON MMON SWRF Auto DBFUS Task MMON MMON SWRF Auto Purge Task MMON MMON SWRF Auto Flush Task MMON alert message purge MMON alert message cleanup MMON Check for sync messages from other instances DEST DESCRIPTION ---------- ---------------------------------------------------------------- MMON ADDM (KEH) MMON threshold reconciliation MMON metrics monitoring MMON shutdown MMON MMON run-once action driver MMON MMON testing slave MMON MMON testing action MMON MMON Completion Callback Dispatcher MMON Job Autostart action force MMON Coordinator autostart timeout MMON Check for autostart messages from other instances DEST DESCRIPTION ---------- ---------------------------------------------------------------- MMON Compute cache stats in background MMON undo usage MMON recovery area alert action MMON SGA memory tuning parameter update MMON reconfiguration MMON action NSV* NetSlave Wakeup Message NSV* NetSlave Receive Message NSV* NetSlave Metadata Resync NSV* NetSlave Health Check Message NSV* NetSlave Shutdown Message NSV* NetSlave request Primary to resync DEST DESCRIPTION ---------- ---------------------------------------------------------------- NSV* NetSlave Check DRC version QMNC Shutdown Q Monitor Coord RBAL ASM to master BG msg RBAL BG load lib msg RBAL|SMON OSM to BG mesg RECO distributed recovery wakeup RECO distributed recovery shutdown RSM* RSM Wakeup RSM* RSM Receive Message RSM* RSM Receive Message Response RVWR Open/close flashback thread DEST DESCRIPTION ---------- ---------------------------------------------------------------- RVWR RVWR IO's SMON kfcl instance recovery TEST Reliable Test Dummy Call 212 rows selected. SQL>
Oracle - Internals
Closed
Major
How to see the tasks of Oracle background processes ?
Answer:
Use the following query:
select substr(DEST,1,10) DEST, DESCRIPTION from x$messages order by DEST;