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События ожидания говорят о работе процессов в базе данных. Анализируя события ожиданий можно определить узкие места в работе базы, определить параметры требующие тюнинга.

batched allocate scn lock request

BFILE check if exists

BFILE check if open

BFILE closure

BFILE get length

BFILE get name object

BFILE get path object

BFILE internal seek

broadcast mesg queue transition

broadcast mesg recovery queue transition

buffer busy waits

buffer deadlock

buffer for checkpoint

buffer read retry

checkpoint completed

cleanup of aborted processes

control file parallel write

control file sequential read

control file single write

cursor: mutex S

cursor: mutex X

cursor: pin S

cursor: pin S wait on X

cursor: pin X

Data Guard: process clean up

Data Guard: process exit

Data Guard Broker: single instance

db file parallel read

db file parallel write

db file scattered read

db file sequential read

db file single write

DFS db file lock

DFS lock handle

direct path read

direct path sync

direct path write

Disk file operations I/O

dispatcher shutdown

dispatcher timer

duplicate cluster key

enq: OW – initialization

enq: OW – termination

flashback buf free by RVWR

flashback logfile sync

free buffer waits

free global transaction table entry

free process state object

gc recovery quiesce

GCS lock open S

GCS lock open X

gcs remastering wait for drop pkey

global cache busy

global cache lock cleanup

global cache freelist

inactive session

inactive transaction branch

index block split

instance state change

ksxr wait for mount shared

ktm: instance recovery

latch activity

latch: cache buffers chains

library cache load lock

library cache lock

library cache pin

library cache shutdown

LMON global data update

lock manager wait for remote message

Log archive I/O

log buffer space

log file parallel write

log file sequential read

log file single write

log file switch (archiving needed)

log file switch (checkpoint incomplete)

log file switch (clearing log file)

log file switch (private strand flush incomplete)

log file switch completion

log file sync

log switch/archive

optimizer stats update retry

parallel recovery change buffer free

parallel recovery control message reply

parallel recovery coord send blocked

parallel recovery coord wait for reply

parallel recovery coordinator waits for slave cleanup

parallel recovery read buffer free

parallel recovery slave next change

pending global transaction(s)

PL/SQL lock timer

prewarm transfer retry

prior process spawner to be cleaned up

process startup

PX Deque wait

PX qref latch

PX server shutdown

PX signal server

rdbms ipc message

rdbms ipc message block

rdbms ipc reply

read by other session

recovery read

resmgr: become active

resmgr: cpu quantum

resmgr: pq queued

rolling migration: cluster quiesce

row cache lock

RVWR wait for flashback copy

scginq AST call

SGA: allocation forcing component growth

SGA: MMAN sleep for component shrink

SGA: sga_target resize

Shared IO Pool Memory

single-task message

shared server idle wait

SQL*Net break/reset to client

SQL*Net break/reset to dblink

SQL*Net message from client

SQL*Net message from dblink

SQL*Net message to client

SQL*Net message to dblink

SQL*Net more data from client

SQL*Net more data from dblink

SQL*Net more data to client

SQL*Net more data to dblink

Streams AQ: waiting for messages in the queue

switch logfile command

TCP Socket (KGAS)

timer in sksawat

undo_retention publish retry

undo segment extension

undo segment recovery

undo segment tx slot

virtual circuit status

virtual circuit wait

WCR: replay client notify

WCR: replay clock

WCR: replay lock order

WCR: replay paused

WCR: Sync context busy

WMON goes to sleep

write complete waits

writes stopped by instance recovery or database suspension

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