Oracle9i Database Reference
Release 1 (9.0.1)

Part Number A90190-02
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Oracle Wait Events, 3 of 5


Wait Events and Parameters

The following wait events are present in the Oracle server. The columns P1, P2, and P3 represent parameters for the wait event. Links in the "Event Name" column take you to a more complete description of the wait event. Links in the parameter columns take you to descriptions of some of the more common parameters. Selected parameters and wait events are further described in the sections that follow.

Event Name  P1  P2  P3 

alter system set mts_dispatcher  

waited 

not used 

not used 

batched allocate scn lock request 

not used 

not used 

not used 

BFILE check if exists 

 

 

 

BFILE check if open 

 

 

 

BFILE closure 

 

 

 

BFILE get length 

 

 

 

BFILE get name object 

 

 

 

BFILE get path object 

 

 

 

BFILE internal seek 

 

 

 

BFILE open 

 

 

 

BFILE read 

 

 

 

buffer being modified waits 

 

 

 

buffer busy due to global cache 

file# 

block# 

id 

buffer busy waits 

file# 

block# 

id 

buffer deadlock 

dba 

class*10+mode 

flag 

buffer for checkpoint 

buffer# 

dba 

state*10+mode 

buffer latch 

latch addr  

chain# 

not used 

buffer read retry 

file# 

block# 

not used 

checkpoint completed 

not used 

not used 

not used 

checkpoint range buffer not saved 

not used 

not used 

not used 

Contacting SCN server or SCN lock master 

 

 

 

control file parallel write 

files 

blocks 

requests 

control file sequential read 

file# 

block# 

blocks 

control file single write 

file# 

block# 

blocks 

conversion file read 

file# 

block# 

blocks 

db file parallel read 

files 

blocks 

requests 

db file parallel write 

files 

blocks 

requests 

db file scattered read 

file# 

block# 

blocks 

db file sequential read 

file# 

block# 

blocks 

db file single write 

file# 

block# 

blocks 

debugger command 

not used 

not used 

not used 

DFS db file lock 

file# 

not used 

not used 

DFS lock handle 

type | mode 

id1 

id2 

direct path write 

file number 

first dba 

block cnt 

dispatcher shutdown 

 

 

 

dispatcher timer 

sleep time 

not used 

not used 

DLM generic wait event 

 

 

 

dupl. cluster key 

dba 

not used 

not used 

enqueue 

name | mode 

id1 

id2 

file identify 

fib 

file name 

opcode 

file open 

fib 

iov 

free buffer waits 

file# 

block# 

set-id# 

free global transaction table entry 

tries 

not used 

not used 

free process state object 

not used 

not used 

not used 

global cache bg acks 

 

 

 

global cache cr request 

 

 

 

global cache freelist wait 

lenum 

not used 

not used 

global cache lock busy 

file# 

block# 

lenum 

global cache lock cleanup 

file# 

block# 

lenum 

global cache lock null to s 

file# 

block# 

lenum 

global cache lock null to x 

file# 

block# 

lenum 

global cache lock open null 

file# 

block# 

class 

global cache lock open s 

file# 

block# 

lenum 

global cache lock open x 

file# 

block# 

lenum 

global cache lock s to x 

file# 

block# 

lenum 

global cache multiple locks 

 

 

 

global cache pending ast 

 

 

 

imm op 

msg ptr 

not used 

not used 

inactive session 

session# 

waited 

not used 

inactive transaction branch 

branch# 

waited 

not used 

index block split 

rootdba 

level 

childdba 

instance recovery 

undo segment# 

not used 

not used 

instance state change 

layer 

value 

waited 

IO clients wait for LMON to join GMS group 

 

 

 

io done 

msg ptr 

not used 

not used 

kcl bg acks 

count 

loops 

not used 

kdi: Done Message Dequeue-Coord 

 

 

 

ktpr: Done Message Dequeue-Coord 

 

 

 

latch activity 

address 

number 

process# 

latch free 

address 

number 

tries 

library cache load lock 

object address  

lock address 

10*mask+ namespace 

library cache lock 

handle address 

lock address  

10*mode+ namespace 

library cache pin 

handle address  

pin address  

10*mode+ namespace 

LMON wait for LMD to inherit communication channels 

 

 

 

local write wait 

 

 

 

lock manager wait for dlmd to shutdown 

 

 

 

lock manager wait for remote message 

waittime 

not used 

not used 

log buffer space 

not used 

not used 

not used 

log file parallel write 

files 

blocks 

requests 

log file sequential read 

log# 

block# 

blocks 

log file single write 

log# 

block# 

blocks 

log file switch (archiving needed) 

not used 

not used 

not used 

log file switch (checkpoint incomplete 

not used 

not used 

not used 

log file switch (clearing log file) 

not used 

not used 

not used 

log file switch completion 

not used 

not used 

not used 

log file sync 

buffer# 

not used 

not used 

log switch/archive 

thread# 

not used 

not used 

name-service call wait 

 

 

 

Null event 

 

 

 

on-going SCN fetch to complete 

not used 

not used 

not used 

PAR RECOV: Dequeue msg-Slave 

 

 

 

PAR RECOV: Wait for reply-Query Coord 

 

 

 

parallel execution create server 

nservers 

sleeptime 

enqueue 

parallel execution dequeue wait 

reason 

sleeptime/senderid 

passes 

Parallel Execution Idle Wait-Slaves wait event 

 

 

 

parallel execution qref latch 

function 

sleeptime 

qref 

parallel execution server shutdown 

nalive 

sleeptime 

loop 

parallel execution signal server 

serial 

error 

nbusy 

pending global transaction(s) 

scans 

not used 

not used 

pipe get 

handle address  

buffer length 

timeout 

pipe put 

handle address  

record length 

timeout 

PL/SQL lock timer 

duration 

not used 

not used 

pmon rdomain attach 

 

 

 

pmon timer 

duration 

not used 

not used 

process startup 

type 

process# 

waited 

queue messages 

queue id 

process# 

wait time 

rdbms ipc message 

timeout 

not used 

not used 

rdbms ipc message block 

not used 

not used 

not used 

rdbms ipc reply 

from_process  

timeout 

not used 

redo wait 

not used  

not used 

not used 

refresh controlfile command 

 

 

 

reliable message 

 

 

 

Replication Dequeue 

 

 

 

retry contact SCN lock master 

 

 

 

row cache lock 

cache id 

mode 

request 

scginq AST call 

not used 

not used 

not used 

secondary event 

 

 

 

single-task message 

not used 

not used 

not used 

slave exit 

nalive 

sleeptime 

loop 

slave wait 

 

 

 

smon timer 

sleep time 

failed 

not used 

sort segment request 

 

 

 

SQL*Net break/reset to client 

driver id 

break? 

not used 

SQL*Net break/reset to dblink 

driver id 

break? 

not used 

SQL*Net message from client 

driver id 

#bytes 

not used 

SQL*Net message from dblink 

driver id 

#bytes 

not used 

SQL*Net message to client 

driver id 

#bytes 

not used 

SQL*Net message to dblink 

driver id 

#bytes 

not used 

SQL*Net more data from client 

driver id 

#bytes 

not used 

SQL*Net more data from dblink 

driver id 

#bytes 

not used 

SQL*Net more data to client 

driver id 

#bytes 

not used 

SQL*Net more data to dblink 

driver id 

#bytes 

not used 

switch logfile command 

not used 

not used 

not used 

Test if message present 

 

 

 

timer in sksawat 

not used 

not used 

not used 

trace continue 

 

 

 

trace unfreeze 

 

 

 

trace writer flush 

 

 

 

trace writer I/O 

 

 

 

transaction 

undo seg#| slot# 

wrap# 

count 

unbound tx 

not used 

not used 

not used 

undo segment extension 

segment# 

not used 

not used 

undo segment recovery 

segment# 

tx flags 

not used 

undo segment tx slot 

segment# 

not used 

not used 

virtual circuit status 

circuit# 

status 

not used 

Wait for a parallel reco to abort 

 

 

 

Wait for a undo record 

 

 

 

wait for checking DLM domain 

 

 

 

Wait for credit-free buffer 

 

 

 

Wait for credit-need buffer to send 

 

 

 

Wait for credit-send blocked 

 

 

 

wait for DLM 

 

 

 

wait for DLM latch 

latchtype 

gets 

immediate 

wait for DLM process allocation 

 

 

 

wait for DLM reconfiguration to complete 

 

 

 

wait for gms de-registration 

 

 

 

wait for gms registration 

 

 

 

wait for influx DLM latch 

latchtype 

latchaddr 

not used 

wait for lmd and pmon to attach DLM 

 

 

 

wait for lock db to become frozen 

 

 

 

wait for lock db to unfreeze 

 

 

 

wait for ownership of group-owned lock 

 

 

 

wait for pmon to exit 

 

 

 

wait for reconfiguration to start 

 

 

 

wait for recovery domain attach 

 

 

 

wait for recovery domain latch in kjpr 

 

 

 

wait for recovery validate to complete 

 

 

 

wait for register recovery to complete 

 

 

 

wait for send buffers to send DLM message 

 

 

 

Wait for slaves to ACK-Query Coord 

 

 

 

Wait for slaves to join-Query Coord 

 

 

 

Wait for stopper event to be increased 

 

 

 

wait for tickets to send DLM message 

 

 

 

wait to run in thread run 

 

 

 

waiting in scheduler enter 

 

 

 

waiting in scheduler enter2 

 

 

 

waiting in scheduler shutdown 

 

 

 

waiting in scheduler system stop 

 

 

 

waiting in thread check 

 

 

 

waiting in thread check2 

 

 

 

waiting in thread end wait 

 

 

 

waiting in thread run (queued) 

 

 

 

WMON goes to sleep 

not used 

not used 

not used 

write complete waits 

file# 

block# 

id 

writes stopped by instance recovery or database suspension 

by thread # 

our thread# 

not used 


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