PX Deq Credit: send blkd (3)---Script to monitor parallel queries (文档 ID 45
Script to monitor parallel queries (文档 ID 457857.1)
Applies to:
Oracle Server - Enterprise Edition - Version 9.2.0.1 and laterInformation in this document applies to any platform.
***Checked for relevance on 28-April-2010***
Purpose
***Checked for relevance on 10-Oct-2011***
The script has 3 SQL commands. The first 1 gives an overview of all running parallel queries with all slaves.It shows the if a slave is waiting and for what event it waits. The second commands shows for the PX Deq events the processes that are exchange data.The third 1 shows for long running processes what are the slaves do.
Script
col username for a12
col "QC SID" for A6
col "SID" for A6
col "QC/Slave" for A8
col "Req. DOP" for 9999
col "Actual DOP" for 9999
col "Slaveset" for A8
col "Slave INST" for A9
col "QC INST" for A6
set pages 300 lines 300
col wait_event format a30
select
decode(px.qcinst_id,NULL,username,
' - '||lower(substr(pp.SERVER_NAME,
length(pp.SERVER_NAME)-4,4) ) )"Username",
decode(px.qcinst_id,NULL, 'QC', '(Slave)') "QC/Slave" ,
to_char( px.server_set) "SlaveSet",
to_char(s.sid) "SID",
to_char(px.inst_id) "Slave INST",
decode(sw.state,'WAITING', 'WAIT', 'NOT WAIT' ) as STATE,
case sw.state WHEN 'WAITING' THEN substr(sw.event,1,30) ELSE NULL end as wait_event ,
decode(px.qcinst_id, NULL ,to_char(s.sid) ,px.qcsid) "QC SID",
to_char(px.qcinst_id) "QC INST",
px.req_degree "Req. DOP",
px.degree "Actual DOP"
from gv$px_session px,
gv$session s ,
gv$px_process pp,
gv$session_wait sw
where px.sid=s.sid (+)
and px.serial#=s.serial#(+)
and px.inst_id = s.inst_id(+)
and px.sid = pp.sid (+)
and px.serial#=pp.serial#(+)
and sw.sid = s.sid
and sw.inst_id = s.inst_id
order by
decode(px.QCINST_ID, NULL, px.INST_ID, px.QCINST_ID),
px.QCSID,
decode(px.SERVER_GROUP, NULL, 0, px.SERVER_GROUP),
px.SERVER_SET,
px.INST_ID
/
set pages 300 lines 300
col wait_event format a30
select
sw.SID as RCVSID,
decode(pp.server_name,
NULL, 'A QC',
pp.server_name) as RCVR,
sw.inst_id as RCVRINST,
case sw.state WHEN 'WAITING' THEN substr(sw.event,1,30) ELSE NULL end as wait_event ,
decode(bitand(p1, 65535),
65535, 'QC',
'P'||to_char(bitand(p1, 65535),'fm000')) as SNDR,
bitand(p1, 16711680) - 65535 as SNDRINST,
decode(bitand(p1, 65535),
65535, ps.qcsid,
(select
sid
from
gv$px_process
where
server_name = 'P'||to_char(bitand(sw.p1, 65535),'fm000') and
inst_id = bitand(sw.p1, 16711680) - 65535)
) as SNDRSID,
decode(sw.state,'WAITING', 'WAIT', 'NOT WAIT' ) as STATE
from
gv$session_wait sw,
gv$px_process pp,
gv$px_session ps
where
sw.sid = pp.sid (+) and
sw.inst_id = pp.inst_id (+) and
sw.sid = ps.sid (+) and
sw.inst_id = ps.inst_id (+) and
p1text = 'sleeptime/senderid' and
bitand(p1, 268435456) = 268435456
order by
decode(ps.QCINST_ID, NULL, ps.INST_ID, ps.QCINST_ID),
ps.QCSID,
decode(ps.SERVER_GROUP, NULL, 0, ps.SERVER_GROUP),
ps.SERVER_SET,
ps.INST_ID
/
set pages 300 lines 300
col "Username" for a12
col "QC/Slave" for A8
col "Slaveset" for A8
col "Slave INST" for A9
col "QC SID" for A6
col "QC INST" for A6
col "operation_name" for A30
col "target" for A30
select
decode(px.qcinst_id,NULL,username,
' - '||lower(substr(pp.SERVER_NAME,
length(pp.SERVER_NAME)-4,4) ) )"Username",
decode(px.qcinst_id,NULL, 'QC', '(Slave)') "QC/Slave" ,
to_char( px.server_set) "SlaveSet",
to_char(px.inst_id) "Slave INST",
substr(opname,1,30) operation_name,
substr(target,1,30) target,
sofar,
totalwork,
units,
start_time,
timestamp,
decode(px.qcinst_id, NULL ,to_char(s.sid) ,px.qcsid) "QC SID",
to_char(px.qcinst_id) "QC INST"
from gv$px_session px,
gv$px_process pp,
gv$session_longops s
where px.sid=s.sid
and px.serial#=s.serial#
and px.inst_id = s.inst_id
and px.sid = pp.sid (+)
and px.serial#=pp.serial#(+)
order by
decode(px.QCINST_ID, NULL, px.INST_ID, px.QCINST_ID),
px.QCSID,
decode(px.SERVER_GROUP, NULL, 0, px.SERVER_GROUP),
px.SERVER_SET,
px.INST_ID
/
Sample Output
Some sample outputs from the script.
Output from the first script
Username QC/Slave SlaveSet SID Slave INS STATE WAIT_EVENT QC SID QC INS Req. DOP Actual DOP
------------ -------- -------- ------ --------- -------- ------------------------------ ------ ------ -------- ----------
SCOTT QC 923 1 WAIT db file sequential read 923
- p003 (Slave) 1 935 1 WAIT PX Deq Credit: send blkd 923 1 4 4
- p001 (Slave) 1 961 1 WAIT PX Deq: Execution Msg 923 1 4 4
- p002 (Slave) 1 1035 1 WAIT PX Deq: Execution Msg 923 1 4 4
- p004 (Slave) 1 977 1 WAIT PX Deq Credit: send blkd 923 1 4 4
- p006 (Slave) 2 609 1 WAIT PX Deq: Execution Msg 923 1 4 4
- p007 (Slave) 2 642 1 WAIT PX Deq: Execution Msg 923 1 4 4
- p008 (Slave) 2 970 1 WAIT PX Deq: Execution Msg 923 1 4 4
- p005 (Slave) 2 953 1 WAIT PX Deq: Execution Msg 923 1 4 4
SCOTT QC 1003 1 WAIT SQL*Net message from client 1003
- p015 (Slave) 1 608 1 WAIT PX Deq Credit: send blkd 1003 1 8 8
- p011 (Slave) 1 639 1 WAIT PX Deq Credit: send blkd 1003 1 8 8
- p012 (Slave) 1 1115 1 WAIT PX Deq: Execution Msg 1003 1 8 8
- p000 (Slave) 1 1253 1 WAIT PX Deq Credit: send blkd 1003 1 8 8
- p010 (Slave) 1 1420 1 WAIT PX Deq: Execution Msg 1003 1 8 8
- p009 (Slave) 1 1421 1 WAIT PX Deq Credit: send blkd 1003 1 8 8
- p014 (Slave) 1 1417 1 WAIT PX Deq: Execution Msg 1003 1 8 8
- p013 (Slave) 1 1180 1 WAIT PX Deq: Execution Msg 1003 1 8 8
- p020 (Slave) 2 1422 1 WAIT PX Deq: Execution Msg 1003 1 8 8
- p023 (Slave) 2 1423 1 WAIT PX Deq: Execution Msg 1003 1 8 8
- p018 (Slave) 2 1424 1 WAIT PX Deq: Execution Msg 1003 1 8 8
- p021 (Slave) 2 1426 1 WAIT PX Deq: Execution Msg 1003 1 8 8
- p019 (Slave) 2 1428 1 WAIT PX Deq: Execution Msg 1003 1 8 8
- p016 (Slave) 2 1429 1 WAIT PX Deq: Execution Msg 1003 1 8 8
- p022 (Slave) 2 1427 1 WAIT PX Deq: Execution Msg 1003 1 8 8
- p017 (Slave) 2 1425 1 WAIT PX Deq: Execution Msg 1003 1 8 8
This out shows 2 queries. 1 is running with degree 4 and the other with degree 8. Is shows also that all slaves are currently waiting.
The next scrip analyze in more detail the "PX Deq: .." wait events
RCVSID RCVR RCVRINST WAIT_EVENT SNDR SNDRINST SNDRSID STATE
---------- ---- ---------- ------------------------------ ----- ---------- ---------- --------
935 P003 1 PX Deq Credit: send blkd QC 1 923 WAIT
961 P001 1 PX Deq: Execution Msg QC 1 923 WAIT
977 P004 1 PX Deq Credit: send blkd QC 1 923 WAIT
1035 P002 1 PX Deq: Execution Msg QC 1 923 WAIT
609 P006 1 PX Deq: Execution Msg QC 1 923 WAIT
642 P007 1 PX Deq: Execution Msg QC 1 923 WAIT
970 P008 1 PX Deq: Execution Msg QC 1 923 WAIT
953 P005 1 PX Deq: Execution Msg QC 1 923 WAIT
608 P015 1 PX Deq Credit: send blkd QC 1 1003 WAIT
1180 P013 1 PX Deq: Execution Msg QC 1 1003 WAIT
1253 P000 1 PX Deq Credit: send blkd QC 1 1003 WAIT
1417 P014 1 PX Deq: Execution Msg QC 1 1003 WAIT
1421 P009 1 PX Deq Credit: send blkd QC 1 1003 WAIT
1420 P010 1 PX Deq: Execution Msg QC 1 1003 WAIT
1115 P012 1 PX Deq: Execution Msg QC 1 1003 WAIT
639 P011 1 PX Deq Credit: send blkd QC 1 1003 WAIT
1422 P020 1 PX Deq: Execution Msg QC 1 1003 WAIT
1423 P023 1 PX Deq: Execution Msg QC 1 1003 WAIT
1424 P018 1 PX Deq: Execution Msg QC 1 1003 WAIT
1425 P017 1 PX Deq: Execution Msg QC 1 1003 WAIT
1426 P021 1 PX Deq: Execution Msg QC 1 1003 WAIT
1427 P022 1 PX Deq: Execution Msg QC 1 1003 WAIT
1428 P019 1 PX Deq: Execution Msg QC 1 1003 WAIT
1429 P016 1 PX Deq: Execution Msg QC 1 1003 WAIT
Here we see that the slaves are communicating with the Query Coordinator . All this looks fine.
The last one shows what slaves that have an entry in v$session_longops to get an idea what slave or the QC are doing.
Username QC/Slave SlaveSet Slave INS OPERATION_NAME TARGET SOFAR TOTALWORK UNITS START_TIM QC SID QC INS
------------ -------- -------- --------- ------------------------------ ------------------------------ ---------- ---------- -------------------------------- --------- ------ ------
SCOTT QC 1 Index Fast Full Scan EMP 680893 680893 Blocks 10-SEP-07 923
SCOTT QC 1 Index Fast Full Scan EMP 680893 680893 Blocks 10-SEP-07 923
- p003 (Slave) 1 1 Sort Output 21997 33383 Blocks 10-SEP-07 923 1
- p001 (Slave) 1 1 Sort Output 94196 94196 Blocks 10-SEP-07 923 1
- p011 (Slave) 1 1 Hash Join 589 589 Blocks 11