Transcript db2pd in a Nutshell

Platform: DB2 for Linux, UNIX, and Windows
db2pd in a Nutshell
Phil Gunning
Principal Consultant,
Gunning Technology Solutions, LLC
Session: D04
25 October 2005
0830 – 0930
db2pd Background
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Developed based on OnStat utility from Informix
Problem determination and monitoring tool
Integrated into DB2 V8.2 (Stinger)
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Does not yet contain all options from OnStat
Documented in the Command Reference
Low monitoring overhead (latch free), preferred where
possible over snapshots or event monitors
Command line driven which makes it excellent for use with
scripts
Not dependent on monitor switches
2
db2pd Background
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db2pd returns information without acquiring any
locks or use of DB2 engine resources
Since no locks are obtained, data returned by dbp2d may not
be completely current or accurate
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Zero use of database engine resources however is a good trade-off
It is important to become familiar with db2pd as there is
much information provided by db2pd that cannot be
obtained through snapshot or event monitoring
db2pd contains 34 options
We will cover these new monitoring and problem
determination information elements in this presentation
3
Using db2pd
• Command line tool
• Requires SYSADM authority and on UNIX/Linux must be
instance owner
• No required connection or instance attachment
• For database level information to be retrieved, database must
be active
• Standard options are:
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-c command, read commands from input file
-r repeat, num sec count
-i interactive
-file, specifies output file
4
db2pd Option Categories
• db2pd options can be divided into three categories in
terms of information provided
• Administrative/Status
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OS Info
DBM and DB Configuration Information
DB2 and OS Version, virtual and physical memory
• Monitoring and Tuning
• Problem Determination/Troubleshooting
5
-osinfo option
• db2pd –osinfo
Operating System Information:
OSName: WIN32_NT
NodeName: GTSLT1
Version: 5.1
Release: Service Pack 2
Machine: x86 Family 6, model 10, stepping 0
CPU Information:
TotalCPU OnlineCPU ConfigCPU Speed(MHz) HMTDegree Cores/Socket
1
1
1
1856
1
1
Physical Memory and Swap (Megabytes):
TotalMem FreeMem AvailMem TotalSwap FreeSwap
703
326
326
1016
1159
Virtual Memory (Megabytes):
Total
Reserved Available Free
1719
n/a
n/a
1485
6
Instance and Database Scope
• db2pd options are further broken down by Instance
and Database scope
• Instance scope options return information at the
Instance level
• -agents, -fcm, -mempools, -memsets, -dbmcfg, -sysplex
-utilities
7
Database Scope Options
1. –storagepaths
2. –transactions *
• Returns detailed information on transactions
3. –locks*
• Returns detailed lock information
4. –tablespaces*
• Returns detailed tablespace information
5. –dynamic*
• Returns detailed information about dynamic SQL
6. –static
• Returns information about static SQL
8
Database Scope Options
7. –mempools
• Returns information about memory pools
8. –memsets
• Returns information about memory sets
9. -catalogcache
• Returns detailed information about catalog table activity
10. –tcbstats*
• Returns detailed information about tables and indexes
11. –activestatements*
9
Database Scope Options
12. –applications*
13. –bufferpools
14. -logs
15. –hadr
16. – reorgs
17. -reopts
18. –recovery
19. –dbcfg*
20. –dbmcfg*
10
-inst option
• Returns all instance-scope information
• db2pd -inst
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Version, level, bitness, fixpak information
Operating System Information
CPU Information, including hardware multithreading
Physical Memory, Swap and Virtual Memory Configuration and usage
Agent Information – Idle, Active, Coordinator
Memory Pool information – Actual physical size, upper bound, high water
mark
• Memory Set Summary
• Database Manager Configuration Settings – In memory and on disk
• Utility status and progress
11
-dbmcfg option
• Command: db2pd –dbmcfg file=/tmp/dbmcfg.txt
Database Partition 0 -- Active -- Up 0 days 18:36:03
Database Manager Configuration Settings:
Description
Memory Value
Disk Value
RELEASE
0xa00
0xa00
CPUSPEED
1.141499e-006
1.141499e-006
COMM_BANDWIDTH 1.000000e+002
1.000000e+002
NUMDB
8
8
DATALINKS
NO
NO
12
-dbcfg option
• Command: db2pd –db GTSTST3 –dbcfg
• Returns Database Configuration information
• DB CFG parameter settings in memory and on disk
13
-database option
• Command: >db2pd -db sample -file c:\dbase.txt
Sending all options output to c:\dbase.txt
• Returns database information
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Automatic storage status
Storage path information
HADR status
Table and index activity
• Active table scans
• Index splits
• Active statement list
• Without options specified, runs all database scope options
• -alldbs runs all options for all databases
14
-database Example
C:>db2pd -db sample -file c:\dbase.txt
Sending all options output to c:\dbase.txt
Database Partition 0 -- Database SAMPLE -- Active -- Up 0 days 00:42:21
Applications:
Address AppHandl [nod-index] NumAgents CoorTid Status
C-AnchID C-StmtUID L-AnchID L-StmtUID Appid
0x003FBEA0 448 [000-00448] 1
5376
ConnectCompleted
0
0
0
0
*LOCAL.DB2.050901015508
Database Partition 0 -- Database SAMPLE -- Active -- Up 0 days 00:42:21
Transactions:
Address AppHandl [nod-index] TranHdl Locks
State Tflag
Tflag2 Firstlsn
Lastlsn
LogSpace
SpaceReserved TID
AxRegCnt
GXID
0x04531580 448 [000-00448] 2
0
READ 0x00000000 0x00000000 0x000000000000 0x000000000000 0
0
0x000000000BFE 1
0
Database Partition 0 -- Database SAMPLE -- Active -- Up 0 days 00:42:21
BufferPools:
First Active Pool ID
1
Max Bufferpool ID
1
Max Bufferpool ID on Disk 1
Num Bufferpools
5
Address Id
Name
PageSz PA-NumPgs BA-NumPgs BlkSize ES NumTbsp
PgsLeft
CurrentSz
PostAlter
SuspndTSCt
0x0448C980 1
IBMDEFAULTBP
4096
250
0
0
N 4
0
250
250
0
0x04483D60 4096
IBMHIDDENBP4K 4096
16
0
0
N 0
0
16
16
0
0x0448C200 4097
IBMHIDDENBP8K 8192
16
0
0
N 0
0
16
16
0
0x0448C480 4098
IBMHIDDENBP16K 16384 16
0
0
N 0
0
16
16
0
15
-transactions option
•
Command: db2pd –db db2mon –trans
Database Partition 0 -- Database DB2MON -- Active -- Up 1 days 04:27:09
Transactions:
Address AppHandl [nod-index] TranHdl Locks State Tflag Tflag2 Firstlsn
Lastlsn
LogSpace
SpaceReserved TID
AxRegCnt GXID
0x027D1000 599 [000-00599] 99
0
READ 0x00000000 0x00000000
0x000000000000 0x000000000000 0
0
0x000000009016 1
0
0x027D1A80 591 [000-00591] 100
0
READ 0x00000000 0x00000000
0x000000000000 0x000000000000 0
0
0x000000008FF6 1
0
0x027D2500 589 [000-00589] 101
0
READ 0x00000000 0x00000000
0x000000000000 0x000000000000 0
0
0x000000008FFD 1
0
0x027D2F80 588 [000-00588] 102
0
READ 0x00000000 0x00000000
0x000000000000 0x000000000000 0
0
0x000000009012 1
0
0x027D3A00 9
[000-00009] 103
2
READ 0x00000000 0x00000000
0x000000000000 0x000000000000 0
0
0x0000000003FA 1
0
0x027D4480 8
[000-00008] 104
0
READ 0x00000000 0x00000000 0x000000000000
0x000000000000 0
0
0x000000009014 1
0
16
-locks option
•
Command: db2pd –db db2mon –locks
Database Partition 0 -- Database DB2MON -- Active -- Up 1 days 04:44:50
Locks:
Address
TranHdl Lockname
Type
Mode Sts Owner
0x032DE790 103 4442324143434553BBCB10EC41 Internal P ..S G 103
0x032DE740 103 53514C4445464C5428DD630641 Internal P ..S G 103
Dur HldCnt Att
ReleaseFlg
1
0
0x0000 0x40000000
1
0
0x0000 0x40000000
Snippet from previous –trans output:
0x027D3A00 9
[000-00009] 103
0
0x0000000003FA 1
0x027D4480 8
[000-00008] 104
0
0x000000009014 1
2
0
0
0
READ
0x00000000 0x00000000 0x000000000000 0x000000000000 0
READ
0x00000000 0x00000000 0x000000000000 0x000000000000 0
17
Resolving Lock Contention with db2pd
Database Partition 0 -- Database SAMPLE -- Active -- Up 0
days 16:39:33
db2pd –db GTSTST1 –locks –file /tmp/lockc.txt
Locks:
Address
TranHdl Lockname
0x0459C510 2
53514C4332453036BD4A32C841
0x0459CA10 3
53514C4332453036BD4A32C841
0x0459CA60 3
010000000100000001007B0056
0x0459C9E8 3
53514C4445464C5428DD630641
0x0459EF90 2
02000300270000000000000052
0x0459CAB0 3
02000300270000000000000052
0x0459C8F8 2
02000300000000000000000054
Type
Internal P
Internal P
Internal V
Internal P
Row
Row
Table
0x0459CA88
Table
TranHdl 2 has
an X lock on
this row
3
02000300000000000000000054
Mode Sts Owner Dur HldCnt
.. S
G
2
1
0
.. S
G
3
1
0
.S
G
3
1
0
.S
G
3
1
0
.X
G 2
1
0
.NS W 2
1
0
.IX
G 2
1
0
.IS
G
3
1
0
Att
0x0 000
0x00 00
0x0000
0x0 000
0x0008
0x0 000
0x0000
ReleaseFlg
0x40000000
0x40000000
0x40000000
0x40000000
0x40000002
0x00000001
0x40000002
0x0000
0x00000001
TranHdl 3 is
waiting on a
lock held by
TranHdl 2
Type of lock
Lock mode
18
-locks showlocks option
Locks:
Address TranHdl Lockname
Type
Mode Sts Owner
Dur HldCnt Att ReleaseFlg
0x0459C510 2
53514C4332453036BD4A32C841 Internal P ..S G 2
1 0 0x0000
0x40000000
Pkg UniqueID 434c5153 36304532 Name c8324abd Loading = 0
0x0459CA10 3
53514C4332453036BD4A32C841 Internal P ..S G 3
1 0 0x0000
0x40000000
Pkg UniqueID 434c5153 36304532 Name c8324abd Loading = 0
0x0459CA60 3
010000000100000001007B0056 Internal V ..S G 3
1 0 0x0000 0x40000000
Anchor 123 Stmt 1 Env 1 Var 1 Loading 0
0x0459C9E8 3
53514C4445464C5428DD630641 Internal P ..S G 3
1 0 0x0000
0x40000000
Pkg UniqueID 444c5153 544c4645 Name 0663dd28 Loading = 0
0x0459EF90 2
02000300270000000000000052 Row
..X G 2
1 0 0x0008 0x40000002
TbspaceID 2 TableID 3 RecordID 0x27
0x0459CAB0 3
02000300270000000000000052 Row
.NS W 2
1 0 0x0000 0x00000001
TbspaceID 2 TableID 3 RecordID 0x27
0x0459C8F8 2
02000300000000000000000054 Table .IX G 2
1 0 0x0000 0x40000002
TbspaceID 2 TableID 3
0x0459CA88 3
02000300000000000000000054 Table
.IS G 3
1 0 0x0000 0x00000001
TbspaceID 2 TableID 3
19
-applications option
• Command: db2pd –db db2mon –applications
Applications:
Address AppHandl [nod-index] NumAgents CoorTid Status
L-AnchID L-StmtUID Appid
0x02B9B120 1086 [000-01086] 1
3148
UOW-Waiting
*LOCAL.DB2.050901041938
0x01B686D0 599
[000-00599] 1
1664
UOW-Waiting
*LOCAL.DB2.050901022803
0x0196FB80 591 [000-00591] 1
1984
UOW-Waiting
*LOCAL.DB2.050901022720
0x003FBF30 589 [000-00589] 1
2928
UOW-Waiting
*LOCAL.DB2.050901022718
0x01B6BD70 588
[000-00588] 1
2520
UOW-Waiting
*LOCAL.DB2.050901022717
0x003FB490 9
[000-00009] 1
2172
UOW-Waiting
*LOCAL.DB2.050830232506
0x0196F520 8
[000-00008] 1
2244
UOW-Waiting
*LOCAL.DB2.050830232351
20
C-AnchID C-StmtUID
0
0
79
180
0
0
84
216
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-tcbstats option
• Contains over 21 output data elements that report on
previously unavailable table, index, and table space
information
• One of the most important db2pd options
• Command: db2pd –db db2mon -tcbstats
21
-tcbstats Example
TbspaceID TableID TableNameScans UDI DataSize IndexSize PgReorgs NoChgUpdtsReads FscrUpdatesInserts Updates Deletes
0
1 SYSBOOT
1
0
1
0
0
0
0
0
0
0
0
2 SYSTABLES 54 499
51
24
0
0
3819
2
17
15
0
3 SYSCOLUMNS 0 6820
358
176
0
0
20
24
247
1
3
2 HMON_ATM_INFO
196 2507
15
5
56
7225
3802
135
156
2507
0
4 SYSINDEXES 0 206
20
12
0
0
0
1
4
0
3
3 POLICY
0
5
1
3
0
0
4
0
5
0
0
5 SYSCOLPROPERTIES
0
0
1
0
0
0
0
0
0
0
3
4 HMON_COLLECTION
0
0
1
3
0
0
0
0
0
0
0
6 SYSINDEXCOLUSE
0 560
8
12
0
0
0
1
10
0
3
5 STMG_DBSIZE_INFO
0
1
1
0
0
0
0
0
1
0
0
8 SYSVIEWDEP 0 794
21
34
0
0
0
0
0
0
0
9 SYSPLAN
0 77
9
5
0
0
154
2
1
0
0
10 SYSPLANDEP 0 117
5
8
1
0
0
36
16
0
0
11 SYSSECTION 0 302
11
10
0
0
1448
2
32
0
0
12 SYSSTMT
0 323
11
10
0
0
0
2
32
0
0
13 SYSDBAUTH 0
0
1
3
0
0
0
0
0
0
0
14 SYSPLANAUTH0 110
3
8
0
0
0
1
1
0
0
15 SYSTABAUTH 0 372
10
25
0
0
0
2
17
0
22
OvFlReadsOvFlCrtes LfSize
0
0
0
0
0
0
0
0
0
0
21581
100
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
LobSize
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
576
0
0
1
64
0
0
0
0
0
320
64
2944
128
0
0
0
-tcbstats index option
• Command: db2pd –db db2mon –tcbstats index
Address TbspaceID TableID
0x03CF4B18
0
0x03CF4B18
0
0x03CF4B18
0
0x03CF4B18
0
0x03CF4B18
0
0x03CF4B18
0
0x03CF4B18
0
0x03D21398
0
0x03D21398
0
0x03D21398
0
0x02D22218
3
0x02D22218
3
0x02F9B298
0
0x02F9B298
0
0x02F9B298
0
0x02F9B298
0
0x02D22E18
3
TableNameIID
EmpPgDelRootSplits BndrySpltsPseuEmptPg
Scans KeyUpdatesInclUpdats NonBndSptsPgAllocs Merges
2 SYSTABLES
6
0
0
0
0
55
0
0
0
0
2 SYSTABLES
5
0
0
0
0
0
0
0
0
0
2 SYSTABLES
4
0
0
0
0
0
0
0
0
0
2 SYSTABLES
3
0
0
0
0
0
0
0
0
0
2 SYSTABLES
2
0
0
0
0
0
0
0
0
0
2 SYSTABLES
1
0
0
0
0
2592
0
0
1
1
2 SYSTABLES
0
0
0
0
0
0
0
0
0
0
3 SYSCOLUMNS 2
0
0
0
0
0
0
0
1
1
3 SYSCOLUMNS 1
0
0
1
0
51
0
0
6
7
3 SYSCOLUMNS 0
0
0
0
0
0
0
0
0
0
2 HMON_ATM_INFO 1
0
1
0
0
6693
0
0
1
3
2 HMON_ATM_INFO 0
0
0
0
0
0
0
0
0
1
4 SYSINDEXES 3
0
0
0
0
0
0
0
0
0
4 SYSINDEXES 2
0
0
0
0
0
0
0
0
0
4 SYSINDEXES 1
0
0
0
0
0
0
0
0
0
4 SYSINDEXES 0
0
0
0
0
0
0
0
0
0
3 POLICY
1
0
0
0
0
49
0
0
0
1
23
PseuDels DelClean IntNodSpl
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-tablespaces option
Command and output: db2pd -db db2mon -tablespaces tablespace=
2 file=c:\tsid.txt Sending -tablespaces output to c:\tsid.txt.
Database Partition 0 -- Database DB2MON -- Active -- Up 1 days 21:28:46
Tablespace 2 Configuration:
Address Type Content PageSz ExtentSz Prefetch BufID BufIDDisk FSC NumCntrs MaxStripe LastConsecPg Name
0x03ADE9D0 SMS Any 4096 32
0
1 1
On 1
0
31
USERSPACE1
Tablespace 2 Statistics:
Address TotPages UsablePgs UsedPgs
0x03ADE9D0 37403
37403
37403
PndFreePgs FreePgs HWM
State
0
0
0
0x00000000 0
Tablespace 2 Autoresize Statistics:
Address AS AR Auto InitSize IncSize IIP MaxSize LastResize
0x03ADE9D0 No No Yes 0
0
No 0
None
MinRecTime NQuiescers
0
LRF
No
Containers:
Address ContainNum Type TotalPages UseablePgs StripeSet Container
0x03ADEFD0 0
Path 37403
37403
0
C:\DB2\NODE0000\SQL00003\SQLT0002.0
24
-activestatements option
• Command: db2pd –db db2mon –activestatements
Database Partition 0 -- Database DB2MON -- Active -- Up 1 days 04:56:27
Active Statement List:
Address AppHandl [nod-index] UOW-ID
LastRefTime
0x02D279E0 1086 [000-01086]
3
00:19:54 2005
Snippet from –dynamic option
Dynamic SQL Statements:
Address
AnchID
StmtUID
x03F2D9B0
79
180
sysibm.systables
StmtID
1
NumEnv
0
AnchID StmtUID
79
NumVar
0
180
1
NumRef
1
25
EffISO
-2
NumExe
1
EffLockTOut EffDegree StartTime
0 Thu Sep 01 00:19:54 2005 Thu Sep 01
Text
select * from
Putting it All Together
Locks:
Address
TranHdl Lockname
0x0485E3B0 3
0x0485C998 2
Type
Mode Sts Owner
02000300270000000000000052 Row
02000300000000000000000054 Table
Dur HldCnt Att
.NS W 2
.IX G 2
ReleaseFlg
1 0 0x0000 0x00000001
1 0 0x0000 0x40000000
Transactions
Address AppHandl [nod-index] TranHdl Locks
State Tflag
Tflag2 Firstlsn
Lastlsn
LogSpace
SpaceReserved TID
0x045B1580 236 [000-00236] 2
8
WRITE 0x00000000 0x00000000 0x000003A9800C 0x000003AA27B6 234
572
0x045B2000 425
0x045B2A80 339
[000-00425] 3
[000-00339] 4
0
5
READ 0x00000000 0x00000000 0x000000000000 0x000000000000 0
READ 0x00000000 0x00000000 0x000000000000 0x000000000000 0
0
0
AxRegCnt GXID
0x0000000014DD 1
0x000000001716 1
0x00000000168C 1
0
0
0
Applications:
Address
AppHandl [nod-index] NumAgents CoorTid Status
0x01B19950 425
0x0090BE70 236
[000-00425] 1
[000-00236] 1
3652
2452
C-AnchID C-StmtUID L-AnchID L-StmtUID Appid
Lock-wait
UOW-Waiting
123
0
1
0
0
0
*LOCAL.DB2.050920034220
149 1
*LOCAL.DB2.050920021447
Dynamic SQL Statements:
Address
AnchID StmtUID
NumEnv
NumVar
NumRef
NumExe
Text
0x05E289C0 123 1
1
1
1
1
select * from staff
0x05E26FB0 129 1
1
1
1
1
SELECT SCHEMA, NAME,
STATS_DETAIL, STATS_STATE, STATS_TIME FROM SYSTOOLS.HMON_ATM_INFO WHERE (STATS_STATE = 2 OR STATS_STATE = 6) AND STATS_FLAG =
'Y'
0x05E27E60 149
1
1
1
1
1
insert into department
values('1b', 'Gunning','4', 'C00', NULL)
26
-bufferpools option
• Command: db2pd –database sample –bufferpools
• Returns bufferpool activity such as size in pages, post alter
size in pages, number of blocks being used for block-based
bufferpools
• Element of interest is table spaces suspended for I/O
• Indicated by non-zero value
• NOT as good as bufferpool snapshot
27
db2pd Problem Determination
•
•
•
-catch option
Can be used to catch any sqlcode, ZRC code, or ecf code and
capture information needed to help solve the problem
Can be used in conjunction with the db2cos callout script
which can be called to run any db2pd or OS command
28
db2cos
•
•
The DB2 callout script, db2cos is shipped with DB2 and is
located in the sqllib/cfg directory and must be moved to the
DB2 /bin directory before it can be used
db2cos default template provided
29
db2pd Problem Determination
Scenarios
•
•
Command: db2pd –catch -911,68 db2cos
Output:
Error Catch #2
Sqlcode:
ReasonCode:
ZRC:
ECF:
Component ID:
LockName:
LockType:
Current Count:
Max Count:
Bitmap:
Action:
Action:
-911
68
0
0
0
Not Set
Not Set
0
255
0x261
Error code catch flag enabled
Execute sqllib/db2cos callout script
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db2pd Problem Determination
Scenarios
•
db2diag.log entry:
2005-09-01-17.49.59.065000-240 I2998718H296
LEVEL: Event
PID : 220
TID : 6024
PROC : db2syscs.exe
INSTANCE: DB2
NODE : 000
FUNCTION: DB2 UDB, RAS/PD component, pdErrorCatch, probe:30
START : Error catch set for sqlCode -911 reasonCode 68
• Lock timeout received:
C:\Documents and Settings\Phil Gunning>db2 "select * from department"
SQL0911N The current transaction has been rolled back because of a deadlock
or timeout. Reason code "68". SQLSTATE=40001
•
Reset catch flags as follows: db2pd –catch clear all
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Stack Trace
•
•
The stack trace has been incorporated in db2pd as of V8.2.2
Issue the following command to produce a stack trace for a
process or thread
•
•
db2pd –stack 2632
Command response:
>db2pd -stack 2632
Attempting to dump stack trace for pid 2632.
See current DIAGPATH for trapfile.
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Summary
• db2pd is a lightweight monitoring tool that provides
information that is not available through other means
• Use it with the understanding that output may not be exact
due to changing data
• Best used via a script that formats the output into a more
readable format
• Run on a regular schedule, save to a file or insert into DB2
tables and review and make tuning adjustments as necessary
• Familiarize yourself with the extensive options and look for
continued improvements via Fixpaks and new releases
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Summary
• What db2pd is not:
• As of DB2 V8.2.3, it is not a replacement for snapshot monitoring or
event monitoring
• First version of it goes a long way in providing new
monitoring and problem determination capabilities
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References
• DB2 UDB Command Reference V8.2, SC09-4828-01
• http://publib.boulder.ibm.com/infocenter/db2help/index.jsp?t
opic=/com.ibm.db2.udb.doc/core/r0011729.htm
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db2pd in a Nutshell
Session: D04
THANK YOU!
Phil Gunning
Gunning Technology Solutions, LLC
[email protected]
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