使用 onstat -g bth 命令显示阻塞和正在等待线程之间的依赖关系。使用 onstat -g BTH 命令显示阻塞线程的会话和堆信息。
图: onstat -g bth 命令输出
This command attempts to identify any blocking threads.
Highest level blocker(s)
tid name session
48 sqlexec 26
Threads waiting on resources
tid name blocking resource blocker
49 sqlexec MGM 48
13 readahead_0 Condition (ReadAhead) -
50 sqlexec Lock (0x4411e578) 49
51 sqlexec Lock (0x4411e578) 49
52 sqlexec Lock (0x4411e578) 49
53 sqlexec Lock (0x4411e578) 49
57 bf_priosweep() Condition (bp_cond) -
58 scan_1.0 Condition (await_MC1) -
59 scan_1.0 Condition (await_MC1) -
Run 'onstat -g BTH' for more info on blockers.
Stack for thread: 48 sqlexec
base: 0x00000000461a3000
len: 69632
pc: 0x00000000017b32c3
tos: 0x00000000461b2e30
state: ready
vp: 1
0x00000000017b32c3 (oninit) yield_processor_svp
0x00000000017bca6c (oninit) mt_wait
0x00000000019d4e5c (oninit) net_buf_get
0x00000000019585bf (oninit) recvsocket
0x00000000019d1759 (oninit) tlRecv
0x00000000019ce62d (oninit) slSQIrecv
0x00000000019c43ed (oninit) pfRecv
0x00000000019b2580 (oninit) asfRecv
0x000000000193db2a (oninit) ASF_Call
0x0000000000c855dd (oninit) asf_recv
0x0000000000c8573c (oninit) _iread
0x0000000000c835cc (oninit) _igetint
0x0000000000c72a9e (oninit) sqmain
0x000000000194bb38 (oninit) listen_verify
0x000000000194ab8a (oninit) spawn_thread
0x0000000001817de3 (oninit) th_init_initgls
0x00000000017d3135 (oninit) startup
This command attempts to identify any blocking threads.
Highest level blocker(s)
tid name session
48 sqlexec 26
session effective #RSAM total used dynamic
id user user tty pid hostname threads memory memory explain
26 gbasedbt - 45 31041 mors 2 212992 186568 off
Program :
/work3/JC/VIEWS/jc_dct_phase2.view/.s/00055/80003fd351f804d3dbaccess
tid name rstcb flags curstk status
48 sqlexec 448bc5e8 ---P--- 4560 ready-
58 scan_1.0 448bb478 Y------ 896 cond wait await_MC1 -
Memory pools count 2
name class addr totalsize freesize #allocfrag #freefrag
26 V 45fcc040 208896 25616 189 16
26*O0 V 462ad040 4096 808 1 1
name free used name free used
overhead 0 6576 mtmisc 0 72
resident 0 72 scb 0 240
opentable 0 7608 filetable 0 1376
log 0 33072 temprec 0 17744
blob 0 856 keys 0 176
ralloc 0 55344 gentcb 0 2240
ostcb 0 2992 sqscb 0 21280
sql 0 11880 xchg_desc 0 1528
xchg_port 0 1144 xchg_packet 0 440
xchg_group 0 104 xchg_priv 0 336
hashfiletab 0 1144 osenv 0 2520
sqtcb 0 15872 fragman 0 1024
shmblklist 0 416 sqlj 0 72
rsam_seqscan 0 368
sqscb info
scb sqscb optofc pdqpriority optcompind directives
4499c1c0 461c1028 0 100 2 1
Sess SQL Current Iso Lock SQL ISAM F.E.
Id Stmt type Database Lvl Mode ERR ERR Vers Explain
26 SELECT jc CR Not Wait 0 0 9.24 Off
Current statement name : unlcur
Current SQL statement (5) :
select * from systables,syscolumns,sysfragments
Last parsed SQL statement :
select * from systables,syscolumns,sysfragments
该会话信息段包含的信息与 onstat -g ses 命令输出的信息相同。请参阅 onstat -g ses 命令：打印与会话有关的信息。
剩下的信息显示了该线程的堆信息。