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oracle lmd0,用strace跟踪分析oracle 10.2.0.1 rac lmd进程系列二

發布時間：2024/3/24 编程问答 37 豆豆

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結論：

1,strace -p跟蹤lmd進程，是和fd為9及17的2個socket進行通訊

2,這2個socket為

9為socket:[1361566]，而17為socket:[1361581]

3，strace的應用關鍵在于有針性性理解操作系統的函數，比如times,getrusage,poll的含義是什么，你就明白了lmd進程到底在作什么

4, find .|xargs grep -ri "2015-11-10 17:30:32.608" -l獲取當前目錄是哪個文件字符串2015-11-10 17:30:32.608，僅打印文件名稱出來

或者通過strace輸出的write函數的write函數也可定位到是寫入到lmd trc file

測試

1,獲取lmd進程

[oracle@jingfa1 ~]$ ps -ef|grep lmd

oracle ? ?4774 ? ? 1 ?0 Nov09 ? ? ? ? ?00:01:19 asm_lmd0_+ASM1

oracle ? 15271 ? ? 1 ?0 07:40 ? ? ? ? ?00:00:42 ora_lmd0_jingfa1

oracle ? 17639 17535 ?0 17:06 pts/3 ? ?00:00:00 grep lmd

2，用strace跟蹤lmd進程

[oracle@jingfa1 ~]$ strace -p 15271

Process 15271 attached - interrupt to quit

times({tms_utime=3783, tms_stime=445, tms_cutime=0, tms_cstime=0}) = 436476294

getrusage(RUSAGE_SELF, {ru_utime={37, 830248}, ru_stime={4, 459322}, ...}) = 0

times({tms_utime=3783, tms_stime=445, tms_cutime=0, tms_cstime=0}) = 436476294

poll([{fd=9, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}, {fd=17, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 2, 80) = 0 (Timeout) --fd為9及17，會一直相同的循環使用poll函數

times({tms_utime=3783, tms_stime=445, tms_cutime=0, tms_cstime=0}) = 436476302

getrusage(RUSAGE_SELF, {ru_utime={37, 830248}, ru_stime={4, 459322}, ...}) = 0

times({tms_utime=3783, tms_stime=445, tms_cutime=0, tms_cstime=0}) = 436476302

poll([{fd=9, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}, {fd=17, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 2, 80) = 0 (Timeout)

3，到對應目錄查查上述的fd到底是什么？

可見9為socket:[1361566]，而17為socket:[1361581]

[root@jingfa1 fd]# pwd

/proc/15271/fd

[root@jingfa1 fd]# ll

total 0

lr-x------ 1 oracle oinstall 64 Nov 10 17:00 0 -> /dev/null

lr-x------ 1 oracle oinstall 64 Nov 10 17:00 1 -> /dev/null

lrwx------ 1 oracle oinstall 64 Nov 10 17:00 10 -> /u01/app/oracle/product/10.2.0/db_1/dbs/lkinstjingfa1 (deleted)

lr-x------ 1 oracle oinstall 64 Nov 10 17:00 11 -> /dev/zero

lrwx------ 1 oracle oinstall 64 Nov 10 17:00 12 -> /u01/app/oracle/admin/jingfa/adump/ora_15228.aud

lr-x------ 1 oracle oinstall 64 Nov 10 17:00 13 -> /u01/app/oracle/product/10.2.0/db_1/rdbms/mesg/oraus.msb

lr-x------ 1 oracle oinstall 64 Nov 10 17:00 14 -> /dev/zero

lrwx------ 1 oracle oinstall 64 Nov 10 17:00 15 -> /u01/app/oracle/product/10.2.0/db_1/dbs/hc_jingfa1.dat

lrwx------ 1 oracle oinstall 64 Nov 10 17:00 16 -> socket:[1361569]

lrwx------ 1 oracle oinstall 64 Nov 10 17:00 17 -> socket:[1361581]

lr-x------ 1 oracle oinstall 64 Nov 10 17:00 18 -> /u01/app/oracle/product/10.2.0/db_1/rdbms/mesg/oraus.msb

l-wx------ 1 oracle oinstall 64 Nov 10 17:00 2 -> /u01/app/oracle/admin/jingfa/bdump/jingfa1_lmd0_15271.trc

lr-x------ 1 oracle oinstall 64 Nov 10 17:00 3 -> /dev/null

lr-x------ 1 oracle oinstall 64 Nov 10 17:00 4 -> /dev/null

l-wx------ 1 oracle oinstall 64 Nov 10 17:00 5 -> /u01/app/oracle/admin/jingfa/udump/jingfa1_ora_15228.trc

l-wx------ 1 oracle oinstall 64 Nov 10 17:00 6 -> /u01/app/oracle/admin/jingfa/bdump/alert_jingfa1.log

lrwx------ 1 oracle oinstall 64 Nov 10 17:00 7 -> /u01/app/oracle/product/10.2.0/db_1/dbs/hc_jingfa1.dat

l-wx------ 1 oracle oinstall 64 Nov 10 17:00 8 -> /u01/app/oracle/admin/jingfa/bdump/alert_jingfa1.log

lrwx------ 1 oracle oinstall 64 Nov 10 17:00 9 -> socket:[1361566]

[root@jingfa1 fd]#

可見如果lmd進程暫停，內部機制如下，提示資源暫不可用

SQL> oradebug setospid 15271

Oracle pid: 6, Unix process pid: 15271, image: oracle@jingfa1 (LMD0)

SQL> oradebug suspend

Statement processed.

semtimedop(1277953, 0x7fff7d684890, 1, {1, 0}) = -1 EAGAIN (Resource temporarily unavailable)

如果恢復LMD，資源又恢復正常，又開始了各種操作系統函數的調用運行

SQL> oradebug resume

Statement processed.

getrusage(RUSAGE_SELF, {ru_utime={38, 665122}, ru_stime={4, 631295}, ...}) = 0

times({tms_utime=3866, tms_stime=463, tms_cutime=0, tms_cstime=0}) = 436558478

poll([{fd=9, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}, {fd=17, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 2, 80) = 0 (Timeout)

times({tms_utime=3866, tms_stime=463, tms_cutime=0, tms_cstime=0}) = 436558486

getrusage(RUSAGE_SELF, {ru_utime={38, 665122}, ru_stime={4, 631295}, ...}) = 0

times({tms_utime=3866, tms_stime=463, tms_cutime=0, tms_cstime=0}) = 436558486

poll([{fd=9, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}, {fd=17, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 2, 80) = 0 (Timeout)

times({tms_utime=3866, tms_stime=463, tms_cutime=0, tms_cstime=0}) = 436558494

getrusage(RUSAGE_SELF, {ru_utime={38, 665122}, ru_stime={4, 631295}, ...}) = 0

getrusage(RUSAGE_SELF, {ru_utime={38, 665122}, ru_stime={4, 632295}, ...}) = 0

而且lmd進程狀態變化時，會向其trace file寫入信息

write(2, "*** 2015-11-10 17:30:32.608", 27) = 27 ?---write函數含義：write(fb,buf,size)

write(2, "\n", 1) ? ? ? ? ? ? ? ? ? ? ? = 1

write(2, "SKGXPIWAIT: keepalive_reset elap"..., 86) = 86

write(2, "\n", 1) ? ? ? ? ? ? ? ? ? ? ? = 1

[root@jingfa1 fd]# locate "2015-11-10 17:30:32.608"

[oracle@jingfa1 bdump]$ pwd

/u01/app/oracle/admin/jingfa/bdump

[oracle@jingfa1 bdump]$ find .|xargs grep -ri "2015-11-10 17:30:32.608" -l

./jingfa1_lmd0_15271.trc

[oracle@jingfa1 bdump]$ more *|grep "2015-11-10 17:30:32.608"

*** 2015-11-10 17:30:32.608

或者通過write函數的write函數也可定位到是寫入到lmd trc file

[oracle@jingfa1 fd]$ pwd

/proc/15271/fd

[oracle@jingfa1 fd]$ ll -l 2

l-wx------ 1 oracle oinstall 64 Nov 10 17:00 2 -> /u01/app/oracle/admin/jingfa/bdump/jingfa1_lmd0_15271.trc

[oracle@jingfa1 fd]$

來自 “ ITPUB博客 ” ，鏈接：http://blog.itpub.net/9240380/viewspace-1828334/，如需轉載，請注明出處，否則將追究法律責任。

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