但有的时候，数据库由于hang住，sqlplus不能连接时(在10g可以尝试用sqlplus -prelim连接数据库），可以使用操作系统上的调试工具来dump oracle系统状态。因为我的环境是linux，所以我先从gdb来介绍。
①首先获得要dump的进程号
ps -ef | grep LOCAL
oracle 9015 1 0 12:28 00:00:00 oracleretest (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
oracle 9110 8981 0 14:09 pts/4 00:00:00 grep LOCAL
②调用gdb进行dump
gdb $ORACLE_HOME/bin/oracle 9015
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type “show copying” to see the conditions.
There is absolutely no warranty for GDB. Type “show warranty” for details.
Attaching to program: /u01/app/oracle/product/10.1.0/db_1/bin/oracle, process 9015
Reading symbols from /u01/app/oracle/product/10.1.0/db_1/lib/libskgxp10.so…(no debugging symbols found)…done.
Loaded symbols for /u01/app/oracle/product/10.1.0/db_1/lib/libskgxp10.so
Reading symbols from /u01/app/oracle/product/10.1.0/db_1/lib/libhasgen10.so…done.
Loaded symbols for /u01/app/oracle/product/10.1.0/db_1/lib/libhasgen10.so
Reading symbols from /u01/app/oracle/product/10.1.0/db_1/lib/libskgxn2.so…done.
Loaded symbols for /u01/app/oracle/product/10.1.0/db_1/lib/libskgxn2.so
Reading symbols from /u01/app/oracle/product/10.1.0/db_1/lib/libocr10.so…done.
Loaded symbols for /u01/app/oracle/product/10.1.0/db_1/lib/libocr10.so
Reading symbols from /u01/app/oracle/product/10.1.0/db_1/lib/libocrb10.so…done.
Loaded symbols for /u01/app/oracle/product/10.1.0/db_1/lib/libocrb10.so
Reading symbols from /u01/app/oracle/product/10.1.0/db_1/lib/libocrutl10.so…done.
Loaded symbols for /u01/app/oracle/product/10.1.0/db_1/lib/libocrutl10.so
Reading symbols from /u01/app/oracle/product/10.1.0/db_1/lib/libjox10.so…done.
Loaded symbols for /u01/app/oracle/product/10.1.0/db_1/lib/libjox10.so
Reading symbols from /u01/app/oracle/product/10.1.0/db_1/lib/libclsra10.so…done.
Loaded symbols for /u01/app/oracle/product/10.1.0/db_1/lib/libclsra10.so
Reading symbols from /u01/app/oracle/product/10.1.0/db_1/lib/libdbcfg10.so…done.
Loaded symbols for /u01/app/oracle/product/10.1.0/db_1/lib/libdbcfg10.so
Reading symbols from /u01/app/oracle/product/10.1.0/db_1/lib/libnnz10.so…done.
Loaded symbols for /u01/app/oracle/product/10.1.0/db_1/lib/libnnz10.so
Reading symbols from /usr/lib/libaio.so.1…done.
Loaded symbols for /usr/lib/libaio.so.1
Reading symbols from /lib/libdl.so.2…done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/tls/libm.so.6…done.
Loaded symbols for /lib/tls/libm.so.6
Reading symbols from /lib/tls/libpthread.so.0…done.
[Thread debugging using libthread_db enabled]
[New Thread -1219938624 (LWP 3765)]
Loaded symbols for /lib/tls/libpthread.so.0
Reading symbols from /lib/libnsl.so.1…done.
Loaded symbols for /lib/libnsl.so.1
Reading symbols from /lib/tls/libc.so.6…done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /lib/ld-linux.so.2…done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/libnss_files.so.2…done.
Loaded symbols for /lib/libnss_files.so.2
0×006967a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
(gdb) print ksudss(10)
[Switching to Thread -1219938624 (LWP 9015)]
$1 = 213658428
(gdb) detach
Detaching from p