前言
最近在工作中遇到了一个问题，错误是Oracle dbca时报错：ORA-12547: TNS:lost contact，通过查找相关的资料终于找到了解决的方法，下面分享给大家，话不多说了，来一起看看详细的介绍吧。
环境：
- OS:RHEL6.5 x86-64bit
- DB:11.2.0.4 for Linux 86-64bit
思路：
DBCA报错，首先看DBCA的日志，日志中也是报ORA-12547: TNS:lost contact
于是再sqlplus / as sysdba敲回车，也是报ORA-12547: TNS:lost contact，
基于之前的工程经验，先到bdump下找trc文件，不过在bdump下是没有任何trc生成的。
再到/u01/app/oracle/product/11.2.0/db_1/rdbms/log下找trc文件，果然找到了：
[oracle@dg1 log]$ pwd /u01/app/oracle/product/11.2.0/db_1/rdbms/log [oracle@dg1 log]$ ls -lrt total 9808 -rw-r-----. 1 oracle oinstall 401207 Feb 1 16:16 dbua1557284_ora_8053.trc -rw-r-----. 1 oracle oinstall 401207 Feb 1 16:16 dbua1557284_ora_8062.trc -rw-r-----. 1 oracle oinstall 401207 Feb 1 16:16 dbua1557284_ora_8065.trc -rw-r-----. 1 oracle oinstall 401373 Feb 1 16:18 dg1_ora_8227.trc -rw-r-----. 1 oracle oinstall 401228 Feb 1 16:26 dg1_ora_2701.trc -rw-r-----. 1 oracle oinstall 401228 Feb 1 16:26 dg1_ora_2706.trc -rw-r-----. 1 oracle oinstall 401410 Feb 1 16:27 dg1_ora_2715.trc -rw-r-----. 1 oracle oinstall 401228 Feb 1 16:27 dg1_ora_2722.trc -rw-r-----. 1 oracle oinstall 401244 Feb 1 16:31 dbua3144297_ora_2792.trc -rw-r-----. 1 oracle oinstall 401244 Feb 1 16:31 dbua3144297_ora_2801.trc -rw-r-----. 1 oracle oinstall 401244 Feb 1 16:31 dbua3144297_ora_2804.trc -rw-r-----. 1 oracle oinstall 401410 Feb 1 16:34 dg1_ora_2930.trc -rw-r-----. 1 oracle oinstall 401341 Feb 1 17:27 dg1_ora_3181.trc -rw-r-----. 1 oracle oinstall 401090 Feb 1 17:27 dg1_ora_3187.trc -rw-r-----. 1 oracle oinstall 401341 Feb 1 17:27 dg1_ora_3190.trc -rw-r-----. 1 oracle oinstall 401090 Feb 1 17:28 dg1_ora_3205.trc -rw-r-----. 1 oracle oinstall 401341 Feb 1 17:28 dg1_ora_3210.trc -rw-r-----. 1 oracle oinstall 401090 Feb 1 17:28 dg1_ora_3214.trc -rw-r-----. 1 oracle oinstall 401090 Feb 1 17:36 dg1_ora_3313.trc -rw-r-----. 1 oracle oinstall 401341 Feb 1 17:37 dg1_ora_3329.trc -rw-r-----. 1 oracle oinstall 401090 Feb 1 17:37 dg1_ora_3341.trc -rw-r-----. 1 oracle oinstall 401090 Feb 1 17:37 dg1_ora_3344.trc -rw-r-----. 1 oracle oinstall 401341 Feb 1 17:40 dg1_ora_3369.trc -rw-r-----. 1 oracle oinstall 401341 Feb 1 17:40 dg1_ora_3375.trc -rw-r-----. 1 oracle oinstall 401090 Feb 1 17:40 dg1_ora_3378.trc [oracle@dg1 log]$ [oracle@dg1 log]$ vi dg1_ora_3369.trc Dump file /u01/app/oracle/product/11.2.0/db_1/rdbms/log/dg1_ora_3369.trc *** 2016-02-01 17:40:23.652 Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1 System name: Linux Node name: dg1 Release: 2.6.32-431.el6.x86_64 Version: #1 SMP Sun Nov 10 22:19:54 EST 2013 Machine: x86_64 Instance name: dg1 Redo thread mounted by this instance: 0Oracle process number: 0 Unix process pid: 3369, image: oracle@dg1 *** 2016-02-01 17:40:23.652 skgm error 27135: errno = 0, info = 0, 0, 0, 0, 1048576, 2097152, 0 skgm error 27135: errno = 0, info = 0, 0, 0, 0, 1048576, 2097152, 0 *** 2016-02-01 17:40:23.654 Exception [type: SIGSEGV, Address not mapped to object] [ADDR:0x3D8] [PC:0x95BE6EB, opiodr()+11347] [flags: 0x0, count: 1] Registers: %rax: 0x000000000c0ea630 %rbx: 0x000000000c0ea638 %rcx: 0x0000000000000000 %rdx: 0x0000000000000000 %rdi: 0x000000000c0ccba0 %rsi: 0x00007fffa308e250 %rsp: 0x00007fffa308d970 %rbp: 0x00007fffa308e440 %r8: 0x00007fffa308d970 %r9: 0x00007fffa308e440 %r10: 0x00007fffa308c600 %r11: 0x00007fab40ec1538 %r12: 0x000000000000003c %r13: 0x0000000000000004 %r14: 0x00007fffa308e6f8 %r15: 0x0000000000000002 %rip: 0x00000000095be6eb %efl: 0x0000000000010246 opiodr()+11325 (0x95be6d5) lea (%rax,%rbx),%rdx opiodr()+11329 (0x95be6d9) mov %rdx,(%rcx,%rbx) opiodr()+11333 (0x95be6dd) mov 0x2b34a84(%rip),%rax opiodr()+11340 (0x95be6e4) mov 0x178(%rax),%rdx > opiodr()+11347 (0x95be6eb) movzwl 0x3d8(%rdx),%ecx opiodr()+11354 (0x95be6f2) test $0x100,%ecx opiodr()+11360 (0x95be6f8) jz 0x95bc8c7 opiodr()+11366 (0x95be6fe) mov -0x18(%rbp),%eax opiodr()+11369 (0x95be701) cmp $60,%eax *** 2016-02-01 17:40:23.660 dbkedDefDump(): Starting a non-incident diagnostic dump (flags=0x1, level=3, mask=0x0) ----- Error Stack Dump ----- ORA-07445: exception encountered: core dump [opiodr()+11347] [SIGSEGV] [ADDR:0x3D8] [PC:0x95BE6EB] [Address not mapped to object] [] ORA-27135: Operating System hard stack limit is set too low ----------->>>>>>>注意此处 Additional information: 1048576 Additional information: 2097152 ----- SQL Statement (None) ----- Current SQL information unavailable - no SGA. 以下省略。。。
解决方法
最后确认，是/etc/security/limits.conf文件的问题：
oracle soft nproc 2047 oracle hard nproc 16384 oracle soft nofile 1024 oracle hard nofile 65536 oracle soft stack 1024--->此处应该是10240,依据:Requirements for Installing Oracle 11gR2 RDBMS on RHEL6 or OL6 64-bit (x86-64) (文档 ID 1441282.1)
修改完之后，关闭dbca界面，exit退出oracle用户，su - oracle用户，再重新发起dbca即可。
总结
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