在上一篇文章中，说到bdump目录的x权限丢失，导致oracle数据库异常。
下面就来用linux 的strace命令来跟踪一下，当bdump目录的x权限丢失时，sqlplus / as sysdba会有什么样的输出：
strace命令如下，该命令来源于：Using Strace in Linux to Debug Hang Type Problems (Doc ID 1391746.1)

strace -fe verbose=all -e write=all -e read=all -o /u02/app/output7.txt /u02/app/oracle/product/11.2.0.4/db_1/bin/sqlplus / as sysdba

当上面的strace命令执行完毕后，output7.txt的大小为：

[root@rhel63single app]# pwd/u02/app[root@rhel63single app]# du -sh output7.txt54M     output7.txt

在该文件的中，有如下信息：

5774  stat("/u01/app/oracle/diag", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 05774  stat("/u01/app/oracle/diag/rdbms", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 05774  stat("/u01/app/oracle/diag/rdbms/test", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 05774  stat("/u01/app/oracle/diag/rdbms/test/test", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 05774  stat("/u01/app/oracle/diag/rdbms/test/test/trace", {st_mode=S_IFDIR|0650, st_size=49152, ...}) = 0   --->此处说明该bdump目录的权限为6505774  mkdir("/u01/app/oracle/diag/rdbms/test/test/trace", 0775) = -1 EEXIST (File exists) ----->此处要以755权限新建该bdump目录，只是由于该目录已经存在而建立失败。

而当bdump目录有x权限时，sqlplus / as sysdba的strace跟踪如下：

6451  stat("/u01/app/oracle", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 06451  getrlimit(RLIMIT_NOFILE, {rlim_cur=64*1024, rlim_max=64*1024}) = 06451  open("/proc/self/fd/", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 56451  fcntl(5, F_GETFD)                 = 0x1 (flags FD_CLOEXEC)6451  getrlimit(RLIMIT_FSIZE, {rlim_cur=RLIM_INFINITY, rlim_max=RLIM_INFINITY}) = 06451  stat("/u01/app/oracle/diag", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/trace", {st_mode=S_IFDIR|0750, st_size=49152, ...}) = 0 --->该bdump权限是7506451  stat("/u01/app/oracle/diag/rdbms/test/test/alert", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/incident", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/metadata", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/metadata_pv", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/metadata_dgif", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/hm", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/ir", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/incpkg", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/sweep", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/lck", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/cdump", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/stage", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/metadata", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 06451  lstat("/u01/app/oracle/diag/rdbms/test/test/metadata/ADR_CONTROL.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/metadata/ADR_CONTROL.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 06451  lstat("/u01/app/oracle/diag/rdbms/test/test/metadata/ADR_INVALIDATION.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/metadata/ADR_INVALIDATION.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 06451  lstat("/u01/app/oracle/diag/rdbms/test/test/metadata/INC_METER_IMPT_DEF.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/metadata/INC_METER_IMPT_DEF.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 06451  lstat("/u01/app/oracle/diag/rdbms/test/test/metadata/INC_METER_PK_IMPTS.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/metadata/INC_METER_PK_IMPTS.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 06451  lstat("/u01/app/oracle/diag/rdbms/test/test/metadata/INCIDENT.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 06451  stat("/u01/app/oracle/diag/rdbms/test/test/metadata/INCIDENT.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 06451  brk(0xd867000)                    = 0xd8670006451  socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = 66451  bind(6, {sa_family=AF_INET6, sin6_port=htons(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 06451  close(6)                          = 06451  access("/u02/app/oracle/product/11.2.0.4/db_1/network/admin/sqlnet.ora", F_OK) = -1 ENOENT (No such file or directory)6451  stat("/u02/app/oracle", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 06451  stat("/u02/app/oracle/diag", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 06451  stat("/u02/app/oracle/diag/clients", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 06451  uname({sys="Linux", node="rhel63single", ...}) = 06451  getuid()                          = 5006451  socket(PF_FILE, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 66451  connect(6, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)6451  close(6)                          = 06451  socket(PF_FILE, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 66451  connect(6, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)6451  close(6)                          = 06451  open("/etc/nsswitch.conf", O_RDONLY) = 66451  fstat(6, {st_mode=S_IFREG|0644, st_size=1688, ...}) = 06451  mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fe94438c0006451  read(6, "#\n# /etc/nsswitch.conf\n#\n# An ex"..., 4096) = 1688

使用Linux strace命令来跟踪 bdump目录的x权限丢失时sqlplus / as sysdba 的输出