Sqlplus/as SYSDBA output by using the Linux strace command to track the Bdump directory's X permission loss

In the previous article, we said that the X permission for the Bdump directory was missing, resulting in an Oracle database exception.
The following is the Linux strace command to track the Bdump directory when the X permission is lost, Sqlplus/as SYSDBA will have what kind of output:
The Strace command is derived from the following command: 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




When the above strace command finishes executing, the size of the Output7.txt is:





[root@rhel63single app]# pwd
/u02/app
[root@rhel63single app]# du -sh output7.txt
54M     output7.txt




In the file, you have the following information:




5774 stat("/u01/app/oracle/diag", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
5774 stat("/u01/app/oracle/diag/rdbms", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
5774 stat("/u01/app/oracle/diag/rdbms/test", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
5774 stat("/u01/app/oracle/diag/rdbms/test/test", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
5774 stat("/u01/app/oracle/diag/rdbms/test/test/trace", {st_mode=S_IFDIR|0650, st_size=49152, ...}) = 0 --->Here is the description of the bdump directory The permission is 650
5774 mkdir("/u01/app/oracle/diag/rdbms/test/test/trace", 0775) = -1 EEXIST (File exists) ----->Here, we need to create the bdump directory with 755 permissions, but The creation failed because the directory already exists.




And when the Bdump directory has x permissions, the Strace trace of Sqlplus/as sysdba is as follows:



6451 stat("/u01/app/oracle", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
6451 getrlimit(RLIMIT_NOFILE, {rlim_cur=64*1024, rlim_max=64*1024}) = 0
6451 open("/proc/self/fd/", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 5
6451 fcntl(5, F_GETFD) = 0x1 (flags FD_CLOEXEC)
6451 getrlimit(RLIMIT_FSIZE, {rlim_cur=RLIM_INFINITY, rlim_max=RLIM_INFINITY}) = 0
6451 stat("/u01/app/oracle/diag", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/trace", {st_mode=S_IFDIR|0750, st_size=49152, ...}) = 0 ---> The bdump privilege is 750
6451 stat("/u01/app/oracle/diag/rdbms/test/test/alert", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/incident", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/metadata", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/metadata_pv", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/metadata_dgif", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/hm", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/ir", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/incpkg", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/sweep", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/lck", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/cdump", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/stage", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/metadata", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
6451 lstat("/u01/app/oracle/diag/rdbms/test/test/metadata/ADR_CONTROL.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/metadata/ADR_CONTROL.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 0
6451 lstat("/u01/app/oracle/diag/rdbms/test/test/metadata/ADR_INVALIDATION.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/metadata/ADR_INVALIDATION.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 0
6451 lstat("/u01/app/oracle/diag/rdbms/test/test/metadata/INC_METER_IMPT_DEF.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/metadata/INC_METER_IMPT_DEF.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 0
6451 lstat("/u01/app/oracle/diag/rdbms/test/test/metadata/INC_METER_PK_IMPTS.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/metadata/INC_METER_PK_IMPTS.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 0
6451 lstat("/u01/app/oracle/diag/rdbms/test/test/metadata/INCIDENT.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 0
6451 stat("/u01/app/oracle/diag/rdbms/test/test/metadata/INCIDENT.ams", {st_mode=S_IFREG|0640, st_size=65536, ...}) = 0
6451 brk (0xd867000) = 0xd867000
6451 socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = 6
6451 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) = 0
6451 close(6) = 0
6451 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, ...}) = 0
6451 stat("/u02/app/oracle/diag", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
6451 stat("/u02/app/oracle/diag/clients", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
6451 uname({sys="Linux", node="rhel63single", ...}) = 0
6451 getuid() = 500
6451 socket(PF_FILE, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 6
6451 connect(6, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
6451 close(6) = 0
6451 socket(PF_FILE, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 6
6451 connect(6, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
6451 close(6) = 0
6451 open("/etc/nsswitch.conf", O_RDONLY) = 6
6451 fstat(6, {st_mode=S_IFREG|0644, st_size=1688, ...}) = 0
6451 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fe94438c000
6451 read(6, "#\n# /etc/nsswitch.conf\n#\n# An ex"..., 4096) = 1688


Sqlplus/as SYSDBA output by using the Linux strace command to track the Bdump directory's X permission loss