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TNS:could not resolve the connect identifier specified
Backtrace message unwound by exceptions
invalid identifier
PL/SQL compilation error
internal error
missing expression
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end-of-file on communication channel
TNS:listener unknown in connect descriptor
insufficient privileges
PL/SQL: numeric or value error string
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target host or object does not exist
invalid number
unable to allocate string bytes of shared memory
resource busy and acquire with NOWAIT specified
error occurred at recursive SQL level string
ORACLE initialization or shutdown in progress
archiver error. Connect internal only, until freed
snapshot too old
unable to extend temp segment by string in tablespace
Credential retrieval failed
missing or invalid option
invalid username/password; logon denied
unable to create INITIAL extent for segment
out of process memory when trying to allocate string bytes
shared memory realm does not exist
cannot insert NULL
TNS:unable to connect to destination
remote database not found ora-02019
exception encountered: core dump
inconsistent datatypes
no data found
TNS:operation timed out
PL/SQL: could not find program
existing state of packages has been discarded
maximum number of processes exceeded
error signaled in parallel query server
ORACLE instance terminated. Disconnection forced
TNS:packet writer failure
see ORA-12699
missing right parenthesis
name is already used by an existing object
cannot identify/lock data file
invalid file operation
quoted string not properly terminated

Identifying the content of a corrupted block in system tablespace

Vlado Barun


I have a corrupted block in the system tablespace.
I used the standard query to identify the object that the block but it

1 SELECT segment_name
2    , segment_type
3    , owner
4    , tablespace_name
5    , block_id
6    , blocks
7 FROM sys.dba_extents
8 WHERE file_id = 1
9* AND 8002 BETWEEN block_id and block_id + blocks -1 FROM sys.dba_extents
ERROR at line 7:
ORA-01578: ORACLE data block corrupted (file # 1, block # 8002)
ORA-01110: data file 1: '/u100/oradata/fstst/system01.dbf'

Then I did this:

select owner
    , segment_name
    , segment_type
    , tablespace_name
    , block_id
    , blocks
from dba_extents
where file_id=1
and block_id in (
    select max(block_id)
    from dba_extents
    where file_id=1
    and block_id <= 8002

----- ------------ ------------ ---------------- -------- ------
SYS  C_OBJ#     CLUSTER    SYSTEM       7978      25

So, the object that the corrupt block belongs to is c_obj#.

Is that correct?

If so, and since c_obj# stores data about objects (metadata), it basically
means that I can not access the object whose metadata is in that block.
So, I'm trying to identify which object is lost.
For example, if it's just an index, I should be able to export all the
objects from database into a new database and rebuild the index, and resolve
the corruption in that way. Any idea how I can identify the object whose
metadata is lost?

I'm aware that Oracle support should be contacted, however a friend of mine
asked me to look into this before they contact Oracle Support since they
don't have a support contract anymore...
BTW, this is 8.0.6, they identified this problem 3 months ago in their
Peoplesoft application, and of course they don't have a good backup from
which to recover...

Vlado Barun, M.Sc.

Mobile: 865 335 7652

AIM: vbarun2