You are running a query against DBA_EXTENTS to find the segment information (most probably you would be using
this to find a CORRUPTED segment/object) for a particular FILE_ID and BLOCK_ID.
Query might look something like this.
where file_id =
This query might run longer and sometimes you may lose your patience waiting for it.
- Dump the block and take the object id using the below command
alter system dump datafile
Eg.alter system dump datafile 1811 block 20000;
FYI, this command generate a trace file in the user_dump_dest directory
- Grep the object number from the trace file.
Locate the trace file and grep the object id which will be presented in HEX value.
grep "seg/obj" op01csdb01_ora_13143.trc
seg/obj: 0xe024a2 csc: 0x878.a5583a53 itc: 50 flg: E typ: 1 - DATA
- Find the object information from DBA_OBJECTS
where (object_id=to_number('E024A2', 'xxxxxx')
Note : the count of 'x' should be equal to the number of characters in the source.
Eg. E024A2 - is 6 character string, hence i used 'xxxxxx'
Keywords : query; dba_extents; long; slow; corrupt ; segment; object