I am attempting to isolate the identification attributes of an individual block. Prior to multitenant, this was easy to do using the RDBA to get the file and block. However, in a PDB, the RDBA does not tell me how the root container identifies the block either by the file number at the root level or by the container ID.
I've done a lot of digging and debugging and can't figure out how the root container identifies a block or where it might be in the block header. Any help would be appreciated.
Seth
Seth, in the good old times we identified the segment containing the block by using DBA_EXTENTS. In the multi-tenant environment, you can use CDB_EXTENTS:
Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production Version 19.12.0.0.0 SQL> desc cdb_extents Name Null? Type ----------------------------------------- -------- ---------------------------- OWNER VARCHAR2(128) SEGMENT_NAME VARCHAR2(128) PARTITION_NAME VARCHAR2(128) SEGMENT_TYPE VARCHAR2(18) TABLESPACE_NAME VARCHAR2(30) EXTENT_ID NUMBER FILE_ID NUMBER BLOCK_ID NUMBER BYTES NUMBER BLOCKS NUMBER RELATIVE_FNO NUMBER CON_ID NUMBER SQL>If I understand you correctly, you want to identify the segment containing the block from the root container? If that is not what you want, please ignore my reply.
-- Mladen Gogala Database Consultant Tel: (347) 321-1217 https://dbwhisperer.wordpress.com-- //www.freelists.org/webpage/oracle-l
