Search notes:

oradebug dumptype

SQL> oradebug  help dumptype
DUMPTYPE       <address> <type> <count>  Print/dump an address with type info
Get address of variable ksfdll_: 
SQL> oradebug dumpvar sga ksfdll_
ksfdstll * ksfdll_ [7FF7B20B0A38, 7FF7B20B0A40) = C8954D10 00007FFF
Type of struct at found address is ksfdstll *, that is a pointer to a ksfdstll struct which resides at 0x00007FFFC8954D10.
Dump the values of that struct: 
SQL> oradebug dumptype 0x00007FFFC8954D10 ksfdstll 1
        IO_COMPONENT_ID = 14
        TIMESTAMP = 1636713503
        IO_SIZE = 16
        WAIT_EVENT = <NULL>
        FILE_NAME = 'C:\ORACLE\DB\ORA19\CTL1.ORA'
        IO_LATENCY = 641
        DISK1_NAME = ''
        DISK1_IO_LATENCY = 641
        DISK2_NAME = ''
        DISK2_IO_LATENCY = 0
        DISK3_NAME = ''
        DISK3_IO_LATENCY = 0

Error messages

Trying to dump a structure using an unknown type name results in an ORA-32512 error: 
SQL> oradebug setmypid
SQL> oradebug dumptype 0x7FF6A57DF310 heap_qesxl_v1 1
ORA-32512: type 'heap_qesxl_v1' is unknown
Trying to read from memory that is not assigned to Oracle results in ORA-00081: address range [0x1094090349, 0x109409034A) is not readable.

Datatypes

Some datatype names that can be used for dumping include

Index