Here are the data structures with brief descriptions:

Cmdb_copy
CMDB_cursor	Opaque structure for navigating through a database
CMDB_db
CMDB_dbx
CMDB_env	Opaque structure for a database environment
CMDB_envinfo	Information about the environment
CMDB_ID2
CMDB_meta
CMDB_metabuf
CMDB_name
CMDB_node
CMDB_ntxn
CMDB_page
CMDB_page2
CMDB_pgstate
CMDB_reader
CMDB_rxbody
CMDB_stat	Statistics for a database in the environment
CMDB_txbody
CMDB_txn	Opaque structure for a transaction handle
CMDB_txninfo
CMDB_val	Generic structure used for passing keys and data in and out of the database
CMDB_xcursor