Here are the information_schema objects from MySQL, if that helps:
CHARACTER_SETS
COLLATIONS
COLLATION_CHARACTER_SET_APPLICABILITY
COLUMNS
COLUMN_PRIVILEGES
ENGINES
EVENTS
FILES
GLOBAL_STATUS
GLOBAL_VARIABLES
INNODB_CMP
INNODB_CMPMEM
INNODB_CMPMEM_RESET
INNODB_CMP_RESET
INNODB_LOCKS
INNODB_LOCK_WAITS
INNODB_TRX
KEY_COLUMN_USAGE
PARAMETERS
PARTITIONS
PLUGINS
PROCESSLIST
PROFILING
REFERENTIAL_CONSTRAINTS
ROUTINES
SCHEMATA
SCHEMA_PRIVILEGES
SESSION_STATUS
SESSION_VARIABLES
STATISTICS
TABLES
TABLESPACES
Don't forget indexes, and materilized views.
Here are the catalog objects for Postgres:
administrable_role_authorizations
applicable_roles
attributes
check_constraint_routine_usage
check_constraints
column_domain_usage
column_privileges
column_udt_usage
columns
constraint_column_usage
constraint_table_usage
data_type_privileges
domain_constraints
domain_udt_usage
domains
element_types
enabled_roles
information_schema_catalog_name
key_column_usage
parameters
referential_constraints
role_column_grants
role_routine_grants
role_table_grants
role_usage_grants
routine_privileges
routines
schemata
sequences
sql_features
sql_implementation_info
sql_languages
sql_packages
sql_parts
sql_sizing
sql_sizing_profiles
table_constraints
table_privileges
tables
triggered_update_columns
triggers
usage_privileges
view_column_usage
view_routine_usage
view_table_usage
views