SAS DICTIONARY Tables in V9.2 Very useful-经管之家官网！

DICTIONARY Tables and Associated SASHELP Views

DICTIONARY Table	SASHELP View	Description
CATALOGS	VCATALG	Contains information about known SAS catalogs.
CHECK_CONSTRAINTS	VCHKCON	Contains information about known check constraints.
COLUMNS	VCOLUMN	Contains information about columns in all known tables.
CONSTRAINT_COLUMN_USAGE	VCNCOLU	Contains information about columns that are referred to by integrityconstraints.
CONSTRAINT_TABLE_USAGE	VCNTABU	Contains information about tables that have integrity constraints definedon them.
DATAITEMS	VDATAIT	Contains information about known information map data items.
DESTINATIONS	VDEST	Contains information about known ODS destinations.
DICTIONARIES	VDCTNRY	Contains information about all DICTIONARY tables.
ENGINES	VENGINE	Contains information about SAS engines.
EXTFILES	VEXTFL	Contains information about known external files.
FILTERS	VFILTER	Contains information about known information map filters.
FORMATS	VFORMATVCFORMAT	Contains information about currently accessible formats and informats.
FUNCTIONS	VFUNC	Contains information about currently accessible functions.
GOPTIONS	VGOPTVALLOPT	Contains information about currently defined graphics options (SAS/GRAPHsoftware). SASHELP.VALLOPT includes SAS system options as well as graphicsoptions.
INDEXES	VINDEX	Contains information about known indexes.
INFOMAPS	VINFOMP	Contains information about known information maps.
LIBNAMES	VLIBNAM	Contains information about currently defined SAS libraries.
MACROS	VMACRO	Contains information about currently defined macro variables.
MEMBERS	VMEMBERVSACCES VSCATLG VSLIB VSTABLE VSTABVW VSVIEW	Contains information about all objects that are in currently definedSAS libraries. SASHELP.VMEMBER contains information for all member types;the other SASHELP views are specific to particular member types (such as tablesor views).
OPTIONS	VOPTIONVALLOPT	Contains information about SAS system options. SASHELP.VALLOPT includesgraphics options as well as SAS system options.
REFERENTIAL_CONSTRAINTS	VREFCON	Contains information about referential constraints.
REMEMBER	VREMEMB	Contains information about known remembers.
STYLES	VSTYLE	Contains information about known ODS styles.
TABLE_CONSTRAINTS	VTABCON	Contains information about integrity constraints in all known tables.
TABLES	VTABLE	Contains information about known tables.
TITLES	VTITLE	Contains information about currently defined titles and footnotes.
VIEWS	VVIEW	Contains information about known data views.

There are many newly added table. Here is a example to retrieve information from it.
Proc SQL;
describe table Dictionary.tables ;
select name, type
from Dictionary.columns
wherelibname='SASHELP' and memname='CLASS';
quit;
proc print data =sashelp.vcolumn;
where libname='SASHELP' and memname='CLASS';
run;