#table remarksSYSTEM_ALIASES=the aliases defined within this databaseSYSTEM_BESTROWIDENTIFIER=for each accessible table defined within this database, the optimal set of visible columns that uniquely identifies a rowSYSTEM_BYTECODE=the Java bytecode instruction source listing of the Java methods providing implementation for each accessible callable procedure, SQL function, trigger body and UDT method defined within this databaseSYSTEM_CATALOGS=the accessible catalogs defined within this databaseSYSTEM_CACHEINFO=the current state of the system row caching mechanismSYSTEM_CLASSPRIVILEGES=the visible user level access permissions for each Java class providing implementation for each accessible callable procedure, SQL function, trigger body and UDT method defined within this databaseSYSTEM_COLUMNPRIVILEGES=the visible user level access permissions of each visible column of each accessible table defined within this databaseSYSTEM_COLUMNS=the visible columns of each accessible table defined within this databaseSYSTEM_CROSSREFERENCE=a description of how the accessible tables defined within this database import visible columns to enforce referential integritySYSTEM_LOBS=LOB storage for Java resources defined within this databaseSYSTEM_INDEXINFO=information about the indicies of each accessible table defined within this databaseSYSTEM_PROPERTIES=the static and dynamic system properties and operating parameters of this databaseSYSTEM_PRIMARYKEYS=the visible columns of the primary key of each accessible table defined within this databaseSYSTEM_PROCEDURECOLUMNS=a description of the return type, parameters and result columns of each accessible callable procedure, SQL function, trigger body and UDT method defined within this databaseSYSTEM_PROCEDURES=the procedures, SQL functions, trigger body routines and UDT methods defined within the databaseSYSTEM_SCHEMAS=the accessible schemas defined within this databaseSYSTEM_SESSIONS=the visible sessions open in this databaseSYSTEM_SESSIONINFO=information about the current database sessionSYSTEM_SUPERTYPES=the user-defined type (UDT) hierarchies defined in this database. Only the immediate super type/sub type relationship is modeledSYSTEM_SUPERTABLES=the table hierarchies defined in this database. Only the immediate super type/sub type relationship is modeledSYSTEM_TABLEPRIVILEGES=the visible user level access permissions for each accessible table defined within this databaseSYSTEM_TABLES=the accessible tables defined within this databaseSYSTEM_TABLETYPES=the types of tables that can be created/found within this databaseSYSTEM_TEXTTABLES=the data source descriptors of the accessible TEXT TABLE objects defined within this databaseSYSTEM_TRIGGERS=the visible triggers defined within this databaseSYSTEM_TRIGGERCOLUMNS=the column usage of visible triggers defined within this databaseSYSTEM_TYPEINFO=a description of predefined table column data types known to this databaseSYSTEM_ALLTYPEINFO=a description of all non user-defined data types known to this database and the level of support for them in various capacitiesSYSTEM_UDTS=the user-defined types that are available within this databaseSYSTEM_UDTATTRIBUTES=a description of the attributes of the user-defined types (UDTs) that are available in this databaseSYSTEM_USERS=users defined within this databaseSYSTEM_VERSIONCOLUMNS=the visible columns of the accessible tables that are automatically updated when any value in a row is updatedSYSTEM_VIEWS=the view descriptors of the accessible views defined within this database# since 1.7.2 RC1SYSTEM_CHECK_COLUMN_USAGE=one row for each column identified by a <column reference> contained in the <search condition> of a check constraint, domain constraint, or assertion.SYSTEM_CHECK_ROUTINE_USAGE=one row for each SQL-invoked routine identified as the subject routine of either a <routine invocation>, a <method reference>, a  <method invocation>, or a <static method invocation>  contained in an <assertion definition>, a <domain constraint>, or a <table constraint definition>.SYSTEM_CHECK_CONSTRAINTS=one row for each domain constraint, table check constraint, and assertion.SYSTEM_CHECK_TABLE_USAGE=one row for each table identified by a <table name> simply contained in a <table reference> contained in the <search condition> of a check constraint, domain constraint, or assertion.SYSTEM_SEQUENCES=one row for each external sequence generatorSYSTEM_TABLE_CONSTRAINTS=one row for each table constraint associated with a tableSYSTEM_USAGE_PRIVILEGES=one row for each usage privilege descriptor.SYSTEM_VIEW_COLUMN_USAGE=one row for each column of a table that is explicitly or implicitly referenced in the <query expression> of the view being described.SYSTEM_VIEW_ROUTINE_USAGE=one row for each SQL-invoked routine identified as the subject routine of either a <routine invocation>, a <method reference>, a <method invocation>, or a <static method invocation> contained in a <view definition>SYSTEM_VIEW_TABLE_USAGE=one row for each table identified by a <table name> simply contained in a <table reference> that is contained in the <query expression> of a view# since 1.8.0SYSTEM_AUTHORIZATIONS=one row for each user and one row for each role SYSTEM_COLLATIONS=one row for each character collation descriptor.SYSTEM_ROLE_AUTHORIZATION_DESCRIPTORS=one row for each role granted directly to a granteeSYSTEM_SCHEMATA=one row for each schema.