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Each table in the system catalog contains information about a single kind of structural element in the database. Although the details vary, almost all commercial SQL products include system tables that describe each of these five entities: Tables The tables catalog describes each table in the database, identifying its table name, its owner, the number of columns it contains, its size, and so on. Columns The columns catalog describes each column in the database, giving the column s name, the table to which it belongs, its data type, its size, whether NULLs are allowed, and so on. Users The users catalog describes each authorized database user, including the user s name, an encrypted form of the user s password, and other data.
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Views The views catalog describes each view defined in the database, including its name, the name of its owner, the query that defines the view, and so on. Privileges The privileges catalog describes each set of privileges granted in the database, including the names of the grantor and grantee, the privileges granted, the object on which the privileges have been granted, and so on. Table 16-1 shows the names of the system tables and/or views that provide this information in each of the major SQL-based DBMS products. (Note that MySQL supports the
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DBMS DB21 Tables SCHEMATA TABLES REFERENCES TABOPTIONS TABDEP Oracle2 CATALOG OBJECTS TABLES SYNONYMS Informix SYSTABLES SYSREFERENCES SYSSYNONYMS Sybase SYSDATABASES SYSOBJECTS SYSKEYS SQL Server
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Privileges DBAUTH SCHEMAAUTH TABAUTH COLAUTH
TAB_COLUMNS TAB_COLS LOBS
USERS
VIEWS
TAB_PRIVS COL_PRIVS SYS_PRIVS
SYSCOLUMNS
SYSUSERS
SYSVIEWS SYSDEPEND
SYSTABAUTH SYSCOLAUTH
SYSCOLUMNS
SYSUSERS
SYSOBJECTS SYSCOMMENTS
DATABASES OBJECTS FOREIGN_KEYS REFERENCES
COLUMNS FOREIGN_KEY_ COLUMNS IDENTITY_ COLUMNS
DATABASE_ PRINCIPALS SQL_LOGINS
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DATABASE_ PERMISSIONS
DB2 tables have the qualifier SYSCAT (for example, SYSCAT.TABLES). Oracle provides three versions of many of its catalog views, prefixed by ALL_, DBA_, or USER_ (for example, ALL_ TABLES, DBA_TABLES, and USER_TABLES). The ALL_ version shows all objects to which the current user has access, the DBA_ version shows all objects in the entire database, and the USER_ version shows only objects owned by the current user. SQL Server catalog views have the qualifier SYS (for example, SYS.DATABASES). Starting with SQL Server 2000, system tables were deprecated in favor of newly added catalog views.
TABLE 16-1
Selected System Tables in Popular SQL-Based Products
16:
The System Catalog
Information Schema described later in this chapter.) The remainder of this topic describes some typical system tables in more detail and gives examples of system catalog access. Because of the wide variations in system catalogs among DBMS brands, a complete description of the system catalogs and complete examples for all of the major DBMS brands is beyond the scope of this book. With the information provided here, you should be able to consult the system documentation for your DBMS brand and construct the appropriate system catalog queries.
Table Information
Each of the major SQL products has a system table or view that keeps track of the tables in the database. In DB2, for example, this information is provided by a system catalog view named SYSCAT.TABLES. (All of the DB2 system catalog views are part of a schema named SYSCAT, so they all have qualified table/view names of the form SYSCAT.XXX.) Table 16-2 shows some of the columns of the SYSCAT.TABLES view. It contains one row for each table, view, or alias defined in the database. The information in this view is typical of that provided by the corresponding views in other major DBMS products.
Column Name TABSCHEMA TABNAME DEFINER TYPE Data Type VARCHAR(128) VARCHAR(128) VARCHAR(128) CHAR(1) Information Schema containing the table, view, or alias Name of the table, view, or alias User-id of table/view/alias creator A = Alias, H = Hierarchy table, N = Nickname, S = Materialized query, T = Table, U = Typed table, V = View, W = Typed view
PART IV
STATUS
CHAR(1)
The status of the object (system use). For example, a status of check pending means that referential integrity is in doubt. N = No rule, R = Restrict rule, applies on drop Schema of base table referenced by an alias Name of base table referenced by an alias Schema name for the rowtype of this table Rowtype name of this table Time of object creation Time when last statistics computed Number of columns in table Internal table-id number ID of primary tablespace for this table Number of rows in table (cardinality) Number of disk pages containing table data
DROPRULE BASE_TABSCHEMA BASE_TABNAME ROWTYPESCHEMA ROWTYPENAME CREATE_TIME STATS_TIME COLCOUNT TABLEID TBSPACEID CARD NPAGES
TABLE 16-2
CHAR(1) VARCHAR(128) VARCHAR(128) VARCHAR(128) VARCHAR(18) TIMESTAMP TIMESTAMP SMALLINT SMALLINT SMALLINT INTEGER INTEGER
Selected Columns of the SYSCAT.TABLES View (DB2) (continued)
Part IV:
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