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The System Catalog
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contains column information in the DB2 catalog. Here are some queries that apply to this DBMS brand: Find all columns in the database with a DATE data type.
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SELECT TABSCHEMA, TABNAME, COLNAME FROM SYSCAT.COLUMNS WHERE TYPESCHEMA = 'SYSIBMD' AND TYPENAME = 'DATE';
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List the owner, view name, column name, data type, and length for all text columns longer than ten characters de ned in views.
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SELECT FROM WHERE AND AND AND AND DEFINER, COLS.TABNAME, COLNAME, TYPENAME, LENGTH SYSCAT.COLUMNS COLS, SYSCAT.TABLES TBLS TBLS.TABSCHEMA = COLS.TABSCHEMA TBLS.TABNAME = COLS.TABNAME (TYPENAME = 'VARCHAR' OR TYPENAME = 'CHARACTER') LENGTH > 10 TYPE = 'V';
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The way the column definition is provided by the system catalogs of various DBMS brands varies considerably. For comparison, Table 16-6 shows the definition of the Informix Universal Server SYSCOLUMNS table. Some of the differences between the column information in the tables are simply matters of style: The names of the columns in the two tables are completely different, even when they contain similar data. The DB2 catalog uses a combination of the schema name and table name to identify the table containing a given column; the Informix catalog uses an internal table-id number, which is a foreign key to its SYSTABLES table.
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PART IV
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Column Name COLNAME TABID COLNO COLTYPE COLLENGTH COLMIN COLMAX EXTENDED_ID SECLABLID
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Data Type VARCHAR(128) INTEGER SMALLINT SMALLINT SMALLINT INTEGER INTEGER INTEGER INTEGER
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Information Name of the column Internal table-id of table containing column Position of column in table Data type of column and whether NULLs are allowed Column length in bytes Minimum column length in bytes Maximum column length in bytes Internal ID of extended data type For projected columns, the label ID of the column s security label
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TABLE 16-6
The SYSCOLUMNS Table (Informix)
Part IV:
Database Structure
The DB2 catalog specifies data types in text form (for example, CHARACTER); the Informix catalog uses integer data type codes. Other differences reflect the different capabilities provided by the two DBMS brands: DB2 allows you to specify up to 254 characters of remarks about each column; Informix does not provide this feature. The Informix system table keeps track of the minimum and maximum length of actual data values stored in a variable-length column; this information is not available directly from the DB2 system catalog.
View Information
The definitions of the views in a database are usually stored by the DBMS in the system catalog. The DB2 catalog contains two system tables that keep track of views. The SYSCAT. VIEWS table, described in Table 16-7, contains the SQL text definition of each view. Older versions of DB2 supported SQL text up to 3600 characters, and definitions exceeding that size were stored in multiple rows, with sequence numbers 1, 2, 3, and so on. Newer versions of DB2 use a CLOB column that accommodates view definitions up to 64K in size, so only one row in the SYSCAT.VIEWS table is required for each view.
Column Name VIEWSCHEMA VIEWNAME DEFINER SEQNO VIEWCHECK
Data Type VARCHAR(128) VARCHAR(128) VARCHAR(128) SMALLINT CHAR(1)
Information Schema containing the view Name of the view User-id of person who created the view Sequence number for this row of SQL text (always 1 for DB2 UDB) Type of view checking: N = No check option L = Local check option C = Cascaded check option Whether view is read-only (Y/N) Whether view definition is valid (Y/N) Name of the default schema at the time the object was defined Path for resolving function calls in view SQL text of view definition ( SELECT ); data type VARCHAR(3600) in older versions of DB2
READONLY VALID QUALIFIER FUNC_PATH TEXT
CHAR(1) CHAR(1) VARCHAR(128) VARCHAR(254) CLOB(64K)
TABLE 16-7
The SYSCAT.VIEWS View (DB2)
16:
The System Catalog
Using this table, you can see the definitions of the views in the database. As with many mainstream DBMS products, information about views is tightly linked to the information about tables in the DB2 catalog. This means you often have more than one way to find the answer to a catalog inquiry. For example, here is a direct query against the DB2 VIEWS system table to obtain the names and creators of all views defined in the database: List the views de ned in the database.
SELECT DISTINCT VIEWSCHEMA, VIEWNAME, DEFINER FROM SYSCAT.VIEWS;
Note the use of DISTINCT to eliminate duplicate rows that would be present for views with long text definitions in older versions of DB2. Perhaps an easier way to obtain the same information is to query the DB2 TABLES system table directly, selecting only rows representing views, as indicated by the TYPE value: List the views de ned in the database.
SELECT TABSCHEMA, TABNAME, DEFINER FROM SYSCAT.TABLES WHERE TYPE = 'V';
Most of the major DBMS products treat views in this same way within their system catalog structure. Informix Universal Server, for example, has a system table named SYSVIEWS that contains view definitions. Each of its rows holds a 64-character chunk of the SQL SELECT statement that defines a view. View definitions that span multiple rows are handled by sequence numbers, as with DB2. The Informix SYSVIEWS table includes only one other column the table-id that links the SYSVIEWS table to the corresponding row in the SYSTABLES table. Thus, Informix duplicates less information between the SYSTABLES and SYSVIEWS tables, but you must explicitly join the tables for the most common view information requests. Oracle takes a similar approach by making the SQL text that defines a view available via system views. As with table and column information, three system views are of interest: USER_VIEWS, which contains information about all views created and owned by the current user; ALL_VIEWS, which contains information about views accessible to the current user; and DBA_VIEWS, which contains information about all the views in the database. The SQL text defining the view is held in a LONG (Oracle proprietary large text object data type) column and can conceivably run to many thousands of characters. A length column tells the length of the stored SQL text definition of the view. Here is a query to obtain Oracle view information: List the current user s views and their de nitions.
SELECT VIEW_NAME, TEXT_LENGTH, TEXT FROM USER_VIEWS;
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