- From an administrative client, log on as user DBC.
- Create the database administrator as follows:
|User Name||Required. The name of the database administrator user.
All administrative procedures in this publication use the name DBADM for the principal administrator.
|Owner||The owner of user DBADM, which is DBC.|
|Password||Required. The temporary password for DBADM.
Recommendation: Any simple password will work that follows the default system password controls. Each user is prompted to change the temporary password to a permanent, private password at first logon.
Be sure to review the default password control values to determine whether they conform to your site security requirements.
For information on password control options, see Security Administration.
|Permanent Space||Required. The space in bytes that contains all objects that user DBADM creates or owns.
Perm space can also be specified with a constant expression resulting in a numeric value in bytes. This allows you to specify perm space per AMP, which is useful when porting applications from a smaller test system to a production system. See the example below.
Because user DBADM will create and own nearly all Teradata databases and tables, assign it the majority of space on the system.
Recommendation: 60-65% of available system (DBC) space.
|Spool Space||Optional. The spool space specification is only a limit to the amount of space available for intermediate query results or formatted answer sets to queries and volatile tables. The system borrows spool space for a user from unused permanent space anywhere in the system.
Spool space can also be specified with a constant expression resulting in a numeric value in bytes. This allows you to specify spool space per AMP, which is useful when porting applications from a smaller test system to a production system. See the example below.
Recommendation:Spool space specification is not normally needed. Spool is already allocated in the DBADM profile.
|Default Database||Optional. The user or database containing the space in which the Teradata Database stores or searches for new or target objects unless a different database is specified in the transaction SQL.
Recommendation: Specify DBADM.
|Profile||Required. The name of the profile in which the user has membership. A user can be a member of only one profile.
Recommendation: Enter DBADM, the profile created for user DBADMIN in Creating the DBADM Profile.
|FALLBACK||Optional. Specification of FALLBACK automatically creates a duplicate of each table stored in the user space, in addition to the duplicates already created by disk mirroring, to which the system can revert in the event of a failure.
Recommendation: Uncheck Fallback. FALLBACK is only recommended for individual mission-critical tables or tables so large that their size prevents timely backup to tape or external disk.
CREATE USER "DBADM" FROM "DBC" AS PERM = 2e5 * (hashamp() + 1) PASSWORD = "temp" SPOOL = spool_space PROFILE = DBADM STARTUP = '' NO FALLBACK NO BEFORE JOURNAL NO AFTER JOURNAL;
The hashamp() function is a database built-in function that returns the highest AMP number in the system configuration. Because AMP numbers start from zero, (hashamp() + 1) returns the total number of AMPs in the system. The example expression: 2e5 * (hashamp() + 1) means allocate 200,000 bytes on each AMP for perm or spool space for the user or database.
Keep the client application open for use in the Granting Database Privileges to User DBADM.
Reference topics are arranged according to the first step in which the topic appears.
|Step||Topic||Resource for Further Information|
|2||User types and characteristics||Chapter 5: “Creating Users and Granting Privileges,” in Security Administration|
|Syntax and options for the CREATE USER statement||SQL Data Definition Language Syntax and Examples|
|Guidelines for managing of space||Managing Space: Operational DBAs|
|The default password control values and how to change them||Chapter 6: “Managing Database Passwords,” in Security Administration|