Initial Setup for Managing Maps | Teradata Vantage - 17.00 - 17.05 - Initial Setup for Managing Maps - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - Database Administration

Product
Advanced SQL Engine
Teradata Database
Release Number
17.00
17.05
Published
June 2020
Language
English (United States)
Last Update
2021-01-22
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rgu1556127906220.ditamap
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lze1555437562152.ditaval
There are prerequisites for using maps to distribute table data across AMPs:
  • User DBC must grant the LOGON privilege to user TDMaps. TDMaps is a system database that contains the information and SQL stored procedures used for managing maps.
  • After the first logon to TDMaps (the initial password is tdmapsadmin), change the password for TDMaps.
  • Give TDMaps enough space to store rows in the ActionsTbl and ActionHistoryTbl. A rough guideline is the size of TVM. The following example determines the size of TVM:
    SELECT SUM(CurrentPerm) FROM DBC.TableSizeV WHERE TableName='TVM';
  • Grant DBAs privileges on TDMaps:
    • To grant the use of TDMaps procedures:
      GRANT EXECUTE PROCEDURE ON TDMaps TO <User>;
    • To grant the ability to query TDMaps tables:
      GRANT SELECT ON TDMaps TO <User>;
    • To grant the ability to modify TDMaps tables:
      GRANT INSERT, UPDATE, DELETE ON TDMaps TO <User>;
  • Grant DBAs privileges on maps:
    • To grant the privileges to create and drop maps, for example:
      GRANT CREATE MAP TO Roger WITH GRANT OPTION;
      GRANT DROP MAP TO Roger WITH GRANT OPTION;
    • To grant the existing contiguous or spare map to a user or role, for example:
      GRANT MAP SomeMapName TO Roger WITH GRANT OPTION;
      Maps must be granted before they can be used in an SQL statement. This requirement does not apply to default maps.

When a user creates a map, the user is granted that map by default. User TDMaps is automatically granted the default sparse maps.