15th October, 2020
Ans: FastLoad uses multiple sessions to quickly load large amounts of data on an empty table. MultiLoad is used for high-volume maintenance on tables and views. It works with non-empty tables also. A maximum of 5 tables can be used in MultiLoad.
Ans: The Primary Index mechanism is the ideal type of index for the data warehouse.
Ans: Online Analytical Processing, a category of software tools that provides an analysis of data stored in a database. OLAP tools enable users to analyze different dimensions of multidimensional data. For example, it provides a time series and trend analysis views. The chief component of OLAP is the OLAP server, which sits between a client and a database management system (DBMS). The OLAP server understands how data is organized in the database and has special functions analyzing the data.
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Ans: Creating a secondary index causes Teradata to build a sub-table to contain its index rows, thus adding another set of rows that requires updating each time a table row is inserted, deleted, or updated. Secondary index sub-tables are also duplicated whenever a table is defined with FALLBACK, so the maintenance overhead is effectively doubled.
Ans: The AMP vproc manages Teradata Database interactions with the disk subsystem. Each AMP manages a share of the disk storage.
Ans: Following are the limitations of Teradata TPUMP Utility:
Ans: Create table Customer dummy as Customer with data / with no data.
Ans: FALLBACK requests that a second copy of each row inserted into a table be stored on another AMP in the same cluster. This is done when AMP goes down or disk fails.
Ans: An index is a mechanism that can be used by the SQL query optimizer to make table access more performant. Indexes enhance data access by providing a more or less direct path to stored data and avoiding the necessity to perform full table scans to locate the small number of rows you typically want to retrieve or update.
Ans: .Logon tdipid/username, password.
Ans: SUBSTRING (string_expression, n1 [n2])
Ans: Yes. When a case has to be selected depending upon the value of the expression.
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