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An alias table is a physical table with the type of alias, it is reference to a logical table

source, and mainly it is useful for reuse existing table more than once in your physical

layer, to set up multiple alias tables, each with different keys, name, or joins.Alias tables are critical in the process of converting er schemas to dimensional schemas.

1. If you delete a column in the source table the column is automatically removed

from the alias table.2. In online mode if a source table or column is checked out all its alias tables and

columns will be checked out, if an alias table or column is checked out, its source

table and column will be checked out.3. The deletion fails if an alias exists on the physical table.

4. It is generally safe to change a non null able value to a null able value in a

physical column.

5. Specify a primary key for physical tables in the physical table properties click thekeys tab specify keys.

6. set up unbalanced hierarchies in the physical layer by changing the hierarchy type

7. A catalog contains the entire schema for a database object; a schema contains

only the metadata information for a particular user or application.8. You would initialize a session variable named client, for example that could be

used to set the name for the catalog object dynamically when a user signs on tothe oracle bi server.

9. When you import keys in a physical schema, the primary key-foreign key joins

are automatically defined.

10. Multi database joins will be significantly slower than joins between tables withingthe same database.

11. Fragmented data is data from a single domain that is split between multiple tables,

for example a database might store sales data for customers with last namesbeginning with the letter a through m in one table and last names from n through z

in another table, you need to define all of the join conditions between eachfragment and all the tables it relates to.12. A primary key and foreign key relationship defines a one to many relationship

between two tables, a foreign key is column or a set of columns in one table that

references the primary key columns in another table.13. complex joins in physical later of the repository , complex joins are joins over non

foreign key and primary key columns you can specify expressions and the

specific columns on which to create the join , complex join in BMM layer

expressions are not necessary.14. An opaque view is a physical layer table that consists of a select statement., you

deploy an opaque view in the physical database using the deploy views utility.

15. The business model and mapping layer of the administration tool defines thebusiness or logical model of the data and specifies the mapping between the

business model and the physical layer schemas.

16. When you work in a repository in offline mode remember to save your repositoryfrom time to time. You can save a repository in offline mode even though the

business models may be inconsistent.

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17. Logical tables exist in the business model and mapping layer, the logical schema

defined in each business model needs to contain at least two logical tables

sources, and configure the logical keys (primary and foreign)18. After creating tables in the business model and mapping layer , you specify a

primary key for each table, logical dimension tables must have a logical primary

key ,logical keys can be composed of one or more logical columns.19. Logical keys are optional for logical fact tables, do no specify logical keys for

logical fact tables.

20. Default aggregation rule is count distinct.21. Level based measures allow a single query to return data at multiple levels of

aggregation.

22. NQSConfig.INI file tells allows the oracle bi server t load the repository into

memory upon startup, if errors occur in the file you might not be able to restartthe server you can review the log messages in the log nqserver.log at the

oraclebi\server\log,

23. start in nqsconfig.ini file is logical name is the name end-users have to configure

when configuring a dsn in the oracle bi odbc setup wizard.24.