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SQL select * from Employee 2 / ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION ---- ---------- ---------- --------- --------- ---------- ---------- --------------- 01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected.Advanced Index Compression works well on all supported indexes, including those indexes that are not good candidates for the existing prefix compression feature; including indexes with no, or few, duplicate values in the leading columns of the index.This directive applies to any kind of direct path operation, such as a bulk insert or a move operation.Storing data that logically belongs together in close physical proximity can greatly reduce the amount of data to be processed and can lead to better compression ratios.This big table cache provides significant performance improvements for full table scans on tables that do not fit entirely into the buffer cache.

We also saw that Oracle made no attempt to “ re-compress” the row after update even if there were other preexisting tokens that could be used to reduce the size of the row.

If the user did not specify any value, the application can attempt to insert an empty string ('') to the numeric column.

Oracle allows you to use a string literal containing a numeric value to insert data into a NUMBER column without explicit data type casting.

The recommended way to populate the Physical layer is by importing metadata from databases and other data sources.

The data sources can be of the same or different varieties.