Basic: what is the dollar sign ($) to an average of name of column?

Periodically, I see dollar signs in the column names in the Oracle tables. For example, when I create a LOB, the LOB segment often ends in a dollar sign (or two). Sometimes when a developer creates an object, I see some of the field namess have dollar signs at the end of their.

What is the dollar sign?

Which means two dollar signs?

Just curious... they seem to function as normal characters.

These are normal characters. But Oracle (and other vendors) frequently use characters such as $ who normally do not use normal developers to create agreements around table names.

For example, Oracle provides a number of data dictionary tables that use x$, v$ and gv$ as prefixes. There is nothing inherently special about these prefixes. But they convey useful information for users of these systems (x$ views are undocumented, v$ views provide information about activity on the local instance, gv$ views provide information about the activity on all instances of a RAC cluster). And using these sorts of prefixes prevents confusion between the tables of the application and the Oracle tables. Many applications, for example, have a table in a SESSION. With the prefix $ V for the Oracle format V$ SESSION table makes it easy confusion to have two tables with the same named.

Justin

Tags: Database

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