What is the use of synonyms in SQL?
A synonym is a database object that serves the following purposes: Provides an alternative name for another database object, referred to as the base object, that can exist on a local or remote server.
What is a synonym in Oracle database?
A synonym is an alternative name for objects such as tables, views, sequences, stored procedures, and other database objects. You generally use synonyms when you are granting access to an object from another schema and you don’t want the users to have to worry about knowing which schema owns the object.
Can we create synonym on view?
You can create a synonym for a table or a view that doesn’t exist, but the target table or view must be present before the synonym can be used. Synonyms share the same namespace as tables or views. You cannot create a synonym with the same name as a table that already exists in the same schema.
What is private synonym in Oracle?
Synonyms can be public or private. A public synonym is accessible to every user in a database and owned by a specified group named PUBLIC while a private synonym is stored a specific schema owned by a specific user and available only to that user.
When do you use synonyms in a database?
Using synonyms might spare you the agony of rewriting old code, sometimes from multiple sources, which has its own ideas of the table or database names. I have seen, for example, a code which was written for some production server.
What should be the name of a synonym in SQL?
The Synonym, like any other database object, should belong to a database schema and should be provided a unique name that follows the T-SQL identifiers rules. The naming convention rules can be also applied to the Synonym, such as using a prefix or suffix with the Synonym name to make it easy to recognize that the database object is a Synonym.
What happens when a synonym is changed in a database?
Synonym changes are also transparent from the client application perspective, as no change required from the client side if the Synonym is changed to reference a different database object, as long as the column names are not changed. Assume that you plan to change the name of a database object that is used heavily in your queries.
How to simplify database object usage with synonyms?
You can benefit from Synonyms by providing backward compatibility for the database objects that are used by legacy systems in case you drop or rename that objects. It may be found to be very simple from the definition, but for database administrators and developers, it would be very useful and simplify their jobs if it is used in a correct way.