An index can be created in a table to find data more quickly and efficiently. The users cannot see the indexes, they are just used to speed up searches/queries.Indexes are objects in the database that provide a mapping of all the values in a table column, along with the ROWID(s) for all rows in the […]
The objects in Oracle you create are available only in your schema unless you grant access to the objects explicitly to other users. We’ll discuss privileges and user access in the next section. However, even when you grant permission to other users for using an object, the boundary created by schema ownership will force other […]
A sequence is a database object that generates integers according to rules specified at the time the sequence is created. A sequence automatically generates unique numbers and is sharable between different users in Oracle. Sequences have many purposes in database systems—the most common of which is to generate primary keys automatically. However, nothing binds a […]
Some of the objects that are part of the relational database produced by Oracle and that are used in the functions just mentioned are as follows: Tables, views, and synonyms Used to store and access data. Tables are the basic unit of storage in Oracle. Views logically represent subsets of data from one or more […]
One of the great benefits Oracle provides you is the ability to make changes in database using SQL statements and then decide later whether we want to save or discard them. Oracle enables you to execute a series of data-change statements together as one logical unit of work, called a transaction, that’s terminated when you […]
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