What is an Oracle session?

A session consists of every connection to the Oracle database by a user from a specific process. By tracking the number of Oracle sessions, we can track how busy a particular server is. This gives insight on how loaded an Oracle Database is. It also helps understand which users take more system resources.

Is alter session a DDL?

The DDL commands CREATE, ALTER, and DROP require exclusive access to the object you’re working on. However, the GRANT, REVOKE, ANALYZE, and AUDIT commands do not.

What is NLS language in Oracle?

Oracle’s National Language Support (NLS) architecture allows you to store, process, and retrieve data in native languages. It ensures that database utilities and error messages, sort order, date, time, monetary, numeric, and calendar conventions automatically adapt to the native language and locale.

What is difference between session and process in Oracle?

So a process is a process and a session is a session. A session eventually needs a process, is not tied to a single process. A process can have zero one or more sessions using it.

What is a session in SQL?

A SQL session is an occurrence of a user interacting with a relational database through the use of SQL commands. When a user initially connects to the database, a session is established.

What is difference between session and connection?

Literally : Connection is Physical Communication Channel and Session is a state of information exchange. A Connection may have multiple sessions . The connection is the physical communication channel between SQL Server and the application: the TCP socket, the named pipe, the shared memory region.

What is DDL and TCL?

DDL – Data Definition Language. DML – Data Manipulation Language. DCL – Data Control Language. TCL – Transaction Control Language.

Is truncate a DDL or DML?

DDL statement
Although TRUNCATE TABLE is similar to DELETE , it is classified as a DDL statement rather than a DML statement. It differs from DELETE in the following ways: Truncate operations drop and re-create the table, which is much faster than deleting rows one by one, particularly for large tables.

What is Nls_territory?

NLS_TERRITORY specifies the name of the territory whose conventions are to be followed for day and week numbering. This parameter also establishes the default date format, the default decimal character and group separator, and the default ISO and local currency symbols.

What is the difference between transaction and session?

A session is what you use to interact with the database. A transaction is used to specify boundaries for the session to operate within. Essentially, transactions prevent the database from being corrupted by only allowing a session to interact with it at one time.