What is DESC command in Oracle?

Description. Provides a decription of the specified table or view. For a list of tables in the current schema, use the Show Tables command. For a list of views in the current schema, use the Show Views command.

What is V session command?

V$SESSION displays session information for each current session. Guarantees that session-level commands are applied to the correct session objects if the session ends and another session begins with the same session ID.

When DESC command is used in Oracle?

The DESCRIBE command enables you to describe objects recursively to the depth level set in the SET DESCRIBE command. You can also display the line number and indentation of the attribute or column name when an object contains multiple object types.

What is V Sql_monitor?

V$SQL_MONITOR displays SQL statements whose execution have been (or are being) monitored by Oracle. An entry is created in V$SQL_MONITOR every time the execution of a SQL statement is being monitored.

What is the difference between GV session and V session?

V$ views contain statistics for one instance, whereas GV$ views contain information from all the active instances. Each GV$ view contains an INST_ID column of type NUMBER, which can be used to identify the instance associated with the row data.

What is a session Oracle?

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.

What is SQL Tuning Advisor in Oracle 11g?

The SQL Tuning Advisor provides advice in the form of precise SQL actions for tuning the SQL statements along with their expected performance benefits. Oracle Database can automatically tune SQL statements by identifying problematic SQL statements and implementing tuning recommendations using the SQL Tuning Advisor.

How do I connect to Oracle database?

Connecting to Oracle Database from SQL*Plus

  1. If you are on a Windows system, display a Windows command prompt.
  2. At the command prompt, type sqlplus and press the key Enter. SQL*Plus starts and prompts you for your user name.
  3. Type your user name and press the key Enter.
  4. Type your password and press the key Enter.