Within an Oracle database, a tablespace is a logical storage unit composed of one or more data files. Different types of Oracle database objects, such as tables, indexes, and temporary segments, can reside in a tablespace. Checking the tablespace is crucial because it helps the database administrator (DBA) monitor the space usage, identify potential issues, and ensure optimal performance of the database.
There are several ways to check tablespace in Oracle, including using Oracle Enterprise Manager, SQL queries, and operating system commands. Oracle Enterprise Manager provides a graphical user interface (GUI) that allows DBAs to easily view and manage tablespaces, including their size, usage, and status. SQL queries can also be used to retrieve information about tablespaces, such as the following query that displays the size and usage of all tablespaces in the database:
SELECT tablespace_name, total_space, ROUND((used_space / total_space) * 100, 2) AS pct_used FROM dba_tablespaces;