How can I check the size and usage of a table in Oracle?
To check the size and usage of an Oracle table, you can use the following methods:
- By using Oracle’s built-in data dictionary views, you can query the following data dictionary views to get information on the size and usage of tables:
- DBA_TABLES: Contains information about all tables, including table name, owner, tablespace, number of rows, number of blocks, etc.
- DBA_SEGMENTS stores segment information for all objects in the database, including tables, indexes, etc. You can filter by table name to retrieve specific table segment information. You can query the BYTES column to get the size of the table.
- DBA_EXTENTS contains extension information for all objects in the database, and you can obtain extension information for a specific table by filtering the table name. You can query the BYTES column to obtain the size of the table.
- DBA_TAB_MODIFICATIONS: Contains information on the number of modifications made to a table. You can query the INSERTS, UPDATES, and DELETES columns to get insights into the table’s activity.
- By utilizing Oracle’s performance monitoring tools such as Enterprise Manager and Oracle SQL Developer, users can easily view the size and usage of tables. These tools typically offer a visual interface for more convenient viewing and analysis of table information.
- Third-party tools can also be utilized to view the size and usage of tables, such as Toad for Oracle, SQL Developer, and others. These tools offer additional features and options for a more detailed analysis of table information.
It is important to note that the size and usage of a table can be influenced by various factors such as indexes, partitions, compression, etc. Therefore, when reviewing the size and usage of a table, it is necessary to take these factors into consideration.
