How to get size of all tables in an Oracle database schema

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If you ever wanted to know how what’s taking space in an Oracle database, or how large is the table you’re working on, here’s a script which answers these questions. It shows the size of all the database objects large than 10 Mb in a particular database schema.

The following columns are returned:

  • Owner schema.
  • Object name and type (INDEX, TABLE, etc.).
  • Name of the table this object is associated with. E.g. indexes are associated with their parent tables.
  • Database space occupied by the object in megabytes.
  • Tablespace this object is in.
  • Number of extents allocated for the object.
  • Size of the initial extent in bytes.
  • Total database size occupied by the parent table. E.g. for indexes it will be the size of the parent * table plus sizes of all the indexes on that table.

This script is based on the Stackoverflow.com discussion.