Tag Archives: Performance Tuning

Determine the size of all the tables in an Oracle database schema

By | November 11, 2026

Finding the true size of tables in Oracle Database can be significantly more nuanced than in other relational database systems. Unlike PostgreSQL (with pg_total_relation_size) or MySQL, Oracle manages physical storage through a hierarchy of blocks, extents, and segments spread across tablespaces. If you simply query USER_TABLES or sum USER_SEGMENTS for segment_type = ‘TABLE’, you are… Read More: Determine the size of all the tables in an Oracle… »