• If this is a large tablespace, each cell of the map may represent hundreds of actual data blocks.

  • Red cells represent segments that consume a high percentage of blocks for their overall size. They may be good candidates for object rebuilds.

  • Toad measures Internal Fragmentation: a measure of the fragmentation of the object within the tablespace.

  • The actual SQL Toad uses to measure internal fragmentation can be found in the Toad FAQ, under the question "How does the Tablespace Map Work?"

  • Selected filters are cumulative, whether on the same tab or on multiple tabs. They remain in effect until you clear them.