How To Determine Data Size Of A Table

[newbie]

to find actual size of a table:
select count (distinct substr(rowid,1,15)) from schema.table_name

explanation:
each rowid references a block. Sum of all the distinct blocks give you the actual table size.

HTH

[davey23uk]

so hows is a COUNT = to a SUM

you query wil return the number of rows

[slimdave]

to find actual size of a table:
select count (distinct substr(rowid,1,15)) from schema.table_name

explanation:
each rowid references a block. Sum of all the distinct blocks give you the actual table size.

HTH

Migrated and chained rows?

[newbie]

Migrated and chained rows?

The method I presented is the table size in Oracle blocks -- that would exclude all empty blocks below the HWM. IMHO, I would consider any block that contains the pointer or the actual migrated/chained rows as non-empty data blocks.

so hows is a COUNT = to a SUM

you query wil return the number of rows?

Sorry for my poor usage. SUM in this context is the result of the query presented not the function SUM in oracle.