In Oracle Enterprise Manager, in "Performance > Top Activity", you can click a SQL that is being executed and then go to the Plan tab to see SQL execution plan.
For the execution plan, the Enterprise Manager shows a table with the execution plan steps. That table has the following columns:
Operation Object Object Type Order Rows Size (KB) Cost Time (sec) CPU Cost I/O Cost
I'd like to understand the meaning of each one of these columns, but I did not find any documentation on this.
Can you recommend me any document or explain the meaning of the columns?