when sp_showplan is applied for a spid , i got the below information and i am unable to understand what the following statement tell us and also other information
Total estimated I/O cost for statement 2 (at line 1): 1486860

could any one elaborate this for me.
Thanks


SQL Text: SELECT T129.C1 FROM T129 WHERE (T129.C536870926 = 'GSP000012173076') ORDER BY 1 ASC
Subordinate SQL Text: SELECT T129.C1 FROM T129 WHERE (T129.C536870926 = @@@V0_VARCHAR) ORDER BY 1 ASC

QUERY PLAN FOR STATEMENT 2 (at line 1).

2 operator(s) under root


The type of query is SELECT.

ROOT:EMIT Operator

|SORT Operator
| Using Worktable1 for internal storage.
|
| |SCAN Operator
| | FROM TABLE
| | T129
| | Index : I129_536870926_1
| | Forward Scan.
| | Positioning by key.
| | Keys are:
| | C536870926 ASC
| | Using I/O Size 16 Kbytes for index leaf pages.
| | With LRU Buffer Replacement Strategy for index leaf pages.
| | Using I/O Size 16 Kbytes for data pages.
| | With LRU Buffer Replacement Strategy for data pages.


Total estimated I/O cost for statement 2 (at line 1): 1486860.(return status = 0)