Explain me about cost in explain plan.

Hi All,
Please explain me about cost in explain plan.
Below is my explan plans
1. first plan showing cost is more but query is returing the result very fast (564 msecs ) --- local database.
2. second plan showing less cost but result is very slow (14 secs) .
1. local database.
PLAN_TABLE_OUTPUT
| ID | Operation                         | NAME                      | ROWS | Bytes | COST |
|   0 | SELECT STATEMENT                  |                           |    17 | 2312 |    60 |
|   1 | SORT UNIQUE                      |                           |    17 | 2312 |    59 |
|   2 |   COUNT STOPKEY                   |                           |       |       |       |
|   3 |    NESTED LOOPS                   |                           |    17 | 2312 |    58 |
|   4 |     MAT_VIEW ACCESS BY INDEX ROWID| MV_EDECO_ESONGS           |    17 | 1326 |    24 |
|   5 |      INDEX RANGE SCAN             | IDX_ESNG_REG_TITLE        |    21 |       |     3 |
|   6 |     TABLE ACCESS BY INDEX ROWID   | MV_EDECO_ESONGS_TERR_CTRY |     1 |    58 |     2 |
|   7 |      INDEX UNIQUE SCAN            | IDX_ESNG_TERR_ESNG_ID_1   |     1 |       |     1 |
PLAN_TABLE_OUTPUT
| ID | Operation                         | NAME                       | ROWS | Bytes | COST |
|   0 | SELECT STATEMENT                  |                            |     9 | 1260 |    34 |
|   1 | SORT UNIQUE                      |                            |     9 | 1260 |    33 |
|   2 |   COUNT STOPKEY                   |                            |       |       |       |
|   3 |    NESTED LOOPS                   |                            |     9 | 1260 |    32 |
|   4 |     MAT_VIEW ACCESS BY INDEX ROWID| MV_EDECO_ESONGS            |     9 |   720 |    14 |
|   5 |      INDEX RANGE SCAN             | IDX_ESNG_REG_TITLE         |    11 |       |     3 |
|   6 |     MAT_VIEW ACCESS BY INDEX ROWID| MV_EDECO_ESONGS_TERR_CTRY |     1 |    60 |     2 |
|   7 |      INDEX UNIQUE SCAN            | PK_EDESONGSTERCTRY_ESONGID |     1 |       |     1 |
------------------------------------------------------------------------------------------------Regards,
Rajasekhar

rajasekhar_n wrote:
Hoek, I have cross checked the results both the querys are precessing same records and returing same result *(both are using DB links).*But you said the first query was on a local database?
If you're using dblinks then it's not local is it! ?:|

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... typing
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Field Symbols
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Field symbols provide greater flexibility when you address data objects:
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You can assign one field symbol to another, which allows you to address parts of fields.
Assignments to field symbols may extend beyond field boundaries. This allows you to address regular sequences of fields in memory efficiently.
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Syntax Diagram
FIELD-SYMBOLS
Basic form
FIELD-SYMBOLS <fs>.
Extras:
1. ... TYPE type
2. ... TYPE REF TO cif
3. ... TYPE REF TO DATA
4. ... TYPE LINE OF type
5. ... LIKE s
6. ... LIKE LINE OF s
7. ... TYPE tabkind
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Effect
This statement declares a symbolic field called <fs>. At runtime, you can assign a concrete field to the field symbol using ASSIGN. All operations performed with the field symbol then directly affect the field assigned to it.
You can only use one of the additions.
Example
Output aircraft type from the table SFLIGHT using a field symbol:
FIELD-SYMBOLS <PT> TYPE ANY.
DATA SFLIGHT_WA TYPE SFLIGHT.
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Addition 1
... TYPE type
Addition 2
... TYPE REF TO cif
Addition 3
... TYPE REF TO DATA
Addition 4
... TYPE LINE OF type
Addition 5
... LIKE s
Addition 6
... LIKE LINE OF s
Addition 7
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Effect
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This addition is not allowed in an ABAP Objects context. See Cannot Use Obsolete Casting for FIELD SYMBOLS.
In some cases, the syntax rules that apply to Unicode programs are different than those for non-Unicode programs. See Defining Types Using STRUCTURE.
Effect
Assigns any (internal) field string or structure to the field symbol from the ABAP Dictionary (s). All fields of the structure can be addressed by name: <fs>-fieldname. The structured field symbol points initially to the work area wa specified after DEFAULT.
The work area wa must be at least as long as the structure s. If s contains fields of the type I or F, wa should have the structure s or at least begin in that way, since otherwise alignment problems may occur.
Example
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DATA SBOOK_WA LIKE SBOOK.
FIELD-SYMBOLS <SB> STRUCTURE SBOOK
DEFAULT SBOOK_WA.
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ASSIGN, DATA
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Declaring Field Symbols

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