--分析sql

select * from crb_test where rid(crb_test)=1376518147

[db2inst1@localhost C0000000.TMP]$ dynexpln -d suzhou -q "select

* from crb_test where rid(crb_test)=1376518147" -g -i -t

DB2 Universal Database Version 9.7, 5622-044 (c) Copyright IBM

Corp. 1997, 2008

Licensed Material - Program Property of IBM

IBM DATABASE 2 Dynamic SQL Explain Tool

NOTE: db2expln can now process dynamic statements directly and

should

be used instead of dynexpln.

CONNECT TO suzhou

Database Connection

Information

Database

server = DB2/LINUX 9.7.1

SQL authorization

ID = DB2INST1

Local database

alias = SUZHOU

PREP DYNEXPLN.sqc PACKAGE USING DYNEXPLN

LINE MESSAGES FOR DYNEXPLN.sqc

------ --------------------------------------------------------------------

SQL0060W The "C" precompiler is in

progress.

SQL0091W Precompilation or binding was ended with

"0"

errors and "0" warnings.

TERMINATE

DB20000I The TERMINATE command completed

successfully.

DB2 Universal Database Version 9.7, 5622-044 (c) Copyright IBM

Corp. 1991, 2008

Licensed Material - Program Property of IBM

IBM DB2 Universal Database SQL and XQUERY Explain Tool

DB2 Universal Database Version 9.7, 5622-044 (c) Copyright IBM

Corp. 1991, 2008

Licensed Material - Program Property of IBM

IBM DB2 Universal Database SQL and XQUERY Explain Tool

******************** PACKAGE

***************************************

Package Name = "DB2INST1"."DYNEXPLN" Version =

""

Prep Date = 2010/11/10

Prep Time = 15:13:08

Bind Timestamp = 2010-11-10-15.13.08.276868

Isolation

Level = Cursor Stability

Blocking = Block Unambiguous Cursors

Query Optimization Class = 5

Partition

Parallel = No

Intra-Partition Parallel = No

SQL

Path = "SYSIBM", "SYSFUN", "SYSPROC", "SYSIBMADM",

"DB2INST1"

-------------------- SECTION

---------------------------------------

Section = 1

Statement:

DECLARE C1 CURSOR

FOR

select *

from crb_test

where rid(crb_test)=1376518147

Section Code Page = 1208

Estimated Cost =

0.000233 --这么低的cost 真少见Estimated

Cardinality = 1.000000

( 2)

Access Table Name = DB2INST1.CRB_TEST ID =

4,5654

| #Columns = 4

| Single Record

| Skip Inserted Rows

| Fetch Direct Using Row IDs

| Lock Intents

| | Table: Intent Share

| | Row :

Next Key Share

( 1) Return

Data to Application

| #Columns = 4

End of section

Optimizer Plan:

Rows Operator

(ID) Cost 1 n/a RETURN (

1) 0.000232826

| 1 n/a FETCH (

2) 0.000232826

| 1.2e+06 n/a Table: DB2INST1

CRB_TEST