db2udb the basics
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DB2 UDB the Basics
Keith E. [email protected]
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Introduction
DB2 UDB V8.2
Basic Database Administration
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Products
DB2 Personal Edition
DB2 Workgroup Server Edition
DB2 Enterprise Server Edition
DB2 Workgroup Server Unlimited Edition
DB2 UDB Express Edition
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Data Partitioning Feature
Data Data Data Data
Ethernet
Node 1 Node 2 Node 3 Node 4
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Instance Manages one or more databases
Must have root or Administrator Authority to create
db2icrt is used to create an instance
db2idrop is used to drop an instance
db2iupdt is used to update the instance
db2icrt -u fencedusr instance_name
db2start will start an instance
db2stop will stop an instance
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Creating the Database
Create db database-name
Creates three table spaces
Creates System Catalog Tables
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Create Database Command
CREATE DATABASE dbname AS alias_name
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Table Space
Logical layer between Hardware and Database
Comprised of one or more containers
A container is a file or a directory
REGULAR
CREATE TABLESPACE name
LARGE
SYSTEM
TEMPORARY
USER
MANAGED BY SYSTEM system-containers
DATABASE database-containers
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System ContainersSMS Containers
USING (container string)
DMS Containers
USING (FILE container string number of pages)
(DEVICE container string number of pages)
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Table Space Example
CREATE TABLESPACE TS1 MANAGED BY SYSTEM
USING (/home/inst01/database/ts1)
CREATE TABLESPACE DMS01D MANAGED BY DATABASE
USING (FILE C:\DMS\DATABASE\DMS01D 1000)
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Create Tables
Command Line
db2 create table ARTISTS (
ARTNO SMALLINT NOT NULL,NAME VARCHAR(40),
COMPANY CHAR(20), BIO CLOB (10K) NOT LOGGED,
PICTURE BLOB (2700K) NOT LOGGED )
IN DMS01D INDEX IN DMS01I LONG IN DMS01L
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Create Table Script File
create table warehouse
(itemno smallint,
warehousename char(20),
qty integer )
in dms03d;
The script file cr_warehouse contains the above info
db2tvf cr_warehouse
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Table Characteristics
Describe command
db2 describe table ARTISTS
Column Type Type
name schema name Length Scale Nulls
--------------- --------- ------------------ -------- ----- ------
ARTNO SYSIBM SMALLINT 2 0 No
NAME SYSIBM VARCHAR 40 0 Yes
COMPANY SYSIBM CHARACTER 20 0 Yes
BIO SYSIBM CLOB 20480 0 Yes
PICTURE SYSIBM BLOB 2764800 0 Yes
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Describe Indexes
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Moving Data
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Moving Data
IMPORT
EXPORT
LOAD db2move
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Import / Export
FileImport
Export
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IMPORT utility
IMPORT FROM filename OF IXFDEL
ASC
LOBS FROM lob-path MODIFIED BY options
MESSAGES
INSERT INTO table-nameINSERT_UPDATE
REPLACE
REPLACE_CREATE
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Export
EXPORT TO file OF IXF MESSAGES message-file
DEL
WSF
select statement
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LOAD
1) Load Loads data, collects index keys
2) Build creates the indexes
3) Delete Delete unique key violations place into
exception tables.4) Index Copy copy indexes from temp table space
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LOAD Command
LOAD FROM filename OF IXF
ASC
DEL
LOBS FROM lob-path MODIFIED BY optionsMESSAGES message-file
INSERT INTO table-name
REPLACE
RESTART
TERMINATE
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LOAD from Cursor
Create nickname sales for
another database SAMPLE table SALES
Create nickname employee for
another database SAMPLE table EMPLOYEE
DECLARE C1 CURSOR FOR SELECT SALES.SALES_PERSON,
LASTNAME, FIRSTNME FROM SALES, EMPLOYEE
WHERE SALES_PERSON = EMPLOYEE.LASTNAME
LOAD FROM C1 OF CURSOR INSERT INTO LOCAL_SALES
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db2move
db2move
Database
db2move.lst
table.ixf
DB2MOVE
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db2move syntax
db2move database-name import
export
load
tc table-creatorstn table-name
sn schema-names
ts table space-names
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GUI Tools Using Graphical User Interface
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Using the Control Center
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Control Center Create Database
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Examples of Table Space
CREATE TABLESPACE TS1 MANAGED BY SYSTEM
USING (C:\SMS\MUSICKEG\TS1)
CREATE TABLESPACE DMS01D MANAGED BY DATABASE
USING (FILE C:\DMS\MUSICKEG\DMS01D 161)
EXTENTSIZE 8 PREFETECHSIZE 8
CREATE TABLESPACE DMS01I MANAGED BY DATABASE
USING (FILE C:\DMS\MUSICKEG\DMS01I 48)
EXTENTSIZE 4 PREFETCHSIZE 4
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Table Space Using GUI
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Table Space Using GUI (2)
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Table Space Using GUI (3)
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Table Space Using GUI (4)
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Command Editor
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Visual Explain
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Visual Explain
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Task Center
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Journal
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RECOVERY
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Recovery
Defining logs
Recovery of database
Recovery of a table space
Offline versus Online
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Database Recovery LOGRETAIN = NO
Database
S0000000.log
S0000001.log
S00000002.log
S0000003.log (Secondary Log)
S0000004.log (Secondary Log)
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Database Recovery LOGRETAIN = RECOVERY
Database
S0000000.log
S0000001.log
S00000002.log
S0000003.log
S0000004.log
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Backup
If LOGRETAIN = Recovery you may backup table space ordatabase
If LOGRETAIN = NO you may only backup database
BACKUP DB database-name ONLINE to C:\backup
INCLUDE LOGS
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Recovery
If LOGRETAIN = NO, you may only recover the database
If LOGRETAIN = RECOVERY, you may recover a table spaceor a database from a full database backup
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Modes of Recovery
Offline
Online
RESTORE DB database-name FROM file TAKEN AT time
ROLLFORWARD DATABASE database-name
TO isotime AND STOP
END OF LOGS
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HADR High Availability Disaster Recovery
Database_standby
Database1
Laptop computer
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Performance and Tuning
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Performance and Tuning
Database Configuration parameters
Database Structure
SQL Statements
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Database Configuration parameters
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Configuration Parameters
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Buffer Pool
Database
Buff er Pool
Select * f rom Staff
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Monitoring Buffer Pool Hit Ratio
db2 get snapshot for bufferpools on database-name
Bufferpool name = IBMDEFAULTBP
Database name = MUSICKEG
Database path = C:\DB2\NODE0000\SQL00002\
Input database alias = MUSICKEG
Snapshot timestamp = 05/04/2005 13:11:37.329018
Buffer pool data logical reads = 336
Buffer pool data physical reads = 129
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Sort Heap
Sorts are done in sortheap
If no space for sort data is moved to TEMPSPACEn
GET SNAPSHOT FOR ALL ON database
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Package Cache
Dynamic SQL statements
Package Cache
Select * from Staff where ID = 10Select * from Staff where ID = 10
Update Staff Set Salary = Salary + 100 wher e ID = 10
Select * from EMPLOYEE
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LOCK
Locks are held to prevent loss of data
Lock Row / Table / Table Space
LOCKLIST
MAXLOCKS
ALTER TABLE table-name LOCKSIZE TABLE
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Show Locks
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SQL Statements
Determine which statement is causing the majority ofproblems
Determine what might be causing the problem
Testing the solution
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SQL Activity Monitor
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Visual Explain
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Table Statistics
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Performance Summary
Buffer pools
Numerous Database Configuration parameters
SQL Statement Tuning
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Security
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Security
Security is used at the operating system level
Table access is through the database
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Instance Level
SYSADM_GROUP
SYSCTRL_GROUP
SYSMAINT_GROUP
SYSMON_GROUP
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GRANT / REVOKE
GRANT access to an object/program
REVOKE access to an object/program
GRANT SELECT ON TABLE ARTISTS TO USER1
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Summary
The Relational Database can be simple or complex
The database structure is simple, Table spaces, Tables, etc.
Recovery is straight forward
Database maintenance can be automated
Tuning the database is a life long endeavor
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DB2 UDB Proof of Technology
July 12, 13 DB2 UDB Administration Proof of Technology
IBM McClean Tec
8401 Greensboro Drive
McClean, VA 22102
Suite 120 First Floor
WebSphere Information Integrator July 14, 2005
Contact: Keith E. Gardenhire
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DB2 UDB Proof of Technology Cont