Getting Startedwith pureQuery

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342 <strong>Getting</strong> Started with <strong>pureQuery</strong> Table C.1 - Useful instance-level DB2 commands Within an instance you can create many databases. A database is a collection of objects such as tables, views, indexes, and so on. For example, in Figure C.9, the database MYDB1 has been created within instance myinst. Table C.2 shows some commands you can use at the database level. Command/SQL statement create database drop database connect to create table/create view/create index Description Creates a new database Drops a database Connects to a database SQL statements to create table, views, and indexes respectively Table C.2 - Commands and SQL Statements at the database level C.6 DB2 configuration DB2 parameters can be configured using the Configuration Advisor GUI tool. The Configuration Advisor can be accessed through the Control Center by right clicking on a database and choosing Configuration Advisor. Based on your answers to some questions about your system resources and workload, the configuration advisor will provide a list of DB2 parameters that would operate optimally using the suggested values. If you would like more detail about DB2 configuration, keep reading. Otherwise, use the Configuration Advisor and you are ready to work with DB2! A DB2 server can be configured at four different levels as shown earlier in Figure C.9: • Environment variables are variables set at the operating system level. The main environment variable to be concerned about is DB2INSTANCE. This variable indicates the current instance you are working on, and for which your DB2 commands will apply. • Database Manager Configuration File (dbm cfg) includes parameters that affect the instance and all the databases it contains. Table C.3 shows some useful commands to manage the dbm cfg. Command Description
Appendix C – Up and Running with DB2 Express-C 343 get dbm cfg update dbm cfg using Retrieves information about the dbm cfg Updates the value of a dbm cfg parameter Table C.3 - Commands to manipulate the dbm cfg • Database Configuration File (db cfg) includes parameters that affect the particular database in question. Table C.4 shows some useful commands to manage the db cfg. Command get db cfg for update db cfg for using Description Retrieves information about the db cfg for a given database Updates the value of a db cfg parameter Table C.4 - Commands to manipulate the db cfg • DB2 Profile Registry variables includes parameters that may be platform specific and can be set globally (affecting all instances), or at the instance level (affecting one particular instance). Table C.5 shows some useful commands to manipulate the DB2 profile registry. Command db2set -all db2set = Description Lists all the DB2 profile registry variables that are set Sets a given parameter with a value Table C.5 - Commands to manipulate the DB2 profile registry C.7 Connecting to a database If your database is local, that is, it resides on the same system where you are performing your database operation; the connection setup is performed automatically when the database is created. You can simply issue a connect to database_name statement to connect to the database. If your database is remote, the simplest method to set up database connectivity is by using the Configuration Assistant GUI tool following these steps:
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G E T T I N G S T A R T E D W I T H
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Notices This information was develo
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Trademarks IBM, the IBM logo, DB2,
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1 Chapter 1 - Introduction to pureQ
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2 Chapter 2 - Installing pureQuery
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PART II - TOOLING
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PART III - SECURITY, PERFORMANCE, A
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6 Chapter 6 - The Client Optimizer:
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