Quick Beginnings for DB2 Extended Enterprise Edition for UNIX
Version 5 of DB2 Universal Database Extended Enterprise Edition is the
follow-on product to DB2 Parallel Edition Version 1.2 (which was
available on AIX only); it includes all the features and enhancements of DB2
Version 2 and Database Server Version 4, and offers many new features.
This section describes some of the major changes for this version, and points
you to sources of more information in the DB2 library. The numerous
- Exploitation of symmetric multiprocessors (SMP) for improved scalability
- DB2 now exploits the ability of an SMP system to share resources across
multiple processors, performing your SQL queries more quickly. Commands
like load, backup, and restore also take
advantage of the multiprocessor environments.
For more information on SMP parallelism, refer to the Administration Guide. Commands are described in more detail in the Command Reference.
- New graphical tools on OS/2, Windows 95, and Windows NT that make it easy
to install, configure, and administer DB2 databases
- From the Control Center, you can accomplish just about any administrative
task. You can also use the graphical tools to administer any DB2 server
on any of the available platforms. For more details, refer to the
online help available with the Control Center.
From the Client Configuration Assistant, you can configure communications
for clients to access remote or local DB2 servers. For more details,
refer to the online help available with the Client Configuration
Comprehensive online help and the Information Center help you easily find
the information you need to use DB2.
- Extensions to SQL, including support for Online Analytical Processing
- With the new CUBE and ROLLUP aggregations, you can now create super
groups, like overall total and cross tabulation,
for improved online analytical processing. You can also perform outer
joins, rename tables, define unique constraints on tables, and create your own
table functions. DB2 has refined its authorization support, so you can
grant authority at a more granular level; you can also create schemas to grant
various attributes and privileges. For more details on these and other
new SQL features, refer to the SQL Reference.
- Performance, capacity, and memory improvements
- DB2 now provides global caching for SQL statements, creating a public
repository that improves performance. You can create multiple buffer
pools of various sizes to better control the data in memory.
Client/server communications are more efficient, crash and roll-forward
recovery is faster, and load features numerous performance
enhancements. For information on how to exploit these enhancements,
refer to the Administration Guide.
- Security enhancements, including support for Open Software
Foundation's Distributed Computing Environment (DCE)
- You can now use the DCE architecture to manage users, passwords, and
groups more easily, and authenticate users more securely. DB2 also
provides a "Trusted Clients" option so you can choose whether to trust all
clients or only those that come from an operating system with inherent
security. Security considerations are described more fully in the Administration Guide.
- Additional support for communicating with host databases using DB2 Connect
and the Distributed Relational Database Architecture (DRDA)
- In addition to communicating with host systems using SNA, you can now use
TCP/IP to communicate with host systems that support this protocol.
(Currently, only DB2 for OS/390 Version 5.1 supports TCP/IP.) In
addition, DB2 servers can accept requests from host systems using
TCP/IP, allowing you to use your DB2 workstation server as an
application server to a host application. On OS/2 and UNIX platforms,
you can perform two-phase commits using DB2 Connect and TCP/IP; if
you're using SNA, you can invoke a two-phase commit involving both the
host and the DB2 server. For more details about connecting to host
databases, refer to the DB2 Connect Enterprise Edition
Quick Beginnings and the DB2 Connect User's Guide.
- Enhancements to application programming for DB2
- The DB2 Call Level Interface (DB2 CLI) now reflects the Microsoft Open
Database Connectivity 3.0 specifications, allowing you to connect to
DB2 databases from ODBC 3.0 applications. Additions to user
defined functions (UDFs) include scrollable cursors and the UCT_UNIQUE
function to return a unique value to use in a table column. You can
also invoke external UDFs that are methods of object linking and embedding
(OLE) automation servers. For more details on these and other
improvements, refer to the CLI Guide and Reference, Embedded SQL Programming Guide, and the API Reference.
There are many other new features, for example:
- The DB2 Governor which you can use to control application behavior.
- New table space features, such as point-in-time roll-forward recovery and
- Improved error messages.
For a comprehensive list of what's new, refer to the Information
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