Availability Guide for Application Design

What Is Application Availability?
Availability Guide for Application Design—525637-004
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Availability and HP Products
HP NonStop
operating system
Detects and compensates for problems in the system hardware,
monitors processors, and provides the facilities to execute process
pairs and process monitors. The HP NonStop operating system also
allows batch operations to run concurrently with OLTP without
diminishing OLTP performance.
TNS/R system Provides redundant hardware modules and data paths and the HP
NonStop operating system.
TNS/E system Provides redundant hardware modules and data paths and the HP
NonStop operating system. The way this redundancy is managed
differs from TNS/R.
Table 1-2. Data Protection Products That Help Provide Availability
The product... Helps provide availability because it...
NonStop SQL/MP Allows structural changes to the database to be done online.
NonStop SQL/MX Allows structural changes to the database to be done online.
TMF Provides transaction management with atomicity, consistency,
integrity, and durability for all OLTP operations whether written for
NonStop Tuxedo or the Pathway transaction-processing
environment.
Queue Manager Provides transaction protected queue files as secure storage for
interprocess requests.
Remote Duplicate
Database Facility
(RDF)
Allows you to keep a copy of your database in a remote location in
case of disaster at the primary site.
Table 1-3. Products That Keep Tuxedo Applications Available
The product... Helps provide availability because it...
DAL Server Provides persistent service to DAL applications executing on
Macintosh computers to allow those applications to access data on
HP systems.
Refer to the Data Access Language (DAL) Application Developer’s
Guide for details.
Table 1-1. Server System and Network-Level Products That Help Provide
Availability (page 2 of 2)
The product... Helps provide availability because it...