Roger Barga and David Lomet
High availability for both data and applications is rapidly
becoming a business requirement. While database systems
support recovery, providing high database availability,
applications may still lose work because of server outages.
When a server crashes, volatile state associated with the
application's database session is lost and the application may
require operator-assisted restart. This exposes server failures to
end-users and always degrades application availability. Our
Phoenix/ODBC system supports persistent database sessions
that can survive a database crash without the application being
aware of the outage, except for possible timing considerations.
This improves application availability and eliminates
application programming needed to cope with database crashes.
Phoenix/ODBC requires no changes to database system, data
access routines, or applications. Hence, it can be deployed in
any application that uses ODBC to access a database. Further,
our generic approach can be exploited for a variety of data
access protocols. In this paper, we describe the design of
Phoenix/ODBC and introduce an extension to optimize response
time and reduce overhead for OLTP workloads. We present a
performance evaluation using TPC-C and TPC-H benchmarks
that demonstrate Phoenix/ODBC’s extra overhead is modest.
|Published in||ICDE Conference|
|Publisher||IEEE Computer Society|
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