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diff --git a/db/docs/ref/rep/intro.html b/db/docs/ref/rep/intro.html index e0d670f98..439937cd1 100644 --- a/db/docs/ref/rep/intro.html +++ b/db/docs/ref/rep/intro.html @@ -1,4 +1,4 @@ -<!--Id: intro.so,v 1.2 2001/10/13 20:21:47 bostic Exp --> +<!--Id: intro.so,v 1.3 2001/10/24 19:06:38 bostic Exp --> <!--Copyright 1997-2001 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <html> @@ -16,19 +16,17 @@ <p> <h1 align=center>Introduction</h1> <p>Berkeley DB includes support for building highly available applications based -on single-master (read-only) replication. Berkeley DB replication groups -consist of some number of independently configured database -environments. The database environments might be on separate computers, -on separate boards in a computer with replicated hardware, or on -separate disks in a single computer. The environments may be accessed -by any number of applications, from one to many. As always with Berkeley DB +on replication. Berkeley DB replication groups consist of some number of +independently configured database environments. There is a single +<i>master</i> database environment and one or more <i>client</i> +database environments. Master environments support both database reads +and writes; client environments support only database reads. If the +master environment fails, applications may upgrade a client to be the +new master. The database environments might be on separate computers, +on separate hardware partitions in a non-uniform memory access (NUMA) +system, or on separate disks in a single server. As always with Berkeley DB environments, any number of concurrent processes or threads may access -the database environment. -<p>Berkeley DB replication groups contain a single <i>master</i> database -environment and one or more <i>client</i> database environments. -Master environments support both database reads and writes; client -environments support only database reads. If the master environment -fails, applications may upgrade a client to be the new master. +a database environment. <p>Applications may be written to provide various degrees of consistency between the master and clients. The system can be run synchronously such that replicas are guaranteed to be up-to-date with all committed |