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< th colspan = "3" align = "center" > DbEnv::rep_set_nsites()< / th >
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Replication Methods
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< h2 class = "title" style = "clear: both" > < a id = "repnsites" > < / a > DbEnv::rep_set_nsites()< / h2 >
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< pre class = "programlisting" > #include < db_cxx.h>
int
DbEnv::rep_set_nsites(u_int32_t nsites); < / pre >
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The < code class = "methodname" > DbEnv::rep_set_nsites()< / code > method specifies the total number of
sites in a replication group. This method should not be used by
Replication Manager applications; the number of sites in use by a
Replication Manager application is determined dynamically.
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The < code class = "methodname" > DbEnv::rep_set_nsites()< / code > method is typically called by
Base API applications. (However, see also the
< a class = "xref" href = "repelect.html" title = "DbEnv::rep_elect()" > DbEnv::rep_elect()< / a > method
< span class = "bold" > < strong > nsites< / strong > < / span >
parameter.)
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The database environment's replication subsystem may also be
configured using the environment's < a href = "../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class = "olink" > DB_CONFIG< / a > file. The syntax of
the entry in that file is a single line with the string
"rep_set_nsites", one or more whitespace characters, and the
number of sites specified. For example, "rep_set_nsites 5" sets
the number of sites to 5. Because the < a href = "../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class = "olink" > DB_CONFIG< / a > file is read
when the database environment is opened, it will silently overrule
configuration done before that time.
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The < code class = "methodname" > DbEnv::rep_set_nsites()< / code > method configures a database
environment, not only operations performed using the specified
< a class = "link" href = "env.html" title = "Chapter > DbEnv< / a > handle.
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If master leases are in use, the < code class = "methodname" > DbEnv::rep_set_nsites()< / code > method
should not be called after the < a class = "xref" href = "repstart.html" title = "DbEnv::rep_start()" > DbEnv::rep_start()< / a >
method is called as this could cause you to lose data previously
thought to be durable. If master leases are not in use, the
< code class = "methodname" > DbEnv::rep_set_nsites()< / code > method may be
called at any time during the life of the application.
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The < code class = "methodname" > DbEnv::rep_set_nsites()< / code > < span >
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method either returns a non-zero error value or throws an
exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
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< h3 class = "title" > < a id = "id3640680" > < / a > Parameters< / h3 >
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< h4 class = "title" > < a id = "id3640669" > < / a > nsites< / h4 >
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An integer specifying the total number of sites in the replication
group.
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< h3 class = "title" > < a id = "id3640695" > < / a > Errors< / h3 >
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The < code class = "methodname" > DbEnv::rep_set_nsites()< / code > < span >
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method may fail and throw a < a class = "link" href = "dbexception.html" title = "Chapter > DbException< / a >
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors:
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< h4 class = "title" > < a id = "id3640846" > < / a > EINVAL< / h4 >
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If master leases are in use and replication has already been started; or if
an invalid flag value or parameter was specified.
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< h3 class = "title" > < a id = "id3640163" > < / a > See Also< / h3 >
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< a class = "xref" href = "rep.html#replist" title = "Replication and Related Methods" > Replication and Related Methods< / a >
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