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< th colspan = "3" align = "center" > Db::set_q_extentsize()< / th >
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The Db Handle
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< h2 class = "title" style = "clear: both" > < a id = "dbset_q_extentsize" > < / a > Db::set_q_extentsize()< / h2 >
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< pre class = "programlisting" > #include < db_cxx.h>
int
Db::set_q_extentsize(u_int32_t extentsize); < / pre >
< p >
Set the size of the extents used to hold pages in a Queue database,
specified as a number of pages. Each extent is created as a separate
physical file. If no extent size is set, the default behavior is to
create only a single underlying database file.
< / p >
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For information on tuning the extent size, see < a href = "../../programmer_reference/rq_conf.html#am_conf_extentsize" class = "olink" > Selecting a extent size< / a > .
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The < code class = "methodname" > Db::set_q_extentsize()< / code > method configures a database, not only
operations performed using the specified < a class = "link" href = "db.html" title = "Chapter > Db< / a >
handle.
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The < code class = "methodname" > Db::set_q_extentsize()< / code > method may not be called after the
< a class = "xref" href = "dbopen.html" title = "Db::open()" > Db::open()< / a > method is called. If
the database already exists when
< a class = "xref" href = "dbopen.html" title = "Db::open()" > Db::open()< / a > is called, the
information specified to < code class = "methodname" > Db::set_q_extentsize()< / code > will be ignored.
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The < code class = "methodname" > Db::set_q_extentsize()< / 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 = "id3579620" > < / a > Parameters< / h3 >
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< h4 class = "title" > < a id = "id3579910" > < / a > extentsize< / h4 >
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The < span class = "bold" > < strong > extentsize< / strong > < / span > parameter is the
number of pages in a Queue database extent.
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< h3 class = "title" > < a id = "id3579403" > < / a > Errors< / h3 >
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The < code class = "methodname" > Db::set_q_extentsize()< / 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 = "id3579983" > < / a > EINVAL< / h4 >
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If the method was called after < a class = "xref" href = "dbopen.html" title = "Db::open()" > Db::open()< / a >
was called; or if an invalid flag value or parameter was specified.
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< h3 class = "title" > < a id = "id3579773" > < / a > See Also< / h3 >
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< a class = "xref" href = "db.html#dblist" title = "Database and Related Methods" > Database and Related Methods< / a >
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