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<title>Berkeley DB: DbMpoolFile::set_pgcookie</title>
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<h1>DbMpoolFile::set_pgcookie</h1>
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#include <db_cxx.h>
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DbMpoolFile::set(DBT *pgcookie);
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<p>The DbMpoolFile::set_pgcookie method specifies a byte string that is provided
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to the functions registered to do input or output processing of the
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file's pages as they are read from or written to, the backing filesystem
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store. (See the <a href="../api_cxx/memp_register.html">DbEnv::memp_register</a> documentation for more
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<p>The DbMpoolFile::set_pgcookie method configures a file in the memory pool, not only
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operations performed using the specified <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a> handle.
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<p>The DbMpoolFile::set_pgcookie interface may not be called after the <a href="../api_cxx/memp_fopen.html">DbMpoolFile::open</a>
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If the file is already open in the memory pool when
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<a href="../api_cxx/memp_fopen.html">DbMpoolFile::open</a> is called, the information specified to DbMpoolFile::set_pgcookie
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will replace the existing information.
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<p>The DbMpoolFile::set_pgcookie method either returns a non-zero error value or throws an exception that
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encapsulates a non-zero error value on failure, and returns 0 on success.
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<p>The DbMpoolFile::set_pgcookie method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
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If a catastrophic error has occurred, the DbMpoolFile::set_pgcookie method may fail and
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either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw a
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<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
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in which case all subsequent Berkeley DB calls will fail in the same way.
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<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a>
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<a href="../api_cxx/memp_list.html">Memory Pools and Related Methods</a>
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