<!--$Id: env_dbremove.so,v 10.49 2004/12/16 19:13:01 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DB_ENV->dbremove</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <b>DB_ENV->dbremove</b> </td> <td align=right> <a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a> <a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <b><pre> #include <db.h> <p> int DB_ENV->dbremove(DB_ENV *dbenv, DB_TXN *txnid, const char *file, const char *database, u_int32_t flags); </pre></b> <hr size=1 noshade> <b>Description: DB_ENV->dbremove</b> <p>The DB_ENV->dbremove method removes the database specified by the <b>file</b> and <b>database</b> parameters. If no <b>database</b> is specified, the underlying file represented by <b>file</b> is removed, incidentally removing all of the databases it contained.</p> <p>Applications should never remove databases with open <a href="../api_c/db_class.html">DB</a> handles, or in the case of removing a file, when any database in the file has an open handle. For example, some architectures do not permit the removal of files with open system handles. On these architectures, attempts to remove databases currently in use by any thread of control in the system may fail.</p> <p>The DB_ENV->dbremove method returns a non-zero error value on failure and 0 on success. </p> <b>Parameters</b> <br> <b>database</b><ul compact><li>The <b>database</b> parameter is the database to be removed.</ul> <b>file</b><ul compact><li>The <b>file</b> parameter is the physical file which contains the database(s) to be removed.</ul> <p>When using a Unicode build on Windows (the default), the <b>file</b> argument will be interpreted as a UTF-8 string, which is equivalent to ASCII for Latin characters.</p> <b>flags</b><ul compact><li>The <b>flags</b> parameter must be set to 0 or the following value: <br> <b><a name="DB_AUTO_COMMIT">DB_AUTO_COMMIT</a></b><ul compact><li>Enclose the DB_ENV->dbremove call within a transaction. If the call succeeds, changes made by the operation will be recoverable. If the call fails, the operation will have made no changes.</ul> <br></ul> <b>txnid</b><ul compact><li>If the operation is part of an application-specified transaction, the <b>txnid</b> parameter is a transaction handle returned from <a href="../api_c/txn_begin.html">DB_ENV->txn_begin</a>; if the operation is part of a Berkeley DB Concurrent Data Store group, the <b>txnid</b> parameter is a handle returned from <a href="../api_c/env_cdsgroup_begin.html">DB_ENV->cdsgroup_begin</a>; otherwise NULL. If no transaction handle is specified, but the DB_AUTO_COMMIT flag is specified, the operation will be implicitly transaction protected. </ul> <br> <br><b>Environment Variables</b> <p>The environment variable <b>DB_HOME</b> may be used as the path of the database environment home.</p> <p>DB_ENV->dbremove is affected by any database directory specified using the <a href="../api_c/env_set_data_dir.html">DB_ENV->set_data_dir</a> method, or by setting the "set_data_dir" string in the environment's <a href="../ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file.</p> <br><b>Errors</b> <p>The DB_ENV->dbremove method may fail and return one of the following non-zero errors:</p> <br> <b>DB_LOCK_DEADLOCK</b><ul compact><li>A transactional database environment operation was selected to resolve a deadlock.</ul> <b>DB_LOCK_NOTGRANTED</b><ul compact><li>A Berkeley DB Concurrent Data Store database environment configured for lock timeouts was unable to grant a lock in the allowed time.</ul> <br> <br> <b>EINVAL</b><ul compact><li>If DB_ENV->dbremove called before <a href="../api_c/env_open.html">DB_ENV->open</a> was called; or if an invalid flag value or parameter was specified.</ul> <br> <br> <b>ENOENT</b><ul compact><li>The file or directory does not exist.</ul> <br> <hr size=1 noshade> <br><b>Class</b> <a href="../api_c/env_class.html">DB_ENV</a> <br><b>See Also</b> <a href="../api_c/env_list.html">Database Environments and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>