<!--Copyright 1999,2008 Oracle. All rights reserved.--> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="GENERATOR" content="Mozilla/4.75 [en] (X11; U; Linux 2.2.16-22 i686) [Netscape]"> </head> <body> <h2> Environment Commands</h2> Environments provide a structure for creating a consistent environment for processes using one or more of the features of Berkeley DB. Unlike some of the database commands, the environment commands are very low level. <br> <hr WIDTH="100%"> <p>The user may create and open a new DB environment by invoking: <p><b>> berkdb env</b> <br><b> [-cdb] [-cdb_alldb] [-lock] [-log] [-txn [nosync]]</b> <br><b> [-create] [-home<i> directory</i>] [-mode <i>mode</i>]</b> <br><b> [-data_dir <i>directory</i>] [-log_dir <i>directory</i>] [-tmp_dir <i>directory</i>]</b> <br><b> [-nommap] [-private] [-recover] [-recover_fatal] [-system_mem] [-errfile <i>filename</i>]</b> <br><b> [-use_environ] [-use_environ_root] [-verbose {<i>which </i>on|off}]</b> <br><b> [-region_init]</b> <br><b> [-cachesize {<i>gbytes bytes ncaches</i>}]</b> <br><b> [-mmapsize<i> size</i>]</b> <br><b> [-log_max <i>max</i>]</b> <br><b> [-log_buffer <i>size</i>]</b> <br><b> [-lock_conflict {<i>nmodes </i>{<i>matrix</i>}}]</b> <br><b> [-lock_detect default|oldest|random|youngest]</b> <br><b> [-lock_max <i>max</i>]</b> <br><b> [-lock_max_locks <i>max</i>]</b> <br><b> [-lock_max_lockers <i>max</i>]</b> <br><b> [-lock_max_objects <i>max</i>]</b> <br><b> [-lock_timeout <i>timeout</i>]</b> <br><b> [-overwrite]</b> <br><b> [-txn_max <i>max</i>]</b> <br><b> [-txn_timeout <i>timeout</i>]</b> <br><b> [-client_timeout <i>seconds</i>]</b> <br><b> [-server_timeout <i>seconds</i>]</b> <br><b> [-server <i>hostname</i>]</b> <br><b> [-rep_master] [-rep_client]</b> <br><b> [-rep_transport <i>{ machineid sendproc }</i>]</b> <br> <p>This command opens up an environment. We automatically set the DB_THREAD and the DB_INIT_MPOOL flags. The arguments are: <ul> <li> <b>-cdb</b> selects the DB_INIT_CDB flag for Concurrent Data Store</li> <li> <b>-cdb_alldb</b> selects the DB_CDB_ALLDB flag for Concurrent Data Store</li> <li> <b>-lock</b> selects the DB_INIT_LOCK flag for the locking subsystem</li> <li> <b>-log</b> selects the DB_INIT_LOG flag for the logging subsystem</li> <li> <b>-txn</b> selects the DB_INIT_TXN, DB_INIT_LOCK and DB_INIT_LOG flags for the transaction subsystem. If <b>nosync</b> is specified, then it will also select DB_TXN_NOSYNC to indicate no flushes of log on commits</li> <li> <b>-create </b>selects the DB_CREATE flag to create underlying files</li> <li> <b>-home <i>directory </i></b>selects the home directory of the environment</li> <li> <b>-data_dir <i>directory </i></b>selects the data file directory of the environment by calling <a href="../../docs/api_c/env_set_data_dir.html">DBENV->set_data_dir</a>.</li> <li> <b>-log_dir <i>directory </i></b>selects the log file directory of the environment by calling <a href="../../docs/api_c/env_set_lg_dir.html">DBENV->set_lg_dir</a>.</li> <li> <b>-tmp_dir <i>directory </i></b>selects the temporary file directory of the environment by calling <a href="../../docs/api_c/env_set_tmp_dir.so">DBENV->set_tmp_dir</a>.</li> <li> <b>-mode <i>mode </i></b>sets the permissions of created files to <b><i>mode</i></b></li> <li> <b>-nommap</b> selects the DB_NOMMAP flag to disallow using mmap'ed files</li> <li> <b>-private</b> selects the DB_PRIVATE flag for a private environment</li> <li> <b>-recover</b> selects the DB_RECOVER flag for recovery</li> <li> <b>-recover_fatal</b> selects the DB_RECOVER_FATAL flag for catastrophic recovery</li> <li> <b>-system_mem</b> selects the DB_SYSTEM_MEM flag to use system memory</li> <li> <b>-errfile </b>specifies the error file to use for this environment to <b><i>filename</i></b> by calling <a href="../../docs/api_c/env_set_errfile.html">DBENV->set_errfile</a><b><i>. </i></b>If the file already exists then we will append to the end of the file</li> <li> <b>-use_environ</b> selects the DB_USE_ENVIRON flag to affect file naming</li> <li> <b>-use_environ_root</b> selects the DB_USE_ENVIRON_ROOT flag to have the root environment affect file naming</li> <li> <b>-verbose</b> produces verbose error output for the given which subsystem, using the <a href="../../docs/api_c/dbenv_set_verbose.html">DBENV->set_verbose</a> method. See the description of <a href="#> <env> verbose which on|off">verbose</a> below for valid <b><i>which </i></b>values</li> <li> <b>-region_init </b>specifies that the user wants to page fault the region in on startup using the <a href="../../docs/api_c/env_set_region_init.html">DBENV->set_region_init</a> method call</li> <li> <b>-cachesize </b>sets the size of the database cache to the size specified by <b><i>gbytes </i></b>and <b><i>bytes, </i></b>broken up into <b><i>ncaches</i></b> number of caches using the <a href="../../docs/api_c/env_set_cachesize.html">DBENV->set_cachesize</a> method</li> <li> <b>-mmapsize </b>sets the size of the database page to <b><i>size </i></b>using the <a href="../../docs/api_c/env_set_mp_mmapsize.html">DBENV->set_mp_mmapsize</a> method</li> <li> <b>-log_max </b>sets the maximum size of the log file to <b><i>max</i></b> using the <a href="../../docs/api_c/env_set_lg_max.html">DBENV->set_lg_max</a> call</li> <li> <b>-log_regionmax </b>sets the size of the log region to <b><i>max</i></b> using the <a href="../../docs/api_c/env_set_lg_regionmax.html">DBENV->set_lg_regionmax</a> call</li> <li> <b>-log_buffer </b>sets the size of the log file in bytes to <b><i>size</i></b> using the <a href="../../docs/api_c/env_set_lg_bsize.html">DBENV->set_lg_bsize</a> call</li> <li> <b>-lock_conflict </b>sets the number of lock modes to <b><i>nmodes</i></b> and sets the locking policy for those modes to the <b><i>conflict_matrix</i></b> given using the <a href="../../docs/api_c/env_set_lk_conflict.html">DBENV->set_lk_conflict</a> method call</li> <li> <b>-lock_detect </b>sets the deadlock detection policy to the given policy using the <a href="../../docs/env_set_lk_detect.html">DBENV->set_lk_detect</a> method call. The policy choices are:</li> <ul> <li> <b>default</b> selects the DB_LOCK_DEFAULT policy for default detection</li> <li> <b>oldest </b>selects DB_LOCK_OLDEST to abort the oldest locker on a deadlock</li> <li> <b>random</b> selects DB_LOCK_RANDOM to abort a random locker on a deadlock</li> <li> <b>youngest</b> selects DB_LOCK_YOUNGEST to abort the youngest locker on a deadlock</li> </ul> <li> <b>-lock_max_locks </b>sets the maximum number of locks to <b><i>max </i></b>using the <a href="../../docs/api_c/env_set_lk_max_locks.html">DBENV->set_lk_max_locks</a> method call</li> <li> <b>-lock_max_lockers </b>sets the maximum number of locking entities to <b><i>max </i></b>using the <a href="../../docs/api_c/env_set_lk_max_lockers.html">DBENV->set_lk_max_lockers</a> method call</li> <li> <b>-lock_max_objects </b>sets the maximum number of simultaneously locked objects to <b><i>max </i></b>using the <a href="../../docs/api_c/env_set_lk_max_objects.html">DBENV->set_lk_max_objects</a> method call</li> <li> <b>-lock_timeout </b>sets the timeout for locks in the environment</li> <li> <b>-overwrite </b>sets DB_OVERWRITE flag</li> <li> <b>-txn_max </b>sets the maximum size of the transaction table to <b><i>max</i></b> using the <a href="../../docs/api_c/env_set_txn_max.html">DBENV->set_txn_max</a> method call</li> <li> <b>-txn_timeout </b>sets the timeout for transactions in the environment</li> <li> <b>-client_timeout</b> sets the timeout value for the client waiting for a reply from the server for RPC operations to <b><i>seconds</i></b>.</li> <li> <b>-server_timeout</b> sets the timeout value for the server to determine an idle client is gone to <b><i>seconds</i></b>.</li> <li> <b>-server </b>specifies the <b><i>hostname</i></b> of the server to connect to in the <a href="../../docs/api_c/env_set_server.html">DBENV->set_server</a> call.</li> <li> <b>-rep_client </b>sets the newly created environment to be a replication client, using the <a href="../../docs/api_c/rep_client.html"> DBENV->rep_client</a> call.</li> <li> <b>-rep_master </b>sets the newly created environment to be a replication master, using the <a href="../../docs/api_c/rep_master.html"> DBENV->rep_master</a> call.</li> <li> <b>-rep_transport </b>specifies the replication transport function, using the <a href="../../docs/api_c/rep_transport.html">DBENV->rep_set_transport</a> call. This site's machine ID is set to <b><i>machineid</i></b> and the send function, a Tcl proc, is set to <b><i>sendproc</i></b>.</li> </ul> This command will invoke the <a href="../../docs/api_c/env_create.html">db_env_create</a> function. After it successfully gets a handle to an environment, we bind it to a new Tcl command of the form <b><i>envX</i></b>, where X is an integer starting at 0 (e.g. <b>env0, env1, </b>etc). We use the <i>Tcl_CreateObjCommand()</i> to create the top level environment command function. It is through this handle that the user can access all the commands described in the <a href="#Environment Commands">Environment Commands</a> section. Internally, the handle we get back from DB will be stored as the <i>ClientData</i> portion of the new command set so that all future environment calls will have that handle readily available. Then we call the <a href="../../docs/api_c/env_open.html">DBENV->open</a> method call and possibly some number of setup calls as described above. <p> <hr WIDTH="100%"> <br><a NAME="> <env> verbose which on|off"></a><b>> <env> verbose <i>which</i> on|off</b> <p>This command controls the use of debugging output for the environment. This command directly translates to a call to the <a href="../../docs/api_c/dbenv_set_verbose.html">DBENV->set_verbose</a> method call. It returns either a 0 (for success), a DB error message or it throws a Tcl error with a system message. The user specifies <b><i>which</i></b> subsystem to control, and indicates whether debug messages should be turned <b>on</b> or <b>off</b> for that subsystem. The value of <b><i>which</i></b> must be one of the following: <ul> <li> <b>deadlock </b>- Chooses the deadlocking code by using the DB_VERB_DEADLOCK value</li> <li> <b>recovery </b>- Chooses the recovery code by using the DB_VERB_RECOVERY value</li> <li> <b>wait </b>- Chooses the waitsfor code by using the DB_VERB_WAITSFOR value</li> </ul> <hr WIDTH="100%"> <p><a NAME="> <env> close"></a><b>> <env> close</b> <p>This command closes an environment and deletes the handle. This command directly translates to a call to the <a href="../../docs/api_c/env_close.html">DBENV->close</a> method call. It returns either a 0 (for success), a DB error message or it throws a Tcl error with a system message. <p>Additionally, since the handle is no longer valid, we will call <i>Tcl_DeleteCommand() </i>so that further uses of the handle will be dealt with properly by Tcl itself. <p>Also, the close command will automatically abort any <a href="txn.html">transactions</a> and close any <a href="mpool.html">mpool</a> memory files. As such we must maintain a list of open transaction and mpool handles so that we can call <i>Tcl_DeleteCommand</i> on those as well. <p> <hr WIDTH="100%"> <b>> berkdb envremove<br> [-data_dir <i>directory</i>]<br> [-force]<br> [-home <i>directory</i>]<br> [-log_dir <i>directory</i>]<br> [-overwrite]<br> [-tmp_dir <i>directory</i>]<br> [-use_environ]<br> [-use_environ_root]</b> <p>This command removes the environment if it is not in use and deletes the handle. This command directly translates to a call to the <a href="../../docs/api_c/env_remove.html">DBENV->remove</a> method call. It returns either a 0 (for success), a DB error message or it throws a Tcl error with a system message. The arguments are: <ul> <li> <b>-force</b> selects the DB_FORCE flag to remove even if other processes have the environment open</li> <li> <b>-home <i>directory</i> </b>specifies the home directory of the environment</li> <li> <b>-data_dir <i>directory </i></b>selects the data file directory of the environment by calling <a href="../../docs/api_c/env_set_data_dir.html">DBENV->set_data_dir</a>.</li> <li> <b>-log_dir <i>directory </i></b>selects the log file directory of the environment by calling <a href="../../docs/api_c/env_set_lg_dir.html">DBENV->set_lg_dir</a>.</li> <li> <b>-overwrite </b>sets DB_OVERWRITE flag</li> <li> <b>-tmp_dir <i>directory </i></b>selects the temporary file directory of the environment by calling <a href="../../docs/api_c/env_set_tmp_dir.so">DBENV->set_tmp_dir</a>.</li> <li> <b>-use_environ </b>selects the DB_USE_ENVIRON flag to affect file naming</li> <li> <b>-use_environ_root</b> selects the DB_USE_ENVIRON_ROOT flag to affect file naming</li> </ul> </body> </html>