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Clarify doc: mdb_copy, nested txns, mdb_drop().

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mdb_copy: Does not copy lockfile. Can trigger file growth.
mdb_txn_begin(): Clarify usage restrictions.
mdb_drop(): State what to do rather than what will be done, since
closing the handle could otherwise be read as happening even at failure.
This commit is contained in:
Hallvard Furuseth 2013-08-05 09:55:48 +02:00
parent 2cc2574d84
commit 6214423163
2 changed files with 19 additions and 7 deletions
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21
libraries/liblmdb/lmdb.h
View file

@ -138,6 +138,7 @@
extern "C" {
#endif
/** Unix permissions for creating files, or dummy definition for Windows */
#ifdef _MSC_VER
typedef int mdb_mode_t;
#else
@ -534,6 +535,10 @@ int mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mdb_mode_t
/** @brief Copy an MDB environment to the specified path.
*
* This function may be used to make a backup of an existing environment.
* No lockfile is created, since it gets recreated at need.
* @note This call can trigger significant file size growth if run in
* parallel with write transactions, because it employs a read-only
* transaction. See long-lived transactions under @ref caveats_sec.
* @param[in] env An environment handle returned by #mdb_env_create(). It
* must have already been opened successfully.
* @param[in] path The directory in which the copy will reside. This
@ -546,6 +551,10 @@ int mdb_env_copy(MDB_env *env, const char *path);
/** @brief Copy an MDB environment to the specified file descriptor.
*
* This function may be used to make a backup of an existing environment.
* No lockfile is created, since it gets recreated at need.
* @note This call can trigger significant file size growth if run in
* parallel with write transactions, because it employs a read-only
* transaction. See long-lived transactions under @ref caveats_sec.
* @param[in] env An environment handle returned by #mdb_env_create(). It
* must have already been opened successfully.
* @param[in] fd The filedescriptor to write the copy to. It must
@ -718,8 +727,8 @@ int mdb_env_set_maxdbs(MDB_env *env, MDB_dbi dbs);
* @param[in] parent If this parameter is non-NULL, the new transaction
* will be a nested transaction, with the transaction indicated by \b parent
* as its parent. Transactions may be nested to any level. A parent
* transaction may not issue any other operations besides mdb_txn_begin,
* mdb_txn_abort, or mdb_txn_commit while it has active child transactions.
* transaction and its cursors may not issue any other operations than
* mdb_txn_commit and mdb_txn_abort while it has active child transactions.
* @param[in] flags Special options for this transaction. This parameter
* must be set to 0 or by bitwise OR'ing together one or more of the
* values described here.
@ -909,14 +918,12 @@ int mdb_dbi_flags(MDB_env *env, MDB_dbi dbi, unsigned int *flags);
*/
void mdb_dbi_close(MDB_env *env, MDB_dbi dbi);
/** @brief Delete a database and/or free all its pages.
/** @brief Empty or delete+close a database.
*
* If the \b del parameter is 1, the DB handle will be closed
* and the DB will be deleted.
* @param[in] txn A transaction handle returned by #mdb_txn_begin()
* @param[in] dbi A database handle returned by #mdb_dbi_open()
* @param[in] del 1 to delete the DB from the environment,
* 0 to just free its pages.
* @param[in] del 0 to empty the DB, 1 to delete it from the
* environment and close the DB handle.
* @return A non-zero error value on failure and 0 on success.
*/
int mdb_drop(MDB_txn *txn, MDB_dbi dbi, int del);

5
libraries/liblmdb/mdb_copy.1
View file

@ -11,6 +11,7 @@ The
.B mdb_copy
utility copies an LMDB environment. The environment can
be copied regardless of whether it is currently in use.
No lockfile is created, since it gets recreated at need.
If
.I dstpath
@ -22,6 +23,10 @@ written to stdout.
Exit status is zero if no errors occur.
Errors result in a non-zero exit status and
a diagnostic message being written to standard error.
.SH CAVEATS
This utility can trigger significant file size growth if run
in parallel with write transactions, because pages which they
free during copying cannot be reused until the copy is done.
.SH "SEE ALSO"
.BR mdb_stat (1)
.SH AUTHOR