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Berkeley DB: DB_ENV->txn_recover
DB_ENV->txn_recover
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#include <db.h>
int
DB_ENV->txn_recover(DB_ENV *dbenv, DB_PREPLIST preplist[],
long count, long *retp, u_int32_t flags);
Description: DB_ENV->txn_recover
The DB_ENV->txn_recover method returns a list of prepared but not yet resolved
transactions. The DB_ENV->txn_recover method should only be called after the
environment has been recovered. Because database environment state must
be preserved between recovery and the application calling
DB_ENV->txn_recover, applications must either call DB_ENV->txn_recover
using the same environment handle used when recovery is done, or the
database environment must not be configured using the DB_PRIVATE
flag.
On return from DB_ENV->txn_recover, the preplist parameter will
be filled in with a list of transactions that must be resolved by the
application (committed, aborted or discarded). The preplist
parameter is a structure of type DB_PREPLIST; the following DB_PREPLIST
fields will be filled in:
- DB_TXN * txn;
- The transaction handle for the transaction.
- u_int8_t gid[DB_XIDDATASIZE];
- The global transaction ID for the transaction. The global transaction
ID is the one specified when the transaction was prepared. The
application is responsible for ensuring uniqueness among global
transaction IDs.
The application must call DB_TXN->abort, DB_TXN->commit or
DB_TXN->discard on each returned DB_TXN handle before
starting any new operations.
The DB_ENV->txn_recover method
returns a non-zero error value on failure
and 0 on success.
Parameters
- count
- The count parameter specifies the number of available entries
in the passed-in preplist array. The retp parameter
returns the number of entries DB_ENV->txn_recover has filled in, in the
array.
- flags
- The flags parameter must be set to one of the following values:
- DB_FIRST
- Begin returning a list of prepared, but not yet resolved transactions.
- DB_NEXT
- Continue returning a list of prepared, but not yet resolved transactions,
starting where the last call to DB_ENV->txn_recover left off.
- preplist
- The preplist parameter references memory into which
the list of transactions to be resolved by the application is copied.
Class
DB_ENV, DB_TXN
See Also
Transaction Subsystem and Related Methods
Copyright (c) 1996-2004 Sleepycat Software, Inc. - All rights reserved.
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