Db::sync
Db::sync |
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#include <db_cxx.h>int Db::sync(u_int32_t flags);
The Db::sync method flushes any cached information to disk.
If the database is in memory only, the Db::sync method has no effect and will always succeed.
The flags parameter is currently unused, and must be set to 0.
See Db::close for a discussion of Berkeley DB and cached data.
The Db::sync method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, 0 on success, and returns DB_INCOMPLETE if the underlying database still has dirty pages in the cache. (The only reason to return DB_INCOMPLETE is if another thread of control was writing pages in the underlying database file at the same time as the Db::sync method was being called. For this reason, a return of DB_INCOMPLETE can normally be ignored, or, in cases where it is a possible return value, there may be no reason to call Db::sync.)
The Db::sync method may fail and throw an exception or return a non-zero error for the following conditions:
The Db::sync 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. If a catastrophic error has occurred, the Db::sync method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
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