/// <summary>
/// Return pages to the filesystem that are already free and at the end
/// of the file.
/// </summary>
/// <param name="txn">
/// If the operation is part of an application-specified transaction,
/// <paramref name="txn"/> is a Transaction object returned from
/// <see cref="DatabaseEnvironment.BeginTransaction"/>; if
/// the operation is part of a Berkeley DB Concurrent Data Store group,
/// <paramref name="txn"/> is a handle returned from
/// <see cref="DatabaseEnvironment.BeginCDSGroup"/>; otherwise null.
/// </param>
/// <returns>
/// The number of database pages returned to the filesystem
/// </returns>
public uint TruncateUnusedPages(Transaction txn)
{
DB_COMPACT cdata = new DB_COMPACT();
db.compact(Transaction.getDB_TXN(txn),
null, null, cdata, DbConstants.DB_FREELIST_ONLY, null);
return(cdata.compact_pages_truncated);
}
private void doCompaction()
{
cdata = new DB_COMPACT();
if (fillPctSet)
{
cdata.compact_fillpercent = fillpct;
}
if (pgsSet)
{
cdata.compact_pages = pgs;
}
if (tmoutSet)
{
cdata.compact_timeout = tmout;
}
}
internal CompactData(DB_COMPACT dbcompact, DatabaseEntry end)
{
cdata = dbcompact;
_end = end;
}