# Db.set_feedback

`

###

    import com.sleepycat.db.*;

    public interface DbFeedback
    {
    	public abstract void db_feedback(Db db, int opcode, int pct);
    }
    public class Db
    {
    	public void set_feedback(DbFeedback db_feedback)
    		throws DbException;
    	...
    }

# Description

Some operations performed by the Berkeley DB library can take non-trivial amounts of time. The Db.set_feedback method can be used by applications to monitor progress within these operations.

When an operation is likely to take a long time, Berkeley DB will call the specified callback method. This method must be declared with three arguments: the first will be a reference to the enclosing database handle, the second a flag value, and the third the percent of the operation that has been completed, specified as an integer value between 0 and 100. It is up to the callback method to display this information in an appropriate manner.

The opcode argument may take on any of the following values:

Db.DB_UPGRADE
  The underlying database is being upgraded.

Db.DB_VERIFY
  The underlying database is being verified.

The Db.set_feedback interface may be used to configure Berkeley DB at any time during the life of the application.

The Db.set_feedback method throws an exception that encapsulates a non-zero error value on failure.

### Class

Db

# See Also

Db.close, Db.cursor, Db.del, Db.fd, Db.get, Db.get_byteswapped, Db.get_type, Db.join, Db.key_range, Db.open, Db.put, Db.remove, Db.set_bt_minkey, Db.set_cachesize, Db.set_errcall, Db.set_errpfx, Db.set_flags, Db.set_h_ffactor, Db.set_h_nelem, Db.set_lorder, Db.set_pagesize, Db.set_q_extentsize, Db.set_re_delim, Db.set_re_len, Db.set_re_pad, Db.set_re_source, Db.stat, Db.sync, Db.upgrade and Db.verify.`

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