# Db.set_feedback

`

###

    import com.sleepycat.db.*;

    public interface DbFeedback
    {
        public abstract void 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 called 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

Databases and Related Methods`

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