OptimizerFactory

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Class

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org.apache.derby.iapi.sql.compile
Interface OptimizerFactory

public interface OptimizerFactory

This is simply the factory for creating an optimizer.

There is expected to be only one of these configured per database.

Field Summary

static java.lang.String MODULE
          Module name for the monitor's module locating system.

Method Summary

CostEstimate getCostEstimate()
          Return a new CostEstimate.

int getMaxMemoryPerTable()
          Return the maxMemoryPerTable setting, this is used in optimizer, as well as subquery materialization at run time.

Optimizer getOptimizer(OptimizableList optimizableList, OptimizablePredicateList predicateList, org.apache.derby.iapi.sql.dictionary.DataDictionary dDictionary, RequiredRowOrdering requiredRowOrdering, int numTablesInQuery, org.apache.derby.iapi.sql.conn.LanguageConnectionContext lcc)
          Only one optimizer level should exist in the database, however, the connection may have multiple instances of that optimizer at a given time.

boolean supportsOptimizerTrace()
          Return whether or not the optimizer associated with this factory supports optimizer trace.

Field Detail

MODULE

public static final java.lang.String MODULE

Module name for the monitor's module locating system.

See Also:: Constant Field Values

Method Detail

getOptimizer

public Optimizer getOptimizer(OptimizableList optimizableList,
                              OptimizablePredicateList predicateList,
                              org.apache.derby.iapi.sql.dictionary.DataDictionary dDictionary,
                              RequiredRowOrdering requiredRowOrdering,
                              int numTablesInQuery,
                              org.apache.derby.iapi.sql.conn.LanguageConnectionContext lcc)
                       throws org.apache.derby.iapi.error.StandardException

Only one optimizer level should exist in the database, however, the connection may have multiple instances of that optimizer at a given time.

getCostEstimate

public CostEstimate getCostEstimate()
                             throws org.apache.derby.iapi.error.StandardException

Return a new CostEstimate.

supportsOptimizerTrace

public boolean supportsOptimizerTrace()

Return whether or not the optimizer associated with this factory supports optimizer trace.

getMaxMemoryPerTable

public int getMaxMemoryPerTable()

Return the maxMemoryPerTable setting, this is used in optimizer, as well as subquery materialization at run time.