Class B2ICostController

java.lang.Object

org.apache.derby.impl.store.access.btree.OpenBTree

org.apache.derby.impl.store.access.btree.BTreeCostController

org.apache.derby.impl.store.access.btree.index.B2ICostController

All Implemented Interfaces:

RowCountable, StoreCostController

public class B2ICostController
extends BTreeCostController

Controller used to provide cost estimates to optimizer about secondary index data access. Implements the StoreCostController interface for the B-Tree index implementation. The primary use of this interface is to provide costs used by the query optimizer to use when choosing query plans. Provides costs of things like fetch one row, how many rows in conglomerate, how many rows between these 2 keys. Note most work of this class is inherited from the generic btree implementation. This class initializes the top level object and deals with locking information specific to a secondary index implementation of a btree.

Field Summary

Fields inherited from class OpenBTree

btree_undo, container, err_containerid, init_lock_level, init_open_user_scans, runtime_mem

Fields inherited from interface StoreCostController

BASE_CACHED_ROW_FETCH_COST, BASE_GROUPSCAN_ROW_COST, BASE_HASHSCAN_ROW_FETCH_COST, BASE_NONGROUPSCAN_ROW_FETCH_COST, BASE_ROW_PER_BYTECOST, BASE_UNCACHED_ROW_FETCH_COST, STORECOST_CLUSTERED, STORECOST_SCAN_NORMAL, STORECOST_SCAN_SET

Constructor Summary

Constructors

Constructor	Description
B2ICostController()

Method Summary

Modifier and Type	Method	Description
(package private) void	init(TransactionManager xact_manager, B2I conglomerate, Transaction rawtran)

Methods inherited from class BTreeCostController

close, getFetchFromFullKeyCost, getFetchFromRowLocationCost, getScanCost, init, newRowLocationTemplate

Methods inherited from class OpenBTree

checkConsistency, debugConglomerate, getColumnSortOrderInfo, getConglomerate, getContainer, getContainerHandle, getEstimatedRowCount, getHeight, getHold, getLockingPolicy, getLockLevel, getOpenMode, getRawTran, getRuntimeMem, getSpaceInfo, getXactMgr, init, isClosed, isTableLocked, reopen, setEstimatedRowCount, setLockingPolicy, test_errors

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface RowCountable

getEstimatedRowCount, setEstimatedRowCount

Constructor Details

B2ICostController

B2ICostController()

Method Details

init

void init(TransactionManager xact_manager,
 B2I conglomerate,
 Transaction rawtran)
   throws StandardException

Throws:

StandardException