Class B2ICostController
- java.lang.Object
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- org.apache.derby.impl.store.access.btree.OpenBTree
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- org.apache.derby.impl.store.access.btree.BTreeCostController
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- org.apache.derby.impl.store.access.btree.index.B2ICostController
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- 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.
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Field Summary
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Fields inherited from class org.apache.derby.impl.store.access.btree.OpenBTree
btree_undo, container, err_containerid, init_lock_level, init_open_user_scans, runtime_mem
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Fields inherited from interface org.apache.derby.iapi.store.access.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
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Constructor Summary
Constructors Constructor Description B2ICostController()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description (package private) void
init(TransactionManager xact_manager, B2I conglomerate, Transaction rawtran)
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Methods inherited from class org.apache.derby.impl.store.access.btree.BTreeCostController
close, getFetchFromFullKeyCost, getFetchFromRowLocationCost, getScanCost, init, newRowLocationTemplate
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Methods inherited from class org.apache.derby.impl.store.access.btree.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
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.apache.derby.iapi.store.access.RowCountable
getEstimatedRowCount, setEstimatedRowCount
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Method Detail
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init
void init(TransactionManager xact_manager, B2I conglomerate, Transaction rawtran) throws StandardException
- Throws:
StandardException
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