B2ICostController (Apache Derby V10.14 Internals)

Skip navigation links

All Classes

SEARCH:

Summary:
Nested |
Field |
Constr |
Method

Detail:
Field |
Constr |
Method

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 org.apache.derby.impl.store.access.btree.OpenBTree
  btree_undo, container, err_containerid, init_lock_level, init_open_user_scans, runtime_mem
- 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

Constructor Summary

Constructors
Constructor Description

B2ICostController()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`(package private) void`	`init(TransactionManager xact_manager, B2I conglomerate, Transaction rawtran)`

Methods inherited from class org.apache.derby.impl.store.access.btree.BTreeCostController
close, getFetchFromFullKeyCost, getFetchFromRowLocationCost, getScanCost, init, newRowLocationTemplate

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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

Methods inherited from interface org.apache.derby.iapi.store.access.RowCountable
getEstimatedRowCount, setEstimatedRowCount

Constructor Detail
- B2ICostController
```
B2ICostController()
```

Method Detail

init

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

Throws:: StandardException

Skip navigation links

Built on Wed 2018-05-16 16:01:03+0000, from revision ???

All Classes

Summary:
Nested |
Field |
Constr |
Method

Detail:
Field |
Constr |
Method

Apache Derby V10.14 Internals - Copyright © 2004,2018 The Apache Software Foundation. All Rights Reserved.