LockMode (Sleepycat Software, Inc. - Berkeley DB Java API)
Keywords: com.sleepycat.db.LockMode class

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| Berkeley DB version 4.3.29
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## com.sleepycat.db
Class LockMode

    java.lang.Object
      com.sleepycat.db.LockMode

public final class LockMode
extends Object

Locking modes for database operations. Locking modes are required parameters for operations that retrieve data or modify the database.

Field Summary
`static LockMode` | `DEFAULT` Acquire read locks for read operations and write locks for write operations.
`static LockMode` | `DEGREE_2` Degree 2 isolation provides for cursor stability but not repeatable reads.
`static LockMode` | `DIRTY_READ` Read modified but not yet committed data.
`static LockMode` | `RMW` Acquire write locks instead of read locks when doing the retrieval.

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

Field Detail

### DEFAULT

    public static final LockMode DEFAULT

  Acquire read locks for read operations and write locks for write operations.

### DIRTY_READ

    public static final LockMode DIRTY_READ

  Read modified but not yet committed data.

### RMW

    public static final LockMode RMW

  Acquire write locks instead of read locks when doing the retrieval. Setting this flag can eliminate deadlock during a read-modify-write cycle by acquiring the write lock during the read part of the cycle so that another thread of control acquiring a read lock for the same item, in its own read-modify-write cycle, will not result in deadlock.

### DEGREE_2

    public static final LockMode DEGREE_2

  Degree 2 isolation provides for cursor stability but not repeatable reads. Data items which have been previously read by this cursor or transaction may be deleted or modified by other transactions before the cursor is closed or the transaction completes.

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| Berkeley DB version 4.3.29
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Copyright (c) 1996-2004 Sleepycat Software, Inc. - All rights reserved.