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Berkeley DB version 4.4.20 |
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java.lang.Object com.sleepycat.db.TransactionConfig
Specifies the attributes of a database environment transaction.
Field Summary | |
static TransactionConfig |
DEFAULT
Default configuration used if null is passed to methods that create a transaction. |
Constructor Summary | |
TransactionConfig()
An instance created using the default constructor is initialized with the system's default settings. |
Method Summary | |
boolean |
getDegree2()
Deprecated. This has been replaced by getReadCommitted() to conform to ANSI
database isolation terminology. |
boolean |
getDirtyRead()
Deprecated. This has been replaced by getReadUncommitted() to conform to ANSI
database isolation terminology. |
boolean |
getNoSync()
Return if the transaction is configured to not write or synchronously flush the log it when commits. |
boolean |
getNoWait()
Return if the transaction is configured to not wait if a lock request cannot be immediately granted. |
boolean |
getReadCommitted()
Return if the transaction is configured for read committed isolation. |
boolean |
getReadUncommitted()
Return if read operations performed by the transaction are configured to return modified but not yet committed data. |
boolean |
getSync()
Return if the transaction is configured to write and synchronously flush the log it when commits. |
void |
setDegree2(boolean degree2)
Deprecated. This has been replaced by setReadCommitted(boolean) to conform to ANSI
database isolation terminology. |
void |
setDirtyRead(boolean dirtyRead)
Deprecated. This has been replaced by setReadUncommitted(boolean) to conform to ANSI
database isolation terminology. |
void |
setNoSync(boolean txnNoSync)
Configure the transaction to not write or synchronously flush the log it when commits. |
void |
setNoWait(boolean noWait)
Configure the transaction to not wait if a lock request cannot be immediately granted. |
void |
setReadCommitted(boolean readCommitted)
Configure the transaction for read committed isolation. |
void |
setReadUncommitted(boolean readUncommitted)
Configure read operations performed by the transaction to return modified but not yet committed data. |
void |
setSync(boolean txnSync)
Configure the transaction to write and synchronously flush the log it when commits. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
public static final TransactionConfig DEFAULT
Constructor Detail |
public TransactionConfig()
Method Detail |
public void setReadUncommitted(boolean readUncommitted)
readUncommitted
- If true, configure read operations performed by the transaction to return
modified but not yet committed data.public boolean getReadUncommitted()
public void setDirtyRead(boolean dirtyRead)
setReadUncommitted(boolean)
to conform to ANSI
database isolation terminology.
dirtyRead
- If true, configure read operations performed by the transaction to return
modified but not yet committed data.
public boolean getDirtyRead()
getReadUncommitted()
to conform to ANSI
database isolation terminology.
public void setReadCommitted(boolean readCommitted)
This ensures the stability of the current data item read by the cursor but permits data read by this transaction to be modified or deleted prior to the commit of the transaction.
readCommitted
- If true, configure the transaction for read committed isolation.public boolean getReadCommitted()
public void setDegree2(boolean degree2)
setReadCommitted(boolean)
to conform to ANSI
database isolation terminology.
This ensures the stability of the current data item read by the cursor but permits data read by this transaction to be modified or deleted prior to the commit of the transaction.
degree2
- If true, configure the transaction for read committed isolation.
public boolean getDegree2()
getReadCommitted()
to conform to ANSI
database isolation terminology.
public void setSync(boolean txnSync)
This behavior may be set for a database environment using the Environment.setMutableConfig method. Any value specified to this method overrides that setting.
The default is false for this class and true for the database environment.
If true is passed to both setSync and setNoSync, setSync will take precedence.
txnSync
- If true, transactions exhibit all the ACID (atomicity, consistency,
isolation, and durability) properties.public boolean getSync()
public void setNoSync(boolean txnNoSync)
This behavior may be set for a database environment using the Environment.setMutableConfig method. Any value specified to this method overrides that setting.
The default is false for this class and the database environment.
txnNoSync
- If true, transactions exhibit the ACI (atomicity, consistency, and
isolation) properties, but not D (durability); that is, database
integrity will be maintained, but if the application or system
fails, it is possible some number of the most recently committed
transactions may be undone during recovery. The number of
transactions at risk is governed by how many log updates can fit
into the log buffer, how often the operating system flushes dirty
buffers to disk, and how often the log is checkpointed.public boolean getNoSync()
public void setNoWait(boolean noWait)
The default is false for this class and the database environment.
noWait
- If true, transactions will not wait if a lock request cannot be
immediately granted, instead DeadlockException
will be thrown.public boolean getNoWait()
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Berkeley DB version 4.4.20 |
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