Package oracle.kv
Enum Durability.SyncPolicy
- All Implemented Interfaces:
Serializable
,Comparable<Durability.SyncPolicy>
,oracle.kv.impl.util.FastExternalizable
- Enclosing class:
- Durability
public static enum Durability.SyncPolicy
extends Enum<Durability.SyncPolicy>
implements oracle.kv.impl.util.FastExternalizable
Defines the synchronization policy to be used when committing a
transaction. High levels of synchronization offer a greater guarantee
that the transaction is persistent to disk, but trade that off for
lower performance.
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Enum Constant Summary
Enum ConstantsEnum ConstantDescriptionDo not write or synchronously flush the log on transaction commit.Write and synchronously flush the log on transaction commit.Write but do not synchronously flush the log on transaction commit. -
Field Summary
Fields -
Method Summary
Modifier and TypeMethodDescriptionstatic Durability.SyncPolicy
Returns the enum constant of this type with the specified name.static Durability.SyncPolicy[]
values()
Returns an array containing the constants of this enum type, in the order they are declared.Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
Methods inherited from interface oracle.kv.impl.util.FastExternalizable
deserializedForm
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Enum Constant Details
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SYNC
Write and synchronously flush the log on transaction commit. Transactions exhibit all the ACID (atomicity, consistency, isolation, and durability) properties. -
NO_SYNC
Do not write or synchronously flush the log on transaction commit. 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 log checkpoints occur. -
WRITE_NO_SYNC
Write but do not synchronously flush the log on transaction commit. Transactions exhibit the ACI (atomicity, consistency, and isolation) properties, but not D (durability); that is, database integrity will be maintained, but if the operating 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 often the operating system flushes dirty buffers to disk, and how often log checkpoints occur.
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Field Details
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VALUES_COUNT
public static final int VALUES_COUNT
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Method Details
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values
Returns an array containing the constants of this enum type, in the order they are declared.- Returns:
- an array containing the constants of this enum type, in the order they are declared
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valueOf
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)- Parameters:
name
- the name of the enum constant to be returned.- Returns:
- the enum constant with the specified name
- Throws:
IllegalArgumentException
- if this enum type has no constant with the specified nameNullPointerException
- if the argument is null
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