Package oracle.kv
Enum Durability.SyncPolicy
- java.lang.Object
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- java.lang.Enum<Durability.SyncPolicy>
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- oracle.kv.Durability.SyncPolicy
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- 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 Constants Enum Constant Description NO_SYNC
Do not write or synchronously flush the log on transaction commit.SYNC
Write and synchronously flush the log on transaction commit.WRITE_NO_SYNC
Write but do not synchronously flush the log on transaction commit.
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static Durability.SyncPolicy
valueOf(String name)
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.
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Enum Constant Detail
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SYNC
public static final Durability.SyncPolicy SYNC
Write and synchronously flush the log on transaction commit. Transactions exhibit all the ACID (atomicity, consistency, isolation, and durability) properties.
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NO_SYNC
public static final Durability.SyncPolicy 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.
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WRITE_NO_SYNC
public static final Durability.SyncPolicy 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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Method Detail
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values
public static Durability.SyncPolicy[] values()
Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:for (Durability.SyncPolicy c : Durability.SyncPolicy.values()) System.out.println(c);
- Returns:
- an array containing the constants of this enum type, in the order they are declared
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valueOf
public static Durability.SyncPolicy valueOf(String name)
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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