Package oracle.kv

Enum Durability.SyncPolicy

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<Durability.SyncPolicy>, oracle.kv.impl.util.FastExternalizable
    Enclosing class:
    Durability
    public static enum Durability.SyncPolicy
extends java.lang.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.

    • 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.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static int VALUES_COUNT  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static Durability.SyncPolicy valueOf​(java.lang.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.

      • Methods inherited from class java.lang.Enum

        clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait

      • Methods inherited from interface oracle.kv.impl.util.FastExternalizable

        deserializedForm

    • Enum Constant Detail

      • 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.

      • 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.

      • 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.

    • Field Detail

      • VALUES_COUNT

        public static final int VALUES_COUNT

    • Method Detail

      • 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

      • valueOf

        public static Durability.SyncPolicy valueOf​(java.lang.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:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null