zoukankan      html  css  js  c++  java
  • Summary of Memory Management Methods

    Summary of Memory Management Methods

    Table 18-1 summarizes the various memory management methods. If you do not enable automatic memory management, then you must separately configure one memory management method for the SGA and one for the PGA.

    Note:

    When automatic memory management is not enabled, the default method for the instance PGA is automatic PGA memory management.

    Table 18-1 Memory Management Methods

    InstanceSGAPGADescriptionInitialization Parameters

    Auto

    n/a

    n/a

    The database tunes the size of the instance based on a single instance target size.

    You set:

    • Total memory target size for the database instance (MEMORY_TARGET)

    • Optional maximum memory size for the database instance (MEMORY_MAX_TARGET)

    n/a

    Auto

    Auto

    The database automatically tunes the SGA based on an SGA target.

    The database automatically tunes the PGA based on a PGA target.

    You set:

    • SGA target size (SGA_TARGET)

    • Optional SGA maximum size (SGA_MAX_SIZE)

    • Instance PGA target size (PGA_AGGREGATE_TARGET)

    n/a

    Auto

    Manual

    The database automatically tunes the SGA based on an SGA target.

    You control the PGA manually, setting the maximum work area size for each type of SQL operator.

    You set:

    • SGA target size (SGA_TARGET)

    • Optional SGA maximum size (SGA_MAX_SIZE)

    • PGA work area parameters such as SORT_AREA_SIZE, HASH_AREA_SIZE, and BITMAP_MERGE_AREA_SIZE

    n/a

    Manual

    Auto

    You control the SGA manually by setting individual component sizes.

    The database automatically tunes the PGA based on a PGA target.

    You set:

    • Shared pool size (SHARED_POOL_SIZE)

    • Buffer cache size (DB_CACHE_SIZE)

    • Large pool size (LARGE_POOL_SIZE)

    • Java pool size (JAVA_POOL_SIZE)

    • Streams pool size (STREAMS_POOL_SIZE)

    • Instance PGA target size (PGA_AGGREGATE_TARGET)

    n/a

    Manual

    Manual

    You must manually configure SGA component sizes.

    You control the PGA manually, setting the maximum work area size for each type of SQL operator.

    You must manually configure SGA component sizes. You set:

    • Shared pool size (SHARED_POOL_SIZE)

    • Buffer cache size (DB_CACHE_SIZE)

    • Large pool size (LARGE_POOL_SIZE)

    • Java pool size (JAVA_POOL_SIZE)

    • Streams pool size (STREAMS_POOL_SIZE)

    • PGA work area parameters such as SORT_AREA_SIZE, HASH_AREA_SIZE, and BITMAP_MERGE_AREA_SIZE

    See Also:

    Oracle Database Administrator's Guide because automatic memory management is not available on all platforms
     
  • 相关阅读:
    安装nginx
    查看Linux内核
    Python学习总结11:获取当前运行类名和函数名
    Python学习总结10:获取shell输出结果
    Python学习总结9:目录操作方法汇总
    Python学习总结8:文件模式及操作方法汇总
    Python学习总结7:随机字符串和随机数
    Python学习总结6:字符串格式化操作及方法总结
    Python学习总结5:数据类型及转换
    Python学习总结4:字符串常量与操作汇总
  • 原文地址:https://www.cnblogs.com/seasonzone/p/4482166.html
Copyright © 2011-2022 走看看