Other SGA Initialization Parameters (96)

最新推荐文章于 2025-12-10 23:46:53 发布

转载最新推荐文章于 2025-12-10 23:46:53 发布 · 98 阅读

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本文介绍了如何使用多个初始化参数来控制SGA如何使用内存，包括锁定SGA在物理内存中的LOCK_SGA参数，设置SGA运行时起始地址的SHARED_MEMORY_ADDRESS和HI_SHARED_MEMORY_ADDRESS参数，以及为32位平台启用扩展缓存机制的USE_INDIRECT_DATA_BUFFERS参数。

You can use several initialization parameters to control how the SGA uses memory.
Physical Memory
The LOCK_SGA parameter locks the SGA into physical memory.
SGA Starting Address
The SHARED_MEMORY_ADDRESS and HI_SHARED_MEMORY_ADDRESS parameters
specify the SGA's starting address at runtime. These parameters are rarely used. For
64-bit platforms, HI_SHARED_MEMORY_ADDRESS specifies the high order 32 bits of the
64-bit address.
Extended Buffer Cache Mechanism
The USE_INDIRECT_DATA_BUFFERS parameter enables the use of the extended
buffer cache mechanism for 32-bit platforms that can support more than 4 GB of
physical memory. On platforms that do not support this much physical memory, this
parameter is ignored.

其他有关sga的初始化参数
lock_sga : 将sga锁定在物理内存中
USE_INDIRECT_DATA_BUFFERS : 32位平台通过扩展buffer cache机制来支持4G的物理内存, 平台中该参数被忽略

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