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Oracle® Database Administrator's Guide
11g Release 2 (11.2)

Part Number E17120-11
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Memory Architecture Overview

The basic memory structures associated with Oracle Database include:

Figure 6-1 illustrates the relationships among these memory structures.

Figure 6-1 Oracle Database Memory Structures

Description of Figure 6-1 follows
Description of "Figure 6-1 Oracle Database Memory Structures"

If your database is running on Solaris or Oracle Linux, you can optionally add another memory component: Database Smart Flash Cache (the flash cache). The flash cache is an extension of the SGA-resident buffer cache, providing a level 2 cache for database blocks. It can improve response time and overall throughput, especially for read-intensive online transaction processing (OLTP) workloads. The flash cache resides on one or more flash disk devices, which are solid state storage devices that use flash memory.

The flash cache is typically more economical than additional main memory, and is an order of magnitude faster than disk drives.

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