[bbk5138] 第48集 - 第五章 管理内存 03
Java Pool and Streams Pool
- Java pool memory is used in server memory for all session-specific Java code and data in the JVM.
- Streams pool memory is used exclusively by Oracle Streams to:
- Store buffered queue messages
- Provide memory for Oracle Streams processes
Redo Log Buffer
- Is a circular buffer in the SGA
- Holds information about changes made to the database
- Contains redo entries that have the information to redo changes made by operations such as DML and DDL
Content transferred by log writer process(LGWR):
- When a user process commits a transaction
- When the redo log buffer is one-third full
- Before a DBWn process writes modified buffers to disk
Oracle Database Memory Parameters
使用Spfile的好处:
spfile是二进制文件.Oracle在运行的过程中，会自动调整各个参数大小，已达到最优的目标；在进行shutdown的时候Oracle会将参数数据保存到spfile中，等下次再启动的时候，会直接使用spfile中的数据.
