一 其他池(Java池、流池)
Java池,也是系统全局区中一个可选内存区,用于Java程序的解释和 执行,大小由参数JAVA_POOL_SIZE决定,也可以动态调整。如果granule是4M,Java池默认是24M;如果 granule是16M,默认大小是32M。如果在数据库创建时选择了安装JVM组件,那么这个池必须配置。
Java Pool
Java pool memoryis used in server memory for all session-specific Java code and data within theJVM. Java pool memory is used in different ways, depending on the mode in whichOracle Database is running.
The Java PoolAdvisor statistics provide information about library cache memory used for Javaand predict how changes in the size of the Java pool can affect the parse rate.The Java Pool Advisor is internally turned on when statistics_level is set toTYPICAL or higher. These statistics reset when the advisor is turned off.
Streams Pool
The streams poolis used exclusively by Oracle Streams. The Streams pool stores buffered queuemessages, and it provides memory for Oracle Streams capture processes and applyprocesses.
Unless youspecifically configure it, the size of the Streams pool starts at zero. Thepool size grows dynamically as needed when Oracle Streams is used.
二 操作示例
SQL> show parameter java_pool_size; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ java_pool_size big integer 0 SQL> show parameter streams_pool_size; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ streams_pool_size big integer 0 SQL> SELECT name, bytes/1024/1024 MB, resizeable from v$sgainfo; NAME MB RES -------------------------------- ---------- --- Fixed SGA Size 1.16557312 No Redo Buffers 2.83203125 No Buffer Cache Size 88 Yes Shared Pool Size 52 Yes Large Pool Size 12 Yes Java Pool Size 4 Yes Streams Pool Size 0 Yes Granule Size 4 No Maximum SGA Size 800 No Startup overhead in Shared Pool 36 No Free SGA Memory Available 640 11 rows selected. --Java池,否则占用共享池一般设置成24M或者32M SQL> alter system set java_pool_size=24M; System altered. SQL> alter system set streams_pool_size=12M; System altered. SQL> show parameter java_pool_size; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ java_pool_size big integer 24M --10.2开始的版本流池才开始自动管理 --粒度4M,设置成24M,粒度为16M,设置成32M SQL> show parameter streams_pool_size; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ streams_pool_size big integer 12M --sga中除了log buffer不能被自动管理,需要单独设置大小,其他的比如--shared_pool_size、 db_cahe_size、large_pool_size、java_pool_size、--streams_pool_size都可被自动管理,这些池需要设 置初始大小。流池在10G R2中自动管理 --sga分配: --1.sga_max_size=内存大小的80% * 2/3
三 总结
1.Java池,也是系统全局区中一个可选 内存区,用于Java程序的解释和执行,大小由参数JAVA_POOL_SIZE决定,也可以动态调整。
2.其他池 包括Java池和Streams池。
3.可以通过参数java_pool_size 和streams_pool_size查看Java池和流池 的大小。
以上是小编为您精心准备的的内容,在的博客、问答、公众号、人物、课程等栏目也有的相关内容,欢迎继续使用右上角搜索按钮进行搜索java
, pool
, 大小
, parameter
, size
, Streams
, size()
sizing
oracle sga、oracle sga 调整、oracle sga pga、oracle修改sga大小、oracle sga pga 设置,以便于您获取更多的相关知识。