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Linux内核的概念及版本说明
Linux内核的概念及版本说明[@more@]Linux kernel refers to the low-level system software that provides a hardware abstraction layer, disk and file system control,multitasking, load balancing, networking , and security enforcement.Linux kernel version numbers have the following format,<kernel_version>.<major_version>.<minor_version>.<patch>2.6之前没有<patch>kernel_version: in 1994 version 1.0 and in 1996 version 2.0major_version : the major revision of the kernel. even
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分析shared pool latch争用
分析shared pool latch争用[@more@]分析shared pool latch争用1.评估在子latches中的分布检查共享池中各种子latches的分布情况。看看是否是倾斜的。如果有倾斜的情况，这些subheaps也许正经历intense pressure.select child#, gets, misses, immediate_gets, immediate_misses from v$latch_children where name = 'shared pool';SQL> select child#, gets, misses, immediate_gets, immediate_misses from v$latch_children where name = 'shared pool'; CHILD# GETS MISSES IMMEDIATE_GETS IMMEDIATE_MISSES----------
