11gR2新特性:Heavy swapping observed on system in last 5 mins.

在11gR2中DBRM(database resource manager，11gR2中新的后台进程，见 《Learning 11g New Background Processes》)会在Alert.log告警日志中反映OS操作系统最近5分钟是否有剧烈的swap活动了， 具体的日志如下：  

WARNING: Heavy swapping observed on system in last 5 mins.
pct of memory swapped in [3.07%] pct of memory swapped out [4.44%].
Please make sure there is no memory pressure and the SGA and PGA
are configured correctly. Look at DBRM trace file for more details.

  进一步诊断可以观察DBRM后台进程的trace：  

[oracle@vrh2 trace]$ cat VPROD2_dbrm_5466.trc
Trace file /s01/orabase/diag/rdbms/vprod/VPROD2/trace/VPROD2_dbrm_5466.trc
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
ORACLE_HOME = /s01/orabase/product/11.2.0/dbhome_1
System name: