vm.min_free_kbytes = 2147484 参数，这几个机器都是512的内存。
主备库创建pfile文件
create pfile='/tmp/pfile0808.ora' from spfile;
备库取消应用日志
alter database recover managed standby database cancel;---取消应用
主库执行变更参数语句
alter system set sga_target=270G scope=spfile sid='*';
alter system set pga_aggregate_target=90G scope=both sid='*';
shutdown immediate
--回退---
startup pfile='/tmp/pfile0808.ora';
create spfile from pfile='/tmp/pfile0808.ora';
shutdown immediate
startup
备库应用日志
alter database recover managed standby database using current logfile disconnect from session;
Best Practices and Recommendations for RAC databases with SGA size over 100GB (文档 ID 1619155.1)
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