oracle中出現ORA-12850錯誤怎么辦

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1.問題現象
報錯信息如下：

Thu Aug 24 10:01:33 2017

Errors in file /oradata/diag/rdbms/cdb/cdb2/trace/cdb2_m000_3564.trc:

ORA-12850: 無法在所有指定實例上分配從屬進程:需要2,已分配1

trace 文件部分輸出輸出：
*** 2017-08-24 10:01:33.324
*** SESSION ID:(1390.13783) 2017-08-24 10:01:33.324
*** CLIENT ID:() 2017-08-24 10:01:33.324
*** SERVICE NAME:(SYS$BACKGROUND) 2017-08-24 10:01:33.324
*** MODULE NAME:(MMON_SLAVE) 2017-08-24 10:01:33.324
*** CLIENT DRIVER:() 2017-08-24 10:01:33.324
*** ACTION NAME:(Automatic Report Flush) 2017-08-24 10:01:33.324
*** CONTAINER ID:(1) 2017-08-24 10:01:33.324

2、報錯分析
在mos找到了2篇文章和此次報錯相吻合
ORA-12850 is Raised by Mmon Slave Automatic Report Flush Action (文檔 ID 2217969.1)
High CPU Usage and/or Frequent Occurrences of ORA-12850 For Monitor Queries by MMON From 12.1 (文檔 ID 2102131.1)
文中提到引起問題的原因：
bug:24554937 ORA-12850 WHILE MMON SLAVE AUTOMATIC REPORT FLUSH ACTION

There is a new feature in 12C called "Automatic Report Capturing Feature". As part of this feature, some monitoring SQLs are executed by MMON_SLAVE to identify the resource-intensive SQLs and generate the SQL Monitoring report automatically for those SQLs. Those SQLs consume little more CPU and it is expected behavior being a new feature. Such monitoring queries can be identified from (G)V$SQLSTATS.
==》大致意思是說12.1，引入了 "Automatic Report Capturing Feature"這個新特性，monitoring SQLs被執行以便收集resource-intensive SQLs信息，生成SQL Monitoring report.當monitoring SQLs消耗過高的cpu時會報ORA-12850.

3.解決方案
文章中提供了2中解決方案：
1.Apply Patch 24554937 if it is available for your version and platform.
2.執行以下sql禁用新特性
SQL> alter system set "_report_capture_cycle_time"=0;

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