最近幫一個(gè)好哥們處理了一個(gè)數(shù)據(jù)庫(kù)系統(tǒng)性能問(wèn)題，經(jīng)過(guò)分析awr報(bào)告查看官方文檔，發(fā)現(xiàn)一處12.1.0.2的bug,正好客戶有服務(wù)，開了SR，官方回復(fù)郵件確認(rèn)此問(wèn)題。

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安裝此版本的生產(chǎn)系統(tǒng)，可以把相關(guān)參數(shù)（_notify_crs=false）關(guān)閉掉。

部分awr截圖如下：

APPLIES TO:

Oracle Database - Enterprise Edition - Version 11.2.0.3 and later
Information in this document applies to any platform.

SYMPTOMS

o Grid Infrastructure home and rdbms home is running on 11.2.0.3.7.
o Database instance fail to start, with ORA-7445 [strstr()]

o The failing process is gen0, and the current Wait Stack shows waiting for 'CRS call completion'

o The call stack of the error is:

ORA-07445: exception encountered: core dump [strstr()] [SIGSEGV] [ADDR:0x0] [PC:0x3EC307A310] [SI_KERNEL(general_protection)]

Call stack:

[]skdstdst<-ksedst1<-ksedst<-dbkedDefDump<-ksedmp<-ssexhd<-__sighandler<-strstr<-clsrapii_rem_dep

CAUSE

Due to

BUG 22999793 - ORA-07445 [__STRSTR_SSE42()+10] - SIMILAR TO BUG 17230892 THAT CT IS HITTING

SOLUTION

The bug fix is included in 12.2.0.2, request/apply the patch if there's an impact.

The workaround for successful startup of instance is by setting hidden parameter "_notify_crs"=false, which will prevent the database instance from notifying the CRS daemon process.