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關於oracle db 11gR2版本號上的_external_scn_rejection_threshold_hours參數和scn headroom補丁問題

來自於：
Installing, Executing and Interpreting output from the "scnhealthcheck.sql" script (文檔 ID 1393363.1)

第一點：

In addition to the above result the script output may advise to set the hidden parameter "_external_scn_rejection_threshold_hours" on some Oracle versions. The following text gives more information about setting this parameter:

Set _external_scn_rejection_threshold_hours=24 after apply
Oracle recommends setting this parameter to the value 24 in 10g and 11.1 releases - it does not need to be set in 11.2 or later releases. The parameter is static and so must be set in the init.ora or spfile used to start the instance.
eg:
In init.ora:
# Set threshold on dd/mon/yyyy - See MOS Document 1393363.1
_external_scn_rejection_threshold_hours = 24

In the spfile:
alter system set "_external_scn_rejection_threshold_hours" = 24
comment=‘Set threshold on dd/mon/yyyy - See MOS Document 1393363.1‘
scope=spfile ;

從以上能夠看出，在 11.2及其更高的版本號上，是無需設置_external_scn_rejection_threshold_hours參數的。

實際上。在11.2.0.4的db軟件中，該參數已經出如今隱含參數中了。

第二點：

Please note that there are no SCN hardening fixes for the following versions. The recommendation for these versions is to upgrade to a newer release:
  All versions up to and including 9.2.0.7
  Versions 10.1.0.2 to 10.1.0.4 inclusive
  Versions 10.2.0.1 and 10.2.0.2
  Version 11.1.0.6
  Version 11.2.0.1

從這句話能夠看出：以上版本號的oracle數據庫軟件沒有修復scn headroom 的補丁。請升級到更新的版本號。這一招夠狠的。

Versions 11.2.0.4 and 12.1.0.1 onwards already include the main SCN fixes but the "scnhealthcheck" script described above can still be used on those releases to check the current headroom.

從這句話能夠看出，在11.2.0.4及其12.1.0.1版本號上，已經包含了對scn問題的修復（fixes）,說白了。11.2.0.4及其12.1.0.1的程序版本號已經修復了scn headroom問題。

關於oracle db 11gR2版本號上的_external_scn_rejection_threshold_hours參數和scn headroom補丁問題