? 將oracle 10g報表庫遷移到 oracle 11g上發現有個存儲過程編譯時報ora-00979錯誤，經確定是group by 后面加的游標不能使用，后來用metlink查詢發現是11g的一個bug：

ORA-979 bugs on 11.2.0.1 [ID 1085766.1]
????????? 修改時間 23-MAR-2012???? 類型 FAQ???? 狀態 PUBLISHED?????????

Applies to:
Oracle Server - Enterprise Edition - Version: 11.2.0.1.0 to 11.2.0.1.0 - Release: 11.2 to 11.2
Information in this document applies to any platform.
Purpose
The purpose of this document is to have a complete list of ORA-979 bugs with workarounds and their current status on 11.2
Questions and Answers
1. BUG 9411496 - ORA-979 ON 'UNION ALL PUSHED PREDICATE' (Query Optimizer bug)
--- Symptoms ---
When the query has group by and order by, and they use the same attribute and the cursor_sharing is set to a value <> EXACT, the queries fail with ORA-979.

The call stack from the event 979 errorstack is:

... qcuErroer qcuErroep erroep qecgoc qecoby qecpqbcheck qecdrv kkqcttcalo kkqctdrvJPPD kkqjpdctr qksqbApplyToQbc kkqctdrvTD kkqjpddrv kkqdrv kkqctdrvIT apadrv opitca kksFullTypeCheck rpiswu2 kksSetBindType kksfbc ...
--- Changes ---
Following the upgrade to 11.2.
--- Cause ---
Bug 9411496 - ORA-979 ON 'UNION ALL PUSHED PREDICATE'
--- Solution ---
The workarounds are:

1. "_fix_control"="5520732:OFF"

OR

2. optimizer_features_enable = '11.1.0.7'

OR

3."_optimizer_push_pred_cost_based" = false

OR

4."_optimizer_cost_based_transformation" = off

The bug is fixed and there are patches for some platforms.? If the workarounds are not acceptable, a one-off patch for the bug should be requested from Oracle Support.

2. Bug 9478304 "LOOP FAILING WITH ORA-00979 NOT A GROUP BY EXPRESSION" (Query Optimizer bug)
--- Symptoms ---

GROUP BY/ORDER BY in PL/SQL cursor loops fails with ORA-979.

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1，3，4都是隱含參數，修改必須重啟數據庫，只有2可以在線修改，修改后編譯通過，問題解決。

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oracle 11g ora-00979 bug的處理