禁用Oracle 11g的統計資料自動收集功能

資料庫報錯
GATHER_STATS_JOB encountered errors.  Check the trace file.
Errors in file /opt/Oracle/diag/rdbms/dbserver1/dbserver1/trace/dbserver1_j003_10544.trc:
ORA-20011: Approximate NDV failed: ORA-01476: divisor is equal to zero

環境
ORACLE 11G R2
RedHat 5.3 FOR 64 BIT

解決
網上給出的結論是BUG。
Bug No: 6040840
Filed 09-MAY-2007 Updated 10-MAY-2007
Product Oracle Server - Enterprise Edition Product Version  9.2.0.8
Platform. AIX5L Based Systems (64-bit) Platform. Version No Data
Database Version 9.2.0.8 Affects Platforms  Generic
Severity Severe Loss of Service Status Duplicate Bug. To Filer
Base Bug 5645718 Fixed in Product Version No Data

Problem statement:
DBMS_STATS.GATHER_TABLE_STATS FAILS WITH ORA-1476.
WORKAROUND: ----------- n/a . RELATED BUGS: ------------- Bug#5645718.

不過我的資料庫版本是11G，應該不是這個BUG。
檢查日誌發現：
*** 2012-09-29 06:00:16.870
GATHER_STATS_JOB: GATHER_TABLE_STATS('"MIS"','"T_SALES_ORDER_ITEM"','""', ...)
ORA-20011: Approximate NDV failed: ORA-01476: divisor is equal to zero

檢查T_SALES_ORDER_ITEM表發現該表select的時候也報錯：
ORA-01476: divisor is equal to zero

查看錶結構：
CREATE TABLE T_SALES_ORDER_ITEM
(
  ID            NUMBER(18)                    NOT NULL,
  ......
  PREPAY_RATE    NUMBER GENERATED ALWAYS AS (ROUND(TO_NUMBER(TO_CHAR("PREPAYMONEY"))*100/("PRICE"*"QUANTITY"),2))
  ......

最後 select price,quantity from T_SALES_ORDER_ITEM發現price有等於0的值！！！問題並不難解決，發現問題才是至關重要的。
修改PREPAY_RATE列，添加decode判斷函數：
 PREPAY_RATE    NUMBER GENERATED ALWAYS AS (DECODE("PRICE",0,0,ROUND(TO_NUMBER(TO_CHAR("PREPAYMONEY"))*100/("PRICE"*"QUANTITY"),2)))

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