數據庫報錯

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.

不過我的數據庫版本是11G，應該不是這個BUG。

檢查日志發現：

*** 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

查看表結構：

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))

......

最后 select price,quantity from T_SALES_ORDER_ITEM發現price有等于0的值！！！問題并不難解決，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)))

總結

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