在Oracle的11g版本中提供了统计数据自动收集的功能。在部署安装11g Oracle软件过程中，其中有一个步骤便是提示是否启用这个功能(

数据库报错

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

环境

ORACLE 11G R2

RedHat 5.3 FOR 64 BIT

解决

网上给出的结论是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.

不过我的数据库版本是11G，，应该不是这个BUG。

检查日志发现：

*** 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

检查T_SALES_ORDER_ITEM表发现该表select的时候也报错：

ORA-01476: divisor is equal to zero

查看表结构：

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发现price有等于0的值！！！问题并不难解决，发现问题才是至关重要的。

修改PREPAY_RATE列，添加decode判断函数：

PREPAY_RATE NUMBER GENERATED ALWAYS AS (DECODE("PRICE",0,0,ROUND(TO_NUMBER(TO_CHAR("PREPAYMONEY"))*100/("PRICE"*"QUANTITY"),2)))

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