【发布时间】：2011-06-17 10:52:35
【问题描述】：
2011 年 1 月 31 日更新
我认为我正在违反数据库限制。 GROUP BY 表达式
并且所有不显着的聚合函数可能都超过了一个
数据库块。
见http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/limits003.htm
原帖：
这是在 Oracle 数据库 10g 企业版版本 10.2.0.1.0 - 产品上。
以下插入不返回真正的 MAX() 值
如果我有两条 matchKey 相同的记录，则一条
具有贡献P NULL 值和另一个具有非NULL 值。
有时，MAX() 返回的值是 NULL 值。
INSERT /*+ APPEND */ INTO meCostingXPrePre(
matchKey ,
contributionP ,
stimulusContributionP ,
contributionC ,
ageMultiplier ,
rateTableIdP ,
rateTableIdC ,
accountNbrP ,
accountNbrC ,
commissionExpenseAccount ,
commissionReceivableAccount ,
commissionType ,
commission ,
pmPm ,
fee ,
planAgeGroupIdP ,
planAgeGroupIdC ,
rafP ,
rafC ,
nbrEmployeesRafP ,
nbrEmployeesRafC ,
contractId ,
basePlanId ,
groupOrPolicyNumber ,
planCoverageDescription ,
cobraGopn ,
cobraPcd ,
cobraCid ,
benefitId ,
insuranceStart ,
insuranceEnd ,
categoryId )
SELECT
matchKey as matchKey ,
MAX(NVL(contributionP ,0 )) as contributionP ,
MAX(NVL(stimulusContributionP ,0 )) as stimulusContributionP ,
MAX(NVL(contributionC ,0 )) as contributionC ,
MAX(NVL(ageMultiplier ,0 )) as ageMultiplier ,
MAX(NVL(rateTableIdP ,0 )) as rateTableIdP ,
MAX(NVL(rateTableIdC ,0 )) as rateTableIdC ,
MAX(NVL(accountNbrP ,0 )) as accountNbrP ,
MAX(NVL(accountNbrC ,0 )) as accountNbrC ,
MAX(NVL(commissionExpenseAccount ,0 )) as commissionExpenseAccount ,
MAX(NVL(commissionReceivableAccount ,0 )) as commissionReceivableAccount ,
MAX(NVL(commissionType ,0 )) as commissionType ,
MAX(NVL(commission ,0 )) as commission ,
MAX(NVL(pmPm ,0 )) as pmPm ,
MAX(NVL(fee ,0 )) as fee ,
MAX(NVL(planAgeGroupIdP ,0 )) as planAgeGroupIdP ,
MAX(NVL(planAgeGroupIdC ,0 )) as planAgeGroupIdC ,
MAX(NVL(rafP ,0 )) as rafP ,
MAX(NVL(rafC ,0 )) as rafC ,
MAX(NVL(nbrEmployeesRafP ,0 )) as nbrEmployeesRafP ,
MAX(NVL(nbrEmployeesRafC ,0 )) as nbrEmployeesRafC ,
CASE WHEN MAX(contractId) IS NOT NULL AND
MIN(contractId) IS NOT NULL AND
MAX(contractId) != MIN(contractId) THEN
CASE WHEN MAX(contractId) = 'No Contract No' THEN
MIN(contractId)
WHEN MIN(contractId) = 'No Contract No' THEN
MAX(contractId)
ELSE
MAX(contractId)
END
ELSE
MAX(contractId)
END as contractId ,
MAX(NVL(basePlanId ,0 )) as basePlanId ,
CASE WHEN MAX(groupOrPolicyNumber) IS NOT NULL AND
MIN(groupOrPolicyNumber) IS NOT NULL AND
MAX(groupOrPolicyNumber) != MIN(groupOrPolicyNumber) THEN
CASE WHEN MAX(groupOrPolicyNumber) = 'No Contract No' THEN
MIN(groupOrPolicyNumber)
WHEN MIN(groupOrPolicyNumber) = 'No Contract No' THEN
MAX(groupOrPolicyNumber)
ELSE
MAX(groupOrPolicyNumber)
END
ELSE
MAX(groupOrPolicyNumber)
END as groupOrPolicyNumber ,
CASE WHEN MAX(planCoverageDescription) IS NOT NULL AND
MIN(planCoverageDescription) IS NOT NULL AND
MAX(planCoverageDescription) != MIN(planCoverageDescription) THEN
CASE WHEN MAX(planCoverageDescription) = 'No Contract No' THEN
MIN(planCoverageDescription)
WHEN MIN(planCoverageDescription) = 'No Contract No' THEN
MAX(planCoverageDescription)
ELSE
MAX(planCoverageDescription)
END
ELSE
MAX(planCoverageDescription)
END as planCoverageDescription ,
CASE WHEN MAX(cobraGopn) IS NOT NULL AND
MIN(cobraGopn) IS NOT NULL AND
MAX(cobraGopn) != MIN(cobraGopn) THEN
CASE WHEN MAX(cobraGopn) = 'No Contract No' THEN
MIN(cobraGopn)
WHEN MIN(cobraGopn) = 'No Contract No' THEN
MAX(cobraGopn)
ELSE
MAX(cobraGopn)
END
ELSE
MAX(cobraGopn)
END as cobraGopn ,
CASE WHEN MAX(cobraPcd) IS NOT NULL AND
MIN(cobraPcd) IS NOT NULL AND
MAX(cobraPcd) != MIN(cobraPcd) THEN
CASE WHEN MAX(cobraPcd) = 'No Contract No' THEN
MIN(cobraPcd)
WHEN MIN(cobraPcd) = 'No Contract No' THEN
MAX(cobraPcd)
ELSE
MAX(cobraPcd)
END
ELSE
MAX(cobraPcd)
END as cobraPcd ,
CASE WHEN MAX(cobraCid) IS NOT NULL AND
MIN(cobraCid) IS NOT NULL AND
MAX(cobraCid) != MIN(cobraCid) THEN
CASE WHEN MAX(cobraCid) = 'No Contract No' THEN
MIN(cobraCid)
WHEN MIN(cobraCid) = 'No Contract No' THEN
MAX(cobraCid)
ELSE
MAX(cobraCid)
END
ELSE
MAX(cobraCid)
END as cobraCid ,
MAX(benefitId ) as benefitId ,
NULL as insuranceStart ,
NULL as insuranceEnd ,
NULL as categoryId
FROM meCostingXPrePrePre
GROUP BY matchKey;
如果我按如下方式构建索引并给出 CBO 提示
CREATE INDEX C$MECOSTINGXPREPREPRE$MULTI0 ON MECOSTINGXPREPREPRE
(MATCHKEY, CONTRIBUTIONP, STIMULUSCONTRIBUTIONP, CONTRIBUTIONC, AGEMULTIPLIER,
RATETABLEIDP, RATETABLEIDC, ACCOUNTNBRP, ACCOUNTNBRC, COMMISSIONEXPENSEACCOUNT,
COMMISSIONRECEIVABLEACCOUNT, COMMISSIONTYPE, COMMISSION, PMPM, FEE,
PLANAGEGROUPIDP, PLANAGEGROUPIDC, RAFP, RAFC,
NBREMPLOYEESRAFP, NBREMPLOYEESRAFC, CONTRACTID, BASEPLANID, GROUPORPOLICYNUMBER,
PLANCOVERAGEDESCRIPTION, COBRAGOPN, COBRAPCD, COBRACID, BENEFITID)
NOLOGGING
TABLESPACE INDX
NOPARALLEL;
INSERT /*+ APPEND */ INTO meCostingXPrePre(
...)
SELECT /*+ INDEX(meCostingXPrePrePre c$mecostingxpreprepre$multi0) */
...
FROM meCostingXPrePrePre
GROUP BY matchKey;
这使 MAX() 行为正确。
我需要添加 15 个额外的列并更改索引
小问题
CREATE INDEX C$MECOSTINGXPREPREPRE$MULTI0 ON MECOSTINGXPREPREPRE
(MATCHKEY, CONTRIBUTIONP, STIMULUSCONTRIBUTIONP, CONTRIBUTIONC, AGEMULTIPLIER,
RATETABLEIDP, RATETABLEIDC, ACCOUNTNBRP, ACCOUNTNBRC, COMMISSIONEXPENSEACCOUNT,
COMMISSIONRECEIVABLEACCOUNT, COMMISSIONTYPE, COMMISSION, PMPM, FEE,
PLANAGEGROUPIDP, PLANAGEGROUPIDC, ADDRESSONEP, ADDRESSONEC, ADDRESSTWOP,
ADDRESSTWOC, CITYP, CITYC, STATEP, STATEC, ZIPFULLP, ZIPFULLC, RAFP, RAFC,
NBREMPLOYEESRAFP, NBREMPLOYEESRAFC, CONTRACTID, BASEPLANID, GROUPORPOLICYNUMBER,
PLANCOVERAGEDESCRIPTION, COBRAGOPN, COBRAPCD, COBRACID, BENEFITID)
NOLOGGING
TABLESPACE INDX
NOPARALLEL;
给予
ORA-01793: 最大索引列数为 32
第一个 MAX() 不适用于大型列集，第二个是索引+CBO 补丁
导致索引限制。
有什么建议吗？
【问题讨论】：
-
“我需要添加 15 个额外的列”——这些词几乎不应该......不......永远不要说。如果您向已在使用的表中添加 15 列，则您的设计存在问题。如果你有 15 列，你应该考虑看看你可以规范化的地方。
-
MAX(NVL(cobraPcd,'')) 应该做什么？在 Oracle 中，'' 与 NULL 相同，因此 NVL(cobraPcd,'') 与 cobraPcd 相同。无论如何，MAX 处理 NULL 值。
-
Metalink 是否列出了这个错误？你能想出一个简单（意思是没有那么多列）的测试用例来重现它吗？
-
所有 MAX(NVL(_,'')) 类型的行都是我尝试认为 Oracle MAX() 错误将得到解决的东西。出于所有意图和目的，'' == NULL。我现在已经进行了更改，NVL(,'') 不应该包含在上面。
-
存储过程上下文中的规范化导致连接完全失控。我同意源表和目标表的规范化，但是，规范化并不总是适用于每个上下文的完美解决方案。
标签： sql oracle oracle10g indexing cbo