调整 执行 过程中显示的即时语句

Question

我想调整一个过程，该过程具有许多动态SQL语句，这些语句需要花费太多时间才能执行。我需要帮助来调整这些或一些替代解决方案。

例：

EXECUTE IMMEDIATE 'CREATE TABLE C1_LAN_GTT_1 NOLOGGING PARALLEL 4 AS 
SELECT /*+INDEX(C,CR_DECISION_M_CD1)*/ A.AGREEMENTID, 
A.AGREEMENTNO, A.LESSEEID, A.PRODUCTFLAG, A.APP_FORMNO, A.AMTFIN
FROM   LEA_AGREEMENT_DTL A, CR_DECISION_M C
WHERE  A.AGREEMENTID = C.APPID
AND    A.STATUS = ''A''
AND    TRUNC(C.AUTHDATE) BETWEEN' || '''' || P_FROM_DATE || '''' ||
' AND ' || '''' || P_TO_DATE || '''';

当我在 PLSQL 开发人员中以调试模式检查过程时，我发现这些动态语句花费了太多时间。

查询没有数据仍需要时间来执行。

Answer 1

如果没有更多细节，例如执行计划以及表、索引和数据量和分布的完整详细信息，我不知道您面临什么性能问题。但是，我可能会从这样的事情开始：

declare
p_from_date date := date '2018-01-01';
p_to_date   date := date '2018-02-01';
myddl long := 'create table c1_lan_gtt_1 nologging parallel 4 as 
select /*+index(c cr_decision_m_cd1)*/ a.agreementid, 
a.agreementno, a.lesseeid, a.productflag, a.app_formno, a.amtfin
from   lea_agreement_dtl a
join cr_decision_m c on c.appid = a.agreementid
where  a.status = ''A''
and    c.authdate between date ''' || to_char(p_from_date,'YYYY-MM-DD') || '''' ||
' and date '''     || to_char(p_to_date,'YYYY-MM-DD') || '''';
begin
dbms_output.put_line(myddl);
end;

生成

create table c1_lan_gtt_1 nologging parallel 4 as 
select /*+index(c cr_decision_m_cd1)*/ a.agreementid, 
a.agreementno, a.lesseeid, a.productflag, a.app_formno, a.amtfin
from   lea_agreement_dtl a
join cr_decision_m c on c.appid = a.agreementid
where  a.status = 'A'
and    trunc(c.authdate) between date '2018-01-01' and date '2018-02-01'

编辑：由于索引CR_DECISION_M_CD1在(APPID, TRUNC(AUTHDATE))(来自评论(，我已经恢复了trunc()功能，即使逻辑上不需要它。

Answer 2

检查P_FROM_DATE和P_TO_DATE是绑定变量 在此处输入链接说明

Answer 3

新版本的执行立即语句使用存在而不是连接：

EXECUTE IMMEDIATE 'CREATE TABLE C1_LAN_GTT_1 NOLOGGING PARALLEL 4 AS 
SELECT A.AGREEMENTID, A.AGREEMENTNO, A.LESSEEID, A.PRODUCTFLAG, A.APP_FORMNO, A.AMTFIN
FROM LEA_AGREEMENT_DTL A
WHERE A.STATUS = ''A''
AND EXISTS (
SELECT /*+INDEX(C CR_DECISION_M_CD1)*/ NULL 
FROM CR_DECISION_M C
WHERE C.APPID = A.AGREEMENTID
AND TRUNC(C.AUTHDATE) BETWEEN '''||P_FROM_DATE||''' AND '''||P_TO_DATE||'''
)';