我编写了一个视图逻辑来根据需求提取数据。 我需要建议或解决方案来改善视图逻辑的性能。
MYTABLE：
|SID | SREF | STYPE | SQID | SNAME | CCID1 | CCID2 | CCID3 |
--------------------------------------------------------------------
|XX | SREF001 | HR | 1 | 10001 | ABC | DEF | XYZ |
|XX | SREF001 | HR | 2 | 10001 | ABC | DEF | XYZ |
|XX | SREF002 | KR | 1 | 10001 | ABC | DEF | XYZ |
|XX | SREF002 | KR | 2 | 10001 | ABC | DEF | XYZ |
|YY | SREF011 | HR | 1 | 20001 | ABC | DEF | XYZ |
|YY | SREF011 | HR | 2 | 20001 | ABC | DEF | XYZ |
|YY | SREF012 | KR | 1 | 20001 | ABC | DEF | XYZ |
|YY | SREF012 | KR | 2 | 20001 | ABC | DEF | XYZ |
MyView的：
CREATE VIEW MYTAB_VIEW AS
SELECT SID, SREF,
MAX(CASE WHEN STYPE='HR' AND SQID=1 THEN SNAME END) AS HR1_SNAME,
MAX(CASE WHEN STYPE='HR' AND SQID=1 THEN CCID1 END) AS HR1_CCID1,
MAX(CASE WHEN STYPE='HR' AND SQID=1 THEN CCID2 END) AS HR1_CCID2,
MAX(CASE WHEN STYPE='HR' AND SQID=1 THEN CCID3 END) AS HR1_CCID3,
MAX(CASE WHEN STYPE='HR' AND SQID=2 THEN SNAME END) AS HR2_SNAME,
MAX(CASE WHEN STYPE='HR' AND SQID=2 THEN CCID1 END) AS HR2_CCID1,
MAX(CASE WHEN STYPE='HR' AND SQID=2 THEN CCID2 END) AS HR2_CCID2,
MAX(CASE WHEN STYPE='HR' AND SQID=2 THEN CCID3 END) AS HR2_CCID3,
MAX(CASE WHEN STYPE='KR' AND SQID=1 THEN SNAME END) AS KR1_SNAME,
MAX(CASE WHEN STYPE='KR' AND SQID=1 THEN CCID1 END) AS KR1_CCID1,
MAX(CASE WHEN STYPE='KR' AND SQID=1 THEN CCID2 END) AS KR1_CCID2,
MAX(CASE WHEN STYPE='KR' AND SQID=1 THEN CCID3 END) AS KR1_CCID3,
MAX(CASE WHEN STYPE='KR' AND SQID=2 THEN SNAME END) AS KR2_SNAME,
MAX(CASE WHEN STYPE='KR' AND SQID=2 THEN CCID1 END) AS KR2_CCID1,
MAX(CASE WHEN STYPE='KR' AND SQID=2 THEN CCID2 END) AS KR2_CCID2,
MAX(CASE WHEN STYPE='KR' AND SQID=2 THEN CCID3 END) AS KR2_CCID3
FROM MYTABLE
GROUP BY SID, SREF;
＆＃34; MYTABLE＆＃34;会有数百万的记录。 因此，视图逻辑成为生产中最大的性能损失。 我有STYPE，SQID，SNAME，CCID1，CCID2，CCID3的索引。但它仍然很慢......
执行时间为105秒，现在!!
请建议我如何改善表现......
更新：请不要建议MaterializedView。
谢谢！