跑到墙上，尝试在插入Tablea后插入具有满足特定条件的行的Tableb
drop materialized view mv ;
drop materialized view log on tablea ;
create materialized view log on tablea
with rowid, sequence ( tino, price )
including new values;
create materialized view mv
refresh fast on commit
enable query rewrite
as
SELECT tino,sum(price)
FROM tablea PARTITION(PART_201609)
group by tino;
以上将返回ORA-12054：无法设置ON COMMIT Refresh属性。
这是一个限制吗？聚合查询中没有分区运算符？
表太大了，我希望我的视图只有特定时段/月的数据
当我删除PARTITION(PART_201609)并按如下方式运行时，我能够成功创建视图：
create materialized view mv
refresh fast on commit
enable query rewrite
as
SELECT tino,sum(price)
FROM tablea
group by tino;
- 编辑 - 包括tablea的DDL
- 创建表
create table TABLEA
(
tino NUMBER not null,
price VARCHAR2(200),
dated DATE
)
partition by range (DATED)
(
partition PART_201608 values less than (TO_DATE(' 2016-09-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')),
partition PART_201609 values less than (TO_DATE(' 2016-10-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')),
partition PART_201610 values less than (TO_DATE(' 2016-11-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')));
答案 0 :(得分：1)
您可以使用the dbms_mview.explain_mview procedure查看为什么您提出的查询无法用于快速刷新提交MV：
begin
dbms_mview.explain_mview(q'[SELECT tino,sum(price)
FROM tablea PARTITION(PART_201609)
group by tino]');
end;
/
select capability_name, possible, msgno, msgtxt from mv_capabilities_table;
CAPABILITY_NAME P MSGNO MSGTXT
------------------------------ - ---------- ------------------------------------------------------------------------------------------
PCT N
REFRESH_COMPLETE Y
REFRESH_FAST N
REWRITE Y
PCT_TABLE N 2067 no partition key or PMARKER or join dependent expression in select list
REFRESH_FAST_AFTER_INSERT N 2169 the materialized view contains partition extended table name
REFRESH_FAST_AFTER_ONETAB_DML N 2143 SUM(expr) without COUNT(expr)
REFRESH_FAST_AFTER_ONETAB_DML N 2146 see the reason why REFRESH_FAST_AFTER_INSERT is disabled
REFRESH_FAST_AFTER_ANY_DML N 2161 see the reason why REFRESH_FAST_AFTER_ONETAB_DML is disabled
REFRESH_FAST_PCT N 2157 PCT is not possible on any of the detail tables in the materialized view
REWRITE_FULL_TEXT_MATCH Y
REWRITE_PARTIAL_TEXT_MATCH Y
REWRITE_GENERAL N 2169 the materialized view contains partition extended table name
REWRITE_PCT N 2158 general rewrite is not possible or PCT is not possible on any of the detail tables
PCT_TABLE_REWRITE N 2185 no partition key or PMARKER in select list
据我所知，没有任何解决2169错误的方法：
02169,00000，＆＃34;物化视图包含分区扩展表名＆＃34;
// *原因：快速刷新物化聚合视图和/或具体化 //如果使用分区
来定义连接视图，则不支持它们 //扩展表名。
// *动作：创建快速可刷新的物化视图，而不使用
//分区扩展表名或创建物化视图为
//一个完整的刷新物化视图。
无论如何，按名称指定分区有点不寻常;您可以通过指定日期范围来实现相同的功能，Oracle无论如何都会将查询限制在相关分区。您可以从以下方式获得相同的执行计划：
explain plan for
select tino, sum(price)
from tablea partition(part_201609)
group by tino;
和
explain plan for
select tino, sum(price)
from tablea
where dated >= date '2016-09-01'
and dated < date '2016-10-01'
group by tino;
--------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
--------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 115 | 15 (7)| 00:00:01 | | |
| 1 | HASH GROUP BY | | 1 | 115 | 15 (7)| 00:00:01 | | |
| 2 | PARTITION RANGE SINGLE| | 1 | 115 | 14 (0)| 00:00:01 | 2 | 2 |
| 3 | TABLE ACCESS FULL | TABLEA | 1 | 115 | 14 (0)| 00:00:01 | 2 | 2 |
--------------------------------------------------------------------------------------------------
您会看到比我的虚拟表更高的行数，但请注意PSTART和PSTOP列。
使用它作为你的MV仍然不够：
begin
dbms_mview.explain_mview(q'[select tino, sum(price)
from tablea
where dated >= date '2016-09-01'
and dated < date '2016-10-01'
group by tino]');
end;
/
select capability_name, possible, msgno, msgtxt from mv_capabilities_table;
CAPABILITY_NAME P MSGNO MSGTXT
------------------------------ - ---------- ------------------------------------------------------------------------------------------
PCT N
REFRESH_COMPLETE Y
REFRESH_FAST N
REWRITE Y
PCT_TABLE N 2067 no partition key or PMARKER or join dependent expression in select list
REFRESH_FAST_AFTER_INSERT N 2081 mv log does not have all necessary columns
REFRESH_FAST_AFTER_ONETAB_DML N 2143 SUM(expr) without COUNT(expr)
REFRESH_FAST_AFTER_ONETAB_DML N 2146 see the reason why REFRESH_FAST_AFTER_INSERT is disabled
REFRESH_FAST_AFTER_ONETAB_DML N 2142 COUNT(*) is not present in the select list
REFRESH_FAST_AFTER_ONETAB_DML N 2143 SUM(expr) without COUNT(expr)
REFRESH_FAST_AFTER_ANY_DML N 2161 see the reason why REFRESH_FAST_AFTER_ONETAB_DML is disabled
REFRESH_FAST_PCT N 2157 PCT is not possible on any of the detail tables in the materialized view
REWRITE_FULL_TEXT_MATCH Y
REWRITE_PARTIAL_TEXT_MATCH Y
REWRITE_GENERAL Y
REWRITE_PCT N 2158 general rewrite is not possible or PCT is not possible on any of the detail tables
PCT_TABLE_REWRITE N 2185 no partition key or PMARKER in select list
您需要解决2067错误：
02067,00000，＆＃34;选择列表中没有分区键或PMARKER或连接相关表达式＆＃34;
// *原因：实现时不支持相关功能 //查看除非选择列表（如果是GROUP BY，则按列表分组） //子句存在）包括分区键或
// PMARKER函数引用有问题的表或表达式
//依赖于相关表格的分区列加入 // *操作：添加分区键或PMARKER函数引用或依赖于连接的
//表达式到选择列表（以及GROUP BY子句，如果存在）。
...与partition change tracking有关。您可以将a partition marker添加到选择列表和分组，再次获得相同的执行计划（PSTART / PSTOP），但现在允许快速刷新：
explain plan for
select dbms_mview.pmarker(rowid), tino, sum(price)
from tablea
where dated >= date '2016-09-01'
and dated < date '2016-10-01'
group by dbms_mview.pmarker(rowid), tino;
select * from table(dbms_xplan.display);
begin
dbms_mview.explain_mview(q'[select dbms_mview.pmarker(rowid), tino, sum(price)
from tablea
where dated >= date '2016-09-01'
and dated < date '2016-10-01'
group by dbms_mview.pmarker(rowid), tino]');
end;
/
CAPABILITY_NAME P MSGNO MSGTXT
------------------------------ - ---------- ------------------------------------------------------------------------------------------
PCT Y
REFRESH_COMPLETE Y
REFRESH_FAST Y
REWRITE Y
PCT_TABLE Y
REFRESH_FAST_AFTER_INSERT N 2081 mv log does not have all necessary columns
REFRESH_FAST_AFTER_ONETAB_DML N 2143 SUM(expr) without COUNT(expr)
REFRESH_FAST_AFTER_ONETAB_DML N 2146 see the reason why REFRESH_FAST_AFTER_INSERT is disabled
REFRESH_FAST_AFTER_ONETAB_DML N 2142 COUNT(*) is not present in the select list
REFRESH_FAST_AFTER_ONETAB_DML N 2143 SUM(expr) without COUNT(expr)
REFRESH_FAST_AFTER_ANY_DML N 2161 see the reason why REFRESH_FAST_AFTER_ONETAB_DML is disabled
REFRESH_FAST_PCT Y
REWRITE_FULL_TEXT_MATCH Y
REWRITE_PARTIAL_TEXT_MATCH Y
REWRITE_GENERAL Y
REWRITE_PCT Y
PCT_TABLE_REWRITE Y
您确实可以使用该查询来创建MV：
create materialized view mv
refresh fast on commit
enable query rewrite
as
select dbms_mview.pmarker(rowid), tino, sum(price)
from tablea
where dated >= date '2016-09-01'
and dated < date '2016-10-01'
group by dbms_mview.pmarker(rowid), tino;
Materialized view MV created.
如果要启用MV中的所有功能，可以将dated列添加到MV日志中：
create materialized view log on tablea
with rowid, sequence ( dated, tino, price )
including new values;
并在MV查询中包含缺少的聚合：
select dbms_mview.pmarker(rowid), tino, sum(price), count(price), count(*)
from tablea a
where dated >= date '2016-09-01'
and dated < date '2016-10-01'
group by dbms_mview.pmarker(rowid), tino
不相关，但请注意，如果它有益，您也可以对MV视图日志进行分区：
create materialized view log on tablea
partition by range (dated)
(
partition PART_201608 values less than (TO_DATE(' 2016-09-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')),
partition PART_201609 values less than (TO_DATE(' 2016-10-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')),
partition PART_201610 values less than (TO_DATE(' 2016-11-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
)
with rowid, sequence ( dated, tino, price )
including new values;