Listagg works does not in mview with fast refresh on commit?

Version Info:

Oracle Database 11 g Release 11.2.0.3.0 - 64 bit Production

PL/SQL Release 11.2.0.3.0 - Production

CORE Production 11.2.0.3.0

AMT for 64-bit Windows: Version 11.2.0.3.0 - Production

NLSRTL Version 11.2.0.3.0 - Production

I have a materialized view that is defined as fast refresh on validation and includes a call to listagg. The update goes as planned, but the value of the column that is created by using the listagg not updated unless I have make an explicit refresh. I was able to recreate the problem with a simple case, pasted below. Someone knows how to fix this?

Thank you!

-Tom

Test scenario follows...

SQL> create table codes (
  2       id number primary key,
  3       product varchar2(10) not null,
  4       code varchar2(10) not null);

Table created.

SQL> create materialized view log on codes with rowid, sequence (product, code) including new values;

Materialized view log created.

SQL> create materialized view code_agg_mv
  2        refresh fast on commit
  3        with rowid
  4        as
  5  select c.product
  6        , listagg(c.code, ',') within group (order by c.code) codes
  7        , count(*) cnt
  8    from codes c
  9   group by c.product;

Materialized view created.

SQL> truncate table mv_capabilities_table;

Table truncated.

SQL> begin
  2       dbms_mview.explain_mview('CODE_AGG_MV');
  3       commit;
  4  end;
  5  /

PL/SQL procedure successfully completed.

SQL> select capability_name, possible
  2    from mv_capabilities_table
  3   where capability_name like '%REFRESH%'
  4   order by capability_name;

CAPABILITY_NAME                P
------------------------------ -
REFRESH_COMPLETE               Y
REFRESH_FAST                   Y
REFRESH_FAST_AFTER_ANY_DML     Y
REFRESH_FAST_AFTER_INSERT      Y
REFRESH_FAST_AFTER_ONETAB_DML  Y
REFRESH_FAST_PCT               N

6 rows selected.

SQL> insert into codes (id, product, code) values (1, 'Pants', 'Large');

1 row created.

SQL> insert into codes (id, product, code) values (2, 'Pants', 'Blue');

1 row created.

SQL> insert into codes (id, product, code) values (3, 'Pants', 'Itchy');

1 row created.

SQL> commit;

Commit complete.

SQL> select *
  2    from code_agg_mv;

PRODUCT    CODES                                 CNT
---------- ------------------------------ ----------
Pants      Blue,Itchy,Large                        3

SQL> -- ^^^ This is correct ^^^

SQL> delete from codes where id = 3;

1 row deleted.

SQL> commit;

Commit complete.

SQL> select * from code_agg_mv;

PRODUCT    CODES                                 CNT
---------- ------------------------------ ----------
Pants      Blue,Itchy,Large                        2

SQL> -- ^^^ CNT is correct, but codes should not contain "Itchy" ^^^
SQL> --
SQL> -- Try an explicit fast refresh...

SQL> begin
  2       dbms_mview.refresh('CODE_AGG_MV', 'F');
  3  end;
  4  /

PL/SQL procedure successfully completed.

SQL> select * from code_agg_mv;

PRODUCT    CODES                                 CNT
---------- ------------------------------ ----------
Pants      Blue,Itchy,Large                        2

SQL> -- ^^^ Nope, same issue. ^^^
SQL> --
SQL> -- Try an explicit complete refresh...

SQL> begin
  2       dbms_mview.refresh('CODE_AGG_MV', 'C');
  3  end;
  4  /

PL/SQL procedure successfully completed.

SQL> select * from code_agg_mv;

PRODUCT    CODES                                 CNT
---------- ------------------------------ ----------
Pants      Blue,Large                              2

SQL> -- ^^^ There we go. ^^^

Message edited by Tom N to include database version information.

Hello Tom,

listagg() is not supported for fast refresh.

http://docs.Oracle.com/CD/E11882_01/server.112/e25554/basicmv.htm#i1007028

Only SUM, COUNT, AVG, STDDEV, VARIANCE, MIN and MAX are supported to fast refresh.

Kind regards

Pravin

Tags: Database

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