Re: Woraround A: for performance problem on view joining several tables

From: Juan Carlos Reyes Pacheco <jcdrpllist_at_gmail.com>
Date: Thu, 10 Jul 2014 14:37:53 -0400
Message-ID: <CAGYrQytTc-E-qTv5GHcJ+v4CyJQidgpA2dnS9XU6JnONn3buHQ_at_mail.gmail.com>

The select * from view(union all of some tables) a where a.date_column = functiongetdate

takes less than 0,01 seconds against the 14s using column

2014-07-10 14:36 GMT-04:00 Juan Carlos Reyes Pacheco <jcdrpllist_at_gmail.com>:

> Thank you.
> If you are interested.
>
> I don't have too much time and I still couldn't get work the Partitioned
> UNION-ALL views
> meanwhile I found a work around to solved in 11.2.0.3 patch 15, meanwhile
> I try the other solution.
>
> The workaround is replacing int the where with a function instead of a
> column
> I used another table for the date, and the problem persists, so the
> problem is not the table itself but the optimizer. I gather full statitics,
> etc.
>
> select * from view(union all of some tables) a, one_row_date_table b
> where a.date_column=b.date_column
> takes 14s
>
> select * from view(union all of some tables) a
> where a.date_column = (SELECT b.date_column FROM one_row_date_table b)
> takes 14s
>
> select * from view(union all of some tables) a
> where a.date_column = functiongetdate
>
>
> functiongetdate
> is
> begin
> SELECT b.date_column FROM one_row_date_table b
> return b.date_column
> end;
>
> :)
>
> If you are interested I put both execution plans.
>
> DATE COLUMN=DATE COLUMN
>
> ------------------------------------------------------------
>
> Statement Id=15 Type=UNION-ALL
> Cost=0 TimeStamp=10-07-14::14::25:00
>
> (1) SELECT STATEMENT ALL_ROWS
> Est. Rows: 5.314.311 Cost: 30.052
> (18) SORT GROUP BY
> Est. Rows: 5.314.311 Cost: 30.052
> (17) HASH JOIN
> Est. Rows: 5.314.311 Cost: 29.282
> (9) NESTED LOOPS
> Est. Rows: 34 Cost: 33
> (7) NESTED LOOPS
> Est. Rows: 1 Cost: 2
> (5) NESTED LOOPS
> Est. Rows: 1 Cost: 2
> (3) TABLE TABLE ACCESS BY INDEX ROWID
> DAZ.UTL_MULTIEMPRESA_EMPRESA [Analyzed]
> (3) Blocks: 5 Est. Rows: 1 of 1 Cost: 1
> Tablespace: TBL_USERS
> (2) INDEX (UNIQUE) INDEX UNIQUE SCAN
> DAZ.CST_USR_SIGLA [Analyzed]
> Est. Rows: 1
> (4) INDEX (UNIQUE) INDEX RANGE SCAN
> DAZ.IDX_MEM_FECHA_HOY [Analyzed]
> Est. Rows: 1 Cost: 1
> (6) INDEX (UNIQUE) INDEX UNIQUE SCAN
> DAZ.CST_IDI_CODIGO_45 [Analyzed]
> Est. Rows: 1
> (8) TABLE TABLE ACCESS FULL SOA.CLIENTES_ME
> [Analyzed]
> (8) Blocks: 110 Est. Rows: 34 of 1.971 Cost: 31
> Tablespace: TBL_USERS
> (16) VIEW VIEW SOA.CARTERA_TOTAL_RAW
> Est. Rows: 1.848.456 Cost: 29.172
> (15) UNION-ALL
> (10) INDEX INDEX RANGE SCAN
> SOA.CARTERA_IDX$$_03C10050 [Analyzed]
> Est. Rows: 15 Cost: 4
> (14) VIEW VIEW SOA.HICARTERA
> Est. Rows: 1.848.441 Cost: 29.168
> (13) UNION-ALL
> (11) TABLE TABLE ACCESS FULL
> SOA.HICARTERA_RW [Analyzed]
> (11) Blocks: 88.881 Est. Rows: 1.729.179
> of 2.183.791 Cost: 24.025
> Tablespace: TBL_USERS
> (12) TABLE TABLE ACCESS FULL
> SOA.HICARTERA_RO [Analyzed]
> (12) Blocks: 19.105 Est. Rows: 119.262 of
> 536.364 Cost: 5.143
> Tablespace: TBL_USERS
>
>
> DATE COLUMN=FUNCTION RETURNING DATE
>
> ------------------------------------------------------------
>
> Statement Id=15 Type=INDEX
> Cost=4 TimeStamp=10-07-14::14::24:26
>
> (1) SELECT STATEMENT ALL_ROWS
> Est. Rows: 27.669 Cost: 3.278
> (22) SORT GROUP BY
> Est. Rows: 27.669 Cost: 3.278
> (21) MERGE JOIN CARTESIAN
> Est. Rows: 27.669 Cost: 3.274
> (9) NESTED LOOPS
> Est. Rows: 34 Cost: 32
> (7) NESTED LOOPS
> Est. Rows: 1 Cost: 1
> (5) NESTED LOOPS
> Est. Rows: 1 Cost: 1
> (3) TABLE TABLE ACCESS BY INDEX ROWID
> DAZ.UTL_MULTIEMPRESA_EMPRESA [Analyzed]
> (3) Blocks: 5 Est. Rows: 1 of 1 Cost: 1
> Tablespace: TBL_USERS
> (2) INDEX (UNIQUE) INDEX UNIQUE SCAN
> DAZ.CST_USR_SIGLA [Analyzed]
> Est. Rows: 1
> (4) INDEX (UNIQUE) INDEX UNIQUE SCAN
> DAZ.CST_MEM_CODIGO [Analyzed]
> Est. Rows: 1
> (6) INDEX (UNIQUE) INDEX UNIQUE SCAN
> DAZ.CST_IDI_CODIGO_45 [Analyzed]
> Est. Rows: 1
> (8) TABLE TABLE ACCESS FULL SOA.CLIENTES_ME
> [Analyzed]
> (8) Blocks: 110 Est. Rows: 34 of 1.971 Cost: 31
> Tablespace: TBL_USERS
> (20) BUFFER SORT
> Est. Rows: 802 Cost: 3.246
> (19) VIEW VIEW SOA.CARTERA_TOTAL_RAW
> Est. Rows: 802 Cost: 95
> (18) UNION-ALL
> (11) FILTER
> (10) INDEX INDEX RANGE SCAN
> SOA.CARTERA_IDX$$_03C10050 [Analyzed]
> Est. Rows: 15 Cost: 4
> (17) VIEW VIEW SOA.HICARTERA
> Est. Rows: 787 Cost: 91
> (16) UNION-ALL
> (13) TABLE TABLE ACCESS BY INDEX ROWID
> SOA.HICARTERA_RW [Analyzed]
> (13) Blocks: 88.881 Est. Rows: 427 of
> 2.183.791 Cost: 31
> Tablespace: TBL_USERS
> (12) INDEX INDEX RANGE SCAN
> SOA.IDX_HCA_LIQ_RO [Analyzed]
> Est. Rows: 544 Cost: 4
> (15) TABLE TABLE ACCESS BY INDEX ROWID
> SOA.HICARTERA_RO [Analyzed]
> (15) Blocks: 19.105 Est. Rows: 360 of
> 536.364 Cost: 60
> Tablespace: TBL_USERS
> (14) INDEX INDEX RANGE SCAN
> SOA.IDX_HCA_LIQ [Analyzed]
> Est. Rows: 618 Cost: 6
>
>

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Received on Thu Jul 10 2014 - 20:37:53 CEST