Comments on: Hints for Direct-path Insert Statements

By: Christian Antognini

Christian Antognini — Thu, 17 Dec 2009 08:02:13 +0000

Hi Kerry

Sorry, I never did tests using the SYS_DL_CURSOR hint.

Cheers,
Chris

By: Kerry Osborne

Kerry Osborne — Mon, 14 Dec 2009 23:58:17 +0000

Hi Christian,

Are you familiar with SYS_DL_CURSOR hint? Do you know if the APPEND_VALUES hint is functionally the same.

Kerry

By: Houri Mohamed

Houri Mohamed — Fri, 11 Dec 2009 07:38:39 +0000

Thanks Christian,
Always we learn something new.
Today is : in 11g we can use direct path insert with insert/values using the hint
/*+ append_values */
Regards

By: Christian Antognini

Christian Antognini — Fri, 11 Dec 2009 06:33:22 +0000

Hi Mohamed DML error logging is not yet supported with direct inserts. Here is an example:

SQL> SELECT * FROM v$version WHERE rownum = 1;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production

SQL> CREATE TABLE t (n NUMBER, pad VARCHAR2(100), CONSTRAINT t_n_uk UNIQUE (n));

SQL> INSERT INTO t VALUES (1,'bla');

SQL> exec dbms_errlog.create_error_log ('t')

SQL> INSERT /*+ append_values */ INTO t VALUES (1,'bla') LOG ERRORS;
INSERT /*+ append_values */ INTO t VALUES (1,'bla') LOG ERRORS
*
ERROR at line 1:
ORA-00001: unique constraint (CHA.T_N_UK) violated

SQL> SELECT ora_err_mesg$ FROM err$_t;

no rows selected

SQL> INSERT INTO t VALUES (1,'bla') LOG ERRORS;
INSERT INTO t VALUES (1,'bla') LOG ERRORS
*
ERROR at line 1:
ORA-00001: unique constraint (CHA.T_N_UK) violated

SQL> SELECT ora_err_mesg$ FROM err$_t;

ORA_ERR_MESG$
--------------------------------------------------------------------------------
ORA-00001: unique constraint (CHA.T_N_UK) violated

Cheers, Chris

By: Houri Mohamed

Houri Mohamed — Thu, 03 Dec 2009 16:25:30 +0000

Hi Christian,

Does the dml logging error during insert /*+ append */ select is
supported by the new oracle release? Particulary for unique and
primary keys?

Mohamed

By: Christian Antognini

Christian Antognini — Tue, 10 Nov 2009 22:14:05 +0000

Hi Raja

> How about using APPEND in other DML Statements like DELETE, UPDATE, MERGE ?

The APPEND hint is only supported for INSERT and MERGE statements. With MERGE statements it is specified as follows:

MERGE /*+ append */ INTO …

> Does PARALLELISM get enabled by default, when APPEND hint is used ?

No. But a parallel insert automatically use direct-path to write data into the blocks…

Cheers,
Chris

By: Raja

Raja — Tue, 03 Nov 2009 06:16:35 +0000

The exceptions mentioned here for INSERT and APPEND are very useful.

Please clarify my doubts :
1. How about using APPEND in other DML Statements like DELETE, UPDATE, MERGE ?
2. Does PARALLELISM get enabled by default, when APPEND hint is used ?

By: Blogroll Report 16/10/2009-23/10/2009 « Coskan’s Approach to Oracle

Blogroll Report 16/10/2009-23/10/2009 « Coskan’s Approach to Oracle — Mon, 26 Oct 2009 23:55:20 +0000

[...] Christian Antognini-Hints for Direct-path Insert Statements [...]

By: Timur Akhmadeev

Timur Akhmadeev — Mon, 26 Oct 2009 08:55:27 +0000

Hi Chris, see Note 842374.1 for explanation of this behavior.

By: Alberto Dell'Era

Alberto Dell'Era — Sun, 25 Oct 2009 14:57:36 +0000

Ciao Chris,

very interesting – it seems to be useful when the arguments to the VALUES clause are actually arrays according to the docs
APPEND_VALUES Hint
In fact I can see no reason to insert-append a single row …