Обсуждение: INSERT ALL with DML ERROR Logging replacement in PostgreSQL

Hi Team,

We are working on a project where we are moving from Oracle to PostgreSQL and working on a migration tool which mostly have statements for inserting the records which are correct and logging the errors in error table using ORACLE inbuilt statement for INSERT ALL with DML ERROR logging. 

As part of the postgresql best practices, what approach are we taking to move these types of statements in Postgresql as we don't have any such equivalent mechanism to load correct data in the main table and error record in error table with error reason. 

The statements mostly used are -->

INSERT ALL INTO

target_table

(COLUMN LIST)

VALUES()

LOG ERROR INTO ...

SELECT statement considering the source tables;

)

Can anyone please help me with what could be the best approach to convert this in the tool.

--

Best Regards,

Jagmohan 

Hi,

Maybe what you are looking for is here https://github.com/MigOpsRepos/pg_dbms_errlog , this is a PostgreSQL extension that emulates the DBMS_ERRLOG Oracle package.

Best regards,

-- 
Gilles Darold
http://www.darold.net/

Hi Gilles,

I was going though this earlier today but didn't compiled it as I read it may not be able to capture the errors if we have below type of statement and most of our statements are of INSERT .. SELECT statements only.

The form INSERT INTO <tablename> SELECT ... will not have the same behavior than in Oracle. It will not stored the successful insert and logged the rows in error. This is not supported because it is a single transaction for PostgreSQL and everything is rolled back in case of error.

Our all statements are of that form will it be still useful.

Right, this was not obvious in your post, but yes if you are using INSERT + SELECT this is not possible with the current version of this extension. Maybe that could be possible by rewriting internally the query to loop over the result of the select and generate an insert per row returned, but with performances lost of courses.

Best regards,

-- 
Gilles Darold
http://www.darold.net/