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Full Discussion: Executing SQL's in parallel
Top Forums UNIX for Beginners Questions & Answers Executing SQL's in parallel Post 303041072 by member2014 on Wednesday 13th of November 2019 07:53:47 PM
Old 11-13-2019
Executing SQL's in parallel

Hi Folks,

I have requirement to pull a bunch of SQL's from a table in DB and execute them in parallel and update the status of each query as and when they complete. Can you please help me with ideas on how this can be achieved?

Code:
 
create table list_of_sql
(
id number,
full_sql varchar2(255),
status varchar2(50),
create_dt timestamp,
update_dt timestamp
)

id - auto-generated number
full_sql - will have the sql to be executed
status - P : Pending (when the sql is added but not picked up for execution yet)
A : Active (Once the query is picked up for execution and is running)
C : Completed (Once the query execution has completed)

It will be easy to do this sequentially but the requirement is to run the sql's in parallel and at a time there will be no more than 10 sql;s in the table.

Thanks in advance.
 

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Data::Phrasebook::SQL::Query(3pm)			User Contributed Perl Documentation			 Data::Phrasebook::SQL::Query(3pm)

NAME
Data::Phrasebook::SQL::Query - Query Extension to the SQL/DBI Phrasebook Model. SYNOPSIS
my $q = $book->query( 'find_author' ); my $q = $book->query( 'find_author', 'Dictionary' ); DESCRIPTION
An extension to the SQL class to specifically handle the DBI interface for each query requested. CONSTRUCTOR
new Not to be accessed directly, but via the parent Data::Phrasebook, by specifying the class as SQL. METHODS
sql Get/set the current "sql" statement, in a form suitable for passing straight to DBI. sth Get/set the current statement handle. args Return list of arguments that will be used as bind parameters to any placeholders. Any given arguments will replace the whole list. Returns list in list context, arrayref in scalar. order As for "args", but regarding the corresponding list of argument names. The assorted "order_XXX" methods are supported as for "args_XXX". dbh Get/set the database handle. PREPARATION
/ EXECUTING METHODS execute Executes the query. Returns the result of "DBI::execute". Any arguments are given to "order_args" with the return of that method being used as arguments to "DBI::execute". If no arguments, uses those already specified. Calls "prepare" if necessary. order_args Given a hash or hashref of keyword to value mappings, organises an array of arguments suitable for use as bind parameters in the order needed by the query itself. prepare Prepares the query for execution. This method is called implicitly in most cases so you generally don't need to know about it. rebind Rebinds any bound values. Lets one pass a scalar reference in the arguments to "order_args" and have the bound value update if the original scalar changes. This method is not needed externally to this class. DELEGATED METHODS
Any method not mentioned above is given to the statement handle. All these delegations will implicitly call "prepare". SEE ALSO
Data::Phrasebook, Data::Phrasebook::SQL. SUPPORT
Please see the README file. AUTHOR
Original author: Iain Campbell Truskett (16.07.1979 - 29.12.2003) Maintainer: Barbie <barbie@cpan.org> since January 2004. for Miss Barbell Productions <http://www.missbarbell.co.uk>. COPYRIGHT AND LICENSE
Copyright (C) 2003 Iain Truskett. Copyright (C) 2004-2010 Barbie for Miss Barbell Productions. This module is free software; you can redistribute it and/or modify it under the Artistic Licence v2. perl v5.10.1 2010-08-31 Data::Phrasebook::SQL::Query(3pm)
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