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</head>
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<body>
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<div class="document" id="irsequence-standard-by-default">
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<h1 class="title">IrSequence Standard by Default</h1>
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<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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!! This file is generated by oca-gen-addon-readme !!
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!! changes will be overwritten. !!
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
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<p><a class="reference external" href="https://odoo-community.org/page/development-status"><img alt="Beta" src="https://img.shields.io/badge/maturity-Beta-yellow.png" /></a> <a class="reference external" href="http://www.gnu.org/licenses/agpl-3.0-standalone.html"><img alt="License: AGPL-3" src="https://img.shields.io/badge/licence-AGPL--3-blue.png" /></a> <a class="reference external" href="https://github.com/OCA/server-tools/tree/12.0/ir_sequence_standard_default"><img alt="OCA/server-tools" src="https://img.shields.io/badge/github-OCA%2Fserver--tools-lightgray.png?logo=github" /></a> <a class="reference external" href="https://translation.odoo-community.org/projects/server-tools-12-0/server-tools-12-0-ir_sequence_standard_default"><img alt="Translate me on Weblate" src="https://img.shields.io/badge/weblate-Translate%20me-F47D42.png" /></a> <a class="reference external" href="https://runbot.odoo-community.org/runbot/149/12.0"><img alt="Try me on Runbot" src="https://img.shields.io/badge/runbot-Try%20me-875A7B.png" /></a></p>
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<p>Set the implementation to “Standard” in all your current Sequences
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(ir.sequence) and all new sequences are created as “Standard” by default
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instead of “No Gap” implementation.</p>
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<div class="section" id="what-s-the-problem-with-no-gap-sequence-implementations">
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<h1>What’s the problem with “No Gap” Sequence Implementations</h1>
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<p>“No Gap” is the default value of sequences in Odoo. However, this kind of
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sequences cause more locks and can turn a database slow.</p>
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<p>Taking as example an invoice, if you assign an invoice number to one record,
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but it sill not finish the process, this process must end in order to another
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invoice could assign a new number and there was no gaps between the invoice
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numbers. It seems to be good at first sight. But the problem starts when there
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is a chained process.</p>
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<p>Imagine that there is one user that executes a process that produces 100
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invoices and these at the same time produces 100 journal entries that also use
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a consecutive (no gap) sequence. And also those invoices are sent to sign with
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and external institution (that could take 2 seconds in giving a response
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because of internet latency or server load), and maybe they made another
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calculations that makes them to take 5 seconds more for each invoice, and all
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this is chained to one single transaction. This means that for 8.5 minutes
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anybody else could confirm invoices, neither journal entries of the involved
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journals.</p>
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<p>Now, think there is 20 users that have to execute a similar process. The
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problem turns exponential. If another user comes to make an operation with the
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same jornal it will thrown a concurrency failure.</p>
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<p>You can mitigate it if you segment each transaction and don’t chain them. It
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means, making commit for each invoice or process. It reduces the
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probability that there is a concurrency error or a lock wait. However, it still
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not solve it completely.</p>
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</div>
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<div class="section" id="why-to-use-sequences-with-standard-implementation">
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<h1>Why to use Sequences with “Standard” Implementation</h1>
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<p>If you use the standard sequence of PosgreSQL, it doesn’t lock because at the
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moment the request is done, the next sequence number it is changed in an
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isolated transaction, and it have not to wait the other transaction to end.
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However, if the transaction produces a rollback, this sequence isn’t reverted,
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it means, it’s lost. It may be not not serious because when you cancel or
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remove records that number is lost too.</p>
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</div>
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<div class="section" id="what-this-module-does">
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<h1>What this module does</h1>
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<p>To eliminate completely that concurrency/slowness problem, this module changes
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all the sequences (ir.sequence) implementation from “No Gap” to “Standard” with
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the awareness that it will skip numbers. In the majority of database models
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and many users projects there is no problem with that jump occurs.</p>
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<p><strong>Table of contents</strong></p>
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</div>
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<div class="section" id="bug-tracker">
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<h1>Bug Tracker</h1>
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<p>Bugs are tracked on <a class="reference external" href="https://github.com/OCA/server-tools/issues">GitHub Issues</a>.
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In case of trouble, please check there if your issue has already been reported.
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If you spotted it first, help us smashing it by providing a detailed and welcomed
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<a class="reference external" href="https://github.com/OCA/server-tools/issues/new?body=module:%20ir_sequence_standard_default%0Aversion:%2012.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**">feedback</a>.</p>
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<p>Do not contact contributors directly about support or help with technical issues.</p>
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</div>
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<div class="section" id="credits">
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<h1>Credits</h1>
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<div class="section" id="authors">
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<h2>Authors</h2>
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<ul class="simple">
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<li>Vauxoo</li>
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</ul>
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</div>
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<div class="section" id="contributors">
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<h2>Contributors</h2>
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<ul class="simple">
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<li>Moises López <<a class="reference external" href="mailto:moylop260@vauxoo.com">moylop260@vauxoo.com</a>></li>
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<li>Erick Birbe <<a class="reference external" href="mailto:erick@vauxoo.com">erick@vauxoo.com</a>></li>
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</ul>
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</div>
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<div class="section" id="maintainers">
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<h2>Maintainers</h2>
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<p>This module is maintained by the OCA.</p>
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<a class="reference external image-reference" href="https://odoo-community.org"><img alt="Odoo Community Association" src="https://odoo-community.org/logo.png" /></a>
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<p>OCA, or the Odoo Community Association, is a nonprofit organization whose
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mission is to support the collaborative development of Odoo features and
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promote its widespread use.</p>
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<p>Current <a class="reference external" href="https://odoo-community.org/page/maintainer-role">maintainers</a>:</p>
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<p><a class="reference external" href="https://github.com/moylop260"><img alt="moylop260" src="https://github.com/moylop260.png?size=40px" /></a> <a class="reference external" href="https://github.com/ebirbe"><img alt="ebirbe" src="https://github.com/ebirbe.png?size=40px" /></a></p>
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<p>This module is part of the <a class="reference external" href="https://github.com/OCA/server-tools/tree/12.0/ir_sequence_standard_default">OCA/server-tools</a> project on GitHub.</p>
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<p>You are welcome to contribute. To learn how please visit <a class="reference external" href="https://odoo-community.org/page/Contribute">https://odoo-community.org/page/Contribute</a>.</p>
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</div>
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</div>
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</div>
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</body>
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