Janus Two-Phase Commit - Revision history

Ekern at 22:22, 25 April 2022

2022-04-25T22:22:34Z

← Older revision		Revision as of 22:22, 25 April 2022
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			<p class="note"><b>Note:</b> This feature is available as of Model 204 release 7.8. It is licensed and purchased separately from Model 204.</p>
	Janus Two-Phase Commit support allows transactions running in multiple <var class="product">Model 204</var> Onlines to participate in a single global transaction using the [https://en.wikipedia.org/wiki/Two-phase_commit_protocol two-phase commit protocol].		Janus Two-Phase Commit support allows transactions running in multiple <var class="product">Model 204</var> Onlines to participate in a single global transaction using the [https://en.wikipedia.org/wiki/Two-phase_commit_protocol two-phase commit protocol].
	In addition, it enables <var class="product">Model 204</var> to participate in a global transaction with an <var class="product">Imagine</var> database server.		In addition, it enables <var class="product">Model 204</var> to participate in a global transaction with an <var class="product">Imagine</var> database server.

ELowell: /* Recovery */

2020-01-15T00:31:17Z

Recovery

← Older revision		Revision as of 00:31, 15 January 2020
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	RESTART ROLL BACK ERROR STOP ROLL FORWARD		RESTART ROLL BACK ERROR STOP ROLL FORWARD
	</p>		</p>
	If, as in this example, a certificate must be retrieved from a procedure file, it would be a really bad idea for that procedure file be a file that needs to be recovered.		If, as in this example, a certificate must be retrieved from a procedure file, it would be a really bad idea for that procedure file to be a file that needs to be recovered.

	==Classes and methods==		==Classes and methods==

Alex: /* Recovery */

2020-01-14T05:14:06Z

Recovery

← Older revision		Revision as of 05:14, 14 January 2020
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	</p>		</p>
	If, as in this example, a certificate must be retrieved from a procedure file, it would be a really bad idea for that procedure file be a file that needs to be recovered.		If, as in this example, a certificate must be retrieved from a procedure file, it would be a really bad idea for that procedure file be a file that needs to be recovered.

			==Classes and methods==
			The [[Transaction class]] contains methods:
			<table>
			<tr><th>[[NewGlobal (Transaction function)\|NewGlobal]]</th><td>to start a global transaction</td></tr>
			<tr><th>[[SetGlobal (Transaction subroutine)\|SetGlobal]]</th><td>to add a branch to a global transaction</td></tr>
			</table>

Alex: /* Configuring Janus Two-Phase Commit */

2020-01-14T05:09:41Z

Configuring Janus Two-Phase Commit

← Older revision		Revision as of 05:09, 14 January 2020
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	</li>		</li>
	</ol>		</ol>

			==Recovery==
			When running recovery (the [[RESTART command]] or the [[REGENERATE command]]) against journals that might contain global transactions, a JANUS 2PC port must be defined and a coordinator added to that port before the <var>RESTART</var> or <var>REGENERATE</var> command as in:
			<p class="code">JANUS NAMESERVER 12.34.56.78
			JANUS DEFINE TWOPC * 2PC 5 SSL 0
			JANUS ADDCOORD TWOPC IMGCOORD IMGSERV.MYDOMAIN.COM 3333
			JANUS ADDCA TWOPC PROCFILE TWOPC.CA
			JANUS START TWOPC
			RESTART ROLL BACK ERROR STOP ROLL FORWARD
			</p>
			If, as in this example, a certificate must be retrieved from a procedure file, it would be a really bad idea for that procedure file be a file that needs to be recovered.

Alex: Created page with "Janus Two-Phase Commit support allows transactions running in multiple `Model 204` Onlines to participate in a single global transaction using the [ht..."

2020-01-13T03:33:57Z

Created page with "Janus Two-Phase Commit support allows transactions running in multiple <var class="product">Model 204</var> Onlines to participate in a single global transaction using the [ht..."

New page

Janus Two-Phase Commit support allows transactions running in multiple <var class="product">Model 204</var> Onlines to participate in a single global transaction using the [https://en.wikipedia.org/wiki/Two-phase_commit_protocol two-phase commit protocol].
In addition, it enables <var class="product">Model 204</var> to participate in a global transaction with an <var class="product">Imagine</var> database server.
An <var class="product">Imagine Two-Phase Commit Coordinator</var> is required to act as the two-phase commit coordinator.
<var>[[JANUS command|JANUS]]</var> commands are used to define and start a two-phase commit port. Since there is no way to specify a 2PC port on two-phase commit related statements and functions, there is no point in specifying more than one 2PC port – if more than one is specified the first started 2PC port is always used.

==Configuring Janus Two-Phase Commit==
These are the configuaration steps:
<ol>
<li>Using a <var>JANUS DEFINE</var> command, define a Janus 2PC that will be used to communicate with the coordinator.

The following is a typical command for a two-phase commit port:
<p class="code">JANUS DEFINE TWOPC * 2PC 10
</p>
</li>
<li>Specify the host address or name and port number for the coordinator. This is done with the JANUS ADDCOORDINATOR command as in:
<p class="code">JANUS ADDCOORDINATOR TWOPC IMAGINE IMAGINEHOST.MYDOMAIN.COM 3456
</p>
If, as in this example, the coordinator host is specified as a name, a name server must be specified using the [[JANUS NAMESERVER|JANUS NAMESERVER command]].
</li>
</ol>

Janus Two-Phase Commit - Revision history

Ekern at 22:22, 25 April 2022

ELowell: /* Recovery */

Alex: /* Recovery */

Alex: /* Configuring Janus Two-Phase Commit */

Alex: Created page with "Janus Two-Phase Commit support allows transactions running in multiple Model 204 Onlines to participate in a single global transaction using the [ht..."

Alex: Created page with "Janus Two-Phase Commit support allows transactions running in multiple `Model 204` Onlines to participate in a single global transaction using the [ht..."