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‎archive/+changes/index.html‎

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‎archive/en/about-federatedx/+comments/feed/index.html‎

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<?xml version="1.0" encoding="utf-8"?>
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<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title>MariaDB Knowledge Base Comments for: About FederatedX</title><link>https://mariadb.com/kb/en/about-federatedx/+comments/feed/</link><description></description><atom:link href="https://mariadb.com/kb/en/about-federatedx/+comments/feed/" rel="self"></atom:link><language>en-us</language><lastBuildDate>Wed, 26 Feb 2025 01:03:47 +0000</lastBuildDate><item><title>Re: About FederatedX</title><link>https://mariadb.com/kb/en/about-federatedx/+comments/6318</link><description>&lt;p&gt;Thanks a lot. Just what I needed.&lt;/p&gt;
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<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title>MariaDB Knowledge Base Comments for: About FederatedX</title><link>https://mariadb.com/kb/en/about-federatedx/+comments/feed/</link><description></description><atom:link href="https://mariadb.com/kb/en/about-federatedx/+comments/feed/" rel="self"></atom:link><language>en-us</language><lastBuildDate>Thu, 27 Feb 2025 01:02:28 +0000</lastBuildDate><item><title>Re: About FederatedX</title><link>https://mariadb.com/kb/en/about-federatedx/+comments/6318</link><description>&lt;p&gt;Thanks a lot. Just what I needed.&lt;/p&gt;
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</description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bjarne Svanberg</dc:creator><guid>https://mariadb.com/kb/en/about-federatedx/+comments/6318</guid></item><item><title>Re: About FederatedX</title><link>https://mariadb.com/kb/en/about-federatedx/+comments/6317</link><description>&lt;p&gt;You can view existing servers by querying the &lt;a href="/kb/en/mysqlservers-table/"&gt;mysql.servers&lt;/a&gt; table. You can delete servers with the &lt;a href="/kb/en/drop-server/"&gt;DROP SERVER&lt;/a&gt; statement.&lt;/p&gt;
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</description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Ian Gilfillan</dc:creator><guid>https://mariadb.com/kb/en/about-federatedx/+comments/6317</guid></item><item><title>Re: About FederatedX</title><link>https://mariadb.com/kb/en/about-federatedx/+comments/6316</link><description>&lt;p&gt;I have added a server with the "create server" syntax shown in &lt;a href="/kb/en/about-federatedx/#how-do-i-create-a-federated-server"&gt;How do I create a federated server&lt;/a&gt;.&lt;/p&gt;
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&lt;p&gt;How do I &lt;strong&gt;list&lt;/strong&gt; any created servers and how do I &lt;strong&gt;delete&lt;/strong&gt; a server I have created accidentally?&lt;/p&gt;

‎archive/en/about-federatedx/index.html‎

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<dt>Modified</dt>
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<dd>
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<span class="datetime" title="2025-02-25 11:46">13 hours, 17 minutes ago</span></dd>
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<span class="datetime" title="2025-02-25 11:46">1 day, 13 hours ago</span></dd>
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name "FEDERATED" is used in create table. So in MariaDB, the engine type
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should be given as "FEDERATED" without an extra "X", not "FEDERATEDX").</p>
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<p>The equivalent of above, if done specifying all the connection parameters</p>
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<pre class="fixed"><span class="k">CONNECTION</span><span class="o">=</span><span class="ss">&quot;mysql://<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="afddc0c0dbef9e9d98819f819f819e">[email&#160;protected]</a>:3306/db1/t1&quot;</span>
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<pre class="fixed"><span class="k">CONNECTION</span><span class="o">=</span><span class="ss">&quot;mysql://<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="4c3e2323380c7d7e7b627c627c627d">[email&#160;protected]</a>:3306/db1/t1&quot;</span>
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</pre><p>You can also change the server to point to a new schema:</p>
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<pre class="fixed"><span class="k">ALTER</span> <span class="n">SERVER</span> <span class="s1">&#39;server_one&#39;</span> <span class="k">options</span><span class="p">(</span><span class="k">DATABASE</span> <span class="s1">&#39;db2&#39;</span><span class="p">);</span>
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</pre><p>All subsequent calls to any FederatedX table using the 'server_one' will now be against tables in <code class="highlight fixed" style="white-space:pre-wrap">db2</code>! Guess what? You no longer have to perform an alter table in order to point one or more FederatedX tables to a new server!</p>
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<span class="k">DEFAULT</span> <span class="n">CHARSET</span><span class="o">=</span><span class="n">latin1</span><span class="p">;</span>
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</pre><p>Then, on the server that will be connecting to the foreign host (client), you create a federated table without specifying the table structure:</p>
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<pre class="fixed"><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">federated_test_table</span> <span class="n">ENGINE</span><span class="o">=</span><span class="n">FEDERATED</span>
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<span class="k">CONNECTION</span><span class="o">=</span><span class="s1">&#39;mysql://<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="bbc9d4d4cffb8a898c958b958b958a">[email&#160;protected]</a>:9306/federated/test_table&#39;</span><span class="p">;</span>
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<span class="k">CONNECTION</span><span class="o">=</span><span class="s1">&#39;mysql://<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="51233e3e25116063667f617f617f60">[email&#160;protected]</a>:9306/federated/test_table&#39;</span><span class="p">;</span>
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</pre><p>Notice the "ENGINE" and "CONNECTION" fields? This is where you
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respectively set the engine type, "FEDERATED" and foreign
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host information, this being the database your 'client' database
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<span class="k">KEY</span> <span class="n">other_key</span> <span class="p">(</span><span class="n">other</span><span class="p">))</span>
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<span class="n">ENGINE</span><span class="o">=</span><span class="n">FEDERATED</span>
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<span class="k">DEFAULT</span> <span class="n">CHARSET</span><span class="o">=</span><span class="n">latin1</span>
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<span class="k">CONNECTION</span><span class="o">=</span><span class="s1">&#39;mysql://<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="a6d4c9c9d2e6979491889688968897">[email&#160;protected]</a>:9306/federated/test_table&#39;</span><span class="p">;</span>
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<span class="k">CONNECTION</span><span class="o">=</span><span class="s1">&#39;mysql://<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="15677a7a61552427223b253b253b24">[email&#160;protected]</a>:9306/federated/test_table&#39;</span><span class="p">;</span>
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</pre><p>In this case the table structure must match exactly the table on the foreign server.</p>
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<h3 class="anchored_heading" id="how-to-see-the-storage-engine-in-action">How to see the storage engine in action</h3>
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<p>When developing this handler, I compiled the FederatedX database with debugging:</p>
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<p>A federated server is a way to have a foreign data source defined-- with all connection parameters-- so that you don't have to specify explicitly the connection parameters in a string.</p>
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<p>For instance, if you wanted to connect to a table, <code class="highlight fixed" style="white-space:pre-wrap">first_db.test_table</code>, using this definition: </p>
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<pre class="fixed"><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">federated_test_table</span> <span class="n">ENGINE</span><span class="o">=</span><span class="n">FEDERATED</span>
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<span class="k">CONNECTION</span><span class="o">=</span><span class="s1">&#39;mysql://<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="7e0e1f0a193e4f474c504f4846504f504f4c4d">[email&#160;protected]</a>/first_db/test_table&#39;</span><span class="p">;</span>
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<span class="k">CONNECTION</span><span class="o">=</span><span class="s1">&#39;mysql://<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="3e4e5f4a597e0f070c100f0806100f100f0c0d">[email&#160;protected]</a>/first_db/test_table&#39;</span><span class="p">;</span>
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</pre><p>You could instead create this with a server:</p>
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<pre class="fixed"><span class="k">create</span> <span class="n">server</span> <span class="s1">&#39;server_one&#39;</span> <span class="k">foreign</span> <span class="k">data</span> <span class="n">wrapper</span> <span class="s1">&#39;mysql&#39;</span> <span class="k">options</span>
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<span class="p">(</span><span class="k">HOST</span> <span class="s1">&#39;192.168.1.123&#39;</span><span class="p">,</span>

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Comments - Authentication Plugin - PARSEC
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<a href="/kb/user/login?next=/kb/en/authentication-plugin-parsec/+comments"> Login</a>
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<a href="/kb/user/login?next=/kb/en/authentication-plugin-parsec/+comments/"> Login</a>
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‎archive/en/authentication-plugin-parsec/+source/index.html‎

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<div class="revision_info">
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<dt>Revision</dt>
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<dd><a href="/kb/en/authentication-plugin-parsec/+r/143884/">143884</a></dd>
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<dd><a href="/kb/en/authentication-plugin-parsec/+r/147984/">147984</a></dd>
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<dd>
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<span class="user" id="user-1368">
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<dt>Date</dt>
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<dd>
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<span class="datetime" title="2025-02-26 21:52">2025-02-26 21:52</span></dd>
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first two fields together are called below //ext-salt//, extended salt.
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==== Login Process, Packet Exchange
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# Server sends the welcome packet with a 32-byte random scramble
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# Client sends the user name (and nothing else) to the server
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# Server sends the ext-salt to the client
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# Server sends an [[connection/#authentication-switch-request|Authentication Switch Request]] with a 32-byte random scramble
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# Client sends an empty packet to the server to request the [[connection/#parsec-plugin|ext-salt]]
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# Server sends the [[connection/#parsec-plugin|ext-salt]] to the client
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# Client sends the random 32-byte scramble, and the concat(server scramble, client scramble) ed25519-signed by a secret key generated from the PBKDF2(password, ext-salt)
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# Server replies with &#34;ok&#34; or &#34;acces denied&#34;
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{panel}
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# Server replies with [[ok_packet|&#34;ok&#34;]] or [[https://mariadb.com/kb/en/err_packet/|&#34;access denied&#34;]]
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=== Installing
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‎archive/en/authentication-plugin-parsec/index.html‎

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<dt>Modified</dt>
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<span class="datetime" title="2024-10-15 07:29">4 months, 1 week ago</span></dd>
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<span class="datetime" title="2025-02-26 21:52">3 hours, 12 minutes ago</span></dd>
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<p>first two fields together are called below <em>ext-salt</em>, extended salt.</p>
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<h4 class="anchored_heading" id="login-process-packet-exchange">Login Process, Packet Exchange</h4>
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<ol start="1"><li>Server sends the welcome packet with a 32-byte random scramble
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</li><li>Client sends the user name (and nothing else) to the server
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</li><li>Server sends the ext-salt to the client
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<ol start="1"><li>Server sends an <a href="/kb/en/connection/#authentication-switch-request">Authentication Switch Request</a> with a 32-byte random scramble
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</li><li>Client sends an empty packet to the server to request the <a href="/kb/en/connection/#parsec-plugin">ext-salt</a>
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</li><li>Server sends the <a href="/kb/en/connection/#parsec-plugin">ext-salt</a> to the client
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</li><li>Client sends the random 32-byte scramble, and the concat(server scramble, client scramble) ed25519-signed by a secret key generated from the PBKDF2(password, ext-salt)
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</li><li>Server replies with "ok" or "acces denied"
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{panel}
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</li><li>Server replies with <a href="/kb/en/ok_packet/">"ok"</a> or <a href="https://mariadb.com/kb/en/err_packet/">"access denied"</a>
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</li></ol>
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<h3 class="anchored_heading" id="installing">Installing</h3>
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<pre class="fixed">install soname 'auth_parsec';

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‎archive/en/e1044/+source/index.html‎

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<dd><a href="/kb/en/e1044/+r/145851/">145851</a></dd>
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== Possible Causes and Solutions
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The user is trying to access a database/schema the user do not have access to.
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The user is trying to access a database/schema they do not have access to. See [[troubleshooting-connection-issues/#access-to-the-server-but-not-to-a-database|Troubleshooting Connection Issues]] for more, as well as [[grant|GRANT]] for details on setting permissions.
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See [[troubleshooting-connection-issues/#access-to-the-server-but-not-to-a-database|Troubleshooting Connection Issues]] for possible solutions.
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== See also
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== See Also
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* [[when-access_denied_error-status-variable-is-incremented|When access_denied_errors status variable is incremented]]</textarea>
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