https://www.memcp.org/index.php?action=history&feed=atom&title=File_System 2026-04-24T16:43:30Z Revision history for this page on the wiki MediaWiki 1.39.1 https://www.memcp.org/index.php?title=File_System&diff=239&oldid=prev 2025-08-31T18:59:41Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:59, 31 August 2025</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l7">Line 7:</td> <td colspan="2" class="diff-lineno">Line 7:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [uuid]-[columnname] - the content of a column (in case the [[Persistency and Performance Guarantees|ENGINE]] is not MEMORY)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [uuid]-[columnname] - the content of a column (in case the [[Persistency and Performance Guarantees|ENGINE]] is not MEMORY)</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [uuid].log - transaction log in case the [[Persistency and Performance Guarantees|ENGINE]] is LOGGED or SAFE</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [uuid].log - transaction log in case the [[Persistency and Performance Guarantees|ENGINE]] is LOGGED or SAFE</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">You can also use a [[Cluster Monitor]] for the File System persistency backend. The only thing you have to assure is that each node of the cluster points with -data to the same shared directory.</ins></div></td></tr> <!-- diff cache key memcp_wiki-mediawiki-:diff::1.12:old-238:rev-239 --> </table>

Carli https://www.memcp.org/index.php?title=File_System&diff=238&oldid=prev 2025-08-31T18:58:36Z

<p>Created page with &quot;In the file system persistency layer, each subfolder of your data folder is a database. Each folder has the following files: * schema.json - list of all tables, columns, keys and shards; is updated every time a shard is added or removed or the schema changes * schema.json.old - fallback file for crash recovery * [uuid]-[columnname] - the content of a column (in case the <a href="/wiki/Persistency_and_Performance_Guarantees" title="Persistency and Performance Guarantees">ENGINE</a> is not MEMORY) * [uuid].log - transaction log in c...&quot;</p> <p><b>New page</b></p><div>In the file system persistency layer, each subfolder of your data folder is a database.<br /> <br /> Each folder has the following files:<br /> <br /> * schema.json - list of all tables, columns, keys and shards; is updated every time a shard is added or removed or the schema changes<br /> * schema.json.old - fallback file for crash recovery<br /> * [uuid]-[columnname] - the content of a column (in case the [[Persistency and Performance Guarantees|ENGINE]] is not MEMORY)<br /> * [uuid].log - transaction log in case the [[Persistency and Performance Guarantees|ENGINE]] is LOGGED or SAFE</div>

Carli