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<p>Langflow provides flexible memory management options for storage and retrieval.</p>
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<p>This page details the following memory configuration options in Langflow.</p>
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<ul>
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<li><a href="#local-langflow-database-tables">Use local Langflow database tables</a></li>
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<li><a href="#store-messages-in-local-memory">Store messages in local memory</a></li>
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<li><a href="#configure-external-memory">Configure external memory</a></li>
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<li><a href="#configure-the-external-database-connection">Configure the external database connection</a></li>
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<li><a href="#configure-cache-memory">Configure cache memory</a></li>
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</ul>
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<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="local-langflow-database-tables">Local Langflow database tables<a href="#local-langflow-database-tables" class="hash-link" aria-label="Direct link to Local Langflow database tables" title="Direct link to Local Langflow database tables"></a></h2>
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<p>The default storage option in Langflow is a <a href="https://www.sqlite.org/" target="_blank" rel="noopener noreferrer">SQLite</a> database located at <code>langflow/src/backend/base/langflow/langflow.db</code>. The following tables are stored in <code>langflow.db</code>:</p>
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<p>• <strong>User</strong> - Stores user account information including credentials, permissions, and profiles. For more information, see <a href="/configuration-authentication">Authentication</a>.</p>
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<p>• <strong>Flow</strong> - Contains flow configurations. For more information, see <a href="/concepts-flows">Flows</a>.</p>
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<p>• <strong>Message</strong> - Stores chat messages and interactions that occur between components. For more information, see <a href="/concepts-objects#message-object">Message objects</a>.</p>
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<p>• <strong>Transaction</strong> - Records execution history and results of flow runs. This information is used for <a href="/logging">logging</a>.</p>
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<p>• <strong>ApiKey</strong> - Manages API authentication keys for users. For more information, see <a href="/configuration-api-keys">API keys</a>.</p>
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<p>• <strong>Folder</strong> - Provides a structure for flow storage. For more information, see <a href="/concepts-overview#projects-and-folders">Projects and folders</a>.</p>
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<p>• <strong>Variables</strong> - Stores global encrypted values and credentials. For more information, see <a href="/configuration-global-variables">Global variables</a>.</p>
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<p>• <strong>VertexBuild</strong> - Tracks the build status of individual nodes within flows. For more information, see <a href="/concepts-playground">Run a flow in the playground</a>.</p>
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<p>For more information, see the database models in the <a href="https://github.com/langflow-ai/langflow/tree/main/src/backend/base/langflow/services/database/models" target="_blank" rel="noopener noreferrer">source code</a>.</p>
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<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="store-messages-in-local-memory">Store messages in local memory<a href="#store-messages-in-local-memory" class="hash-link" aria-label="Direct link to Store messages in local memory" title="Direct link to Store messages in local memory"></a></h2>
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<p>To store messages in local Langflow memory, add a <a href="/components-helpers#message-store">Message store</a> component to your flow.</p>
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<p>To retrieve messages from local Langflow memory, add a <a href="/components-helpers#message-history">Message history</a> component to your flow.</p>
|
||
<p>For an example of using local chat memory, see the <a href="/memory-chatbot">Memory chatbot</a> starter flow.</p>
|
||
<p>To store or retrieve chat messages from external memory, connect the <strong>External memory</strong> port of the <strong>Message store</strong> or <strong>Message history</strong> component to a <strong>Memory</strong> component, like the <a href="/components-memories#astradbchatmemory-component">Astra DB chat memory</a> component. An example flow looks like this:</p>
|
||
<p><img decoding="async" loading="lazy" alt="Sample Flow storing Chat Memory in AstraDB" src="/assets/images/astra_db_chat_memory_rounded-9746ca2bb69d3b07ac0a071f4b9471b3.png" width="3178" height="1228" class="img_ev3q"></p>
|
||
<p>If external storage is connected to a memory helper component, no chat messages are stored in local Langflow memory.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="configure-external-memory">Configure external memory<a href="#configure-external-memory" class="hash-link" aria-label="Direct link to Configure external memory" title="Direct link to Configure external memory"></a></h2>
|
||
<p>To replace the default Langflow SQLite database with another database, modify the <code>LANGFLOW_DATABASE_URL</code> and start Langflow with this value.</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_DATABASE_URL=postgresql://user:password@localhost:5432/langflow</span></div></div><br></code></div></div>
|
||
<p>For an example, see <a href="/configuration-custom-database">Configure an external PostgreSQL database</a>.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="configure-the-external-database-connection">Configure the external database connection<a href="#configure-the-external-database-connection" class="hash-link" aria-label="Direct link to Configure the external database connection" title="Direct link to Configure the external database connection"></a></h2>
|
||
<p>The following settings allow you to fine-tune your database connection pool and timeout settings:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_DB_CONNECTION_SETTINGS='{"pool_size": 20, "max_overflow": 30, "pool_timeout": 30, "pool_pre_ping": true, "pool_recycle": 1800, "echo": false}'</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_DB_CONNECT_TIMEOUT=20</span></div></div><br></code></div></div>
|
||
<ul>
|
||
<li><code>pool_size</code>: Maximum number of database connections to keep in the pool (default: 20)</li>
|
||
<li><code>max_overflow</code>: Maximum number of connections that can be created beyond the pool_size (default: 30)</li>
|
||
<li><code>pool_timeout</code>: Number of seconds to wait before timing out on getting a connection from the pool (default: 30)</li>
|
||
<li><code>pool_pre_ping</code>: If true, the pool tests connections for liveness upon each checkout (default: true)</li>
|
||
<li><code>pool_recycle</code>: Number of seconds after which a connection is automatically recycled (default: 1800, or 30 minutes)</li>
|
||
<li><code>echo</code>: If true, SQL queries are logged for debugging purposes (default: false)</li>
|
||
<li><code>LANGFLOW_DB_CONNECT_TIMEOUT</code>: Maximum number of seconds to wait when establishing a new database connection (default: 20)</li>
|
||
</ul>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="configure-cache-memory">Configure cache memory<a href="#configure-cache-memory" class="hash-link" aria-label="Direct link to Configure cache memory" title="Direct link to Configure cache memory"></a></h2>
|
||
<p>Langflow provides multiple caching options that can be configured using the <code>LANGFLOW_CACHE_TYPE</code> environment variable.</p>
|
||
<table><thead><tr><th>Type</th><th>Description</th><th>Storage Location</th><th>Persistence</th></tr></thead><tbody><tr><td><code>async</code> (default)</td><td>Asynchronous in-memory cache</td><td>Application memory</td><td>Cleared on restart</td></tr><tr><td><code>memory</code></td><td>Thread-safe in-memory cache</td><td>Application memory</td><td>Cleared on restart</td></tr><tr><td><code>disk</code></td><td>File system-based cache</td><td>System cache directory*</td><td>Persists after restart</td></tr><tr><td><code>redis</code></td><td>Distributed cache</td><td>Redis server</td><td>Persists in Redis</td></tr></tbody></table>
|
||
<p>*System cache directory locations:</p>
|
||
<ul>
|
||
<li>Linux/WSL: <code>~/.cache/langflow/</code></li>
|
||
<li>macOS: <code>/Users/<username>/Library/Caches/langflow/</code></li>
|
||
<li>Windows: <code>%LOCALAPPDATA%\langflow\langflow\Cache</code></li>
|
||
</ul></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/install-custom-dependencies"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Install custom dependencies</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/session-id"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Use session ID to manage communication between components</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#local-langflow-database-tables" class="table-of-contents__link toc-highlight">Local Langflow database tables</a></li><li><a href="#store-messages-in-local-memory" class="table-of-contents__link toc-highlight">Store messages in local memory</a></li><li><a href="#configure-external-memory" class="table-of-contents__link toc-highlight">Configure external memory</a></li><li><a href="#configure-the-external-database-connection" class="table-of-contents__link toc-highlight">Configure the external database connection</a></li><li><a href="#configure-cache-memory" class="table-of-contents__link toc-highlight">Configure cache memory</a></li></ul></div></div></div></div></main></div></div></div><div style="position:fixed;right:20px;bottom:20px;z-index:100;display:flex;align-items:center;gap:10px;cursor:pointer"><div style="background-color:#f6f6f6;border-radius:50%;width:48px;height:48px;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 4px rgba(0,0,0,0.1)"><img src="/img/langflow-icon-black-transparent.svg" style="width:40px" alt="Search"></div></div></div>
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