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level101/databases_sql/innodb/index.html
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<h1>InnoDB</h1>
<h3 id="why-should-you-use-this">Why should you use this?</h3>
<p>General purpose, row level locking, ACID support, transactions, crash recovery and multi-version concurrency control etc.</p>
<p>General purpose, row level locking, ACID support, transactions, crash recovery and multi-version concurrency control, etc.</p>
<h3 id="architecture">Architecture</h3>
<p><img alt="alt_text" src="../images/innodb_architecture.png" title="InnoDB components" /></p>
<h3 id="key-components">Key components:</h3>
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<li>
<p>Memory:</p>
<ul>
<li>Buffer pool: LRU cache of frequently used data(table and index) to be processed directly from memory, which speeds up processing. Important for tuning performance.</li>
<li>Buffer pool: LRU cache of frequently used data (table and index) to be processed directly from memory, which speeds up processing. Important for tuning performance.</li>
<li>Change buffer: Caches changes to secondary index pages when those pages are not in the buffer pool and merges it when they are fetched. Merging may take a long time and impact live queries. It also takes up part of the buffer pool. Avoids the extra I/O to read secondary indexes in.</li>
<li>Adaptive hash index: Supplements InnoDB’s B-Tree indexes with fast hash lookup tables like a cache. Slight performance penalty for misses, also adds maintenance overhead of updating it. Hash collisions cause AHI rebuilding for large DBs.</li>
<li>