<ul><li>When a single table has 20 million records, table splitting should be considered.</li><li>The height of the B+ tree used by the InnoDB storage engine can impact query performance.</li><li>Controlling the height of the B+ tree within 3 to 4 layers is recommended for faster queries.</li><li>Estimating data volume based on the B+ tree structure and the size of data pages can help determine the need for table splitting.</li></ul>

Why should table splitting be considered when a single table has 20 million records?

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