In MySQL, a heap table, also known as a MEMORY table, is a type of table that is stored entirely in memory, as opposed to being stored on disk like regular tables, making them faster for reading/writing actions.
Volatility - data in heap tables is lost when the MySQL server restarts or when the table is dropped
Indexing options are limited compared to disk-based tables
Locking - heap tables use table-level locking, which can impact concurrent access when multiple clients are trying to access the table simultaneously
Size Limitations - Heap tables are limited by the available memory of your hosting plan. If your data exceeds the available memory, it might lead to performance issues or cause the server to run out of memory