If MySQL databases with a MEMORY engine are stored in memory, does this mean that their contents are not persisted to disk? Or are they stored on HDD, but fully loaded into RAM on system power up?
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If MySQL databases with a MEMORY engine are stored in memory, does this mean that their contents are not persisted to disk? Or are they stored on HDD, but fully loaded into RAM on system power up?
There is one file one disk that contains database definition but data never goes on disk. Data is lost when server shut down.
http://dev.mysql.com/doc/refman/5.0/en/memory-storage-engine.html
When tables become overly larges you just get errors. However like any other memory usage it can be swapped… and then will use some disk.