What are the characteristics of the Memory storage engine in mysql?

1. Each table of the Memory table can have up to 32 indexes.

16 columns per index, and a key length of 500 bytes.

2. The storage engine executes HASH and BTREE micronization.

3. There can be non-unique key values ​​in the table.

4. The table adopts a fixed record length format.

5. BLOB or TEXT columns are not supported.

Example

mysql> CREATE TABLE lookup
        (id INT, INDEX USING HASH (id))
       ENGINE = MEMORY;
 
mysql> CREATE TABLE lookup
        (id INT, INDEX USING BTREE (id))
       ENGINE = MEMORY;

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