Server System Variables Type File name Default Value NULL The path name of the server SSL private key file in PEM format. For better security, use a certificate with an RSA key size of at least 2048 bits. If the key file is protected by a passphrase, the server prompts the user for the passphrase. The password must be given interactively; it cannot be stored in a file. If the passphrase is incorrect, the program continues as if it could not read the key. As of MySQL 8.0.16, this variable is dynamic and can be modified at runtime to affect the TSL context the server uses for new connections. See Server-Side Runtime Configuration and Monitoring for Encrypted Connections. Prior to MySQL 8.0.16, this variable can be set only at server startup. • stored_program_cache • stored_program_definition_cache Command-Line Format --stored-program-definition-cache=# System Variable stored_program_definition_cache Scope Global Dynamic Yes SET_VAR  Hint Applies No The stored procedure and stored function caches exists in parallel with the stored program definition cache partition of the dictionary object cache. The stored procedure and stored function caches are per connection, while the stored program definition cache is shared. The existence of objects in the stored procedure and stored function caches have no dependence on the existence of objects in the stored program definition cache, and vice versa. For more information, see Section 14.4, “Dictionary Object Cache” . Whenever a stored routine is executed this cache size is checked before the first or top-level statement in the routine is parsed; if the number of routines of the same type (stored procedures or stored functions according to which is being executed) exceeds the limit specified by this variable, the corresponding cache is flushed and memory previously allocated for cached objects is freed. This allows the cache to be flushed safely, even when there are dependencies between stored routines. Sets a soft upper limit for the number of cached stored routines per connection. The value of this variable is specified in terms of the number of stored routines held in each of the two caches maintained by the MySQL Server for, respectively, stored procedures and stored functions. Command-Line Format --stored-program-cache=# System Variable stored_program_cache Scope Global Dynamic Yes SET_VAR  Hint Applies No Type Integer Default Value 256 Minimum Value 16 Maximum Value 524288 894