Wamp server MySQL - high performace ~500mb - mysql

Question

I have a problem with my WampServer 2.5. MySQL 5.6.16 consumes 500 mb RAM memory. I have no databases, fresh installation. I set table_definition_cache = 400 in my.ini, but this does not solve the problem. This is my.ini
[client]
#password = your_password
port = 3306
socket = /tmp/mysql.sock
# Here follows entries for some specific programs
# The MySQL server
[wampmysqld]
port = 3306
socket = /tmp/mysql.sock
key_buffer_size = 16M
max_allowed_packet = 1M
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
table_definition_cache = 400
performance_schema=off
basedir=c:/wamp/bin/mysql/mysql5.6.17
log-error=c:/wamp/logs/mysql.log
datadir=c:/wamp/bin/mysql/mysql5.6.17/data
lc-messages-dir=c:/wamp/bin/mysql/mysql5.6.17/share
# Change your locale here !
lc-messages=fr_FR
# Avoid warning
explicit_defaults_for_timestamp = TRUE
# Disable Federated by default
skip-federated
# Replication Master Server (default)
# binary logging is required for replication
log-bin=mysql-bin
# binary logging format - mixed recommended
binlog_format=mixed
# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id = 1
# Replication Slave (comment out master section to use this)
# New for MySQL 5.6 if no slave
skip-slave-start
# Point the following paths to different dedicated disks
#tmpdir = /tmp/
#log-update = /path-to-dedicated-directory/hostname
# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = C:\mysql\data/
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = C:\mysql\data/
#innodb_log_arch_dir = C:\mysql\data/
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 16M
#innodb_additional_mem_pool_size = 2M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[isamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[myisamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout
[mysqld]
port=3306
explicit_defaults_for_timestamp = TRUE

Answer 1

It seems like you may have already seen an answer suggesting this change and the change is a good idea, but :-
Did you install the 64bit WAMPServer?
If you did there was a tiny bug that got through testing on the 64bit version of WAMPServer.
In the 64bit version of WAMPServer the name of the MySQL service was changed to wampmysqld64 but they forgot to change the section name in the my.ini file accordingly.
So in my.ini change the section name to
# The MySQL server
[wampmysqld64]
The way MySQL works is to look at its own service name and then look in the my.ini for configuration setting under a section heading that matches its service name.
This should make MySQL pay attention to your config changes.