diff --git a/defaults/main.yml b/defaults/main.yml
index 7e6afcd..47415d4 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -48,14 +48,10 @@ mysql_max_connections: 151
 # Other settings.
 mysql_wait_timeout: 28800
 
-# Try number of CPU's * 2 for thread_concurrency.
-mysql_thread_concurrency: 2
-
 # InnoDB settings.
 # Set .._buffer_pool_size up to 80% of RAM but beware of setting too high.
 mysql_innodb_file_per_table: "1"
 mysql_innodb_buffer_pool_size: "256M"
-mysql_innodb_additional_mem_pool_size: "20M"
 # Set .._log_file_size to 25% of buffer pool size.
 mysql_innodb_log_file_size: "64M"
 mysql_innodb_log_buffer_size: "8M"
diff --git a/tasks/configure.yml b/tasks/configure.yml
index bef598a..aa5018d 100644
--- a/tasks/configure.yml
+++ b/tasks/configure.yml
@@ -42,6 +42,19 @@
     mode: 0644
   when: mysql_slow_query_log_enabled
 
+- name: Create error log file (if configured).
+  shell: "touch {{ mysql_log_error }} creates={{ mysql_log_error }}"
+  when: mysql_log == "" and mysql_log_error != ""
+
+- name: Set ownership on error log file (if configured).
+  file:
+    path: "{{ mysql_log_error }}"
+    state: file
+    owner: mysql
+    group: mysql
+    mode: 0644
+  when: mysql_slow_query_log_enabled
+
 - name: Ensure MySQL is started and enabled on boot.
   service: "name={{ mysql_daemon }} state=started enabled={{ mysql_enabled_on_startup }}"
   register: mysql_service_configuration
diff --git a/templates/my.cnf.j2 b/templates/my.cnf.j2
index 054f958..b13c3cb 100644
--- a/templates/my.cnf.j2
+++ b/templates/my.cnf.j2
@@ -78,13 +78,9 @@ max_connections = {{ mysql_max_connections }}
 # Other settings.
 wait_timeout = {{ mysql_wait_timeout }}
 
-# Try number of CPU's * 2 for thread_concurrency.
-thread_concurrency = {{ mysql_thread_concurrency }}
-
 # InnoDB settings.
 innodb_file_per_table = {{ mysql_innodb_file_per_table }}
 innodb_buffer_pool_size = {{ mysql_innodb_buffer_pool_size }}
-innodb_additional_mem_pool_size = {{ mysql_innodb_additional_mem_pool_size }}
 innodb_log_file_size = {{ mysql_innodb_log_file_size }}
 innodb_log_buffer_size = {{ mysql_innodb_log_buffer_size }}
 innodb_flush_log_at_trx_commit = {{ mysql_innodb_flush_log_at_trx_commit }}