diff --git a/.examples/docker-compose/insecure/mariadb-cron-redis/apache/docker-compose.yml b/.examples/docker-compose/insecure/mariadb-cron-redis/apache/docker-compose.yml
index ab30720..3b25bc6 100644
--- a/.examples/docker-compose/insecure/mariadb-cron-redis/apache/docker-compose.yml
+++ b/.examples/docker-compose/insecure/mariadb-cron-redis/apache/docker-compose.yml
@@ -7,6 +7,7 @@ services:
     restart: always
     volumes:
       - db:/var/lib/mysql
+      - ./mysql.conf:/etc/mysql/conf.d/mysql-config.cnf
     environment:
       - MYSQL_ROOT_PASSWORD=
     env_file:
diff --git a/.examples/docker-compose/insecure/mariadb-cron-redis/apache/mysql.conf b/.examples/docker-compose/insecure/mariadb-cron-redis/apache/mysql.conf
new file mode 100644
index 0000000..15e5a42
--- /dev/null
+++ b/.examples/docker-compose/insecure/mariadb-cron-redis/apache/mysql.conf
@@ -0,0 +1,5 @@
+[mysqld]
+# Set Transaction isolation Level to READ-COMMITED (Required by nextcloud)
+# ================================================
+#   https://docs.nextcloud.com/server/12/admin_manual/configuration_database/linux_database_configuration.html#database-read-commited-transaction-isolation-level
+transaction-isolation = READ-COMMITTED
\ No newline at end of file
diff --git a/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/docker-compose.yml b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/docker-compose.yml
index 92fe787..f072a80 100644
--- a/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/docker-compose.yml
+++ b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/docker-compose.yml
@@ -7,6 +7,7 @@ services:
     restart: always
     volumes:
       - db:/var/lib/mysql
+      - ./mysql.conf:/etc/mysql/conf.d/mysql-config.cnf
     environment:
       - MYSQL_ROOT_PASSWORD=
     env_file:
diff --git a/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/mysql.conf b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/mysql.conf
new file mode 100644
index 0000000..15e5a42
--- /dev/null
+++ b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/mysql.conf
@@ -0,0 +1,5 @@
+[mysqld]
+# Set Transaction isolation Level to READ-COMMITED (Required by nextcloud)
+# ================================================
+#   https://docs.nextcloud.com/server/12/admin_manual/configuration_database/linux_database_configuration.html#database-read-commited-transaction-isolation-level
+transaction-isolation = READ-COMMITTED
\ No newline at end of file
diff --git a/.examples/docker-compose/insecure/mariadb/apache/docker-compose.yml b/.examples/docker-compose/insecure/mariadb/apache/docker-compose.yml
index 4ea6775..a048fcd 100644
--- a/.examples/docker-compose/insecure/mariadb/apache/docker-compose.yml
+++ b/.examples/docker-compose/insecure/mariadb/apache/docker-compose.yml
@@ -7,6 +7,7 @@ services:
     restart: always
     volumes:
       - db:/var/lib/mysql
+      - ./mysql.conf:/etc/mysql/conf.d/mysql-config.cnf
     environment:
       - MYSQL_ROOT_PASSWORD=
     env_file:
diff --git a/.examples/docker-compose/insecure/mariadb/apache/mysql.conf b/.examples/docker-compose/insecure/mariadb/apache/mysql.conf
new file mode 100644
index 0000000..15e5a42
--- /dev/null
+++ b/.examples/docker-compose/insecure/mariadb/apache/mysql.conf
@@ -0,0 +1,5 @@
+[mysqld]
+# Set Transaction isolation Level to READ-COMMITED (Required by nextcloud)
+# ================================================
+#   https://docs.nextcloud.com/server/12/admin_manual/configuration_database/linux_database_configuration.html#database-read-commited-transaction-isolation-level
+transaction-isolation = READ-COMMITTED
\ No newline at end of file
diff --git a/.examples/docker-compose/insecure/mariadb/fpm/docker-compose.yml b/.examples/docker-compose/insecure/mariadb/fpm/docker-compose.yml
index dc3a8aa..52095ed 100644
--- a/.examples/docker-compose/insecure/mariadb/fpm/docker-compose.yml
+++ b/.examples/docker-compose/insecure/mariadb/fpm/docker-compose.yml
@@ -7,6 +7,7 @@ services:
     restart: always
     volumes:
       - db:/var/lib/mysql
+      - ./mysql.conf:/etc/mysql/conf.d/mysql-config.cnf
     environment:
       - MYSQL_ROOT_PASSWORD=
     env_file:
diff --git a/.examples/docker-compose/insecure/mariadb/fpm/mysql.conf b/.examples/docker-compose/insecure/mariadb/fpm/mysql.conf
new file mode 100644
index 0000000..15e5a42
--- /dev/null
+++ b/.examples/docker-compose/insecure/mariadb/fpm/mysql.conf
@@ -0,0 +1,5 @@
+[mysqld]
+# Set Transaction isolation Level to READ-COMMITED (Required by nextcloud)
+# ================================================
+#   https://docs.nextcloud.com/server/12/admin_manual/configuration_database/linux_database_configuration.html#database-read-commited-transaction-isolation-level
+transaction-isolation = READ-COMMITTED
\ No newline at end of file
diff --git a/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/apache/docker-compose.yml b/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/apache/docker-compose.yml
index b4ff47a..f8213f5 100644
--- a/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/apache/docker-compose.yml
+++ b/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/apache/docker-compose.yml
@@ -7,6 +7,7 @@ services:
     restart: always
     volumes:
       - db:/var/lib/mysql
+      - ./mysql.conf:/etc/mysql/conf.d/mysql-config.cnf
     environment:
       - MYSQL_ROOT_PASSWORD=
     env_file:
diff --git a/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/apache/mysql.conf b/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/apache/mysql.conf
new file mode 100644
index 0000000..15e5a42
--- /dev/null
+++ b/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/apache/mysql.conf
@@ -0,0 +1,5 @@
+[mysqld]
+# Set Transaction isolation Level to READ-COMMITED (Required by nextcloud)
+# ================================================
+#   https://docs.nextcloud.com/server/12/admin_manual/configuration_database/linux_database_configuration.html#database-read-commited-transaction-isolation-level
+transaction-isolation = READ-COMMITTED
\ No newline at end of file
diff --git a/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/fpm/docker-compose.yml b/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/fpm/docker-compose.yml
index cfbfa91..cb654f6 100644
--- a/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/fpm/docker-compose.yml
+++ b/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/fpm/docker-compose.yml
@@ -7,6 +7,7 @@ services:
     restart: always
     volumes:
       - db:/var/lib/mysql
+      - ./mysql.conf:/etc/mysql/conf.d/mysql-config.cnf
     environment:
       - MYSQL_ROOT_PASSWORD=
     env_file:
diff --git a/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/fpm/mysql.conf b/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/fpm/mysql.conf
new file mode 100644
index 0000000..15e5a42
--- /dev/null
+++ b/.examples/docker-compose/with-nginx-proxy/mariadb-cron-redis/fpm/mysql.conf
@@ -0,0 +1,5 @@
+[mysqld]
+# Set Transaction isolation Level to READ-COMMITED (Required by nextcloud)
+# ================================================
+#   https://docs.nextcloud.com/server/12/admin_manual/configuration_database/linux_database_configuration.html#database-read-commited-transaction-isolation-level
+transaction-isolation = READ-COMMITTED
\ No newline at end of file
diff --git a/.examples/docker-compose/with-nginx-proxy/mariadb/apache/docker-compose.yml b/.examples/docker-compose/with-nginx-proxy/mariadb/apache/docker-compose.yml
index 45406dc..aeb2d6b 100644
--- a/.examples/docker-compose/with-nginx-proxy/mariadb/apache/docker-compose.yml
+++ b/.examples/docker-compose/with-nginx-proxy/mariadb/apache/docker-compose.yml
@@ -7,6 +7,7 @@ services:
     restart: always
     volumes:
       - db:/var/lib/mysql
+      - ./mysql.conf:/etc/mysql/conf.d/mysql-config.cnf
     environment:
       - MYSQL_ROOT_PASSWORD=
     env_file:
diff --git a/.examples/docker-compose/with-nginx-proxy/mariadb/apache/mysql.conf b/.examples/docker-compose/with-nginx-proxy/mariadb/apache/mysql.conf
new file mode 100644
index 0000000..15e5a42
--- /dev/null
+++ b/.examples/docker-compose/with-nginx-proxy/mariadb/apache/mysql.conf
@@ -0,0 +1,5 @@
+[mysqld]
+# Set Transaction isolation Level to READ-COMMITED (Required by nextcloud)
+# ================================================
+#   https://docs.nextcloud.com/server/12/admin_manual/configuration_database/linux_database_configuration.html#database-read-commited-transaction-isolation-level
+transaction-isolation = READ-COMMITTED
\ No newline at end of file
diff --git a/.examples/docker-compose/with-nginx-proxy/mariadb/fpm/docker-compose.yml b/.examples/docker-compose/with-nginx-proxy/mariadb/fpm/docker-compose.yml
index 7417a66..7d2b791 100644
--- a/.examples/docker-compose/with-nginx-proxy/mariadb/fpm/docker-compose.yml
+++ b/.examples/docker-compose/with-nginx-proxy/mariadb/fpm/docker-compose.yml
@@ -7,6 +7,7 @@ services:
     restart: always
     volumes:
       - db:/var/lib/mysql
+      - ./mysql.conf:/etc/mysql/conf.d/mysql-config.cnf
     environment:
       - MYSQL_ROOT_PASSWORD=
     env_file:
diff --git a/.examples/docker-compose/with-nginx-proxy/mariadb/fpm/mysql.conf b/.examples/docker-compose/with-nginx-proxy/mariadb/fpm/mysql.conf
new file mode 100644
index 0000000..15e5a42
--- /dev/null
+++ b/.examples/docker-compose/with-nginx-proxy/mariadb/fpm/mysql.conf
@@ -0,0 +1,5 @@
+[mysqld]
+# Set Transaction isolation Level to READ-COMMITED (Required by nextcloud)
+# ================================================
+#   https://docs.nextcloud.com/server/12/admin_manual/configuration_database/linux_database_configuration.html#database-read-commited-transaction-isolation-level
+transaction-isolation = READ-COMMITTED
\ No newline at end of file