diff --git a/lib/arjdbc/abstract/database_statements.rb b/lib/arjdbc/abstract/database_statements.rb
index 7186f06fd..bdff3e4a4 100644
--- a/lib/arjdbc/abstract/database_statements.rb
+++ b/lib/arjdbc/abstract/database_statements.rb
@@ -104,7 +104,7 @@ def convert_legacy_binds_to_attributes(binds)
         end
       end
 
-      def raw_execute(sql, name, async: false, allow_retry: false, materialize_transactions: false)
+      def raw_execute(sql, name, async: false, allow_retry: false, materialize_transactions: true)
         log(sql, name, async: async) do
           with_raw_connection(allow_retry: allow_retry, materialize_transactions: materialize_transactions) do |conn|
             conn.execute(sql)
diff --git a/lib/arjdbc/mysql/adapter.rb b/lib/arjdbc/mysql/adapter.rb
index aee99b6ab..1bf6ce612 100644
--- a/lib/arjdbc/mysql/adapter.rb
+++ b/lib/arjdbc/mysql/adapter.rb
@@ -41,8 +41,26 @@ def jdbc_connection_class
         def new_client(conn_params, adapter_instance)
           jdbc_connection_class.new(conn_params, adapter_instance)
         end
+
+        private
+          def initialize_type_map(m)
+            super
+
+            m.register_type(%r(char)i) do |sql_type|
+              limit = extract_limit(sql_type)
+              Type.lookup(:string, adapter: :mysql2, limit: limit)
+            end
+
+            m.register_type %r(^enum)i, Type.lookup(:string, adapter: :mysql2)
+            m.register_type %r(^set)i,  Type.lookup(:string, adapter: :mysql2)
+          end
       end
 
+      # NOTE: redefines constant defined in abstract class however this time
+      # will use methods defined in the mysql abstract class and map properly
+      # mysql types.
+      TYPE_MAP = Type::TypeMap.new.tap { |m| initialize_type_map(m) }
+
       def initialize(...)
         super
 
@@ -58,11 +76,6 @@ def initialize(...)
         @connection_parameters ||= @config
       end
 
-      # NOTE: redefines constant defined in abstract class however this time
-      # will use methods defined in the mysql abstract class and map properly
-      # mysql types.
-      TYPE_MAP = Type::TypeMap.new.tap { |m| initialize_type_map(m) }
-
       def self.database_exists?(config)
         conn = ActiveRecord::Base.mysql2_connection(config)
         conn && conn.really_valid?
@@ -186,7 +199,7 @@ def _quote(value)
       #++
 
       def active?
-        !(@raw_connection.nil? || @raw_connection.closed?)  && @lock.synchronize { @raw_connection&.execute_query("/* ping */ SELECT 1") } || false
+        !(@raw_connection.nil? || @raw_connection.closed?) && @lock.synchronize { @raw_connection&.ping } || false
       end
 
       alias :reset! :reconnect!
diff --git a/lib/arjdbc/postgresql/adapter.rb b/lib/arjdbc/postgresql/adapter.rb
index 61ad5ef07..74a0c07e7 100644
--- a/lib/arjdbc/postgresql/adapter.rb
+++ b/lib/arjdbc/postgresql/adapter.rb
@@ -301,14 +301,21 @@ def release_advisory_lock(lock_id) # :nodoc:
       query_value("SELECT pg_advisory_unlock(#{lock_id})")
     end
 
-    def enable_extension(name)
-      exec_query("CREATE EXTENSION IF NOT EXISTS \"#{name}\"").tap {
-        reload_type_map
-      }
+    def enable_extension(name, **)
+      schema, name = name.to_s.split(".").values_at(-2, -1)
+      sql = +"CREATE EXTENSION IF NOT EXISTS \"#{name}\""
+      sql << " SCHEMA #{schema}" if schema
+
+      internal_exec_query(sql).tap { reload_type_map }
     end
 
-    def disable_extension(name)
-      exec_query("DROP EXTENSION IF EXISTS \"#{name}\" CASCADE").tap {
+    # Removes an extension from the database.
+    #
+    # [<tt>:force</tt>]
+    #   Set to +:cascade+ to drop dependent objects as well.
+    #   Defaults to false.
+    def disable_extension(name, force: false)
+      internal_exec_query("DROP EXTENSION IF EXISTS \"#{name}\"#{' CASCADE' if force == :cascade}").tap {
         reload_type_map
       }
     end
@@ -322,7 +329,7 @@ def extension_enabled?(name)
     end
 
     def extensions
-      exec_query("SELECT extname FROM pg_extension", "SCHEMA").cast_values
+      internal_exec_query("SELECT extname FROM pg_extension", "SCHEMA", allow_retry: true, materialize_transactions: false).cast_values
     end
 
     # Returns a list of defined enum types, and their values.
@@ -474,11 +481,16 @@ def write_query?(sql) # :nodoc:
     # end
 
     def reset!
-      clear_cache!
-      reset_transaction
-      @connection.rollback # Have to deal with rollbacks differently than the AR adapter
-      @connection.execute 'DISCARD ALL'
-      @connection.configure_connection
+      @lock.synchronize do
+        return connect! unless @raw_connection
+
+        # Have to deal with rollbacks differently than the AR adapter
+        @raw_connection.rollback
+
+        @raw_connection.execute("DISCARD ALL")
+
+        super
+      end
     end
 
     def default_sequence_name(table_name, pk = "id") #:nodoc:
diff --git a/lib/arjdbc/postgresql/oid_types.rb b/lib/arjdbc/postgresql/oid_types.rb
index a9a6143c4..c9480bd37 100644
--- a/lib/arjdbc/postgresql/oid_types.rb
+++ b/lib/arjdbc/postgresql/oid_types.rb
@@ -67,28 +67,6 @@ def assert_valid_registration(oid, oid_type)
 
     # @private
     module OIDTypes
-
-      # @override
-      def enable_extension(name)
-        result = super(name)
-        @extensions = nil
-        reload_type_map
-        result
-      end
-
-      # @override
-      def disable_extension(name)
-        result = super(name)
-        @extensions = nil
-        reload_type_map
-        result
-      end
-
-      # @override
-      def extensions
-        @extensions ||= super
-      end
-
       def get_oid_type(oid, fmod, column_name, sql_type = '') # :nodoc:
         # Note: type_map is storing a bunch of oid type prefixed with a namespace even
         # if they are not namespaced (e.g. ""."oidvector").  builtin types which are
diff --git a/lib/arjdbc/sqlite3/adapter.rb b/lib/arjdbc/sqlite3/adapter.rb
index 7ddd5459e..fdf6d56bc 100644
--- a/lib/arjdbc/sqlite3/adapter.rb
+++ b/lib/arjdbc/sqlite3/adapter.rb
@@ -706,44 +706,6 @@ def configure_connection
       # https://www.sqlite.org/pragma.html#pragma_cache_size
       raw_execute("PRAGMA cache_size = 2000", "SCHEMA")
     end
-
-    def configure_connection
-      if @config[:timeout] && @config[:retries]
-        raise ArgumentError, "Cannot specify both timeout and retries arguments"
-      elsif @config[:timeout]
-        # FIXME:
-#        @raw_connection.busy_timeout(self.class.type_cast_config_to_integer(@config[:timeout]))
-      elsif @config[:retries]
-        retries = self.class.type_cast_config_to_integer(@config[:retries])
-        raw_connection.busy_handler do |count|
-          count <= retries
-        end
-      end
-
-      # Enforce foreign key constraints
-      # https://www.sqlite.org/pragma.html#pragma_foreign_keys
-      # https://www.sqlite.org/foreignkeys.html
-      raw_execute("PRAGMA foreign_keys = ON", "SCHEMA")
-      unless @memory_database
-        # Journal mode WAL allows for greater concurrency (many readers + one writer)
-        # https://www.sqlite.org/pragma.html#pragma_journal_mode
-        raw_execute("PRAGMA journal_mode = WAL", "SCHEMA")
-        # Set more relaxed level of database durability
-        # 2 = "FULL" (sync on every write), 1 = "NORMAL" (sync every 1000 written pages) and 0 = "NONE"
-        # https://www.sqlite.org/pragma.html#pragma_synchronous
-        raw_execute("PRAGMA synchronous = NORMAL", "SCHEMA")
-        # Set the global memory map so all processes can share some data
-        # https://www.sqlite.org/pragma.html#pragma_mmap_size
-        # https://www.sqlite.org/mmap.html
-        raw_execute("PRAGMA mmap_size = #{128.megabytes}", "SCHEMA")
-      end
-      # Impose a limit on the WAL file to prevent unlimited growth
-      # https://www.sqlite.org/pragma.html#pragma_journal_size_limit
-      raw_execute("PRAGMA journal_size_limit = #{64.megabytes}", "SCHEMA")
-      # Set the local connection cache to 2000 pages
-      # https://www.sqlite.org/pragma.html#pragma_cache_size
-      raw_execute("PRAGMA cache_size = 2000", "SCHEMA")      
-    end
   end
   # DIFFERENCE: A registration here is moved down to concrete class so we are not registering part of an adapter.
 end
@@ -779,6 +741,12 @@ def initialize(...)
 
       conn_params = @config.compact
 
+      # NOTE: strict strings is not supported by the jdbc driver yet,
+      # hope it will supported soon, I open a issue in their repository.
+      #   https://github.com/xerial/sqlite-jdbc/issues/1153
+      #
+      # @config[:strict] = ConnectionAdapters::SQLite3Adapter.strict_strings_by_default unless @config.key?(:strict)
+
       @connection_parameters = conn_params
     end
 
diff --git a/src/java/arjdbc/mysql/MySQLRubyJdbcConnection.java b/src/java/arjdbc/mysql/MySQLRubyJdbcConnection.java
index cc304205f..140f722ee 100644
--- a/src/java/arjdbc/mysql/MySQLRubyJdbcConnection.java
+++ b/src/java/arjdbc/mysql/MySQLRubyJdbcConnection.java
@@ -119,6 +119,17 @@ protected DriverWrapper newDriverWrapper(final ThreadContext context, final Stri
         return driverWrapper;
     }
 
+    @JRubyMethod(name = "ping")
+    public RubyBoolean db_ping(final ThreadContext context) {
+        final Connection connection = getConnection(true);
+        if (connection == null) return context.fals;
+
+        // NOTE: It seems only `connection.isValid(aliveTimeout)` is needed
+        // for JDBC 4.0 and up. https://jira.mariadb.org/browse/CONJ-51
+
+        return context.runtime.newBoolean(isConnectionValid(context, connection));
+    }
+
     private static transient Class MYSQL_CONNECTION;
     private static transient Boolean MYSQL_CONNECTION_FOUND;