[AMORO-1899] improve init schema in mysql (#1938)

* [AMORO-1899] improve init schema in mysql

* [AMORO-1899] improve doc

ams/server/src/main/java/com/netease/arctic/server/persistence/SqlSessionFactoryProvider.java

@@ -125,15 +125,16 @@ private void createTablesIfNeed(Configurations config) {
         query = "SELECT 1 FROM SYS.SYSTABLES WHERE TABLENAME = 'CATALOG_METADATA'";
       } else if (ArcticManagementConf.DB_TYPE_MYSQL.equals(dbTypeConfig)) {
         query = String.format(
-            "SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = '%s' AND table_name = '%s'",
+            "SELECT 1 FROM information_schema.tables WHERE table_schema = '%s' AND table_name = '%s'",
             connection.getCatalog(), "CATALOG_METADATA");
       }
-      ResultSet rs = statement.executeQuery(query);
-      if (!rs.next()) {
-        ScriptRunner runner = new ScriptRunner(connection);
-        runner.runScript(new InputStreamReader(Files.newInputStream(
-            Paths.get(getInitSqlScriptPath(dbTypeConfig))),
-            StandardCharsets.UTF_8));
+      try (ResultSet rs = statement.executeQuery(query);) {
+        if (!rs.next()) {
+          ScriptRunner runner = new ScriptRunner(connection);
+          runner.runScript(new InputStreamReader(Files.newInputStream(
+              Paths.get(getInitSqlScriptPath(dbTypeConfig))),
+              StandardCharsets.UTF_8));
+        }
       }
     } catch (Exception e) {
       throw new IllegalStateException("Create tables failed", e);

docs/admin-guides/deployment.md

@@ -110,33 +110,11 @@ make sure the port is not used before configuring it
 
 ### Configure system database
 
-Users can use MySQL as the system database instead of Derby. To do so, the system database must first be initialized in MySQL：
+Users can use MySQL as the system database instead of Derby. 
 
-```shell
-$ mysql -h{mysql-host-IP} -P{mysql-port} -u{username} -p
-Enter password: 
-'Welcome to the MySQL monitor.  Commands end with ; or \g.
-Your MySQL connection id is 41592724
-Server version: 5.7.20-v3-log Source distribution
-
-Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
-
-Oracle is a registered trademark of Oracle Corporation and/or its
-affiliates. Other names may be trademarks of their respective
-owners.
-
-Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
-
-mysql>
-mysql> create database amoro;
-Query OK, 1 row affected (0.01 sec)
-
-mysql> use amoro;
-Database changed
-mysql> source {ARCTIC_HOME}/conf/mysql/ams-mysql-init.sql
-```
+Create an empty database in MySQL, then AMS will automatically create table structures in this MySQL database when it first started.
 
-Add MySQL configuration under `ams`:
+One thing you need to do is Adding MySQL configuration under `config.yaml` of Ams:
 
 ```yaml
 ams: