[GitHub] [shardingsphere] git-chenhao commented on issue #24744: When the application is first started, a small number of requests for RT are very high, and the basic time consuming is in the parse phase

["git-chenhao (via GitHub)" <gi...@apache.org>]

git-chenhao commented on issue #24744:
URL: https://github.com/apache/shardingsphere/issues/24744#issuecomment-1480536862

   test code, local env need 2s+
   
   ```
    String sql ="/* mysql-connector-java-5.1.48 ( Revision: 29734982609c32d3ab7e5cac2e6acee69ff6b4aa ) */SELECT @@session.auto_increment_increment AS auto_increment_increment, @@character_set_client AS character_set_client, @@character_set_connection AS character_set_connection, @@character_set_results AS character_set_results, @@character_set_server AS character_set_server, @@collation_server AS collation_server, @@collation_connection AS collation_connection, @@init_connect AS init_connect, @@interactive_timeout AS interactive_timeout, @@license AS license, @@lower_case_table_names AS lower_case_table_names, @@max_allowed_packet AS max_allowed_packet, @@net_buffer_length AS net_buffer_length, @@net_write_timeout AS net_write_timeout, @@performance_schema AS performance_schema, @@query_cache_size AS query_cache_size, @@query_cache_type AS query_cache_type, @@sql_mode AS sql_mode, @@system_time_zone AS system_time_zone, @@time_zone AS time_zone, @@transaction_isolation AS transaction
 _isolation, @@wait_timeout AS wait_timeout";
   
           long start = System.currentTimeMillis();
           ShardingSphereSQLParserEngine parseEngine = new ShardingSphereSQLParserEngine(DatabaseTypeRegistry.getTrunkDatabaseTypeName(new MySQLDatabaseType()));
           long start2 = System.currentTimeMillis();
           System.out.println((start2 -start) + "ms");
           SQLStatement sqlStatement = parseEngine.parse(sql, true);
   
           System.out.println(sqlStatement);
           System.out.println((System.currentTimeMillis() -start) + "ms");
   ```


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