Hi, I hava a trouble with getting a data from informaition_schema.global_status table not using query. I wrote below code and it's possible to get data from some table in performance_schema . ** reader.cc =============================================================================================== my_thread_init(); ... MEM_ROOT mem_field; READ_RECORD read_record_info; tables.init_one_table(STRING_WITH_LEN("performance_schema"), STRING_WITH_LEN("events_statements_current"), bool result = open_and_lock_tables(ctx->thd, &tables, FALSE, MYSQL_LOCK_IGNORE_TIMEOUT); if (result) { return false; } if(table = tables.table) /* if only table exists */ { init_sql_alloc(&mem_field, 1024, 0, MYF(0)); ... while (!(error= read_record_info.read_record(&read_record_info))) { char* value = get_field(&mem_field, table->field[0]); // It's OK. .... } } ... ==================================================================================== It's possible to read data from performance_schema tables using low-level function . But I tried to read data from information_schema.global_status table as same way(just changed the name of database and table) , an error occurred in open_and_lock_tables(). Is there a way to read data from information_schema.global_status not using query? Regards, Kim kyungnam.