简述数据库系统的体系结构特点

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select * from tbl_Articles WHERE ArticleID=177145 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=177145 LIMIT 0,1
select * from tbl_Articles_sphinx where id=177145 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1108640,1071821,1062566,1103895,1049030,1100515,1101115,1109499,1101929,1063213,1113383,1061044,1072837,1103556,1079890,1067331,1092656,1044649,1105543,1106232,1064173,1079950,1095624,1085478,1068774,1048360,1056384,1105605,1091376,1062716) ORDER BY field (ArticleID,1108640,1071821,1062566,1103895,1049030,1100515,1101115,1109499,1101929,1063213,1113383,1061044,1072837,1103556,1079890,1067331,1092656,1044649,1105543,1106232,1064173,1079950,1095624,1085478,1068774,1048360,1056384,1105605,1091376,1062716)