数据库架构演变与设计ClientClientClientabcClientClientClientabcClientClientClientAabA_aA_b;:Java(JDBC)DBMS;:xsqldbshellmysqlpoolmyclientQUERY————————2005~2008ReplicationMaster/SlaveClientWRClientMasterSlaveSlave~2010ScaleoutScaleupbinfindposmonkeyauzkDBDB2010~:CAP数据库挑战