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這篇文章主要介紹PHP中OCP原則的示例分析，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！1. 什么是“開放-封閉”隨著軟件系統規模的不斷增大，軟件系統的維護和修改的復雜性不斷
開閉原則（Open Closed Principle）是Java世界里最基礎的設計原則，它指導我們如何建立一個穩定的、靈活的系統。 定義： 一個軟件實體如類、模塊和函數應該對擴展開放，對修改關閉。
11、Which three are true about UNDO data? A) It is used to roll back failed transactions. B) It
13、Which two are true about AWR snapshots? A) They are stored In the SYSAUX tablespace. B) They
12、Which two types of Information can be found in the alert log? A) instance recovery details B
38、Which two are true about data dictionary and dynamic performance views (v$ views)? A) All dat
19、Which two can be backed up by using RMAN when a database Is open in ARCHIVELOG mode, so that me
57、Which two statements are true about dispatchers used by the Oracle shared server? A. Multiple
69、Which is true about unusable indexes? A. Rebuilding an unusable index always requires at least
2、Which two are true about Optimizer Statistics? A) They do not persist across Instance restarts.
