首頁 > 資料庫 > mysql教程 > Oracle PL/SQL之Flashback Table与外键约束

Oracle PL/SQL之Flashback Table与外键约束

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
發布: 2016-06-07 17:04:37
原創
1342 人瀏覽過

Oracle PL/SQL之Flashback Table与外键约束

我们知道 Flashback Table可以把drop掉的表从回收站里恢复回来,但是并不是关于该表的所有东西都能被Flashback回来,,比如外键约束。

除此之外,带有细粒度审计(Fine-Grained Auditing )和虚拟专用数据库策略(Virtual Private Database policies)的表也不可恢复的哦,请看Oracle官方的Flashback说明:

  • A table and all of its dependent objects (indexes, LOB segments, nested tables, triggers, constraints and so on) go into the recycle bin together, when you drop the table. Likewise, when you perform Flashback Drop, the objects are generally all retrieved together.

    It is possible, however, that some dependent objects such as indexes may have been reclaimed due to space pressure. In such cases, the reclaimed dependent objects are not retrieved from the recycle bin.

  • Due to security concerns, tables which have Fine-Grained Auditing (FGA) and Virtual Private Database (VPD) policies defined over them are not protected by the recycle bin.

  • Partitioned index-organized tables are not protected by the recycle bin.

  • The recycle bin does not preserve referential constraints on a table (though other constraints will be preserved if possible). If a table had referential constraints before it was dropped (that is, placed in the recycle bin), then re-create any referential constraints after you retrieve the table from the recycle bin with Flashback Drop.

    REF:

  • linux

    本網站聲明
    本文內容由網友自願投稿,版權歸原作者所有。本站不承擔相應的法律責任。如發現涉嫌抄襲或侵權的內容,請聯絡admin@php.cn
    最新問題
    TP5.1首發教程和獨孤九劍的TP5教程區別
    來自於 1970-01-01 08:00:00
    0
    0
    0
    有什麼經典的symfony1.2教程
    來自於 1970-01-01 08:00:00
    0
    0
    0
    js進階教程
    來自於 1970-01-01 08:00:00
    0
    0
    0
    怎麼沒有mui教程
    來自於 1970-01-01 08:00:00
    0
    0
    0
    苦尋php中的ssl加密教程
    來自於 1970-01-01 08:00:00
    0
    0
    0
    熱門教學
    更多>
    最新下載
    更多>
    網站特效
    網站源碼
    網站素材
    前端模板