documented<\/a> – everything is in the doc. But an example may be useful to understand it before you need it.
\n
\nLet’s create and drop several times the DEMO table. I change the column name so that I can check easily which one has been restored<\/p>\n\n20:03:10 SQL> create table DEMO(id number constraint DEMOPK primary key , C1 char );\nTable created.\n20:03:12 SQL> drop table DEMO;\nTable dropped.\n20:03:12 SQL> create table DEMO(id number constraint DEMOPK primary key , C2 char );\nTable created.\n20:03:14 SQL> drop table DEMO;\nTable dropped.\n20:03:14 SQL> create table DEMO(id number constraint DEMOPK primary key , C3 char );\nTable created.\n20:03:16 SQL> drop table DEMO;\nTable dropped.\n20:03:16 SQL> create table DEMO(id number constraint DEMOPK primary key , C4 char );\nTable created.\n20:03:18 SQL> drop table DEMO;\nTable dropped.\n20:03:18 SQL> create table DEMO(id number constraint DEMOPK primary key , C5 char );\nTable created.\n20:03:20 SQL> drop table DEMO;\nTable dropped.\n20:03:20 SQL> create table DEMO(id number constraint DEMOPK primary key , C6 char );\nTable created.\n20:03:22 SQL> drop table DEMO;\nTable dropped.\n<\/code><\/pre>\nHere is what I have in recycle bin<\/p>\n
\n20:03:22 SQL> select object_name,original_name,type,dropscn,createtime,droptime from user_recyclebin order by dropscn;\n \nOBJECT_NAME ORIGINAL_N TYPE DROPSCN CREATETIME DROPTIME\n------------------------------ ---------- ---------- ---------- ------------------- -------------------\nBIN$KF+J+xYlFjngU3VOqMB9Kw==$0 DEMOPK INDEX 4350801 2016-01-02:20:03:10 2016-01-02:20:03:12\nBIN$KF+J+xYmFjngU3VOqMB9Kw==$0 DEMO TABLE 4350804 2016-01-02:20:03:10 2016-01-02:20:03:12\nBIN$KF+J+xYoFjngU3VOqMB9Kw==$0 DEMOPK INDEX 4350830 2016-01-02:20:03:12 2016-01-02:20:03:14\nBIN$KF+J+xYpFjngU3VOqMB9Kw==$0 DEMO TABLE 4350833 2016-01-02:20:03:12 2016-01-02:20:03:14\nBIN$KF+J+xYrFjngU3VOqMB9Kw==$0 DEMOPK INDEX 4350857 2016-01-02:20:03:14 2016-01-02:20:03:16\nBIN$KF+J+xYsFjngU3VOqMB9Kw==$0 DEMO TABLE 4350861 2016-01-02:20:03:14 2016-01-02:20:03:16\nBIN$KF+J+xYuFjngU3VOqMB9Kw==$0 DEMOPK INDEX 4350885 2016-01-02:20:03:16 2016-01-02:20:03:18\nBIN$KF+J+xYvFjngU3VOqMB9Kw==$0 DEMO TABLE 4350889 2016-01-02:20:03:16 2016-01-02:20:03:18\nBIN$KF+J+xYxFjngU3VOqMB9Kw==$0 DEMOPK INDEX 4350912 2016-01-02:20:03:18 2016-01-02:20:03:20\nBIN$KF+J+xYyFjngU3VOqMB9Kw==$0 DEMO TABLE 4350915 2016-01-02:20:03:18 2016-01-02:20:03:20\nBIN$KF+J+xY0FjngU3VOqMB9Kw==$0 DEMOPK INDEX 4350939 2016-01-02:20:03:20 2016-01-02:20:03:22\nBIN$KF+J+xY1FjngU3VOqMB9Kw==$0 DEMO TABLE 4350943 2016-01-02:20:03:20 2016-01-02:20:03:22\n \n12 rows selected.\n<\/code><\/pre>\nand my goal now is to restore a previous version.<\/p>\n
issue flashback multiple times<\/h3>\n
So the documentation tells to issue multiple flashback commands:<\/p>\n
\n20:03:22 SQL> flashback table DEMO to before drop;\nFlashback complete.\n \n20:03:22 SQL> desc DEMO;\n Name Null? Type\n -------------- -------- --------\n ID NOT NULL NUMBER\n C6 CHAR(1)\n<\/code><\/pre>\nthat’s the latest version. Let’s issue the command again:<\/p>\n
\n20:03:22 SQL> flashback table DEMO to before drop;\nflashback table DEMO to before drop\n*\nERROR at line 1:\nORA-38312: original name is used by an existing object\n<\/code><\/pre>\nYes of course, I have to drop it before.<\/p>\n
\n20:03:22 SQL> drop table DEMO;\nTable dropped.\n \n20:03:22 SQL> flashback table DEMO to before drop;\nFlashback complete.\n \n20:03:22 SQL> desc DEMO;\n Name Null? Type\n -------------- -------- --------\n ID NOT NULL NUMBER\n C6 CHAR(1)\n<\/code><\/pre>\nOk, as I dropped it just before, that the latest version that is restored…<\/p>\n
purge<\/h3>\n
If I want to issue multiple flashback table commands, I have to drop purge so that the intermediate restored tables don’t go to recycle bin<\/p>\n
\n20:03:22 SQL> drop table DEMO purge;\nTable dropped.\n \n20:03:23 SQL> flashback table DEMO to before drop;\nFlashback complete.\n \n20:03:23 SQL> desc DEMO;\n Name Null? Type\n -------------- -------- --------\n ID NOT NULL NUMBER\n C5 CHAR(1)\n<\/code><\/pre>\nthat’s fine: I restored the N-1 version.<\/p>\n
rename<\/h3>\n
The other solution is to restore it to another table, dropping that other table, or changing name each time:<\/p>\n
\n20:03:23 SQL> flashback table DEMO to before drop rename to DEMO1;\nFlashback complete.\n \n20:03:23 SQL> desc DEMO1;\n Name Null? Type\n -------------- -------- --------\n ID NOT NULL NUMBER\n C4 CHAR(1)\n \n20:03:23 SQL> flashback table DEMO to before drop rename to DEMO2;\nFlashback complete.\n \n20:03:23 SQL> desc DEMO2;\n Name Null? Type\n -------------- -------- --------\n ID NOT NULL NUMBER\n C3 CHAR(1)\n<\/code><\/pre>\nHere I rewind two older versions.<\/p>\n
name the recycle bin object<\/h3>\n
But there is a direct possibility if you know the version you want from the DBA_RECYCLEBIN view.<\/p>\n
\n20:03:23 SQL> desc \"BIN$KF+J+xYpFjngU3VOqMB9Kw==$0\"\n Name Null? Type\n -------------- -------- --------\n ID NOT NULL NUMBER\n C2 CHAR(1)\n<\/code><\/pre>\nAnd I restore that directly to a new table:<\/p>\n
\n20:03:23 SQL> flashback table \"BIN$KF+J+xYpFjngU3VOqMB9Kw==$0\" to before drop rename to DEMO3;\nFlashback complete.\n<\/code><\/pre>\nSo that’s probably the fastest way to restore an old version.<\/p>\n
All that is possible because each time we flashback to before drop, the restored version is removed from the recycle bin.
\nFrom my example, only one remains here:<\/p>\n
\n20:03:24 SQL> select object_name,original_name,type,dropscn,createtime,droptime from user_recyclebin order by dropscn;\n \nOBJECT_NAME ORIGINAL_N TYPE DROPSCN CREATETIME DROPTIME\n------------------------------ ---------- ---------- ---------- ------------------- -------------------\nBIN$KF+J+xYlFjngU3VOqMB9Kw==$0 DEMOPK INDEX 4350801 2016-01-02:20:03:10 2016-01-02:20:03:12\nBIN$KF+J+xYmFjngU3VOqMB9Kw==$0 DEMO TABLE 4350804 2016-01-02:20:03:10 2016-01-02:20:03:12\n<\/code><\/pre>\nso the safest way is probably to flashback to a different table name each time, and clean that only when you’re sure you don’t need them anymore.<\/p>\n","protected":false},"excerpt":{"rendered":"
By Franck Pachot . FLASHBACK TABLE restores the latest version that is available in recycle bin. If you did multiple drop \/ create you may want to restore oldest versions. Of course it’s documented – everything is in the doc. But an example may be useful to understand it before you need it.<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229],"tags":[96],"type_dbi":[],"class_list":["post-6620","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","tag-oracle"],"acf":[],"yoast_head":"\n
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