{"id":264,"date":"2016-03-02T19:22:14","date_gmt":"2016-03-02T18:22:14","guid":{"rendered":"https:\/\/www.carajandb.com\/2016\/03\/02\/datapump-en\/"},"modified":"2018-02-09T10:10:47","modified_gmt":"2018-02-09T09:10:47","slug":"datapump-en","status":"publish","type":"post","link":"https:\/\/carajandb.com\/en\/2016\/03\/02\/datapump-en\/","title":{"rendered":"Datapump or Flashback Database"},"content":{"rendered":"

Do you need Datapump?<\/h2>\n

At nearly every customer I’m visiting there is a need to take export dumps of the entire database every single day. But why?
\nYou probably know the answer: because the application team requested it to reset a schema or a table to an earlier time in the event due to a user failure, batch error or whatever.
\nMy next question is this: “How often did you reset a table or a schema within the last 12 months?”
\nAnswer: \u201cNot a single time… but we had to do it some years ago with one of our databases. So its still important.\u201d
\n
\nLet me recap:<\/p>\n

You take terabytes of dumpfiles every day, which not only consumes space, but will degrade performance and probably shrink the maintenance window for batches etc. only for a protection which did not happen at all for all of your databases within the last 12 months? And keep in mind: datapump export is not a backup! So you hopefully have a valid RMAN backup as well. Which again consumes space, will degrade performance and shrinks the maintenance window for batches. Isn’t there a better way to fulfill this “need”?
\nWe will first look at the reasons why it might be necessary to reset a table or schema. Even though it sounds strange, but I have seen some production databases where developers had full access or more where the application run with DBA privilege. Not only is this a security and compliance issue but an easy way to destroy data and therefore to reset tables or schemas.
\nSo here is my first recommendation: Do not allow development on a production database. If a senior developer or analyst needs access, it should be limited to a read only access. If data needs to be changed via a tool like Toad, grant the minimum privilege (e.g. update) to that owner but only for a very limited time frame.
\nBut what about the DBA himself? Yes, this could be a problem as well. My personal solution: I’m using Toad for all necessary operations with read-only database access.
\n\"datapump2
\nThis little checkbox is very useful as it doesn\u2019t allow an INSERT, UPDATE, DELETE regardless if you are using schema browser or any other graphical tool, but it also works within the editor.
\nSo if I need to make a change I have to explicitly log out, change the box, and login again. This might sound cumbersome, but if you have hundreds of databases to manage you will appreciate it.
\nBut still there is a chance for a failure, where you need to rollback an application. If this application is the only one in the database, you can simply flashback the databases to a former point in time. To use this feature, you need to set up the database in flashback mode.<\/p>\n

Flashback Database<\/h2>\n

Flashback database only works with archive log mode enabled \u2013 that should be a no brainer for production databases. Unfortunately, you need to shut down the database to enable flashback and you need to calculate the space for the flashback logs.<\/p>\n

SQL> SHUTDOWN IMMEDIATE \r\nSQL> STARTUP MOUNT \r\nSQL> ALTER DATABASE FLASHBACK ON; \r\nSQL> ALTER DATABASE OPEN; \r\nSQL> SELECT flashback_on, log_mode FROM v$database; \r\nFLASHBACK_ON       LOG_MODE \r\n------------------ ------------ \r\nYES                ARCHIVELOG<\/pre>\n
The main question is: how far back you need to roll your database at max? Is it one hour or one day. Every time frame older than one day is often useless as you lose too many transactions. But even three days might be worth thinking of because this might have been a weekend. Let\u2019s assume you have a batch job, which runs on Friday evening and on Monday people complain about the data. With the three days\u2019 window and the assumption that there have not been that many transactions in the meantime you can flashback the database within few minutes to resolve the issue. This implies that you have sufficient space to hold three days of archived redo logs plus three days of flashback logs \u2013 probably not a small amount of data, but much faster as if you had to import your schema after this kind of error.
\nBut what if you have multiple schemas in one database? Other application owners might not be happy if you roll back their daily work just because one application failed.
\nIf you have a standby database with flashback database enabled as well you can simply flashback the standby database to the point in time you need and export\/import the data you need.
\nAssuming that you are using Oracle Dataguard it’s a four step approach:<\/p>\n
    \n
  1. Stop the Dataguard apply process<\/li>\n
    DGMGRL> EDIT DATABASE 'HERBERT_S2' SET STATE='APPLY-OFF'; \r\nDGMGRL> DISABLE CONFIGURATION;<\/pre>\n
  2. Create a guaranteed restore point to later resync the standby database<\/li>\n
    SQL> CREATE RESTORE POINT before_open_standby GUARANTEE FLASHBACK DATABASE;<\/pre>\n
  3. Now you can flashback the standby database and open it read-write or read-only.<\/li>\n
    SQL> FLASHBACK DATABASE TO TIMESTAMP \"to_date('YYYY-MM-DD HH24:MI:SS\u2019,\u20192016-02-29 10:00:00')\"; \r\nSQL> ALTER DATABASE OPEN;<\/pre>\n
  4. Now you are able to query the database or to export the data. After you\u2019ve finished your research you can close the database roll it forward to the guaranteed restore point and resync it with your production database.<\/li>\n
    SQL> SHUTDOWN IMMEDIATE \r\nSQL> STARTUP MOUNT \r\nSQL> FLASHBACK DATABASE TO RESTORE POINT before_open_standby; \r\nSQL> ALTER DATABASE CONVERT TO PHYSICAL STANDBY; \r\n\r\nDGMGRL> ENABLE CONFIGURATION \r\nDGMGRL> EDIT DATABASE 'HERBERT_S2' SET STATE='APPLY-ON';<\/pre>\n<\/ol>\n
    This will minimize the impact of a rollback of transactions to a minimum while eliminating the need for daily exports though saving space and shrinking the time frame for maintenance.<\/p>\n
    In one of my next blogs I will extend this functionality to the new multitenant database architecture.<\/p>\n","protected":false},"excerpt":{"rendered":"
    Do you need Datapump? At nearly every customer I’m visiting there is a need to take export dumps of the entire database every single day. But why? You probably know the answer: because the application team requested it to reset a schema or a table to an earlier time in the event due to a user failure, batch error or whatever. My next question is this: “How often did you reset a table or a schema within the last 12 months?” Answer: \u201cNot a single time… but we had to do it some years ago with one of our databases. […]<\/p>\n","protected":false},"author":3,"featured_media":653,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_crdt_document":"","_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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Ahrends","author_link":"https:\/\/carajandb.com\/en\/author\/9aa6cdb2095bd409\/"},"uagb_comment_info":0,"uagb_excerpt":"Do you need Datapump? At nearly every customer I’m visiting there is a need to take export dumps of the entire database every single day. But why? You probably know the answer: because the application team requested it to reset a schema or a table to an earlier time in the event due to a…","_links":{"self":[{"href":"https:\/\/carajandb.com\/en\/wp-json\/wp\/v2\/posts\/264","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/carajandb.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/carajandb.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/carajandb.com\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/carajandb.com\/en\/wp-json\/wp\/v2\/comments?post=264"}],"version-history":[{"count":0,"href":"https:\/\/carajandb.com\/en\/wp-json\/wp\/v2\/posts\/264\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/carajandb.com\/en\/wp-json\/wp\/v2\/media\/653"}],"wp:attachment":[{"href":"https:\/\/carajandb.com\/en\/wp-json\/wp\/v2\/media?parent=264"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/carajandb.com\/en\/wp-json\/wp\/v2\/categories?post=264"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/carajandb.com\/en\/wp-json\/wp\/v2\/tags?post=264"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}