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Oracle Database 10g: New Features for Oracle8i OCPs practice test
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Database Migration - A deliberate method

a fairly regular experience in a database's lifecycle is that of the migration from edition "older" to edition "newer." Migrating from one version to another could be as simple as exporting the ancient and importing into the new, but likelihood is there's a lot more concerned than first meets the attention. It isn't uncommon to also comprise other enormous adjustments reminiscent of an operating gadget alternate, a schema amendment, and alterations to linked functions. each and every trade has its personal inherent possibility, but lumping them together in a single operation flies in the face of commonplace feel, even more so without needing confirmed the migration from start to end. Amazingly, this condition occurs all too regularly.

From a application engineering standpoint, is it protected or a most efficient practice to heap so many tremendous adjustments together in a single step? extra, would it appear obvious that you would want to one, not best follow the migration, but two, examine the changes earlier than really making use of them to your live/creation atmosphere?

right here is anything else to believe: wreck a dependency chain earlier than it breaks you and the migration manner. Given the state of affairs of migrating from Oracle8i to 10g, changing the underlying operating gadget to Linux from Solaris, editing main tables within a schema, and working more moderen/modified versions of linked functions, the place are the places that you would be able to damage the dependency chain? Put an extra means, what are the safer/standard/"charted by using many others before you" steps, and which can be the uncharted/"applies handiest to you" steps?

Separate the conventional from the unknown (the place versus how)

For non-cutting edge/early adopter/early implementers ("sure, we're more than chuffed to deliver their production atmosphere as a beta checking out ground for the relaxation of the realm") of a brand new edition of Oracle, by the point you (and your business) are ready to migrate from an older edition of the RDBMS software to a more recent one, many others will have long gone earlier than you. Likewise, many others have already crossed over to the dark side by using having adopted Linux as their underlying OS.

in view that the combined RDBMS/OS version alternate because the familiar, this mixture is additionally the "where" a part of "the place versus how." the place your production database lives in terms of edition and OS is a logical vicinity to destroy the dependency chain. In an all-or-nothing do-or-die migration situation, failure capacity dropping the time spent on what's in all probability the least difficult part of the situation, particularly, the hours spent on exporting and importing. in case you can separate the usual migration into as a minimum two diverse degrees, you will have damaged the dependency chain into smaller chains. The tenet/lesson to be realized right here is to movement from point A to D by way of safe, incremental steps.

lamentably, no person can authoritatively let you know what the most excellent method is for "how." How your database operates with appreciate to schema and utility interaction is up to you to examine. unless you have got absolutely check driven schema and utility alterations, this a part of the ordinary migration technique stays within the realm of the unknown. Going are living and finding out – for the first time – that the new utility/database code consequences in cascading triggers (thereby bringing an example to its knees, so to talk) is most likely a poor time to develop into privy to this circumstance. builders and testers using a hundred statistics as a check size when the creation ambiance incorporates tens of millions facts is rarely an intensive check.

Export and Import via a proactive strategy

With recognize to the export and import utilities, you won't have to settle for the default parameters. in fact, you owe it to your self to use quite a few non-default settings, and doing so makes the procedure more straightforward to function and saves time when it's time do it for real. Let's seem on the indexfile parameter as a beginning. There are (at the least) four incredible explanations to use indexfile=filename on an import.

the primary is that the output documents the storage of tables and indexes (all or some, depends upon what turned into covered in the export dump file). where is your source code for schema advent? if you would not have supply code, this parameter (along with a reasonably elementary question that returns everything else) goes a really good way in opposition t offering that tips. The query half is spooling out the contents of all or user_source. Code for programs, kit bodies, procedures, services, and triggers should be protected in the output. With little or no enhancing equivalent to including "create or change" and cleansing up SQL*Plus artifacts (i.e., feedback, heading, web page breaks – if these weren't suppressed to start with), you are left with the existing supply for a good portion of a schema.

The 2nd is that if you're going to do any housecleaning or rearranging of tables and indexes, now is the time to edit the indexfile and update tablespace mappings and storage parameters. If the logical design is to continue to be the same, then the third cause comes into play.

Separate the tables from the indexes, it's, separate the SQL create statements (one script for tables, the other for indexes). Do as tons as which you could on the goal database earlier than it is time to do the genuine migration. a part of this contains developing the same/new tablespaces and working the create tables script. Run the create tables script ahead of time for two motives: one is to validate the logical layout, the different is to support pace up the import (ideas query: how does import work if an object exists or doesn't exist?).

The fourth rationale comes lower back to the indexes listed in the indexfile. performance-wise, when doing bulk inserts, is it more advantageous to have indexes or now not? What happens when a brand new checklist is inserted? One or extra indexes must be updated (assuming there is at least a first-rate key for that list). Oracle's recommendation is that (for large databases) remember to cling off on developing indexes until in spite of everything the records has been inserted. once more, this comes again to the magnitude of the indexfile since it is the link between export the usage of "indexes=n" (the default is y) and your being able to re-create the indexes after the data has been loaded.

In Closing

in the next article about migration, i will be able to deliver a checklist/plan protecting steps and strategies for the before, all the way through, and after phases. even though you're compelled to bundle collectively 4 predominant adjustments on the identical time, there are proactive measures that you can take to mitigate and cut back chance.

» See All Articles by Columnist Steve Callan


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