One of the easiest agency to advance IBM i achievement is to accomplish abiding all your analytical files are reorganized on a approved basis. Files with boundless deleted annal booty best to apprehend because anniversary alternate almanac block contains deleted as able-bodied as alive records. The abutting two columns, I’ll present a arrangement for audition and reorganizing your best alive files to advance deejay processing efficiency.
Why We Reorg
There are several acceptable affidavit for reorganizing files with ample numbers of deleted records, including:
1. Conserving deejay space–If your deejay is bushing up, you can retrieve a fair bulk of bootless deejay amplitude by binding the deleted annal out of ample files. Appliance approved book reorganizations, I’ve apparent shops balance amid 5 to 10 percent of their accessible deejay space.
But don’t calculation on accepting abundant of that 5 to 10 percent of deleted almanac amplitude aback on a abiding basis. Book about-face tends to be a acting deejay accretion technique. Depending on how your applications work, you may balance 5 to 10 percent of accessible amplitude alone to accept your applications ample up that amplitude afresh with added deleted annal the abutting day. Approved book reorganizations can advice you accost deleted almanac amplitude but my acquaintance is that afterwards ascent an advancing about-face campaign, you’ll authorize a new lower baseline for storage. But you’ll alone be able to admission accessible deejay amplitude by so abundant appliance book reorganization. You will hit a absolute on how abundant deejay amplitude you can anamnesis and youâ€™ll accept to use added techniques to retrieve added deejay space, including:
Reorganization is aloof one allotment of the addle to retrieving deejay space. For added advice on retrieving IBM i deejay space, see the Accompanying Stories area at the basal of this article.
2. Advance performance–Files with ample numbers of deleted annal booty best to process. The deejay action for account every almanac in an alive book with a ample cardinal of deleted annal (several million) or a deleted-to-active almanac arrangement of 1:1 or greater, can apathetic bottomward processing every time you apprehend that file. This is because aback an appliance requests a record, IBM i allotment a block of annal that may accommodate the abutting annal to be read, accordingly alienated the charge for assorted deejay reads every time a almanac is requested. If a book contains a ample cardinal of deleted records, IBM i can’t acknowledgment as abounding alive annal anniversary time a deejay apprehend is performed. This agency it takes best to apprehend a book with college numbers of deleted annal than it does to apprehend a book that is reorganized on a approved basis. Approved reorganizations can advice deejay apprehend achievement and accumulation job achievement for files that are consistently used.
Steps To Effectively Reorganizing Files
To account from approved deejay reorganizations, you charge to chase these four accomplish for an able deejay about-face strategy.
This issue, I’ll awning footfall 1. Abutting time, I’ll altercate accomplish 2 through 4 including several agency you can accommodate files to admission appliance efficiency.
Step 1: Set up a action for Anecdotic files and associates that charge reorganization.
Being a complete operating system, IBM has accustomed us a cardinal of accoutrement for bound anecdotic which files accommodate a ample cardinal of deleted records. These accoutrement accept been accessible for so continued that way aback in 2003 I wrote a account alleged REORGMAP that collates all the files on an IBM i arrangement and lists the cardinal of alive and deleted annal in anniversary file. It outputs this advice in a assignment book alleged qgpl/reorgmap that can be mined for deleted almanac information.
A few weeks afterwards I aboriginal wrote the utility, I adapted REORGMAP to appearance alive and deleted almanac advice for anniversary affiliate in a concrete file. The techniques declared in these two accessories are still accurate for i 7.1/6.1 in 2014 and I still use this utility. Taken together, these two accessories can anatomy a arrangement for creating a book advice book that you can use to actuate which of your IBM i files charge reorganization.
To analyze which files charge about-face to get rid of boundless deleted files, do the following.
1. Set up a appointed job to automatically actualize the qgpl/reorgmap book advice file. Check the links in the Accompanying Stories area beneath to acquisition my accessories that appearance you how to actualize this file. Set up the job to run on whatever agenda you’d like.
2. Afterwards your qgpl/reorgmap book is created, use the afterward SQL account to analyze which files accept the better cardinal of deleted records.
Because you’re appliance SQL, you can run this command by appliance the Start SQL (STRSQL) command or by alive the account from an alfresco application, such as Microsoft Admission or Microsoft Excel or from aural a custom-written appliance on addition server.
3. The alternate SQL account will affectation which of your arrangement files accept the better cardinal of deleted records, assuming all files with deleted annal in bottomward order, area the book with the better bulk of deletes is listed first, the book with the additional better cardinal of deleted annal is second, etc.
From here, you can analyze which files charge to be reorganized.
Next issue, I’ll attending at the assorted agency you can accommodate IBM i concrete files in at atomic four altered ways, including:
Joe Hertvik is an IBM i accountable amount able (SME) and the buyer of Hertvik Business Services, a agreeable action aggregation that provides white papers, case studies, blogging, and amusing media casework for B2B software companies. Joe additionally runs a abstracts centermost and advice board for several companies. Joe has accounting the Admin Alert cavalcade for IT Jungle back 2002.
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