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DBMT Optimizations in DDO that can reduce its workload by over 90%
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DDO includes three optimizations to DBMT that make a dramatic difference in its workload:



The first and most powerful setting is the “Only Compact when Freespace exceeds” fields on the Optimization Schedule.

By setting this field a database can only become a candidate for DBMT compacting when the freespace within it exceed the amount specified. This avoids potentially processing hundreds of database where little, or no, freespace can be recovered. This dramatically reduces DBMT processing times, prevents fragmenting those databases, and prevents unnecessary DBIID changes, which also reduces backup requirements.

Here is an example where only 12 databases exceed the Freespace exceeds setting:



As a result when DBMT runs all other databases are excluded from the compact sub-task of DBMT



DBMT therefore only compacts 12 of the 280+ databases


You can further fine-tune the databases that are excluded from compact processing by adding them to the “Exclude the following databases from DBMT processing field” or adding the directory to the “Exclude the following directories from DBMT processing field”

The end result is significantly less time “compacting for the sake of compacting” and the benefits from there are substantial.

One final note, the DBMT optimizations discussed here are only available in DDO.

Why not try DDO for yourself with a free 30 day trial?






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http://ab1osborne.blogspot.com/2016/12/dbmt-optimizations-in-ddo-that-can.html
Dec 08, 2016
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Recent Blog Posts
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DBMT Optimizations in DDO - real world example
Thu, Dec 8th 2016 2:09a   Adam Osborne
Further to my previous post on "DBMT Optimizations in DDO that can reduce its workload by over 90%" here is a real world screen shot of what is happening at one of our clients. Now that's optimization. Why not try DDO for yourself with a free 30 day trial?
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DBMT Optimizations in DDO that can reduce its workload by over 90%
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