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Questions tagged [fragmentation]

An unefficient usage of disk storage in memory or hard drive.

189 questions
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Will TCP header be present in IP fragmented packets

What happen when ICMP is disabled in an router and when packet size greater than MTU how the router fragments that packet?Will TCP header be present in IP fragmented packets?
user2622687
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"Out of memory" error for standalone matlab applications - memory fragmentation

I have to deliver an application as a standalone Matlab executable to a client. The code include a series of calls to a function that internally creates several cell arrays. My problem is that an out-of-memory error happens when the number of calls…
imriss
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tcmalloc's fragmentation

Our software implement a actor model system, and we allocate/deallocate the small object very often.I am very sure the each object be destroyed without memory leak. ( I have used valgrind and tcmalloc tool to check the memory leak in my software. No…
xiaoningyb
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Android : Notification not working on 2.3.6 (Samsung galaxy y)

The following code has been confirmed to work fine on devices running HONEYCOMB+. However on Samsung galaxy Y it is not producing any notifications. String tickerText = userString + " Download Queued"; Notification notification = …
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How to use both HTML5 History/State API and keep the hyperlinks with hashtags (links within documents) intact

I implemented ajaxify-html5.js into existing webpage. It uses jQuery, ScrollTo and History.js. Great stuff, works wonderful. Every link like Category 5 gets opened in content window, like it should. Whole thing is just…
humHann
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value of 'More Fragment' bit when IP packet is fragmented multiple times

Suppose I have two hosts, host A and host B, and host A sends a 1500 byte packet to B and there are two routers between them with a MTU of 800 bytes for the first link, and MTU of 500 bytes for the second link between them. As I understand it the…
Cory Gross
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Android Activity causing Service crash due to heap fragmentation

I have an Android app (activity) which also has a corresponding service. The service is started by the activity and is supposed to run continuously even when the activity is stopped. When the activity is started again it can bind to the service and…
chris
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SQL Server: 12% index scan density and 50% fragmentation. How bad is "bad"?

How much fragmentation is bad? How low of scan density is too low? How low does scan density is bad? i have a table with the following index density and fragmentation levels: Name Scan Density Logical…
Ian Boyd
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Will the dbspace change when the value in the row changes under FRAGMENT BY EXPRESSION? (Informix DB)

Unfortunately, I have not found an explanation for this situation in the documentation. In particular, I created a table and fragmented it "FRAGMENT BY EXPRESSION" by the "value" field. In the fragmentation condition, I wrote: value < 100 IN…
Krazy_D
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Are lookups on IDENTITY columns faster if the address space is contiguous?

If I have a very large table with an IDENTITY column (bigint) and this table is subject to deletes, will the fragmentation of the address space (the available IDs) result in slower SELECTS? Clarification: By address space fragmentation I mean the…
Brad
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How to check that java heap is fragmented?

I have a 29G heap dump, created by Hotspot VM after OutOfMemoryError occurred. Heap analyzer (I use YourKit) showed that all objects (including unreachable) take 26G. My guess is remaining 3G are wasted because the heap is fragmented. Is there a way…
Sergey Fedorov
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Correct way of maintenance of SQLServer Cluster Columnstore Index

Cluster Columnstore Index maintenance We are using clustered columnstore index in SqlServer 2016 for 400M rows. We check the time for sample select query - it was 2s just after index creation. After month the same query took up to 20-30 s. Total…
NataliaA
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How fragmentation happens in index?

I had a table of 200GB with an index of 49GB. Only insert and update operation happens to that table. I dropped the existing index and created a new one on the same columns. New index size is only 6GB. I am using postgres database Can someone…
Shailendra
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Converting an overlapping DNA region into a variable and then changing the length of overlapping region

I am relatively new to Python,so I would very much appreciate any constructive feedback on my code and would really appreciate it if you could guide me in the right direction if I a wrong. So I have a designed a program in Python that takes in a…
Parth Patel
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(SQL Server) Why GUID or other random value as high-order key will cause fragmentation?

I'm watching Paul S Randal's index fragmentation video at here. In the video, Paul said that GUID or other random values as high-order key will cause page splits which in turn will cause index fragmentation. The reason is that, random values means…
Just a learner
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