cost-based optimization?
February 8th, 2010
Hive team mentioned a lot about “cost-based optimizer”, which I’m not sure if it’s on their road map.
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Archive
Archive for the ‘Academic’ Category
hop counts v.s. transmission rate and latency
January 19th, 2010
There are “no strong correlations between the routing hops (link- or AS-hops) and the transmission
rate (download or upload rate) for a connection”. — TopBT
“The number of AS hops and the latency of a direct IP routing path are correlated, and paths with longer AS hops are likely to have longer latency.” — ASAP
R++ Era
November 11th, 2009
Beginning in the early 1980′s a (sizeable) collection of papers appeared which can be described by the following template:
Consider an application, call it X
Try to implement X on a relational DBMS
Show why the queries are difficult or why poor performance is observed
Add a new “feature” to the relational model to correct the problem…
Lesson learned: “Unless there is a big performance or functionality advantage, new constructs will go nowhere.”
Advice to Graduate Students in Computer Science
August 25th, 2009
This is copied from a pdf file. Original link is: http://www.cra.org/reports/why.cs.phd.pdf. I quote two pages from the file that I think is interesting and useful.
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Computer Architecture Reading List
August 2nd, 2009
These are copied from several schools:
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