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The model for the cost of operations used by the SQL Server query optimizer
to produce an execution plan
is rather simple.
It has been largely unchanged since SQL Server version 7, RTM in 1998.
Back then, SQL Server had not yet achieved tier 1 status with commensurate
Some adjustments were made in version ...
The key to Hyper-Threading is in there being significant round-trip memory access no-op cycles. For transactions, this is very true. In other posts, I have suggested that this might be around 5% of instructions, meaning that perhaps only 12% of cycles are actually used by a thread. Hence scaling with HT is almost linear in the absence of ...
In principle, Azure, AWS etc. are good options to have. Very few companies have the resources to hyper-optimize IT infrastructure administration. Some have fallen into the trap of gold-bricking, using "enterprise" SANs, i.e. about $6K per HDD. Other have become obstructors of IT.
The problem is that every time something good comes ...
There are a number of interesting questions in parallel execution performance
that can be investigated using the TPC-H kit, which has a data generator.
There are also supplemental files that accompany published results.
Important questions in parallel execution are:
scaling versus degree of parallelism (DOP) on physical cores, ...
change the order to
DROP TABLE dbo.Table2, dbo.Table1
to avoid the foreign key constraint
Server system memory capacities have grown to ridiculously large levels
far beyond what is necessary now that solid-state storage is practical.
Why is this a problem?
Because the requirement that memory capacity trumps other criteria has
driven system architecture to be focused exclusively on low cost DRAM.
DDR DRAM, currently in its ...
There is an article on
that a new Intel processor architecture to succeed the lake processors
(Sky, Cannon, Ice and Tiger)
will be ''faster and leaner'' and more interestingly might not be entirely
compatible with older software.
The original source is
I suppose it is curious that the Lake processors form a ...
It should be intuitively obvious that round-trip memory access latency
is one of the most important factors in modern server system architecture
for transaction processing databases.
Yet this is a topic that no one talks about.
Vendors do not want to discuss this because no near or long-term actions are planned.
Outsiders cannot write a ...
almost 20 years ago, when Intel was doing the SSE vector floating point in what became Pentium III, there was some thought that this was an important feature that required 2M transistors back when 2M transistors was a lot (PII was 7.5M, Katmai PIII 9.5M), it ought to get a premium over same frequency PII.
However, the reality was that software ...
could you be specific on which OCZ products, ex, Vertex/Vector, or the low end?