On 16 Oct 2014, at 11:07am, Prakash Premkumar wrote:
> Are there any projects where , sqlite optimizer has been extended to add
> System R
The optimizer currently built into SQLite does the same job as what you're
thinking of as "System R". It is not possible to use
Thanks a lot Simon.
Are there any projects where , sqlite optimizer has been extended to add
System R or other algorithms ?
I browsed through the github repository and could not find any.
Thanks a lot for your time.
On Thu, Oct 16, 2014 at 12:49 PM, Simon Slavin
On 16 Oct 2014, at 7:50am, Prakash Premkumar wrote:
> Does sqlite implement the pointers in the System R Algorithm ?
SQLite does not implement the System R Algorithm, so no, it doesn't implement
the pointers from System R. It implements the algorithms described in the
Thanks for your reply Simon.
I have read through those links.
Does sqlite implement the pointers in the System R Algorithm ? Like
assigning selectivity factors for predicates in where clause?
Link to System R Algorithm:
On 15 Oct 2014, at 12:54pm, Prakash Premkumar wrote:
> I'm trying to understand the sqlite select query optimizer. It works by
> assigning costs to each relation in FROM clause.
That is only a little bit of how it works. Have you read these ?
I'm trying to understand the sqlite select query optimizer. It works by
assigning costs to each relation in FROM clause. As far as I understand, it
primarily uses the logarithmic estimate of the number of rows in the
Query optimization algorithms like IBM System R algorithm assigns
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