Oren Eini

aka Ayende Rahien

Oren Eini

CEO of RavenDB

a NoSQL Open Source Document Database

Get in touch with me:

oren@ravendb.net

+972 52-548-6969

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RavenDB Workshops - Deep dive into practical use of Document Data Modeling

Jan 03 2006

That is not a small script

time to read 1 min | 165 words

I'm doing some work on the SQL scripts, mainly converting them from cursors-style to set style, and I'm getting nice performance improvements from it. (Greater than 5 minutes to 13 seconds). But the problem is that I'm getting a really long SQL Statement. I'm not a SQL guy, so I'm not sure how odd it is, but a 40 lines statement seems a bit too much to me (Insert from select with nested selected for some of the values.)

I'm afraid that it's not going to be easy to figure out what is going on there six month from now (OTOH, it's not easy to figure out what is happening with the cursors, either).

Somewhat related, I broke my personal record and tried to run a script containing over 110,000 lines (machine generated, data migration) script. My paitaince run out before it did, but I was surprised that SQL can accept such a large query (and no, that wasn't a single statement, it was several hundreds).

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RECENT COMMENTS

Dmitry, Yes, but this is _known_ to be a 64 bits system - since we are allocating 3GB (not possible in 64 bits). Note t...

By Oren Eini on Answer: What does this code do?
That's why it is a good idea to compare the return value of `write` to the buffer size. "size_t" can be 32-bit on some system...

By Dmitry on Answer: What does this code do?
There's a reason we miss `write_exact` and `read_exact` from the standard library. In fact, I am surprised the chunk is actua...

By Pyth0n on Challenge: What does this code do?
kpvleeuwen, I agree, unfortunately I don't have anyone to ask off the top of my head. Thanks, I fixed the headers.

By Oren Eini on Performance discovery: IOPS vs. IOPS
It could be interesting to reach out to storage firmware developers and ask what write patterns they think would be useful ex...

By kpvleeuwen on Performance discovery: IOPS vs. IOPS

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