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Anyone having acceptable performance with SQL Server + odbc? (programming.dev)
submitted 2 months ago by kSPvhmTOlwvMd7Y7E@programming.dev to c/programming@programming.dev
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Omg it's sooo daammmn slooow it takes around 30 seconds to bulk - insert 15000 rows

Disabling indices doesn't help. Database log is at SIMPLE. My table is 50 columns wide, and from what i understand the main reason is the stupid limit of 2100 parameters in query in ODBC driver. I am using the . NET SqlBulkCopy. I only open the connection + transaction once per ~15000 inserts

I have 50 millions rows to insert, it takes literally days, please send help, i can fucking write with a pen and paper faster than damned Microsoft driver inserts rows

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[-] kSPvhmTOlwvMd7Y7E@programming.dev 1 points 2 months ago

I timed the transaction and opening of the connection, it takes maybe a 100 milliseconds, absolutely doesn't explain ghe abysmal performance

Transaction is needed because 2 tables are touched, i don't want to deal with partially inserted data

Cannot share the code, but it's python calling .NET through "clr", and using SqlBulkCopy

What do you suggest i shouldn't be using that? It's either a prepared query, with thousands of parameters, or a plain text string with parameters inside (which admittedly, i didn't try, might be faster lol)

[-] RagingHungryPanda@lemm.ee 3 points 2 months ago* (last edited 2 months ago)

One thing to know about transactions is that they track data and then write it. It's not the opening that slows it down. I have a question though, what is your source data? Do you have a big CSV for something? Can you do a db to db transfer instead? There's another tool called the BCP utility.

Edit: SQL server/ssms have tools for doing migrations and batch imports

this post was submitted on 06 Sep 2024
14 points (81.8% liked)

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