在SQL Server上插入/更新表锁

Question

I have a big table with around 70 columns in SQL Server 2008. A multithreaded .NET application is calling a stored proc on database to insert into / update the table. Frequency is around 3 times a second.

I have made weekly partitions on table since almost every query has a datetime constraint on the table.

Sometimes it takes a long time to insert/update the table. I am suspicious that sometimes INSERTION makes UPDATE wait; sometimes UPDATE makes INSERTION wait. Is it possible?

How can I design the table to avoid such locks? Performance is the main issue here.

Answer 1

You're right that you're probably hitting deadlocks causing things to wait. A couple things to check first;

1. Are your indexes correct?
2. If your DB is in 'Full' recovery mode do you need it? Simple recovery really speeds up inserts/updates, but you loose point-in-time restores for backups.
3. Are you likely to have multiple threads writing the same record? If not, NOLOCK might be your friend here, but that would mean your data might be inconsitent for a second or two on occasion.