VISIT WEBSITE >>>>> http://gg.gg/y83ws?8824032 <<<<<<
And spoiler Let's take a look at the performance of Entity Framework. Don't forget to use the AddRange method, instead of iterating through the whole collection and adding the records one by one with the Add method.
The AddRange method is significantly faster because it disables change detection automatically. Each statement inserts multiple customers at once, which seems to be the cause of our next speed gain.
We can notice that using Entity Framework, speeds up the inserts again. I think this is because it inserts multiple records at once instead of record per record. This can be verified by tweaking the Generating the SQL command text to reflect this way of working. But we can quickly experience why Entity Framework chops the insert statements in batches.
When TF is active, the number of estimated rows to insert still needs to be at least TF affects the minimal logging decision for FastLoadContext only it is effective for partitioned heaps as far as DMLRequestSort is concerned, but has no effect on the heap itself, since FastLoadContext only applies to indexes.
Fast Load Context As a quick reminder, the RowsetBulk facility covered in parts 1 and 2 enables minimally-logged bulk load for: Empty and non-empty heap tables with: Table locking; and No secondary indexes. The FastLoadContext code path adds support for minimally-logged and concurrent bulk load on: Empty and non-empty clustered b-tree indexes.
Empty and non-empty nonclustered b-tree indexes maintained by a dedicated Index Insert plan operator. Rows are inserted one at a time by the Index Insert operator and fully logged in the following cases: All rows added to the first index page, if the index was empty at the start of the operation. Rows added to existing index pages. Rows moved between pages by a page split. FOptimizeInsert The sqllang!
CUpdUtil::FOptimizeInsert code requires: More than rows estimated to be inserted; and More than 2 pages estimated insert data size; and The target index must have fewer than 3 leaf pages.
Operation , FD. Context , FD. AllocUnitName , FD. PK dbo. Test id ' ; GO. Test id ' ;. Back to Top. All rights reserved. User contributions are licensed under cc-sa with attribution required.
It's not bad if you're inserting thousands of rows per batch but guess what happens when you insert just one row for example? You cannot control it at the database level, which is a real bummer if you consolidate many applications' databases on a single server to save a shedload of money on SQL Server licensing fees!.
It's a bummer that they didn't create a mechanism to fix this problem at the database scope. The fix is to enable Trace Flag can be done at the session level but that doesn't fix existing code , which disables the new "Fast Insert" technology and set's things back to the way they were prior to And, I, for one, have to invoke that Trace Flag.
Products like "WhatsUp Gold" use it exclusively for all of their inserts. It was a good idea for them to do so but the new "feature" implementation caused my 8. The other "Fix" is to simply rebuild your indexes. Why is that a problem for me? The trouble is that such indexes show very little logical fragmentation in sys. You can read more about Trace Flag and how to use it to solve this "3rd type of fragmentation". It pretty much summarizes what I wrote about above and have been almost feverishly testing.
Here's the URL. Look for "" in the article. The answer is simple I have to do a whole lot more index maintenance that I otherwise wouldn't have to do. This won't be a problem with inserts that insert a large number of rows but is a huge problem with code that inserts small numbers of rows per batch especially those that insert rows in a totally RBAR fashion. Jeff, from where did you get this idea? I've got a link somewhere thought it was in the first one I posted but not.
I'll take the time to look for it especially if it's that wrong. It might help me from understand a bit more about the mistake that I made in reading a different post. Hybris95 Hybris95 2, 2 2 gold badges 14 14 silver badges 30 30 bronze badges. Galcoholic Galcoholic 2 2 silver badges 8 8 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.
The Overflow Blog. Podcast The first ten years of our programming lives. Upcoming Events. Featured on Meta. Now live: A fully responsive profile. Candidate changes in Moderator Election — review your ballot. Linked 1. Related
Comentarios