sql server - How can I tell WHY an insert on a certain table is slow ...
I know that an INSERT on a SQL table can be slow for any number of reasons: Existence of INSERT TRIGGERs on the table; Lots of enforced constraints that have to be checked (usually foreign keys) Page splits in the clustered index when a row is inserted in the middle of the table; Updating all the related non-clustered indexes
sql server - Using TOP in INSERT INTO statement - Database ...
INSERT INTO table_name1 (Col1, Col2) SELECT TOP n Col3, Col4 FROM table_name2 Order By Col1; Here is the confusing part. Putting the TOP keyword inside the SELECT statement is supposed to give us a better control over what rows get chosen and inserted through the …
sql server - What is the fastest way to insert large numbers of rows ...
@Kin had a look at the guide but it seems outdated, "The SQL Server destination is the fastest way to bulk load data from an Integration Services data flow to SQL Server. This destination supports all the bulk load options of SQL Server – except ROWS_PER_BATCH." and in SSIS 2012 they recommend the OLE DB destination for better performance.
sql server - Benefits of using WITH TABLOCK on an INSERT
In SQL Server 2016 the TABLOCK hint is required to get parallel insert into heaps, CCIs (Clustered Columnstore Indices), and local temp tables. There are lots of restrictions, some of which aren't documented. There can't be an IDENTITY column, the insert can't be done through an OUTPUT, etc. See also The Data Loading Performance Guide
What is the easiest way to move data from Oracle to SQL Server?
Adding to Craig's comment above - I use Linked servers to refresh a few tables in an Oracle database from SQL Server. You can also pull data to SQL Server using OPENQUERY. INSERT INTO dbo.SQLTable1 SELECT * FROM OPENQUERY(ORALINKEDSERV, 'SELECT * FROM OracleTable1') A couple of links that will help you set up linked server here and here
sql server - What is wrong with this INSERT Statement - Database ...
2014年11月16日 · SQL Server select into vs. insert into performance with embedded cross apply openjson. 2. Azure Synapse ...
sql server - Insert Into Multiple Tables At Once - Database ...
ohh it is easier then.. you just need a staging table with the raw data as it comes from the csv, just add an identity PK and let it be autogenerated by SQL Server engine, then insert the data on the first table customer_contact using your new ID as key, then create an aggregate query to insert info on the other 2 tables (you will also need a ...
sql server - How to insert into TABLE Variable? - Database ...
2018年1月19日 · SQL Server currently only supports this one value. Note, if they're direction ie, pt1-pt2 represents a plane-route or something, I would use a Line instead, See also, SQL Server Point Constructor or version of ST_Point(x,y)? SQL Server Line Constructor or version of ST_MakeLine(pt1,pt2)?
SQL Server: Performance Insert Into vs Select Into - Database ...
2019年2月14日 · Select into can be executed in parallel starting with SQL Server 2014, and parallel insert...select was first implemented in SQL Server 2016. I did not reproduce any performance difference between select into and insert into ..select for temporary tables on SQL Server 2012, all executed in serial.
sql server - How do I copy a table with SELECT INTO but ignore …
2011年1月27日 · select a.* into without_id from with_id a inner join with_id b on 1 = 0; will also give the desired behaviour (of the copied id column to not keep the IDENTITY property. However, it will have the side effect of not copying any row at all! (as with some other methods) so you'll then need to do: insert into without_id select * from with_id;