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SQL Tricks « from the gut
Shane on June 29th, 2007

My latest debacle loading this massive table has to do with removing duplicates before I try adding a primary key to the table. I had to restart the load process a couple times before I finally settled into a method that worked well. (Running multilpe instances of DTExec on different subsets of the source data, [...]

Continue reading about Massive In-Place Delete

Shane on June 28th, 2007

Dear Shane, Next time trust me. SELECT INTO is always faster than UPDATE when you’re talking about updating the entire table. Even if the table has three NVARCHAR(MAX) fields and you’re only updating one 4 byte INT column. Rather than run an update for 1hr 6min before you decide to cancel said query and trigger [...]

Continue reading about BULK UPDATE

Shane on February 12th, 2007

Also on the subject of checksum testing, this query will generate a checksum query for a given table. Use this query to generate the checksum for each table, then customize the sum() clauses if you did any transformations on your data. select case a.xtype when 167 then ‘SUM(LEN(‘+a.name+’)) as sum_len_’+a.name+’,’ when 175 then ‘SUM(LEN(‘+a.name+’)) as [...]

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Shane on January 31st, 2007

select upper(b.name) as table_name, upper(a.name) as column_name, a.colid, a.length, a.xprec, a.xscale, a.xtype,(CASE WHEN a.xtype=167 then ‘varchar’ WHEN a.xtype=175 then ‘char’ WHEN a.xtype=61 then ‘datetime’ WHEN a.xtype=106 then ‘decimal’ END) as col_type from syscolumns a, sysobjects b where a.id=b.id and b.xtype=’U’ and upper(b.name) ‘DTPROPERTIES’ order by b.name, a.name, a.colid

Continue reading about Extracting Metadata From SQL Server

Shane on January 31st, 2007

Here is a useful query for getting a list of failed jobs from SQL Server. If you are responsible for tracking and logging job failures, this administrative work can be overwhelming in a busy week. This query will list all jobs that failed during a given time period. It uses a function that I created, [...]

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