Monday, September 17, 2012

Copying large files - Fastcopy

If copying large files you might want to consider 'how'.
It comes down to Buffered vs. Unbuffered Input/Output (I/O).

Unbuffered copies are built-in to Win 2008 R2 and the Win 7 version

To perform unbuffered copies on an older system the following tools are useful.


FastCopy  - Download

Eseutil (exchange install) - Download


Ref -
How to copy very large files across a slow or unreliable network






Saturday, September 15, 2012

Tools - Nanozip

A great compression tool which allows you to control how many processors it uses -

c:\>nz a -p2 nanozip.nz "x:\export\*.*"
NanoZip 0.09 alpha/Win32  (C) 2008-2011 Sami Runsas  www.nanozip.net
Intel(R) Xeon(R) CPU 5110 @ 1.60GHz|21926 MHz|#4|1208/2047 MB
Archive: nanozip.nz
Threads: 4, memory: 512 MB, IO-buffers: 4+1 MB
Compressor #0: nz_optimum1 [251 MB]
Compressor #1: nz_optimum1 [251 MB]
Compressed 56 357 924 728 into 4 336 512 403 in 5h 39m 13.10s, 2704 KB/s
IO-in: 31m 53.80s, 28 MB/s. IO-out: 10.15s, 407 MB/s

Download





Friday, September 14, 2012

Finding Default Column Constraints where the columns allow NULLs

Finding Default COlumn Constraints where the columns allow NULLs Investigating a database I wrote these to find some design inconsistencies.

I plan to make a version for foreign key constraints too. SQL 2000 script

SELECT	  
	  u.name AS OwnerName
	, tab.name AS TableName
	, col.name AS ColumnName
	, col.isnullable
	, con.name AS DefaultName 
	, com.text AS DefaultValue
FROM sysobjects tab
INNER JOIN sysusers u ON tab.uid = u.uid
INNER JOIN syscolumns col ON col.id = tab.id
INNER JOIN sysobjects con ON con.id = col.cdefault 
       AND con.xtype = 'D'
INNER JOIN syscomments com ON com.id = con.id 
 LEFT JOIN syscolumns dfc ON dfc.id = com.id
WHERE col.isnullable = 1
ORDER BY 1,2

SQL 2005+ script

SELECT 
	 Tab.name AS Tablename
	,Col.name AS Columnname
	,Col.is_nullable
	,Con.name AS DefaultName
	,[Definition] AS DefaultValue
FROM	sys.all_columns Col
INNER JOIN sys.tables Tab 
		ON Col.object_id = Tab.object_id
INNER JOIN sys.default_constraints Con
		ON Col.default_object_id = Con.object_id
WHERE col.is_nullable = 1
ORDER BY 1,2

Similar to the above, most can be done from INFORMATION_SCHEMA view ins sql 2005 (with the exception of the default name)

SELECT
	 TABLE_SCHEMA AS SchemaName
	,TABLE_NAME AS TableName
	,COLUMN_NAME AS ColumnName
	,IS_NULLABLE
	,COLUMN_DEFAULT AS DefaultValue
FROM INFORMATION_SCHEMA.COLUMNS
WHERE COLUMN_DEFAULT IS NOT NULL
  AND IS_NULLABLE = 'YES'
ORDER BY 1,2,3