Database backup file size is too small compare to actual database size


hi all,

i know backup file size can smaller actual db size (i.e., mdf size + ldf size). in case observing huge difference. 

my database size 16 gb out of 10 gb consumed mdf , 6 gb consumed ldf. when took backup, backup file size 1 gb!!!!!

i skeptical whether doing wrong. please advice me.

olaf right must compressed backup:

to check if backup file compressed or not

restore headeronly disk = 'path backup file';

looks column labelled "compressed". 1 = compressed, 0 = not compressed.

if skeptical about backup file can verfiy whether sql database backup can read , restored:

restore verifyonly disk = 'path backup file'

if backup valid, sql server database engine returns:

the backup set on file 1 valid



SQL Server  >  SQL Server Manageability



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