Saturday 20 December 2008

sp_spaceused and other MS SQL Server Dictionary views

Many times I am asked to look at Microsoft SQL Servers to investigate things, and I find the following T-SQL procedures and Microsoft SQL Server dictionary views very handy.

To find out how much disk space you Microsoft SQL Server database consumes and other things, you can run the following T-SQL procedures inside the Query Analyzer.

sp_spaceused @updateusage = 'TRUE'

To see quickly how many stored procedure, views, tables and other objects your database has you can use this query here

See table disk space usage

sp_spaceused 'Tablename'

See all tables

select *

See all foreign key constraints

select *

See foreign keys, primary keys of a particular table


See the foreign key of a particular table.

select table_name, column_name "foreign key", constraint_name
where TABLE_NAME='put_table_name_here'
and constraint_name not like 'PK%'

Find which MS SQL Server Stored procedure is using a particular table, or in other words dependencies between stored procedures and tables.

FROM syscomments sc
INNER JOIN sysobjects so ON
WHERE sc.TEXT LIKE '%put_table_name_here%' -- enter table name here.

For more info go to:

Monday 1 December 2008

Service Level Agreement (SLA) figures

How does downtime affect your Service Level Agreement (SLA) with your customer?

What does 99.99999 % uptime per year mean?

If you want answers to these questions you have too look at the availability levels below. They show how many minutes, seconds downtime/system outage you are allowed to have in a year, to meet certain SLA figures and your contractual obligations.

Level of availability Total downtime per year
===================== ======================
99% 3.6 days
99.9% 8.76 hours
99.99% 52 minutes
99.999% 5 minutes
99.9999% 30 seconds
99.99999% 3 seconds