Comments on: SQL SERVER – 2008 – Introduction to Row Compression

By: SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Day 17 of 31 Journey to SQLAuthority

Sun, 17 Jul 2011 01:32:17 +0000

[...] Row compression changes the format of physical storage of data. It minimize the metadata (column information, length, offsets etc) associated with each record. Numeric data types and fixed-length strings are stored in variable-length storage format, just like Varchar. (Read more here) [...]

By: Ananthesh kv

Ananthesh kv — Sun, 10 Apr 2011 15:28:41 +0000

–display all the compressed tables

select a.name,b.data_compression_desc from sys.partitions b
inner join sys.tables a on
a.object_id = b.object_id where data_compression 0

select a.name,b.data_compression_desc from sys.partitions b
inner join sys.tables a on
a.object_id = b.object_id where data_compression_desc ‘NONE’

please u can check.

Ananthesh

By: Inna Shapiro

Inna Shapiro — Thu, 07 Apr 2011 06:49:53 +0000

Please tell how can i get a list of compressed tables in the database ?

Thank you in advance

By: ananthesh

ananthesh — Fri, 22 Oct 2010 10:47:29 +0000

Dear Pinal

After the row or page compression I/O performance will increase but what about the cpu performance. How to decide on page or row compression which should not affect the cpu performance much.
Please provide any article on deciding the row and page compression selection which show I/O and cpu performance statistics also.

By: SQL SERVER – Fastest Way to Restore the Database Journey to SQL Authority with Pinal Dave

Wed, 09 Jun 2010 01:31:35 +0000

[...] SQL SERVER – 2008 – Introduction to Row Compression [...]

By: Pinal Dave

Pinal Dave — Sun, 13 Dec 2009 18:28:37 +0000

Hi Ashish,

The comprassion can be enabled to new tables/nex as well as to existing table/index. The syntax to enable the comprassion is follwoing.

CREATE TABLE TableName
(
column defination,….
)
WITH (DATA_COMPRESSION = ROW|PAGE|NONE)

CREATE INDEX IndexName ON TableName (column,…) WITH (DATA_COMPRESSION = ROW|PAGE|NONE)

ALTER TABLE TableName REBUILD WITH (DATA_COMPRESSION=ROW|PAGE|NONE)

ALTER INDEX IndexName REBUILD
WITH (DATA_COMPRESSION=ROW|PAGE|NONE)

Please let us know what is the error you are getting.

Kind Regards,
Pinal Dave

By: Ashish kumar arora

Ashish kumar arora — Sat, 12 Dec 2009 10:26:37 +0000

please send me querry to execute an dapply row compression. I am not able to apply above querry properly
kindly send me proper syntex and method to compress it

By: Uday Chowdary

Uday Chowdary — Tue, 09 Jun 2009 07:04:48 +0000

Sir
It is really helpful for me. I have gone through all of sql server 2008 interview questions. The way you are explaining is really excellent. Please publish more questions.

By: bhavani

bhavani — Thu, 08 Jan 2009 05:42:05 +0000

i want indetail about the Dirrential backup.

but i don’t know how to use that.

i am daily getting the full backup but it takes so much of time.

Please Consider this sir,

By: bhavani

bhavani — Thu, 08 Jan 2009 05:38:09 +0000

Thanks Sir,

its very good.

By: SQL SERVER - 2008 - Interview Questions and Answers - Part 8 Journey to SQL Authority with Pinal Dave

Fri, 19 Sep 2008 01:30:16 +0000

[...] Row compression changes the format of physical storage of data. It minimize the metadata (column information, length, offsets etc) associated with each record. Numeric data types and fixed length strings are stored in variable-length storage format, just like Varchar. (Read More Here) [...]

By: Matt

Matt — Thu, 10 Jul 2008 18:57:53 +0000

Very interesting

By: Nicholas Paldino [.NET/C# MVP]

Nicholas Paldino [.NET/C# MVP] — Tue, 08 Jul 2008 19:22:53 +0000

Is there a performance difference when using row compression? Surely there are space savings, but you never get something for nothing. I imagine there is a small computational cost that is attached to these storage savings.