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SQL Server Stored Procedure to Compress Tables
Dharmesh Singh
Aug 10
2016
Code
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CREATE
PROCEDURE
dbo.usp_CompressNonPartitionedTables (
@compression_mode
VARCHAR
(10),
@
schema
VARCHAR
(30),
@size_thresholdKB
INT
)
AS
BEGIN
set
nocount
on
DECLARE
@tsql
VARCHAR
(200)
DECLARE
@tablename
VARCHAR
(60)
DECLARE
@expectedSavingKB
BIGINT
DECLARE
cur
CURSOR
FOR
(
SELECT
DISTINCT
t.
NAME
AS
table_name
FROM
sys.partitions p ,sys.tables t ,sys.schemas s
WHERE
p.object_id = t.object_id
AND
p.partition_number = 1
AND
t.schema_id = s.schema_id
AND
s.
NAME
= @
schema
AND
p.data_compression = 0);
-- Create results table
CREATE
TABLE
#estimated_savings (
[object_name] SYSNAME
,[schema_name] SYSNAME
,[index_id]
INT
,[partition_number]
INT
,[size_with_current_compression_settingKB]
BIGINT
,[size_with_requested_compression_settingKB]
BIGINT
,[sample_size_with_current_compression_settingKB]
BIGINT
,[sample_size_with_requested_compression_settingKB]
BIGINT
);
OPEN
cur
FETCH
NEXT
FROM
cur
INTO
@tablename
WHILE @@FETCH_STATUS = 0
BEGIN
INSERT
INTO
#estimated_savings
EXECUTE
sp_estimate_data_compression_savings @schema_name = @
schema
,@object_name = @tablename
,@index_id =
NULL
,@partition_number =
NULL
,@data_compression = @compression_mode;
SELECT
@expectedSavingKB = ([size_with_current_compression_settingKB] -
[size_with_requested_compression_settingKB])
FROM
#estimated_savings
IF (@expectedSavingKB > @size_thresholdKB)
BEGIN
SET
@tsql =
'ALTER TABLE '
+ @
schema
+
'.['
+ @tableName +
']'
+
' rebuild WITH( DATA_COMPRESSION = '
+ @compression_mode +
' )'
EXEC
(@tsql)
END
TRUNCATE
TABLE
#estimated_savings
FETCH
NEXT
FROM
cur
INTO
@tablename
END
CLOSE
cur
DEALLOCATE
cur
DROP
TABLE
#estimated_savings
set
nocount
off
END
GO
SQL Server Compress Tables
Compress Tables