Created
October 4, 2018 22:08
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/* | |
Script to identify the oldest partition w/ data and swap it out | |
</code><code> | |
1. identify partition | |
2. script out target table (1 time?) | |
3. ALTER TABLE audit.ServiceUserAction SWITCH PARTITION # TO | |
3. truncate table | |
*/ | |
DECLARE @part_num INT | |
, @sqlcmd VARCHAR(MAX) | |
, @rngValue VARCHAR(50); | |
WHILE EXISTS ( SELECT DISTINCT sp.partition_number | |
, rows | |
, CAST(sprv.value AS DATETIME2) | |
FROM sys.partitions sp | |
INNER JOIN sys.indexes si ON si.index_id = sp.index_id | |
AND si.[object_id] = sp.[object_id] | |
INNER JOIN sys.data_spaces sds ON sds.data_space_id = si.data_space_id | |
INNER JOIN sys.partition_schemes sps ON sps.data_space_id = sds.data_space_id | |
INNER JOIN sys.partition_functions spf ON spf.function_id = sps.function_id | |
/* Join partition range values (RANGE Right means p number - 1 = boundary ID */ | |
LEFT OUTER JOIN sys.partition_range_values sprv ON sprv.function_id = spf.function_id | |
AND sprv.boundary_id = sp.partition_number - 1 | |
WHERE spf.name = N'pf_MonthlyWindow' | |
AND sp.rows > 0 | |
AND CAST(sprv.value AS DATETIME2) < DATEADD(MONTH, -13, GETDATE())) | |
BEGIN | |
SELECT TOP 1 @part_num = sp.partition_number | |
, @rngValue = CONVERT(VARCHAR(30) | |
, CAST(sprv.value AS DATETIME2), 120) | |
FROM sys.partitions sp | |
INNER JOIN sys.indexes si ON si.index_id = sp.index_id | |
AND si.[object_id] = sp.[object_id] | |
INNER JOIN sys.data_spaces sds ON sds.data_space_id = si.data_space_id | |
INNER JOIN sys.partition_schemes sps ON sps.data_space_id = sds.data_space_id | |
INNER JOIN sys.partition_functions spf ON spf.function_id = sps.function_id | |
/* Join partition range values (RANGE Right means p number - 1 = boundary ID */ | |
LEFT OUTER JOIN sys.partition_range_values sprv ON sprv.function_id = spf.function_id | |
AND sprv.boundary_id = sp.partition_number - 1 | |
WHERE spf.name = N'pf_MonthlyWindow' | |
AND sp.rows > 0 | |
AND CAST(sprv.value AS DATETIME2) < DATEADD(MONTH, -13, GETDATE()) -- 1 year was our agreed upon retention date | |
ORDER BY sp.partition_number; | |
SELECT @sqlcmd = 'ALTER TABLE dbo.verybusytable SWITCH PARTITION ' | |
+ CAST(@part_num AS VARCHAR(3)) + ' TO dbo.truncatepartition;'; | |
PRINT @sqlcmd; | |
PRINT 'Merged range value: ' + @rngValue + '.'; | |
EXEC (@sqlcmd); | |
/* kill swapped out records: */ | |
TRUNCATE TABLE dbo.truncatepartition; | |
END; | |
GO |
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