Calculating total “on row” bytes for each row … the easy waySQL Database size doesn't match with the...
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Calculating total “on row” bytes for each row … the easy way
SQL Database size doesn't match with the total table sizes in the databaseDo you know an easy way to generate one record for each hour of the past 12 hours?Calculate number for each rowRunning total to the previous rowChoosing the right storage block size for sql serverCalculating Running Total After ResetSQL Server 2016 Maximum Bytes/RowWhat's the best way to iterate through the table to update a column in each row?sql server getting total for each groupSQL Server chooses Nested Loop join with dimensional table and make seek for each row
We want to calculate the total "on row" storage bytes for each row in the table. As we understand it, we must add up the DATALENGTH() of each column while also accounting for NULLs and things like VARCHAR(MAX) which only have a 24-byte pointer "on row". We are aware there is also some overhead for each row which is not accounted for in the query below.
SELECT ROW_ID,
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL1','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL1), 1)
END
+
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL2','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL2), 1)
END
+
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL3','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL3), 1)
END
+
...
...
AS ROW_SIZE
FROM EXAMPLE_TABLE
ORDER BY ROW_SIZE DESC
;
What a beast! And it's only an approximation.
Then we discovered
DBCC SHOWCONTIG ('EXAMPLE_TABLE') WITH TABLERESULTS
which returns MaximumRecordSize. This reveals that there is already an algorithm buried somewhere within SQL Server which is capable of calculating the exact size of a row.
How can we access that algorithm directly?
sql-server sql-server-2017 storage dbcc size
asked 3 mins ago
UnLogicGuysUnLogicGuys
15718
add a comment |
We want to calculate the total "on row" storage bytes for each row in the table. As we understand it, we must add up the DATALENGTH() of each column while also accounting for NULLs and things like VARCHAR(MAX) which only have a 24-byte pointer "on row". We are aware there is also some overhead for each row which is not accounted for in the query below.
SELECT ROW_ID,
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL1','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL1), 1)
END
+
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL2','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL2), 1)
END
+
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL3','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL3), 1)
END
+
...
...
AS ROW_SIZE
FROM EXAMPLE_TABLE
ORDER BY ROW_SIZE DESC
;
What a beast! And it's only an approximation.
Then we discovered
DBCC SHOWCONTIG ('EXAMPLE_TABLE') WITH TABLERESULTS
which returns MaximumRecordSize. This reveals that there is already an algorithm buried somewhere within SQL Server which is capable of calculating the exact size of a row.
How can we access that algorithm directly?
sql-server sql-server-2017 storage dbcc size
asked 3 mins ago
UnLogicGuysUnLogicGuys
15718
add a comment |
We want to calculate the total "on row" storage bytes for each row in the table. As we understand it, we must add up the DATALENGTH() of each column while also accounting for NULLs and things like VARCHAR(MAX) which only have a 24-byte pointer "on row". We are aware there is also some overhead for each row which is not accounted for in the query below.
SELECT ROW_ID,
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL1','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL1), 1)
END
+
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL2','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL2), 1)
END
+
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL3','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL3), 1)
END
+
...
...
AS ROW_SIZE
FROM EXAMPLE_TABLE
ORDER BY ROW_SIZE DESC
;
What a beast! And it's only an approximation.
Then we discovered
DBCC SHOWCONTIG ('EXAMPLE_TABLE') WITH TABLERESULTS
which returns MaximumRecordSize. This reveals that there is already an algorithm buried somewhere within SQL Server which is capable of calculating the exact size of a row.
How can we access that algorithm directly?
sql-server sql-server-2017 storage dbcc size
asked 3 mins ago
UnLogicGuysUnLogicGuys
15718
We want to calculate the total "on row" storage bytes for each row in the table. As we understand it, we must add up the DATALENGTH() of each column while also accounting for NULLs and things like VARCHAR(MAX) which only have a 24-byte pointer "on row". We are aware there is also some overhead for each row which is not accounted for in the query below.
SELECT ROW_ID,
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL1','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL1), 1)
END
+
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL2','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL2), 1)
END
+
CASE
WHEN COLUMNPROPERTY(OBJECT_ID('EXAMPLE_TABLE'),'COL3','PRECISION') = -1 THEN 24
ELSE ISNULL(DATALENGTH(COL3), 1)
END
+
...
...
AS ROW_SIZE
FROM EXAMPLE_TABLE
ORDER BY ROW_SIZE DESC
;
What a beast! And it's only an approximation.
Then we discovered
DBCC SHOWCONTIG ('EXAMPLE_TABLE') WITH TABLERESULTS
which returns MaximumRecordSize. This reveals that there is already an algorithm buried somewhere within SQL Server which is capable of calculating the exact size of a row.
How can we access that algorithm directly?
sql-server sql-server-2017 storage dbcc size
sql-server sql-server-2017 storage dbcc size
asked 3 mins ago
UnLogicGuysUnLogicGuys
15718
asked 3 mins ago
UnLogicGuysUnLogicGuys
15718
asked 3 mins ago
UnLogicGuysUnLogicGuys
15718
asked 3 mins ago
UnLogicGuysUnLogicGuys
15718
asked 3 mins ago
UnLogicGuysUnLogicGuys
15718
15718
add a comment |
add a comment |
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