💡 Today I Learned

Find (and fix) large tables

Some tables too big? Running out of space in your database?

Easy to find:

SELECT top 50
    t.NAME AS TableName,
    s.Name AS SchemaName,
    p.rows AS RowCounts,
    (SUM(a.total_pages) * 8)/1024 AS TotalSpaceMB,
    (SUM(a.used_pages) * 8)/1024 AS UsedSpaceMB,
    ((SUM(a.total_pages) - SUM(a.used_pages)) * 8/1024) AS UnusedSpaceMB,
    case when p.rows > 0 then ((SUM(a.used_pages)*8000 ) / p.rows) else 0 end as bytes_per_row
FROM
    sys.tables t
INNER JOIN
    sys.indexes i ON t.OBJECT_ID = i.object_id
INNER JOIN
    sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id
INNER JOIN
    sys.allocation_units a ON p.partition_id = a.container_id
LEFT OUTER JOIN
    sys.schemas s ON t.schema_id = s.schema_id
WHERE
    t.NAME NOT LIKE 'dt%'
    AND t.is_ms_shipped = 0
    AND i.OBJECT_ID > 255
GROUP BY
    t.Name, s.Name, p.Rows
ORDER BY
    4 desc, 5 desc

(There's also some built in reports... but a query is the best UI)

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