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POWhere's the rest of the space used in this table?
 

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  1. POWhere's the rest of the space used in this table?
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    <p>I'm using SQL Server 2005.</p> <p>I have a table whose row size should be 124 bytes. It's all ints or floats, no NULL columns (so everything is fixed width).</p> <p>There is only one index, clustered. The fill factor is 0.</p> <p>Here's the table def:</p> <pre><code>create table OHLC_Bar_Trl ( obt_obh_id int NOT NULL REFERENCES OHLC_Bar_Hdr (obh_id), obt_bar_start_ms int NOT NULL, obt_bar_end_ms int NOT NULL, obt_last_price float NOT NULL, obt_last_ms int NOT NULL, obt_bid_price float NOT NULL, obt_bid_size int NOT NULL, obt_bid_ms int NOT NULL, obt_bid_pexch_price float NOT NULL, obt_ask_price float NOT NULL, obt_ask_size int NOT NULL, obt_ask_ms int NOT NULL, obt_ask_pexch_price float NOT NULL, obt_open_price float NOT NULL, obt_open_ms INT NOT NULL, obt_high_price float NOT NULL, obt_high_ms INT NOT NULL, obt_low_price float NOT NULL, obt_low_ms INT NOT NULL, obt_volume float NOT NULL, obt_vwap float NOT NULL ) go create unique clustered index idx on OHLC_Bar_Trl (obt_obh_id,obt_bar_end_ms) </code></pre> <p>After inserting a ton of data, sp_spaceused returns the following</p> <pre><code>name rows reserved data index_size unused OHLC_Bar_Trl 117076054 29807664 KB 29711624 KB 92344 KB 3696 KB </code></pre> <p>which shows a rowsize of approx (29807664*1024)/117076054 = 260 bytes/row.</p> <p>Where's the rest of the space?</p> <p>Is there some DBCC command I need to run to tighten up this table (I could not insert the rows in correct index order, so maybe it's just internal fragmentation)?</p>
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    1. This table or related slice is empty.
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    1. USEric H.
    1. USEric H.
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POWhere's the rest of the space used in this table?
      1. USShaji
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    1. COThis would be easier to answer if you showed the actual columns and keys (for example, is your clustered index on a unique single-column primary key?)
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      1. POWhere's the rest of the space used in this table?
      1. USAaronaught
    2. COadded the table def.....
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      1. POWhere's the rest of the space used in this table?
      1. USEric H.
 

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