SQL SERVER 2012 COLUMNSTORE INDEX-之一

作为 SQL SERVER 2012 一大卖点的 CLOUMNSTORE INDEX，先来认识一下。

1，支持数据类型：
int, big int, small int, tiny int, money, smallmoney, bit, float, real, char(n), varchar(n), nchar(n), nvarchar(n), date, datetime, datetime2, small datetime, time, datetimeoffset with precision <=2, decimal or numeric with precision <= 18

2，不支持数据类型：
decimal or numeric with precision > 18, datetimeoffset with precision > 2, binary, varbinary, image, text, ntext, varchar(max), nvarchar(max), cursor, hierarchyid, timestamp, uniqueidentifier, sqlvariant, xml.  www.atcpu.com  

3，不可以用于：
INSERT, UPDATE, DELETE, MERGE
需要
[sql]
ALTER INDEX mycolumnstoreindex ON mytable DISABLE;  
  
ALTER INDEX mycolumnstoreindex ON mytable REBUILD;  

4，增加内存：
[sql]
ALTER WORKLOAD GROUP [DEFAULT] WITH (REQUEST_MAX_MEMORY_GRANT_PERCENT=X)  
ALTER RESOURCE GOVERNOR RECONFIGURE  
GO  
  
--where X is the percent, say 50.  
  
5，查询索引大小：
[sql]
-- total size  
  
with total_segment_size as (  
  
    SELECT    
  
        SUM (css.on_disk_size)/1024/1024 AS segment_size_mb  
  
    FROM sys.partitions AS p    
    www.atcpu.com  
    JOIN sys.column_store_segments AS css    
  
        ON p.hobt_id = css.hobt_id  
  
)  
  
,  
  
total_dictionary_size as (  
  
    SELECT SUM (csd.on_disk_size)/1024/1024 AS dictionary_size_mb  
  
    FROM sys.partitions AS p  
  
    JOIN sys.column_store_dictionaries AS csd  
  
        ON p.hobt_id = csd.hobt_id  
  
)  
  
select    
  
    segment_size_mb,    
  
    dictionary_size_mb,  
  
    segment_size_mb + isnull(dictionary_size_mb, 0) as total_size_mb  
  
from total_segment_size    
  
left outer join total_dictionary_size  
  
    on 1 = 1  
  
go  
  
    
  
-- size per index  
  
with segment_size_by_index AS (  
  
SELECT    
  
    p.object_id as table_id,  
  
    p.index_id as index_id,  
  
    SUM (css.on_disk_size)/1024/1024 AS segment_size_mb  
    www.atcpu.com  
FROM sys.partitions AS p    
  
JOIN sys.column_store_segments AS css    
  
    ON p.hobt_id = css.hobt_id  
  
group by p.object_id, p.index_id  
  
) ,  
  
dictionary_size_by_index AS (  
  
SELECT    
  
    p.object_id as table_id,  
  
    p.index_id as index_id,  
  
    SUM (csd.on_disk_size)/1024/1024 AS dictionary_size_mb  
  
FROM sys.partitions AS p    
  
JOIN sys.column_store_dictionaries AS csd    
  
    ON p.hobt_id = csd.hobt_id  
  
group by p.object_id, p.index_id  
  
)  
  
select    
  
    object_name(s.table_id) table_name,  
  
    i.name as index_name,  
  
    s.segment_size_mb,  
  
    d.dictionary_size_mb,  
  
    s.segment_size_mb + isnull(d.dictionary_size_mb, 0) as total_size_mb  
  
from segment_size_by_index s  
  
JOIN sys.indexes AS i  
  
    ON i.object_id = s.table_id  
  
    and i.index_id = s.index_id  
  
left outer join dictionary_size_by_index d  
    www.atcpu.com  
    on s.table_id = s.table_id  
  
    and s.index_id = d.index_id  
  
order by total_size_mb desc  
  
go  
  
    
  
-- size per table  
  
with segment_size_by_table AS (  
  
SELECT    
  
    p.object_id as table_id,  
  
    SUM (css.on_disk_size)/1024/1024 AS segment_size_mb  
  
FROM sys.partitions AS p    
  
JOIN sys.column_store_segments AS css    
  
    ON p.hobt_id = css.hobt_id  
  
group by p.object_id  
  
) ,  
  
dictionary_size_by_table AS (  
  
SELECT    
  
    p.object_id AS table_id,  
  
    SUM (csd.on_disk_size)/1024/1024 AS dictionary_size_mb  
  
FROM sys.partitions AS p  
  
JOIN sys.column_store_dictionaries AS csd  
  
    ON p.hobt_id = csd.hobt_id  
    www.atcpu.com  
group by p.object_id  
  
)  
  
select    
  
    t.name AS table_name,  
  
    s.segment_size_mb,  
  
    d.dictionary_size_mb,  
  
    s.segment_size_mb + isnull(d.dictionary_size_mb, 0) as total_size_mb  
  
from dictionary_size_by_table d  
  
JOIN sys.tables AS t  
  
    ON t.object_id = d.table_id  
  
left outer join segment_size_by_table s  
  
on d.table_id = s.table_id  
  
order by total_size_mb desc  
  
go  
  
    
  
-- size per column  
    www.atcpu.com  
with segment_size_by_column as (  
  
    SELECT    
  
        p.object_id as table_id,  
  
        css.column_id,  
  
        SUM (css.on_disk_size)/1024/1024.0 AS segment_size_mb  
  
    FROM sys.partitions AS p    
  
    JOIN sys.column_store_segments AS css    
  
        ON p.hobt_id = css.hobt_id    
  
    GROUP BY p.object_id, css.column_id  
  
),  
  
dictionary_size_by_column as (  
  
    SELECT    
  
        p.object_id as table_id,  
        www.atcpu.com  
        csd.column_id,  
  
        SUM (csd.on_disk_size)/1024/1024.0 AS dictionary_size_mb  
  
    FROM sys.partitions AS p    
  
    JOIN sys.column_store_dictionaries AS csd    
  
        ON p.hobt_id = csd.hobt_id    
  
    GROUP BY p.object_id, csd.column_id  
  
)  
  
select    
  
    t.name as table_name,    
  
    c.name as column_name,    
  
    s.segment_size_mb,  
    www.atcpu.com  
    d.dictionary_size_mb,  
  
    s.segment_size_mb + isnull(d.dictionary_size_mb, 0) total_size_mb  
  
from segment_size_by_column s  
  
join sys.tables AS t    
  
    ON t.object_id = s.table_id  
  
join sys.columns AS c  
  
    ON c.object_id = s.table_id  
  
    and c.column_id = s.column_id  
  
left outer join dictionary_size_by_column d  
    www.atcpu.com  
    on s.table_id = d.table_id  
  
    and s.column_id = d.column_id  
  
order by total_size_mb desc  
  
go