Bạn nên nhìn vào việc xây dựng nhiều chỉ mục hơn. Tôi nghĩ rằng nói chung, hầu hết mọi người đánh giá thấp cơ sở dữ liệu của họ.
Đây vẫn là mã không khí, tôi chưa thử nghiệm đầy đủ, nhưng nó sẽ giúp bạn đi đúng hướng
http://accessadp.com/2011/08/22/missing-indexes-great-script-for-determining-roi/
Select ‘create index IX_’ +
sys.objects.name +
isnull(replace(‘_’ + equality_columns, ‘,’, ‘_’), ”) +
isnull(replace(‘_’ + inequality_columns, ‘,’, ‘_’), ”) + ‘ on ‘ +
sys.objects.name +
‘(‘ +
coalesce(equality_columns + ‘,’ + inequality_columns, equality_columns , inequality_columns ) +
‘) ‘ +
isnull(‘ include (‘ + included_columns + ‘)’, ”)
as CreateIndexSql,
(CONVERT(Numeric(19,6), sys.dm_db_missing_index_group_stats.user_seeks)+CONVERT(Numeric(19,6), sys.dm_db_missing_index_group_stats.unique_compiles))*CONVERT(Numeric(19,6), sys.dm_db_missing_index_group_stats.avg_total_user_cost)*CONVERT(Numeric(19,6), sys.dm_db_missing_index_group_stats.avg_user_impact/100.0) AS Score,
sys.schemas.schema_id,
sys.schemas.name AS schema_name,
sys.objects.object_id,
sys.objects.name AS object_name,
sys.objects.type,
partitions.Rows, partitions.SizeMB,
sys.dm_db_missing_index_details.equality_columns,
sys.dm_db_missing_index_details.inequality_columns,
sys.dm_db_missing_index_details.included_columns,
sys.dm_db_missing_index_group_stats.unique_compiles,
sys.dm_db_missing_index_group_stats.user_seeks, sys.dm_db_missing_index_group_stats.user_scans,
sys.dm_db_missing_index_group_stats.avg_total_user_cost, sys.dm_db_missing_index_group_stats.avg_user_impact,
sys.dm_db_missing_index_group_stats.last_user_seek, sys.dm_db_missing_index_group_stats.last_user_scan,
sys.dm_db_missing_index_group_stats.system_seeks, sys.dm_db_missing_index_group_stats.system_scans,
sys.dm_db_missing_index_group_stats.avg_total_system_cost, sys.dm_db_missing_index_group_stats.avg_system_impact,
sys.dm_db_missing_index_group_stats.last_system_seek, sys.dm_db_missing_index_group_stats.last_system_scan
FROM
sys.objects
JOIN (
SELECT
object_id, SUM(CASE WHEN index_id BETWEEN 0 AND 1 THEN row_count ELSE 0 END) AS Rows,
CONVERT(numeric(19,3), CONVERT(numeric(19,3), SUM(in_row_reserved_page_count+lob_reserved_page_count+row_overflow_reserved_page_count))/CONVERT(numeric(19,3), 128)) AS SizeMB
FROM sys.dm_db_partition_stats
WHERE sys.dm_db_partition_stats.index_id BETWEEN 0 AND 1 –0=Heap; 1=Clustered; only 1 per table
GROUP BY object_id
) AS partitions ON sys.objects.object_id=partitions.object_id
JOIN sys.schemas ON sys.objects.schema_id=sys.schemas.schema_id
JOIN sys.dm_db_missing_index_details ON sys.objects.object_id=sys.dm_db_missing_index_details.object_id
JOIN sys.dm_db_missing_index_groups ON sys.dm_db_missing_index_details.index_handle=sys.dm_db_missing_index_groups.index_handle
JOIN sys.dm_db_missing_index_group_stats ON sys.dm_db_missing_index_groups.index_group_handle=sys.dm_db_missing_index_group_stats.group_handle
WHERE
sys.dm_db_missing_index_details.database_id=DB_ID()
AND (CONVERT(Numeric(19,6), sys.dm_db_missing_index_group_stats.user_seeks)+CONVERT(Numeric(19,6), sys.dm_db_missing_index_group_stats.unique_compiles))*CONVERT(Numeric(19,6), sys.dm_db_missing_index_group_stats.avg_total_user_cost)*CONVERT(Numeric(19,6), sys.dm_db_missing_index_group_stats.avg_user_impact/100.0) > 100