SQL Server - Extremely low avg_page_space_used_in_percent for heap table
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While analyzing a SQL Server 2012 database bloat issue, I found that fragmentation might be a major contributor to how much space is being taken up by certain tables, so after some Googling, I'm looking into the sys.dm_db_index_physical_stats function to try to understand what's going on. Here's my query:
SELECT
index_id,
index_type_desc,
alloc_unit_type_desc,
avg_fragmentation_in_percent,
avg_page_space_used_in_percent,
record_count,
page_count,
min_record_size_in_bytes,
max_record_size_in_bytes,
avg_record_size_in_bytes
FROM sys.dm_db_index_physical_stats
(DB_ID(), NULL, NULL, NULL , 'SAMPLED')
WHERE OBJECT_ID = 516196889
ORDER BY avg_fragmentation_in_percent DESC;
And my results:
There are 4 non-clustered indexes on the table, so I'm guessing those are what the top 4 result rows represent. I haven't figured out why the IN_ROW_DATA portion of the heap has such low page usage (6%). If I'm reading the results correctly, there are more pages for this part than there are rows, but max record size is less than 8kb, so I'm trying to understand how that's even possible. How do I find out what's causing this low page usage, and what are some things I can do to fix it?
Any help greatly appreciated!
sql-server sql-server-2012
asked 4 mins ago
user3250365user3250365
1
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While analyzing a SQL Server 2012 database bloat issue, I found that fragmentation might be a major contributor to how much space is being taken up by certain tables, so after some Googling, I'm looking into the sys.dm_db_index_physical_stats function to try to understand what's going on. Here's my query:
SELECT
index_id,
index_type_desc,
alloc_unit_type_desc,
avg_fragmentation_in_percent,
avg_page_space_used_in_percent,
record_count,
page_count,
min_record_size_in_bytes,
max_record_size_in_bytes,
avg_record_size_in_bytes
FROM sys.dm_db_index_physical_stats
(DB_ID(), NULL, NULL, NULL , 'SAMPLED')
WHERE OBJECT_ID = 516196889
ORDER BY avg_fragmentation_in_percent DESC;
And my results:
There are 4 non-clustered indexes on the table, so I'm guessing those are what the top 4 result rows represent. I haven't figured out why the IN_ROW_DATA portion of the heap has such low page usage (6%). If I'm reading the results correctly, there are more pages for this part than there are rows, but max record size is less than 8kb, so I'm trying to understand how that's even possible. How do I find out what's causing this low page usage, and what are some things I can do to fix it?
Any help greatly appreciated!
sql-server sql-server-2012
asked 4 mins ago
user3250365user3250365
1
New contributor
user3250365 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
While analyzing a SQL Server 2012 database bloat issue, I found that fragmentation might be a major contributor to how much space is being taken up by certain tables, so after some Googling, I'm looking into the sys.dm_db_index_physical_stats function to try to understand what's going on. Here's my query:
SELECT
index_id,
index_type_desc,
alloc_unit_type_desc,
avg_fragmentation_in_percent,
avg_page_space_used_in_percent,
record_count,
page_count,
min_record_size_in_bytes,
max_record_size_in_bytes,
avg_record_size_in_bytes
FROM sys.dm_db_index_physical_stats
(DB_ID(), NULL, NULL, NULL , 'SAMPLED')
WHERE OBJECT_ID = 516196889
ORDER BY avg_fragmentation_in_percent DESC;
And my results:
There are 4 non-clustered indexes on the table, so I'm guessing those are what the top 4 result rows represent. I haven't figured out why the IN_ROW_DATA portion of the heap has such low page usage (6%). If I'm reading the results correctly, there are more pages for this part than there are rows, but max record size is less than 8kb, so I'm trying to understand how that's even possible. How do I find out what's causing this low page usage, and what are some things I can do to fix it?
Any help greatly appreciated!
sql-server sql-server-2012
asked 4 mins ago
user3250365user3250365
1
New contributor
user3250365 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
While analyzing a SQL Server 2012 database bloat issue, I found that fragmentation might be a major contributor to how much space is being taken up by certain tables, so after some Googling, I'm looking into the sys.dm_db_index_physical_stats function to try to understand what's going on. Here's my query:
SELECT
index_id,
index_type_desc,
alloc_unit_type_desc,
avg_fragmentation_in_percent,
avg_page_space_used_in_percent,
record_count,
page_count,
min_record_size_in_bytes,
max_record_size_in_bytes,
avg_record_size_in_bytes
FROM sys.dm_db_index_physical_stats
(DB_ID(), NULL, NULL, NULL , 'SAMPLED')
WHERE OBJECT_ID = 516196889
ORDER BY avg_fragmentation_in_percent DESC;
And my results:
There are 4 non-clustered indexes on the table, so I'm guessing those are what the top 4 result rows represent. I haven't figured out why the IN_ROW_DATA portion of the heap has such low page usage (6%). If I'm reading the results correctly, there are more pages for this part than there are rows, but max record size is less than 8kb, so I'm trying to understand how that's even possible. How do I find out what's causing this low page usage, and what are some things I can do to fix it?
Any help greatly appreciated!
sql-server sql-server-2012
sql-server sql-server-2012
asked 4 mins ago
user3250365user3250365
1
New contributor
user3250365 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 mins ago
user3250365user3250365
1
New contributor
user3250365 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 mins ago
user3250365user3250365
1
New contributor
user3250365 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 mins ago
user3250365user3250365
1
asked 4 mins ago
user3250365user3250365
1
1
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user3250365 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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user3250365 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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