Impact Of Empty Tables On Database Size And Performance
Jun 21, 2007
Hello All,
When creating my database I have modeled some of the tables after the Adventureworks sample database.
There are some fields or entire tables in Adventureworks that I do not see an imediate use for, however; I would hate to ommit them to find out later they would have been benificial. (.eg territory table).
In general terms what would the impact be on size and performance of a database which contains tables or fields that do not contain data.
Thanks for your help!
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May 3, 2013
I have an MS SQL database that appears to have all the data in it but when I do a check on the tables they are all "0 Mb". How can this be? Is my table data being hidden?
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Jan 18, 2001
I want to determine the performance impact caused by the extensive use of the 'select into #' statement in a production environment. The current situation is that our reports team extensively uses the 'select into #' statement to build smaller subsets of data. These subsets are then used as the basis to create summary style reports and exports. All this is accomplished via the use of SQL pass-through.
After these reports/exports are completed and tested, they are then released to our operations department and the users. The reports/exports then can be run against the production server at the discretion of the user, provided they have the appropriate permissions. These reports/exports target the live data on the primary production server that already has been designated for the use of the application software.
Now I know that reporting against a transactional-based server, where the users run the application, is not a very good idea. (Inherited) I am currently migrating all reports/exports to a reporting server. Although it will still be transaction-based, the reports/exports will be isolated from user activity. Eventually we will be moving toward a warehouse scenario.
I also know that the extensive use of the 'select into #' statement is not a coding practice for use in production. I provided several alternatives to this practice
1) insert..select 2) insert..execute - from stored procedure
I have read that in the in sql 6.5 that this may cause severe performance and locking behaviors in system db's and tempdb. However, in the following document on the Microsoft Knowledge Base, it indicates that SQL 7.0 may have corrected this issue.
Q153441 - FIX SELECT INTO Locking Behavior.htm
Despite the indication of being corrected, I am still not convinced. I am frequently seeing drastic performance hits, especially when several of the reports are running. (which is very common) My concern is that moving these reports/exports to a reporting server may save the users; I believe that it may be migrating the problem to another location. I will be working with the developers to optimize their code and will investigate index issues.
** To make a long story short. I would like someone who has experience with this provide me with the top 5+ reasons not to use the 'select into #' methodology in a production environment. Further, if anyone has any documentation, I would surely like the info.
Thanks, Dave
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Jan 4, 2005
Thanks to all participants.
I am using SQL Server 2000 with replication object for two location. Log size on publisher go upto 25 times of data file size, I mean 80 MB Data files has maintains 2 GB log file and it is same for all five co's working on same windows 2000 advanced server board.
Since last week server randamly get disconnected from user applications and at that time few tables are not openable at server.
Can any one give a reason ? Why this type misbehaviou done by SQL Server 2000?
Thanks.
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Jul 13, 2007
I have a question regarding FUll and differential backup.
We we take full or diff back up, does it create lot of logs ie. Does full or diff backup has any impact on log size?
Thanks
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Feb 19, 2004
Hi,
Anybody have any idea howmuch % of performance will be affect if we are using varchar instead of char data type?.
Thanks,
Ravi
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Apr 18, 2008
I have been collecting information about 20 performance counters (memory, IO, cpu, SQL) that refresh every 15 seconds, would that have any performance hit in the server? what are best practices when collecting information via performance counters?
Thanks
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Jan 15, 2008
I want to use "on delete cascade" in one of my tables but I'm worried though whether this can affect the performance when having millions of records. To explain more I'm working on a social networking website and I have two tables UserAccounts, in which I only keep the username and password and a few related fields, and Profiles in which I keep the profile data for users, I want to be sure that I won't have any records in the Profiles table without corresponding records in the UserAccounts table. Please see the DDL below to understand more the structure of the tables:
CREATE TABLE UserAccounts
(
UserID INT NOT NULL IDENTITY(1,1) PRIMARY KEY,
UserName VARCHAR(20) NOT NULL,
Password VARCHAR(20) NOT NULL,
--other fields (e.g. last login .. etc)
)
CREATE TABLE Profiles
(
UserID INT NOT NULL REFERENCES UserAccount(UserID),
-- other fields (e.g. birthdate, nationality .. etc)
)
Any suggestions are highly appreciated...
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Apr 16, 2003
What causes SQL Server 2000 to create tables with default column sizes of 8000 for a varchar datatype??
I would assume this can cause significant performance problems.
(see attached)
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Jul 27, 2015
For example in a Select Statement we have many tables and we have Where Clause with many conditions with AND operations. Do the SQL SERVER would apply the Where clause after all fetch or can dynamically decide about to include the related Tables from Select Statement Orderly with respect to where clause predicates? (SQL SERVER would not fetch data of those tables for its Select, where the AND condition in Where clause fails or by logic would be fruitless/not-related.)
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Apr 2, 2006
Hello I have 16000 tables in a sql database and I need a sql query command to delete empty tables from that sql database please help.
F16 LĂ?GHTĂ?NĂ?NNNG
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Jul 20, 2006
Hi all,
I have a database which gets its daily feed from a ftp file. Now is there any way i can figure out the empty tables in the databese which doesnot get any data on the feed.
Thanks in advance,
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Nov 14, 2011
I would like to know the impacts (if any) of adding nonclustered index with included columns on large tables (these tables are populated by bulk insert from text files).
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Nov 4, 2003
The following procedure will display the size of all the user tables in a database.
CREATE proc sp_tablesize
as
if exists (select * from sysobjects where name = 'sp_tablesize')
begin
goto calculate_tablesize
end
else
begin
CREATE TABLE #SpaceUsed
(
TableName sysname,
TableRows int,
TableSize varchar(10),
DataSpaceUsed varchar(10),
IndexSpaceUsed varchar(10),
UnusedSpace varchar(10)
)
goto calculate_tablesize
end
calculate_tablesize:
declare @tablename nvarchar(50)
declare @cmd nvarchar(50)
declare c1 cursor for select name from sysobjects where xtype='u'
open c1
fetch c1 into @tablename
while @@fetch_status = 0
begin
set @cmd='exec sp_spaceused['+@tablename+']'
insert into #SpaceUsed exec sp_executesql @cmd
fetch next from c1 into @tablename
end
select * from #SpaceUsed
drop table #SpaceUsed
deallocate c1
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Jun 26, 2007
Hi
I am trying to check the size of each table in my database?
SELECT <TableName> , 'Size in bytes/megabytes' FROM DATABASE
I can't for the lif of me figure out how this is done.
Any help would be greatly appreciated
Kind Regards
Carel Greaves
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Nov 17, 2014
I have 57 tables, 7 views and 1 stored procedure. Just wanted know based on these requirements how can I find the size of the database. Though the DB contains lots of tables, views and procedures. I am moving these details to new DB server. So I need to put right requirements.
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Jul 12, 2007
I have a Db that is 1.7 gigs. The table data takes approximately 200megs. The transaction logs were truncated. Where else can this large size be coming from and how can I confirm?
DB is generally small. ~25 tables, 100 SPs, 10 views, etc.
Note:
I have 4 queues using SQL Notifications, but when selecting from them results in no data.
Thanks
Scott
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Nov 16, 2015
I need to build a query to calculate the size of all tables in a database ...
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Jan 22, 2004
I have seen a bunch of ways to get the size of all the tables within a database posted on this board. I decided to modify an older one I found here (http://www.sqlteam.com/item.asp?ItemID=282). I set it up so there is no cursors or temp tables. Pretty much just one select statement to return all the info you would need. It seems to be faster than anything I have seen so far. Take it for whats its worth. Thanks to the original creator.
/*
Original by: Bill Graziano (SQLTeam.com)
Modified by: Eric Stephani (www.mio.uwosh.edu/stephe40)
*/
declare @low int
select @low = low from
master.dbo.spt_values
where number = 1 and type = 'E'
select o.id, o.name, ro.rowcnt, (r.reserved * @low)/1024 as reserved,
(d.data * @low)/1024 as data, ((i.used-d.data) * @low)/1024 as indexp,
((r.reserved-d.data-(i.used-d.data)) * @low)/1024 as unused
from
sysobjects o
inner join
(select distinct id, rowcnt
from sysindexes
where keys is not null and first != 0) ro on o.id = ro.id
inner join
(select id, sum(reserved) reserved
from sysindexes
where indid in (0, 1, 255)
group by id) r on o.id = r.id
inner join
(select c.id, dpages+isnull(used, 0) data from
(select id, sum(dpages) dpages
from sysindexes
where indid < 2
group by id) c full outer join
(select id, isnull(sum(used), 0) used
from sysindexes
where indid = 255
group by id) t on c.id = t.id) d on r.id = d.id
inner join
(select id, sum(used) used
from sysindexes
where indid in (0, 1, 255)
group by id) i on d.id = i.id
where o.xtype = 'U'
order by reserved desc
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Oct 15, 2015
I have a database consisting of two main tables and 12 sub tables.
This was leading to increase in database size. So we thought of storing the sub tables data in the main tables in form of xml  in a column of varchar(2000) type.
So we created a new database that only had 2 tables and we stored the data of the sub tables in the new column of the main table.
Surprisingly we saw that the database size increased rather than decreasing .
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May 23, 2008
We have more than 2000 tables in the database. Can existence of so many tables affect the performance on SQL SERVER 2005?
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Jul 20, 2005
We have a SQLSERVER database that is replicated to many users.We are currently in an expansion phase where we need to make changesto the server database. Each time we rollout a new release, we aredeleting the local replicating database and recreating.Is there any way to automatically transfer the changes from the serverto existing local database without deleting?
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Apr 30, 2007
I am replicating an 80GB database between NY can CT and would like toknow why table sizes are different between the two.Here is an example of sp_spaceused::NY IOI_2007_04_23 rows(279,664) reserved(464,832)data(439,960) index_size(24,624)CT IOI_2007_04_23 rows(279,666) reserved(542,232)data(493,232) index_size(48,784)Thanks,
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Dec 4, 2014
I found it pretty interesting. I checked the size of a database, before implementing database compression across all the user tables in a database. And Post implementation of compression too I checked the size of the database.
I did not find any difference. But if I expand the table and check propetires->storage and I can see that PAGE compression is implemented across all the tables, but no compaction in the size of the db. It still remains the same.
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Aug 5, 2015
Our SQL Server 2008 r2 has collation Latin general.
And my database 'DB1' , 'DB2' has collation set to Japanese unicode.
My sql team has informed they cannot change system collation as it hosts other db's as well.
My Query: What will be the impact of changing collation from JP to Latin.
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Feb 20, 2007
System Configuration :
OS : Windows 2003 latest SP
SQL Server : Standard Edition, SP2
Microsoft SQL Server 2005 - 9.00.3042.00 (Intel X86)
Feb 9 2007 22:47:07
Copyright (c) 1988-2005 Microsoft Corporation
Standard Edition on Windows NT 5.2 (Build 3790: Service Pack 1)
DownTime : This is not a 24x7 kind of machine. It can have downtime
Reference : http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1198044&SiteID=1
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1026884&SiteID=1
I have been discussing this Service Broker issues in this forum for quite sometimes and sorry to bother u all again€¦ To make things more clearer before implementing in production environment I have few doubts and it should be clarified..
As discussed in the first link we can clear sys.conversation_endpoints by just giving ALTER DATABASE GPx SET NEW_BROKER WITH ROLLBACK IMMEDIATE. But my apprehension is that if we run this command on production server and it truncate this table€¦ what will be the impact and overall overhead on the system€¦ Is it recommended to give this statement on Production Server daily at less traffic times, to clear this table ?€¦ will it have adverse effect. I repeat I have downtime , I can even shutdown this server daily€¦
I also, just want to know why Microsoft has not looked into this aspects€¦ why the system itself is clearing the expired messages.. What is the thought behind this architecture
I have the script to run in batch€¦ but in high-level meetings it is always difficult to convince this architecture/process€¦
Thanks in advance
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Aug 28, 2006
I noticed that a database I am working with has a compatibility level set to SQL Server 2000. The instance is actually SQL Server 2005. I'm guessing that it was created like this because the database originally existed on 2000 and was created via backup/restore.
I'm trying to figure out if this needs to be changed and if so how to go about making the change in a non-disruptive manner. What features of 2005 are turned off as a reult of having a 2000 compatibility level?
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Feb 11, 2005
Am I right in assuming that when I have a column where all fields contain NULL, this does not increase the total data storage size if my database? Also, what kind of impact would it have on performance?
And what if I inserted "" in varchar columns? I would think the increase in size would be marginal?
The reason I'm asking is that I want to use an existing table and stored procedures for another purpose, but only need half of the columns. But it would significantly simplify application development.
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Apr 26, 2015
We have 3 maintenance jobs configured in this particular DB instance:
Daily backup of system database - SubPlan1 (Check Database Integrity Task --> Rebuild Index Task-->Backup Database Task)Daily backup of user databases - Five subplans for each task : (Check DB integrity --> Rebuild Index -->Backup User Database, Backup Log -->Cleanup History)Weekly maintenance - SubPlan1 (Check Database integrity job (system+user DB)Â + rebuild index job (system+user DB) )
PROBLEM: I just noticed that the User DB Rebuild Index task has been running since the 03/04 and the Weekly maintenance plan - subplan1 since the 12/04.
Which job is "safe" to stop without impacting the database?
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Mar 1, 2007
Hi,
I've just creates a report with about 20 Tables. To my suprise, it almost runs as intended ;-)
But there is one flaw - Is there any way of hiding an empyt table?
I want to hide all tables that are not filled with data. But wich one is empty differs from the entered parameter.
So long
Sven
(Germany)
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Mar 19, 2003
I want to return a list of user tables from a database where the rowcount is 0. This will be a 3 step process: (1) truncate all 'New%' tables, (2) load data via ODBC/DTS into 'New%' tables, (3) list all 'New%' tables with zero rows (i.e. those that didn't get loaded, as all tables in the ODBC data source contain data).
I've tried:
select left(s2.name,32) as TableName, max(s1.rows) as Records
from sysindexes s1
inner join sysobjects s2 on s1.id=s2.id
where type = 'U' and s2.name like 'New%'
group by s2.name
HAVING max(rows) = 0
ORDER BY TableName
but of course there are multiple rows in sysindexes and the routine does not reliably return the correct list; for example the data in sysobjects & sysindexes, without the max and group by, might look like:
TableNameRows
NewARTxn0
NewARTxn1214800
NewARTxn1214800
NewARTxn1214800
NewARTxn1214800
NewARTxn1214800
NewARTxn1214800
I was hoping to come up with a single T-SQL statement that I could use in an xp_sendmail situation to email me the results.
Thanks for the suggestions.
Al
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May 6, 2015
I would like to empty out my 2k8 database (remove all the data in the tables only) And reloaded it with the data from production (2k5). I know I would have to dis-enable any constraints, triggers and remove all indexes before I can run a Truncate/Delete on all tables correct And then import the data via Wizard or script And lastly enable all the constraints & triggers, rebuild the indexes. Is this the only way to go about this? I don't want to do a backup & restore because the 2k5 doesn't have a 20% of the tables that are in 2k8. The 20% of those tables in 2k8 i'm not going to remove.
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Apr 9, 2004
We have an application that runs across the WAN to multiple locations. Performance is poor and we are looking at ways to improve performance. One suggestion from our Sr. Network Administrator is to change our Network Packet Sizes across all points, SQL Server & NIC to match the outgoing Router. This would be a size of 1440.
Does anyone have any thoughts or recommendations on this?
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