Difference Between Multiple Primary And Secondary Files..
Apr 10, 2006
Hi all..!
If I want to split an SQL DB into several physical files (as its 500GB
disk ran out of space, won't even run shrinks any more, and we bought
another 500GB disk to add to the PC)
then what is the difference between:
Adding another File to the primary group which will reside on the new
group;
Adding another file in another group.
We do not want to set any db objects (Tables, indexes)
to a secondary file, as this will involve lengthy data moving
operations. We would like the DB to continue working from where it is
utilizing the added space in a contigous (striped) manner.
Will striping occur in both cases? as I understand striping it means
that our stuck SQL Server will awake back to life as it will now have
500GB more data for its DB, even though we haven't set any of its
objects (tables, indexes) to explicitly use the secondary NDF file on
the new disk?
or will it only utilize the new space if we set some objects to reside
on that NDF?
for example if we run large queries which crash now (due to lack of
space) when we add the second drive will they start to work as the
process will grow striped from the full drive to the new drive, even if
all the queries' source tables are all still set to the old drive?
Thanks for any replies?
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Nov 12, 2014
I read , When sql server Database having multiple data files within single filegroup then sql server writes data in multiple proportional file algorithm where the amount of data written to a file is proportionate to the amount of free space in that file, compared to other files in the filegroup.
so if there is no filegroups created and multiple secondary files are attached in databse , is there same way data stored and writes data in multiple files by the same algorithm or any different way.
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May 7, 2014
A little background on what I am trying to achieve first. We are moving to Azure virtual machines and we will have 8 disks on the SQL Server box. I am adding more files to the primary file group and each file will go on its own drive. I am then rebalancing data across these files by rebuilding all of the indexes on the tables which is working fine. No problems so far all is good.
I now have an additional problem. If there is a lob or blob column on the table, rebuilding the clustered index and all the non clustered indexes doesn't rebalance the blob or lob data across the disks such as it does with in row data.
I cannot find any articles on rebalancing lob or blob data because all the articles say to move to a new file group. I do not want a new file group, I just want to use the primary file group where the data already resides, and just redistribute it evenly in the same way that I can in row data which is working fine.
One solution I thought about was to BCP data out of the table, truncate the table and then BCP back into the table which I imagine would have the desired effect of distributing the data evenly over the files.
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Dec 31, 2006
Hello,
I would like to know how do I carry out this two cases in efficient way:
1. I have two SQL 2005 servers running. One as primary, one as secondary. I would like to synchronize or replicate the transactions at real-time.
2. When primary goes down, I would like my secondary server to take place in needless of IP changes and application settings.
If you have a good architecture on this, please share with me. I am not sure whether my questions are clear enough or not. I also will be reading some articles about these. Thank you in advance.
Regards,
Paing
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Sep 23, 2015
"If we fail over a SQL AG group on a failover cluster from one node to another making the secondary the new primary, is there any reason why we would have to fail it back over to the old primary node?"
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Apr 15, 2015
Is index created on only primary key or it can be created on secondary key ?
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Apr 11, 2014
Looking for info on ole/requirement of primary and secondary replica under SQL Server 2012 AlwaysOn.
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Oct 3, 2014
I have a SP that runs on the primary in 18 min and 45 min on the secondary( poorly written cursor,trying to fix it).Both machines are Exactly the same.I ran them in the middle of the night when no one was on the Sec. Node as we use it for reporting.
PLE: 7,000+
AVG Disk sec/write below .01
AVG Disk sec/read below .01
CPU below 5%
both machines set a max dop 4
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Sep 28, 2015
As per our client requirement we want to set synchronization time from primary replica to secondary replica after 20 minutes. Is it possible in MSSQL AlwaysOn Availability Groups in SQL Server 2012?
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Aug 6, 2014
I was working on a job to send me info each morning about database file free space and was noticing some odd things when looking at the log file VLFs for one of my databases in an AlwaysOn availability group.When I run DBCC LOGINFO on the secondary replica for this database, I get what I expect and most VLFs have a status of 0 (indicating the VLFs are reusable or unused). When I run DBCC LOGINFO on the primary replica, all of the VLFs have a status of 2 (active or recoverable).
Since log backups on the secondary replica in AlwaysOn still truncate the log in the primary replica, I would expect that the VLFs in the primary replica would also be mostly in a reusable or unused state. My log file sizes are the same size on each server and my backups are completing successfully. what might be causing the VLFs on the primary replica to have a status of 2 in DBCC LOGINFO when taking log backups from the secondary replica?
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Jul 20, 2015
In my environment always on is there. Today I observed that primary server fail over to secondary server .now the secondary server acting as primary role.
Can I know when is fail over is happened and who did the fail over. Is there any script to find this?
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Jul 14, 2015
I have a database around 500 GB. right now the database have only one data file and one log, it has only one filegroup also.all the indexes and table are placed in Primary Filegroup . we are going to separate them. the planing is to move all the indexes to Secondary filegroup and all the table will be in Primary filegroup.But there will be a problem while implementing it because there are around 600 tables and each table have at least 2 non-clustered index , so is there any way to move all the index to Secondary Filegroup.
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Apr 29, 2014
Why shrinkfile empty file does not redistribute data evenly in the primary file group with multiple files:
Please run the script attached to see what the end result is.
This is what I set up last night on my test machine.
1) Create database [FGTest] size 200MB
2) Create table called TEST on primary
3) Insert 40MB of data into test
4) Create another file group called temp in primary size 200MB
5) Shrinkfile('FGTest',emptyfile) so that all data is transfered from FGTest into temp file group.
6) Add another 2 files called DATA2 and DATA3. Both are 200MB.
7) We now have 3 empty files that I want data distributed evenly on. FGTest, DATA2 & DATA3
8) Shrinkfile('temp',emptyfile) to move all the data from temp over the 3 file groups evenly
I would expect at this stage to have the following:
FGTest = 13MB,
DATA2 = 13MB,
DATA3 = 13MB
(40MB of data over 3 files should be about 13 MBish in each file)
What I actually end up with is this:
FGTest = 20MB
DATA1 = 10MB
DATA2 = 10MB
It looks as though SQL Server is allocating 50% of all data to the original file and then 50% evenly over
the remaining files in PRIMARY.
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Mar 23, 2015
I have a 2 node cluster with 2 standalone 2k14 instances having alwayson setup. As per client requirement we have created a client access point with a cname alias in dns to connect to secondary replica. Now, everytime whenerver the roles switch over one has to manually move this resource from the previous secondary node to the new secondary node. This is tedious, and should not be done manually either, so I am looking for a way to automate it so that as soon as the role switches over, the resource group after some time should also switch over to the current secondary.
Env details
xa (current primary)
y2a (secondary)
client access point (resource group): aglreadtest
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Jul 27, 2015
I have been creating databases in SQL 2008 with a primary filegroup for the system objects and a secondary, marked Default, for the data.
We are preparing a migration to SQL 2014, and the administrator is complaining he won't adopt this structure on the new servers because 'there is no benefit' and 'a backup cannot be restored (!?)'.
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Oct 21, 2003
I have a database with 2 log files VE_log and VE_log2 (the split is left from legacy system with limited disk space). I want to eliminate the 2nd log.
I've tried SHRINKFILE (EMPTYFILE), which of course reduces the file to the default minimum pages, SHRINKFILE (TRUNCATEONLY), SHRINKDATABASE (VE), and in every case the ALTER DATABASE REMOVE FILE command fails cause the log isn't empty.
Ideas???
Thanks,
Al
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Oct 2, 2014
I have a scenario where a customer is going to be using Log Shipping to the DR site; however, we need to maintain the normal backup strategy on the current system. (i.e. Nightly Full, Every 6 Hour Differential and Hourly Transaction Log backup)I know how to setup Transaction Log Shipping and Fail-over to DR and backup but now the local backup strategy is going to be an issue. I use the [URL] .... maintenance solution currently.
Is it even possible to do regular backups locally keeping data integrity for your backup strategy with Transaction Log Shipping enabled?
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Feb 24, 2003
I'm converting DBs from SQL7 to SQL2K; the previous owner & server issues had created secondary data and/or log files. The size of the databases, and the configuration of the new server, do not warrant those secondary files. In restoring the databases from SQL7 to SQL2K, either by detach/copy/attach or backup/restore, is there a method for deleting the secondary files without, of course, losing any data?!
TIA,
Al
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Mar 18, 2015
I am new to SQL and I haven't written any scripts in the past. I thought I would give it a go. Basically, I am trying to write a script that will check if a database has more than one log files, free the VLFs that belong to the secondary log files and then remove them. I created a database named rDb as this link suggests and followed the steps.
[URL] ....
It works. However, I want to have to run just 1 script that will do the entire job. This is what I have gotten so far and it doesn't work:
create table #tempsysdatabase(
File_id int,
file_guid varchar(50),
type_desc varchar (20),
data_space_id int,
name nvarchar (50),
state int,
[Code] ....
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Jan 19, 2008
hello all sorry m asking Database Question .. m talking about SQL SERVER 2005 but i have bit confusion... what difference between a
primary key and a unique key? if m not wrong then primary key doesn't allow NULLs, but
unique key allows NULLs but in many searches comes that primary key doesn't allow NULLs, but
unique key allows one NULL only. what this means 'one NULL only'?? according to my practical we can give more then 1 nulls... plz clear this point???
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Aug 10, 2015
What is the difference between the Index and the Primary Key?
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Jun 9, 2014
I have 2 SQL Server replicas configured on SQL Server 2012 AlwaysOn. e.g. SQL1 & SQL2.
I have configured backup job on both SQL Server with the following statement. and the job occurs every 10 minutes.
•declare @DBNAME sysname,@sqlstr varchar(500)
set @DBNAME = 'dba'
IF (sys.fn_hadr_backup_is_preferred_replica(@DBNAME)=0)
BEGIN
--Select 'This is not the preferred replica, exiting with success';
[Code] ...
I turned off SQL2 for Windows maintenance. So there is only SQL1 is online. Afterwards. I checked the backup folder and didn't see any new backup files was created after SQL2 was offline. I rerun the job. It still doesn't backup database on the Primary Replica. Then I searched on SQL Server Book online. It says
Prefer Secondary
Specifies that backups should occur on a secondary replica except when the primary replica is the only replica online. In that case, the backup should occur on the primary replica. This is the default option.
According to what it says, it should backup on the Primary Replica.
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Apr 20, 2015
I have not used log shipping before and find myself in a position where I need to reboot the secondary node and then the primary node and I don't actually need to failover.
Is there anything I need to be aware of. When rebooting the secondary node I assume the transactions will be held in the primary nodes log till the secondary comes back and just carry on once back up?
When rebooting the primary node nothing needs to be done and the log shipping will just start again once it has come back?
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Jul 14, 2015
Inside my sp on the Primary server are 3 commands:
exec msdb..sp_start_job @job_name = N'JobA' --
Running on Primary ServerEXEC Server2.msdb.dbo.sp_start_job @job_name = N'JobB';Running on Secondary ServerSelect * from Server2.Table --
Running on Secondary Server
So far the commands are working just fine when I kick them off one at a time. But when I kick off the sp as a whole I notice that the timing just isn't keeping up. For instance, Step 3 is running before Step 2 is finished. It appears that as the Primary Server kicks off Step 2, it doesn't seem to care about the outcome and moves right to Step 3 which in turn provides me erroneous data.How can I get Step 3 to wait until Step 2 is actually finished keeping in mind the Secondary server is part of this equation?
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Jan 24, 2015
i have created a new login in primary server and provided dbowner permission to primary db.how do i transfer this login to secondary server and assign the same permission to secondary db ?
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Jul 23, 2005
Taking a course on SQL. They are saying you can get better performance byhaving multiple files for a group.They then graphically show an example of "Primary" with multiple data files.I have tried altering PRIMARY to have multiple data files and I get anderror. I have tried creating a new database with multiple PRIMARY files andget an error.I can ALTER and CREATE secondary files with multiple data files with noproblem.Am I mixing apples with oranges, does their "Primary" mean somethingdifferent then "PRIMARY"?Looking at help it seems that you can only have one PRIMARY data file and Iam thinking their use of "Primary" means the primary group where you willhave your tables, not the PRIMARY group. Just don't want to lock onto thewrong concept.Thank you
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Jan 14, 2008
Hello
We have set up Log shipping between Primary and Secondary DB. The secondary DB is right now option: Standby/Read-Only. I can not take Backup of Secondary DB now.
Shall we disable Log shipping and change the DB Option to Multi-user mode and take backup? or any different method, without disabling log shipping?
please advice. Thanks in advance.
Jay
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Jun 16, 2015
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Whether I need to create separate data flow task for each file or separate package? In addition to these, example : while importing product data into product table, if product ID already exists, we need to ignore it and upload only the new records.
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Mar 14, 2008
I have two database file, .mdf and .ndf files but when i check in the database property settings
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My intension is to have two filegroups. but why it is not showing as secondary , for both the files it is showing primary only.
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Jun 27, 2006
I have a couple of hundred flat files to import into database tables using SSIS.
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However, the example for the Foreach Loop Container has multiple files all being imported into the same database table. In my case, each file needs to be imported into a different database table.
Is it possible to import each set of files with the same format into different tables in a simple loop? I can't see a way to make a Data Flow Destination item accept its table name dynamically, which seems to prevent me doing this.
I suppose I could make a different Data Flow Destination item for each file, in the Data Flow. Would that be a reasonable solution, or is there a simpler solution, or should I just resign myself to making a separate Data Flow for every single file?
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Jun 18, 2014
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Aug 7, 2000
Hi,
Can anyone tell me a solution how to combine 3 primary files that are existing in a particular database into one. One of the database that was running has three primary(.mdf) files. Can any one tell me whether the files created in that way has impact on the performance of the server.Solution for this problem is highly appreciated. Thanks in advance.
VS.
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