SQL Server Admin 2014 :: How Data Writes In Multiple Secondary Files If There Is No Filegroup Created
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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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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May 10, 2015
I run the following:
EXECUTE dbo.DatabaseBackup
@Databases = 'F1SB',
@Directory = 'F:SqlBackup2014',
@BackupType = 'FULL',
@Compress = 'Y',
@Encrypt = 'Y',
[code]...
I cannot see the file created in the directory. The account under which sql server the agen job run have full privileges on it and is sysadmin.Then i run the Command in ssms
BACKUP DATABASE [F1SB] TO DISK = N'F:SqlBackup2014<server>F1SBFULLIGS-DB01_F1SB_FULL_20150510_214455.bak' WITH NO_CHECKSUM, COMPRESSION, ENCRYPTION (ALGORITHM = AES_256, SERVER CERTIFICATE = [serverCertificate])
and I get this error message:
Msg 3013, Level 16, State 1, Line 13
BACKUP DATABASE is terminating abnormally.
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Aug 15, 2014
I have set the environment set for AutoRecover (for every 3 minutes and Keep information for 7 days under the SSMS 2014 Menu: Tools -> Option ->Environment -> AutoRecover).
I've rebooted the box and restarted the SQL Server service and nothing seems to create the files.
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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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Oct 15, 2015
I need to modify a table to reside on a new filegroup and also point TEXTIMAGE_ON to that filegroup instead of PRIMARY. Apparently in the past, the only way to achieve this via SQL is to create a new table, copy over data, drop the old table and rename the new table to the original name. I found this solution in the SQL Server 2005 forum.
Is there any other way to alter this table in order to point the TEXTIMAGE_ON to new filegroup using SQL Server 2014? We are on Standard edition. The technique I am using is the drop constraint (with move option) and add constraint (to new filegroup) commands. The data and indexes move, but not the text data (it still is in primary filegroup).
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Jul 17, 2015
I have inherited a database that is over-indexed, i.e. there are sometimes 10-20 indexes on a table. The performance is at times not great due to blocking from long running queries. I want to clean up the indexes as a starting point.
Through a query I found some time ago on the SQLCat blog I have discovered a large number of indexes in the database that have a huge disparity between reads and writes. The range of difference is sometimes almost 2 million more writes than reads. Should I just drop the indexes that have say, more than 100,000 more writes than reads and then see what the Missing Index DMVs tell me after a few days of running without those indexes?
In some cases there are a few hundred thousand reads but maybe a million writes on the index. Thus, there are a fair number of reads happening, just not in comparison to the number of writes. In some cases there are almost no reads and a million or more writes. I am obviously dropping those indexes. I just am not sure what to do about the indexes that do have a fair number of reads.
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Jan 9, 2015
I proposed on a new server that we separate Data Files, Log Files, tempDB, Backups, etc. onto separate LUNS on a SAN with High Speed Solid State Drives.I was told that with the new technology with solid state SAN's that it would decrease performance and that it did not work the same way as it did when you had RAID 5's etc.I thought that if things were cared out correctly by a SAN Administrator they would know how to configure for optimal performance.
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May 15, 2015
We have multiple databases on a single instance in an OLTP environment. I have my data files on a separate SAN LUN from my transaction log files (and a few NDFs split out onto additional LUNs). I was wondering if there is a performance benefit to putting each LDF file on its own LUN? Or at least my few busiest LDFs?
We are currently on 2012, but I'm having to put together specs for a 2014 installation and need to answer this question without having an environment in which I can benchmark different setups. I just want to hear whether or not others have done this (why or why not?).
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Apr 20, 2015
Im backing up to a network directory thats actually a mount point on a different server.My backup was slower than usual so i opened up perfmon to have a look.
When selecting the mount point from the Logical Disks section in perfmon i can see that writes/sec & write bytes/sec both show zero for a long period of time, even though the backup percent complete is increasing.Then all of a sudden the writes to the network share jump massively.
Is there some caching mechanism for backups in sql where during a backup data is only flushed to the disk periodically during backup?
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May 5, 2014
Assume if i have a connection(Application intent readonly) starts with reading, writing and again reading data for a report. how it will works in SQL 2014 Always availability on?
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Aug 11, 2015
We are not able to failover the AG to secondary replica. The process gets timed out and AG goes to resolving mode. Had to reboot the box in order to switch the AG back to primary node. We even rebuilt the whole AG from scratch but the issue remains.
Failed to bring availability group 'xxxx' online. The operation timed out. Verify that the local Windows Server Failover Clustering (WSFC) node is online. Then verify that the availability group resource exists in the WSFC cluster. If the problem persists, you might need to drop the availability group and create it again. [SQLSTATE 42000] (Error 41131). The step failed.
Not much information is available in the logs.
Version : sql server 2014 sp1
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Oct 25, 2015
We had a big issue today during maintenance work in our SQL environment.
So our environment:
- 2x SQL Server 2014 Enterprise on Windows Server 2012 R2 (SRV1 and SRV2)
-- Both Hyper-V VMs on different Hosts
-- Both configured to an Windows Failover Cluster and AlwaysOn Availability Group (AG1)
-- AG Listener: AG1_lis
-- No shared storage (each Hyper-V Host has its own local storage)
-- Asynchronous Mode
-- SRV1 is primary, SRV2 is secondary SQL node
What happened?
- Shutting down Windows on SRV2 due hardware maintenance
- Cluster goes offline, AG1 goes offline
-- Error message: "Stopped listening on virtual network name 'AG1_lis'."
-- Error message: "The availability group database "DatabaseXY" is changing roles from "PRIMARY" to "RESOLVING" because the mirroring session or availability group failed over due to role synchronization."
Results?
- AG1_lis wasn't available for our applications and they stopped working properly because database connection was lost!
I think, I HOPE, this is not the normale behaviour when one node is shutting down (especially the secondary node!)
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Mar 14, 2014
I have two databases like each other that one is the backup of another. Each DB have 2 filegroups. I want to replace one filegroup from one db to another. How do I do this? Or how do I backup and then restore?
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Nov 28, 2014
I work for a 24/7 shop. We currently have a table that is partition on monthly. I have to created a script that will add a new file group, add the new file to the group, and alter the the partition scheme and function. However, I need for this process to not cause a lock on the table. Typically I get the locking and issues when I am run the split command. Is there a way to prevent this from happening?
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Jan 18, 2015
we have many max fields in our database .
A role in performance says : It's better to separate this fields to another FileGroup with separate file.
Is the result good for performance? and what are the risks?
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Oct 14, 2015
I'm being asked to create multiple filegroups for a new database based on the table type, transaction, lookup, misc... From what i'm reading this doesn't make sense. I'm reading either large tables get file groups, nonclustered indexes when they are about the same size of the data, or a few other reasons...
First of all, we are talking about the same disk (please don't ask me about how it is configured) and I'm not sure yet if restoring separate file groups is even going to be necessary.
So here are my questions (beyond, the test and see what happens) because in the end I'm going to probably have to do what i'm told. So this is for my professional knowledge.
1. Does file groups separated by table type make sense?
2. Should you put tables that are queried often together in the same or different file groups.
3. I'm pretty sure you can't restore single file group for write access, am I correct?
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Nov 12, 2014
Recently I have faced one DBA interview, below is the question they asked me.
" Does AlwaysON secondary replica support Full backup, if it is not why"?
I know AlwaysON secondary replicas support only copy_only and tlog backups, why they wont support full backup?
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Apr 21, 2015
USE <database>
select * from sys.database_files
and
select * from sys.master_files where database_id= <db id>
give me different size of memory optimized file in <database>
Microsoft SQL Server 2014 - 12.0.2456.0 (X64)
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Oct 14, 2014
We have a reporting database which is refreshed daily from prod backup and later creating new tables/views/indexes as part of the refresh job. Is there a better approach we can implement in sql 2012/2014 for this scenario since we are planning to migrate to sql2014.
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Oct 12, 2015
I am working on adding DBs to the AG but for some reason I am getting this error.
"Joining DB on secondary replica resulted in error"
Msg: The remote copy of the database is not recovered far enough to enable DB mirroring or to join AG. Missing log records have to be applied to the remote DB by restoring the current log backups" Which I did. I took the log backup of DB1, restored it on DB2 with no recovery, but still I am getting the same error.
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Jan 13, 2014
I want to use service SIDs for my SQL Service accounts but also want to have the data files on a NetApp filer CIFS share. The 2014 installer prevents installation if CIFS and Service SIDs are used. I tried to install with domain account on CIFS, and then to swap back to Service SIDs afterwards, but couldn't find a way to do it.
I granted the AD Computer account Full Control to the CIFS share, so it should work, but I just can't work it out at the moment.
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Feb 2, 2015
I've been trying to get a definitive answer to this question but alas I have conflicting and patchy answers so far from other sources. I have an index that, lets say, requires 10GB of data space to rebuild..This index resides on a filegroup that spans 2 files on two seperate drives (i.e. a mdf and ndf)
When I rebuild this index how will each of these datafiles grow as the rebuild proceeds to completion? Lets for the time being remove the caveats of any other activity hitting the example index/database in question.My tests seem to show that only the mdf will grows (or the file with the lowest id in the that filegroup) provided there is enough space available in that particular file to complete the operation. The secondary ndf dat file doesnt grow at all if the mdf has enough space.
Is expected behavior? i.e. the index will be rebuilt in a contiguous manner relative to the files contained with the filegroup i.e. fileid 1 will grow till limit reached then next fileid grows etc?
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Jun 11, 2015
How do i find Total allocated space and used space of a memory optimized filegroup?
use memory_optimized_db
Go
select (SUM(size)*8.0)/1024.0 as Space,
FILEGROUP_NAME ( data_space_id ) , type_desc from sys.database_files
group by data_space_id,type_desc;
above query gives "current used size of the container " of memory optimized file group but doesn't give Total space detail.
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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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Sep 15, 2015
I have 3 servers taking part in an AlwaysOn AG.
I want to grant a user READ access to only one replica, and certainly not to the principle.
How do I go about doing this?
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Oct 1, 2014
I have a Windows Server 2012 R2 2 node cluster with SQL Server 2014 FCI installed. Data files are on a separate Windows Server 2012 R2 file server. Data files share has been permissioned to the SQL Server service and SQL Server Agent service accounts as Full Control. NTFS Permissions are Full Control.
When I try to attach a database
CREATE DATABASE AdventureWorksDW2012
ON (FILENAME = 'apricotmssql_VIOLETMSSQL12.MSSQLSERVERMSSQLDATAAdventureWorksDW2012_Data.mdf')
FOR ATTACHI get this error:
Msg 5120, Level 16, State 101, Line 4
Unable to open the physical file "apricotmssql_VIOLETMSSQL12.MSSQLSERVERMSSQLDATAAdventureWorksDW2012_Data.mdf". Operating system error 5: "5(Access is denied.)".
If I log into the file server (called APRICOT) and look at the NTFS permissions they all look good. I have also reapplied the NTFS permissions from the root folder down.
EDIT
If I log on to one of the nodes in the cluster as the SQL Server service account and navigate to apricotmssql_VIOLETMSSQL12.MSSQLSERVERMSSQLDATA and copy and paste the data file, it works fine.
EDIT2:
If I log on to the file server and Enable Inheritance at the root level, then Replace all child objects with inheritable permission entries from this object, I get this error:
User Account Control settings on all nodes and the file server are set to Never notify
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Sep 12, 2015
We have 2 switch between primary and secondary this morning.
after that one database in secondary went to "initializing / recovery pending".
How can i exit from this situation ?
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Nov 6, 2015
As per attachment, i have been created replications but in local subscription it is not populated any thing at the same time, Subscription database has been created but tables is not populated as per publication table.
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May 7, 2014
I want a mechanism that search the content of all files in my upload folder, then return the address of the file that contains that keyword...
The content of the files are not in the table,just the addresses are saved in table...
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Dec 1, 2014
Until yesterday I had a server running SQL Server 2008 R2 - with all the SQL Server DB files on an attached disk array.
The server died - so I attached the disk array to a new server - and all the DB data files are visible there.
I installed SQL Server 2014 on the new server and am trying to work out how to point it at the existing database files.
I also have backups of the DB's - but they will take ages to copy over and restore - so it would be much easier to just use the db files. Should I restore the master db first (easy as its small)?
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May 20, 2015
Is there a better way to deal with the virtual log files?...I see several approaches in dealing/decreasing the virtual log files for a database..want to know what's the best n safest approach, from the masters here?
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Oct 12, 2015
how to shrink log files in SQL 2014 alwaysOn ?
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