SQL Server 2008 :: Estimate / Calculate Performance Overhead From Replication?
Jun 10, 2015
I've been asked to put together an estimation for the performance impact that replication would have on our database server during a particular operation. I know that this depends on a lot of different factors, including:
* Number of articles being replicated
* Types of articles being replicated
* Number of DML transactions that would result in delivery of replicated data
Any way to turn this into a meaningful metric?
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Feb 4, 2015
I have a table like below,
CREATE TABLE Student
(
Id BIGINT not null
,Name NCHAR(20) not Null
,Branch NVARCHAR (64) null
)
The table contains : 100000 rows .
1)Number of rows in a data page
2)Total number of pages required for the table
3)Total Table size in KB or MB
4)Total file size in Kb or MB
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Apr 22, 2015
What is the best way to forecastestimate space for non-clustered index on a table?
Example :
Table name : Test123
Row : 170000000
Reserved : 18000000 KB
Data : 70000000 KB
Index: 40000000 KB
Note: Test123 already has clustered index and 2 non clustered indexes.
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Jul 9, 2007
Does anyone have any specific performance information using AES or other encryption schemes supported by SQL Server 2005?
- What method did you find works best?
- Did you encrypt any XML Data?
- Did you encrypt specific columns or whole tables?
Thanks,
Michael
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Mar 17, 2015
Work on sql server 2008 r2, need recursively charge amount calculation process.want to write an sp, In my sp I need to calculate head sum base on parameter head and given amount: Picture describe my db input set, from the input set I need to calculate total charge amount on given head,
Input set 1 HeadAmountIsPercentHead PercentGiven AmountCalculated AmountWorking Sequence
Utility10NoTotal400101
Sum10
Input Set 2 HeadAmountIsPercentHead PercentGiven AmountCalculated AmountWorking Sequence
Wages 10YesFinancial8001 2
Financial 10YesTotal 10 1
Sum11
[code]....
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Apr 9, 2015
My data is looks like this,
Date---------------------------------------A
2015-03-01 13:38:07.343----------------1
2015-03-01 14:04:04.460----------------1
2015-03-02 19:33:55.117----------------3
2015-03-02 19:33:55.117----------------4
2015-03-02 19:39:26.580----------------1
I want data looks like this
Date-------------------------------------------A
Day 1------------------------------------------2
Day 2------------------------------------------8
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Oct 8, 2015
I have client table which has client_id Eff_from and Eff_to columns.Eff_from and Eff_to are the dates that client is eligible for service. I need to know the average number of days from the day that he became not eligible and new eligibility date .
CLIENT_IDEFF_FREFF_TO
1001 12/24/200712/8/2010
100112/13/20123/26/2013
1001 5/27/20138/2/2013
10019/24/201310/30/2016
for expl days between
12/8/2010 and 12/13/2012
3/26/2013 and 5/27/2013
8/2/2013 and 9/24/2013
then AVG them.
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Oct 16, 2015
I have 2 tables, one of those table is master formula which has some records like this :
Table1: MasterFormula
NoDescriptionFormula
1Occupancy
2Leased
3Rate Consumed
[Code] ....
Table2: TransactionFormula
Only has 2 fields, No & Amount
the formula fields means, we sum the Amount from TransactionFormula table for each No., for example if the formula is [3]+[8] means, we sum the Amount from No=3 added with the Amount from No=8 and we added records on TransactionFormula for row 9
Here's the example result for TransactionFormula records
NoAmount
1100
2100
310
43
510
610
720
810
920[3]+[8]
1020[6]+[8]
1140[7]+[9]
121.2[4]*[11]/100
134.58([11]+{12])/9
1445.78[11]+[12]+[13]
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Jul 29, 2015
Our fiscal year starts on July 1st. Each month they call a period - so July is period 1, August is period 2, etc.
They are wanting a report that pulls numbers for a given period. There are parameters for them to select the fiscal year and the fiscal period, and then it calculates the numbers for that period. That part works fine.
Now they want me to do some calculations, and one of them is to divide one of the numbers by the # of days since the fiscal year. So if they choose July, it would be 31 days. If they choose August, it would be 61 days, etc. How can I set this up to calculate the number of days when they really aren't entering a start date, it's just a fiscal year and period.
Is there a way to calculate a date field that is 07/01/xxxx where xxxx is the fiscal year they chose? Also a way to calculate a date field that would be the last date of the month for the fiscal period and year they chose?
I suppose I could add 2 other parameters where they enter the start of the current fiscal year, and the last day of the period they're running it for, and use a datediff to calculate that. Just seems kind of redundant.
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Oct 7, 2015
I have a challenge and I'm not sure the best route to go. Consider the following dataset.
I have a table of sales. The table has fields for customer number and date of sale. There are 1 - n records for a customer. What I want is a record per customer that has the customer number and the average number of months between purchases. For example, Customer 12345 has made 5 purchases.
CustomerNumber SalesDate
1234 05/15/2010
1234 10/24/2010
1234 02/20/2011
1234 05/02/2012
1234 12/20/2012
What I want to know is the average number of months between the purchases. And do this for each customer.
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Mar 20, 2007
Hi
I have been doing some testing with SQL Server 2000 using a packet sniffer, and have found that it is sending bytes with a value of 0x00 between each "valid" character. For example, if it was going to send "hello" over the network, it would be transmitted as "h.e.l.l.o".
Can anybody suggest why this might be. It happens regardless of what client is used - ADO.NET, osql.exe, etc. Is it something to do with the encoding used?
Everything does work fine and the data is received intact, but if these seemingly redundant bytes could be removed then it would increase performance by 100%.
Thanks
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Jul 23, 2005
I would like to capture about 20 rows from the sysperfinfo table every30 secs on a production server. I am thinking of ways I can reduce thedisk (not network) I/O overhead of this process. Instead of readingthe table from a local SQL Agent job and writing to a local table, I amwondering if I should create the job to capture the data from a remote(less critical) server. The servers are connecting via a gigabit lineand are in the same server room on the same switch. This way theproduction server would be required to do the reads but the otherserver could take care of the I/O of the writes to the capture table.Also, this job would run from 7am to 7pm non-stop. A waitfor delay of30 seconds would control the twice a min scheduling. Running this onthe remote server would free up a few SQL Agent CPU cycles as well.This would be one less job for the production server to worry about.Thanks
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Feb 11, 2015
Which values are best prepared value for given below memory objects
Memory
Parameter
Total memory=
SQL Cache Memory=
Lock Memory=
Optimizer Memory=
Connection Memory=
Granted WorkSpace Memory=
Memory Grants Pending=
Memory Grants Success=
Cache Details:
Cache Hit Ratio=
Cache Used/Min=
Cache Count=
Cache Pages=
Scheduled Jobs:
Job Status=
Run date & time=
Job Time=
Retries Attempted=
Need to know the above performance counters prepared values.
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Aug 13, 2015
WHILE (@MyLoop3 > 0)
BEGIN
SELECT Top 1 @UploadId = UploadId,@FirstName = (CASE WHEN FirstName = '' THEN @Update ELSE FirstName END),
@LastName = (CASE WHEN LastName = '' THEN @Update ELSE LastName END),
@Claim = (CASE WHEN Claim = '' THEN @Update ELSE Claim END),
@Insurer = (CASE WHEN Insurer = '' THEN @Update ELSE Insurer END),
@InsurerBranch = (CASE WHEN InsurerBranch = '' THEN @Update ELSE InsurerBranch END),
[Code] .....
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Apr 9, 2008
im trying to measure the amount of CPU used in a backup and restore, using the SQL Server Databases: Backup Restore counter in Perfmon.
I can select The counter, but it does not let me select an instance database to monitor.
see image:
I have 3 instances on my machine, 2 sql 2005 and 1 sql 2008. why do these instances not appear? i dont know how to set up this monitoring.
if i type LOCALHOST or 127.0.0.1 in the "Select counters from computer" text box i can see all databases under my sql 2005 instances, but not the ones under the 2008 instances. I have disabled all sql server 2005 services and can confirm none of the sql 2008 instance databases are showing up.
this is a huge problem, especially for when i start stress testing sql server 2008 in preperation for upgrading.
anyone any ideas on why i cannot see sql server 2008 instances in perfmon? I have tried from a remote pc also with the same results.
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Dec 18, 2006
Hello,
I have been experiencing some difficulties with poorly performing synchronizations using replication from SQL Server 2005 to SQL Server Mobile running on Windows Mobile 5 devices. Currently there are two main databases (each client will only use one of them), the 1st one has around 500,000 rows, and the 2nd has about 1,200,000 rows. The initial synchronization for the 1st database takes around 45 minutes, and for the 2nd, around 2.5 hours. This is quite long, but we have comforted our clients by saying that this is a one time delay, and that further synchronizations will be much quicker. Well, synchronizing the data after this is usually quite speedy, however, things get bad rather quickly when the number of changes increases.
In normal cases, the client will have at most a few thousand changes and all is well, the synchronization will typically be under a few minutes - no big deal. Once in a while though, there are a substantial number of changes to the database (from the SQL Server 2005 side), perhaps around 50,000 changes. When this happens, the synchronization process doesn't seem to ever finish (I've left it over the weekend and come back to find it still synchronizing). For the record, there seems to be a level at which the database will finish synchronizing, but be agonizingly slow - around 10,000 to 20,000 records will finish eventually (but take a few hours, at which point it's faster to just blow away the database and start again from scratch). This is obviously not acceptable, and I need to find a way to resolve this. Does anyone have any thoughts?
While on this topic, why does this synchronization process take so long anyways? The snapshot creation (even for the database with millions of rows) finishes in a couple minutes, and the actual transfer of data shouldn't take more than a few minutes. The device can't possibly be storing the database content in memory (the SDF file ends up being between 40MB and 100MB), but when I watch network activity, there tends to be an initial busy period, then a periodic and fairly small spike every few seconds until the process completes, so the connection isn't being saturated at all.
At this point, I am almost considering breaking the nice database design I have and creating combined logical records to see if reducing the number of rows may help. I'd really prefer not to have to go this route though, so if anyone has any suggestions, I'd really appreciate some feedback.
Thanks,
Adrien.
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Feb 11, 2015
We have a SQL Server 2008 that is being replicated transactionally (log shipping) onto another SQL Server 2008.
Can we report against the replication slave without disrupting the replication process? I have been informed that the slave server needs exclusive access to the db in order to apply the transaction log.
If this is the case, are there any configuration changes which would allow us to report from the slave without impacting replication?
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Feb 26, 2015
I am trying to configure replication using a script. I created the distribution database as well as the publisher. Now, I am running the stored procedure in one of the subscribers to create subscription. However, I keep getting the same error over and over again. The error reads:
msg 50000, Level 16, State 1, Procedure usp_create_AccountSubscriber, Line 43
Failed to execute SP usp_Create_AccountSubscriber: This database is not enabled for publication
what does it mean? how can i solve it?
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Feb 27, 2015
i have replication setup and working, there are 3 subscribers and now i want to add a 4th one. is it ok if i just add the subscriber and reinitialize replication?
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Apr 25, 2015
I need to setup snapshot replication for 1 large table.
Source table: SourceDatabaseName.dbo.MyTable1
Target table: TargetDatabaseName.CustomSchema.MyTable1
In the above example, how can I specify the target DB's CustomSchema name (it's currently creating dbo, not CustomSchema)
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May 5, 2015
I'm looking for a process to archive data through replication. I have nightly job that purge records in few source tables(publisher) retaining only 3 yrs data. I have archive database (subscriber) that contains prior 3 yrs data and current 3 yrs data.
Before nightly job DELETES records in Source table i want to STOP replication so that the delete is not replicated in archive database. After the job completes i would like to TURN ON replication so that any new inserts and updates in Source will ONLY be replicated in archive database.
My DBA tested this but after last step of turning replication back ON archive database is sync'd with source table.
There are around 70 tables where 30 of them are transactional tables that needs record purge. Developing ETL process is possible but tedious.
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May 18, 2015
I'm in a project to replicate a database from the production environment to another sql server.
The idea is use it for some biggest querys because in the production database we had experimenting various problems. What is the best way for do it? Transactional replication? Log Shipping? I'm reading absolutely everything but I can not get decide.
Both servers are SQL Server 2008 R2 and they are in the same LAN.
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Jun 15, 2015
How do we know our schema changes will propagate to subscriber without breaking the replication? Is there any t-sql command to find out the option true or false?
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Aug 5, 2015
SQL Transaction replication, specifically SQL backup and restore Transaction replication. So Scenario,
S1 = Primary Server 1
R1 = T - Replication Server 1
R2 = T - Replication Server 2
So we have S1 replicating to R1, and we want to build another subscriber which is R2.
Can I take the Replicated Database from R1, backup it up, then restore it to R2, and create the publication/subscription?
Will that work? if not, is there an easier way to avoid the snapshot? the reason i ask this is because we do have replication snapshot, but takes long. One of my Colleagues stated he tried this, however replication made duplicate rows on R2, which is why he had to use replication snapshot.
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Feb 25, 2008
Wondering if anyone has any experience with SQL Server Express Edition (SSEXP). We're looking at a mobile sales force type model, so a local database on a laptop with no real time network connection. So the users would collect data locally, then connect up to the network every few days to replicate the data to a central server.
So questions.. Has anyone tried anything similar? How stable/mature is SSEXP? Any other thoughts, alternatives or gotchas anyone can think of?
Thanks for the input.
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Mar 4, 2015
We have a central office with a SQL2005SP4 server (yeah, I know... old as heck) that's the main database and it has multiple subscribers in regional offices. Well... one of the regional offices server is failing, and it needs to be replace.
The original server is an ancient Win2003 86x
The Server team will build a new Win2008r2 64x, and use the same name and IP address
And I'm tasked with the SQL part.
I'll be installing the same version/patch of SQL, but 64x instead, and migrate all databases, including the system databases.
How do I handle replication? Do I need to reintialize from scratch? or can I just use the backup as a starting point?
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Mar 19, 2015
Is there a way to force the snapshot to use a format file when bcp'ng the data to the subscriber?
The publisher and subscriber schemas are slightly different. Mainly added columns to the subscriber.
We have a post snapshot script that updates these additional columns on the subscriber.
I'd like to force the snapshot to use a format file, so it doesn't error when initially loading the data to the subscriber.
Is this possible?
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Jul 1, 2015
Currently, we are on SQL2008R2 EE SP1 CU13 across the board.
We are planning on upgrading the primary SQL server to SP3.
Question: Will transactional replication continue to work properly even if the Publisher is upgraded to SP3 but the subscribers remain at SP1 CU13 ?
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Jul 15, 2015
When creating the snapshot I didn't choose the option copy non-clustered indexes. I created some indexes manually on subscriber database. Replication failed later with some issue.
so reinitialized with new snapshot but all the indexes are gone from the subscriber database.
How to keep the indexes without dropping from subscriber database whenever we reinitialized with snapshot
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Sep 1, 2015
We are approaching the "go live" date of a big application upgrade, so while the application is being upgraded i was asked to lock out all users and backup all databases and make sure the data isnt changed during a period of time
It turns out, as one of my databases is being replicated to another server, i cant put that database in read_only mode, or restricted_mode, without removing the replication.
Removing the replication means i have to set it up again and that means another 3 hours added to an already cram-packed weekend without sleep!
How I can lock out the users to make sure there are no changes to a database other then read_only/restricted_mode/single_user ?
I really don't want to touch that replication...
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Oct 27, 2015
We have a domain joined SQL 2008 R2 server performing a snapshot database replication to a non-domain joined SQL 2008 R2 server. The snapshot replication is working with one exception. Under one of the tables, there is a Key, Constraint and Index that are part of the database. The Key and Indexes is copying over. However, the constraint is not. Why would the Key and Index copy but not the Constraint?
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Sep 4, 2009
I am running SQL 2008 Enterprize Edition with SP1 on Windows 2008. I am trying to set up replication. I have completed the following:
1. Created distribution Database
2. Created publisher
3. Granted SQL Agent access to the ...MSSQL100Com folder to execute the agent_exe files
4. Granted SQL Agent access to ...MSSQLinn where the subsystem_dll files are located
5. Granted SQL Agent write permissions to ...MSSQL
epldata in order the write the bcp files
Each time I try to initialize the snapshot, I get the following errors in the SQL Agent Log
1. Log Step.......cannot be run because the LogReader subsystem failed to load. The job has been suspended.
2. Log Step.......cannot be run because the Snapshot subsystem failed to load. The job has been suspended.
I found posts where the records in the msdb.dbo.syssubsystems pointed to different folders than where the dll and exe files are located. So, I checked that, but they are correct.
The SQL Agent has sysadmin on the SQL Server and is using a windows service account.
I believe it is a security issue because I can run the executables from the command prompt to generate the snapshot for the publication. Have I missed the forest for the trees?
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Feb 1, 2011
I've got two databases on the same server and replicate some tables from one database to another.The replication is configured so not to drop the table if it exists, but to delete the data based on the filter if one exists. There are two tables on the subscriber that have some extra columns.
I get "field size too large" error when trying to replicate them. Is there a workaround without having to make the publisher and the subscriber tables identical by schema?
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