High Safety Changed To High Performance After Fail Over ?
Mar 6, 2008
Hi There
I realise this is a stupid quesiton but i cannot really find any confirmation of this in BOL.
If you are running High Safety with automatic failover, when failover occurs does this automatically change to High Performance mode. SInce for failover to occur something has happen with the primary , it will be impossible to commit transactions on the new primary and mirror asyncronously since 1 of them is no longer available.
So am i correct in assuming that automatic failover also automatically changes the mode to High Performacne for that session?
Thanx
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Oct 1, 2006
Hello!
I'm reading about database mirroring in High Safety Mode (Synchronous with no witness). I'm a little confused about what happens if the mirror server disappears.
From Books Online
"If the mirror server instance goes down, the principal server instance is unaffected and runs exposed (that is without mirroring the data)."
http://msdn2.microsoft.com/en-us/library/ms179344.aspx
I was to the course [Upgrading your Database Administration Skills to SQL Server 2005] and the course material does not say the same."Scenario: Synchronous mirroring without a witness server. If the mirror server becomes unavailable, the principal server will take the database offline. This action attempts to maximize the protection of the database and ensure the integrity of its contents"
I've made tests that shows that Books Online is right,
but I would like to know if this is a behaviour that has changed.
I also would like to know if it's possible to run in a more secure mode,
where exposed operations is not allowed.
Best regards
Ola Hallengren
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Apr 9, 2015
We have 2 data centers, site 1 and site 2. Site 1 is generally our primary, and site 2 is our Disaster Recovery (DR) site. I want to setup a SQL instance to have extremely high availability. Therefore I was looking at using DB mirroring, with synchronous data writing, high-safety and auto-failover. This requires the usage of a witness server.My problem with this setup, is that if the witness and principal are both at site 1, if site 1 goes away (power failure, asteroid impact, lol, anything else that would be a *true* DR scenario), then there is no failover to the mirror server at site 2. However, if you put the witness at site 2, anytime the WAN link between site 1 and site 2 has an issue, the DB will auto-failover to site 2. Is the reason for the recommendation of the witness being at the primary site because the thinking is that WAN link failure is likely more common than a *true* DR scenario that takes out all of site 1?
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Apr 23, 2007
Hi,
Is there a way to configure mirroring to go from High Availability to High Protection without having to reconfigure Database Mirroring? Using the interface in Management Studio, I can change the configuration option to High Performance, but not High Protection despite both of them being Synchronous.
If not, what are the recommended steps to configure the mirror once it already has been configured? Is just like initially setting up the mirror or would there be any shortcuts I could take? If I stop the mirroring and remove the witness, will the High Protection option be available?
Thanks,
J.
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Jun 12, 2007
I am in the process of designing a database infrasture layout that can virtually scale to an very large number of servers in efforts to improve performance. The Scale-out architecture vs. grid computing (something like Oracle RAC) seems to be the way to go. It may take a lot more work up front, but it seems very flexible in the long run.
One of the issues that I am trying to tackle is how should I grow this thing. Right now, I have one single 4 way server running SQL 2005 Ent. edt. We are planning on getting a second server as well as a Enterprise level San solution.
With my 2 goals in mind (Scale out architecture and High Avail) should I bring this second server online as a passive cluster node, or should I partition out the data across both nodes. Will clustering even be part of my fault tolerence plan or should I use replication?
Its hard to find a good answer as what is the *best* way to make this happen.
Any insight will be greatful...
Thanks!
Eric Elliston
http://www.rbdstudios.com
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Dec 22, 2007
Ive got an ETL process I have written which takes about 10 million rows from a staging database and loads it into production database with an INSERT statement. The INSERT statement makes a function call to retrieve the surrogate key for each row. The function looks in a replicated copy of our production database so no load is on our production environment during this time.
So: INSERT INTO foo(...) SELECT name, address, zip, dbo.fnGetSurrKey( name, address)
It took about 12hrs to insert 6 million rows last night and Im wondering if there is a better way of doing this. Maybe a multithreaded way like SSIS might have.
Assuming my function is optimized as much as possible, does anyone have any tips for speeding this up?
Also, the machine this ran on has 16gb of RAM but was setup to use only 2GB during this process. I have already changed it to 12gb and restarted the process a week ago, but the change doesnt take affect until you reboot. Would I see a significant performance increase from that?
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Mar 19, 2008
Hello ,i am a master student and i am making a seminar about high volume DB performance problems ,example : if i have a table with length of 1000000 record and this length is growing exponentially by the time,what the problems may i face in insertion ,deletion , search,in such table?? and what the problems in processing such DB in general
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Jul 23, 2005
I posted a link to a prior article in here, that one about highperformance hierarchies, and have the first two parts of a new series.Hopefully this is of value to someone.http://www.yafla.com/papers/SQL_Ser..._sql_server.htmThanks.
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Feb 11, 2008
Hi,
I am working in Trade enivornment and i have experience only on SQL 2000.
Each day approximately 4 million data gets loaded and transactions being happened in my server.
Please let me know which database(Sql/Oracle..) can i use for high performance with free or one license.
I am looking for a database which is having hhigh speed in retrieving large data and having massive storage with no performance issues.
Some suggested me to use Informix, but still im doing a R&D work on it.
Please suggest me with two or three different datases with their high performance features.
Thanks in advance
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Jan 4, 2007
I am looking to improve the performance of my sql server databases.
I currently have a dual location system, the database server setup is basically a quad xeon with 4gb at my office and a double xeon with 4gb at a remote webhosting location. There are separate application/web/intranet servers at each site. The two databases servers are replicated with the local server publishing to the remote server.
The relational database holds circa 26 million records, growing by a volume of 10,000 per day, there are approximately 50,000 queries performed per day.
My theory is that the replication of the two databases is causing a slowdown; despite fast network connections (averaging 200ms between servers) the replication seems to place a large load on the local server. Would it be sensible to replicate to a second local server and then replicate to the remote server, placing any burden on the second server?
I am planning to upgrade the local server to a high capacity 4+ cpu 64bit server, my problem is that although I have noticed a slow down in performance over time, I am unsure how to go about measuring and quantifying this in order to diagnose the bottlenecks and ensure that investing in a new server would be worthwhile. Where would one be best advised to start this project?
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Dec 11, 2007
I recently converted a column that was once an int to an bigint on one of my tables. The modified column provided a generic row id information and there are duplicates within this column. I am trying to perform a self join via the following:
SELECT a.row_id FROM test_db a INNER JOIN test_db b ON b.row_id < a.row_id.
This code use to work when the column was an int but now I am getting high CPU issues since I converted to bigint. I am unsure on why the change to bigint will cause such an issue. The OS/SQL is 64BIT.
Thanks for the help in advance.
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Feb 21, 2007
We recently implemented merge replication.We were expereincing. The replication is between 2 SQL Servers (2005) over same network box, and since we have introduced the replication, the performance has degraded considerably on subscriber end.
1) One thing that should be mention is that its a "unidirectional Direction" flow of changes is from publisher towards subscriber (only one publisher and distributor as well and one subscriber ).
2) Updates are high than inserts and only one article let say "Article1" ave update up to 2000 per day and i am experiecing that dbo.MSmerge_upd_sp_Article1_GUID taking more cpu time.what should be do..
on subscriber database response time is going to slow and i am experiencing a lot of number of LOCK time outs on application end.
can any one can also suggest me server level settings for aviding locking time out.
looking for any experieced solution/suggestion.
Thanks in advance.
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Jul 21, 2000
I need to use a system-generated key and will have over 2 billion items.
I'm considering using a data type like the following.
Decimal(19,0) will give me the large numbers I need without making my index wider than 9 bytes.
Uniqueidentifier is 16 bytes.
Anyone know if this will cause me pain in the future? Specifically using @@identity after inserts to get the value (i tested it seems OK).
CREATETABLEIdentityTest
(
MyIDDECIMAL (19,0)IDENTITY (1,1),
MyCharchar(1) NOT NULL DEFAULT 'Y'
)
Any ideas welcome.
Dano
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Mar 21, 2000
After a fresh install of SQL 6.5 with SP5a(or without), the cpu is running at anywhere from 50%-80%. It is loaded on a PDC, but when I stop the sql service cpu utilization drops to 0-2%. When I start the sql service it's right back up there, does anyone have a suggestion as to how to fix this or why the service would be doing this?
Thanks, Christel
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Mar 2, 2004
Hello everybody,
We are starting new project
Customer validation with minimum wait time.
How to insure High-Availability?
We have 2 standard servers and in past used custom log shipping.
Log shipping still requre manual intervention ,while goal to switch
between servers automaticly.
Clustering is a last possible solution.
Could someone recomend any other soluion or products?
Thank you
Alex
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Aug 14, 2002
Hello,
We are experiencing high disk i/o on one of our RAID disk systems. Can someone tell me how I can identify the query or user or process which is causing this high disk i/o?
Thanks,
Brent.
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Sep 5, 2002
I am getting high CPU utilization on the SQL Server process (>90%).
However the overall utilization (NT -- entire box) always seems to be under 50%.
Can someone explain why this is happening. The server is a quad; the SQL server process seems to be using only two CPUs at a time (not the same ones all the time).
Lightweitht pooling has been turned on and the maximum worker thread size has been left at the default value (255).
How can I configure SQL options to spread the load across all four CPUs ??????
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Oct 20, 2005
COLOR=Blue]Hi all,
What can be the reason there is a high CPU usage even when there's only 1 database being accessed. As a result the database is really really slow.
CPUperformance usage goes as high as 100% and I can't for the life of me figure out what's causing it. The indexes are being rebuilt 3/4 times a week and I've checked to make sure there aren't any locks or anything.
Any other ideas? [/COLOR]
Thanks
B.
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Nov 14, 2007
We have a live server that has had very high CPU usage in the last few days, therefore the site is extremely slow. There are about 60,000 users per day on the average. It always had high CPU usage, but not as bad as in the last few days, in the 90s, sometimes even reaching a 100.
Any solutions? I've run SQl Profiler to check on queries that have high CPU usage. When I run the same queries on our staging server, they are very quick. For example, the same query can take 1 minute on stage, but 12 minutes on the live site. We do know that this is also related to traffic, during lower traffic times, the same query takes less time, but still never as fast as stage.
Oh yeah, it's SQL Server 2005 and asp code running IIS6 on windows 2003 server.
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Feb 28, 2008
I have a summary table with a 9 field composite primary key. Every 10 minutes, my system generates 2 files of 500,000 to 750,000 rows to be summarized into this table. I first Bulk insert those into a temp table, and then trigger an inner-join update query to do the updates, followed by a left-outer join to do the inserts. As the day goes on, millions of rows in my summary table, this process is too slow. Any ideas about causes/solutions???
RLiss
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May 17, 2006
i have high cpu problem. i don't know why many .net sqlclinet dataprovider and IIS hold so much cpu resource. by the way, memerycondition is normal.when i restart sqlserver, from windows task manager, i see the cpu timeof sqlserver.exe process is low, but it grows gradually, and in twodays, it can grow to as high as 2:xx:xx.any one can tell me why .net sqlclinet data provider and IIS hold somuch cpu resource? and why cpu time of sqlserver.exe grows gradually?thanks a lot.below is the part of a trace report:TextDataApplicationNameDurationStartTimeReadsWritesCPUNULL.Net SqlClient Data Provider189123357:46.529168411040076NULL.Net SqlClient Data Provider277798310:19.27923583730414NULL.Net SqlClient Data Provider189504657:42.722503411526282NULL.Net SqlClient Data Provider189957657:38.2161560740425570NULLInternet Information Services43009602:52.77042962721518NULL.Net SqlClient Data Provider277362310:19.16577581019828NULL.Net SqlClient Data Provider68673308:21.03144731014904NULLInternet 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SqlClient Data Provider30257614:51.91455351801266NULL.Net SqlClient Data Provider94970357:49.66191501238NULL.Net SqlClient Data Provider34781323:29.93622901203NULL.Net SqlClient Data Provider76679630:17.53368101170NULL.Net SqlClient Data Provider107081039:00.44675901109NULL.Net SqlClient Data Provider49532648:22.548276101095NULL.Net SqlClient Data Provider50011048:49.252299511078NULL.Net SqlClient Data Provider37954657:49.7448401062NULL.Net SqlClient Data Provider88336028:20.94006501049NULL.Net SqlClient Data Provider24511033:33.0489701032NULL.Net SqlClient Data Provider88495328:19.33754801031NULL.Net SqlClient Data Provider60478303:26.6451490968NULL.Net SqlClient Data Provider49395303:29.5640980955NULL.Net SqlClient Data Provider54786019:17.0377930938NULLInternet Information Services29589006:38.7446491907NULL.Net SqlClient Data Provider33442300:18.767960891NULL.Net SqlClient Data Provider86037628:43.9126870858NULLInternet Information Services40493639:47.8471172843NULL.Net SqlClient Data Provider68973331:53.8315881796NULL.Net SqlClient Data Provider50568649:43.33473121796NULL.Net SqlClient Data Provider50345348:13.1276641764NULL.Net SqlClient Data Provider72609348:20.5210820702NULL.Net SqlClient Data Provider24520333:32.9381320688NULL.Net SqlClient Data Provider28625010:41.9285548686NULL.Net SqlClient Data Provider173781330:13.5169100659NULL.Net SqlClient Data Provider34089023:36.953030625NULL.Net SqlClient Data Provider34144023:36.327820625NULL.Net SqlClient Data Provider41397050:40.9287224610NULL.Net SqlClient Data Provider34073323:37.0213300608NULL.Net SqlClient Data Provider53148348:02.7270060595NULL.Net SqlClient Data Provider35764025:20.5402862594NULL.Net SqlClient Data Provider56892033:54.6284070593declare @P1 int set @P1=1033 declare @P2 int set @P2=20644 execp_splitpage @sql = 'SelectUserName,Status,Qymc,Qylb,areaCode1,SiteHits,Zycp, CONVERT(varchar(300), Qyjj) AS Qyjj,QyjjStatus,compPhone,compFax From UserInfoWhere isValid=1 and Right(Status,1).Net SqlClient DataProvider481308:18.211296955578NULL.Net SqlClient Data Provider49670348:13.6268720563NULL.Net SqlClient Data Provider49137349:58.5275230562NULL.Net SqlClient Data Provider37967019:33.5404290562NULLInternet Information Services39212632:22.61511612543NULL.Net SqlClient Data Provider51453048:13.0228450532NULL.Net SqlClient Data Provider65514048:42.740750531declare @P1 int set @P1=5587 declare @P2 int set @P2=55867 execp_splitpage @sql = 'SelectInfo.picPath,Info.Info_ID,Info.postUser,Info.infoT ype,Info.infoLevel,Info.infoDirect,Info.showname,I nfo.postDateTime,Info.areaCode,CONVERT(varchar(300), Info.conten.Net SqlClient DataProvider94014:55.0139021180516exec p_splitpage 'SelectID,UserName,PassWord,Qymc,RegisterTime,name,Phone From UserInfo WhereisValid = 1 and UserName like ''%nick%'' andSUBSTRING(Status,2,3)=''019'' Order By ID DESC',0,30InternetInformation Services131335:39.814030516NULL.Net SqlClient Data Provider24104607:30.7216430514NULL.Net SqlClient Data Provider56918635:46.737300499NULL.Net SqlClient Data Provider36893650:51.7199720486NULL.Net SqlClient Data Provider102501628:10.9231642485NULL.Net SqlClient Data Provider54798619:16.9340860485NULL.Net SqlClient Data Provider42397013:13.4397300483NULL.Net SqlClient Data Provider37964012:11.1330690470NULLInternet Information Services18441037:30.3261545468NULL.Net SqlClient Data Provider43448606:16.9191610468NULL.Net SqlClient Data Provider36296652:15.4190060436NULLInternet Information Services11064001:43.984251422NULL.Net SqlClient Data Provider37975057:40.8210330419NULL.Net SqlClient Data Provider5279655:44.9159260406NULL.Net SqlClient Data Provider33442300:18.7325502392NULLInternet Information Services11436047:40.4148070390NULL.Net SqlClient Data Provider39812636:26.138510343NULL.Net SqlClient Data Provider155228331:21.2164340329NULL.Net SqlClient Data Provider4187655:55.8164293328NULL.Net SqlClient Data Provider36928023:08.5144192328Select Count(ID) From UserInfo Where isValid=1 and Right(Status,1)<>'0'and hy = '0019'.Net SqlClient Data Provider98308:31.9232480298SELECT TOP 5 L.title, L.siteUrl FROM Links L INNER JOIN LinksCategory CON C.PKID = L.CategoryID INNER JOIN LinksType T ON T.typeID = C.typeIDWHERE (T.typeID = 7).Net SqlClient DataProvider3057654:41.622720282
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Oct 17, 2006
Could anyone help me in finding out why the cpu utilization is very high??
I have two servers say, Server A , server B. There is a transactional replication going on from server A to B
There is a table say Table A on server A, which is being replicated to server B.
I created a trigger insert and update trigger on Table A on server B (i.e. on subscriber). Since then, the CPU utilization for server B is very high 80-90%
when i used profiler, i could see .whenever replication stored proc for insert or update executes..cpu utilization goes up..
trigger just insert the updated/inserted rows into some other table.
Could anyone tell me why the cpu utilization has gone up so much?? i am using sql server 2005
thanx
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Apr 4, 2002
Hi,
The following SQL is got high CPU time SP activity Enterprise manager.
EXECUTE msdb.dbo.sp_sqlagent_get_perf_counters
Could you please tell what is purpose of this job and why it take high CPU time.
Thanks
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Jan 17, 2002
SQL 6.5 - 5.5 Gig
NT
Hello,
Throughout the day our Document Management application generates high busts of physical page reads when users query the database.
What SQL configuration parameter(s) should I check/modify to insure that the database is performing at it's optimun during these bursts?
Thank You in advance.
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Sep 27, 2001
I have a few in house developed application (VB based) that access the SQL server for adding, appending , creating tables. The application does the changes thru queries dynamically generated at the application level.
My MS SQL Server runs on a PIII / 256 MB Ram / 18 GB HDD
The problem is that the memory utilization of SQL server keeps growing constantly. Out of 512 MB (256 Physical + 256 Virtual) available teh memory utilization reaches a level of 490 MB and statys constant. Though SQL Server shows a utilization of 150 MB.
I suspect that SQL is not releasing memory back to the system. Please help in resolving. The problem may lie at the applications developed.
Jdindian
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Oct 22, 2002
We are experiencng high cpu utilization across all 4 cpu's at the top of the hour when our transaction log dump job runs. Has anyone observed this bahavior before? Is there anything we can do to mitigate this? Thank You.
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Jan 19, 2003
Hi,
I am new in SQL SERVER.I wanted to setup high availability database.It would be great if any one could answers my questions please.
-What are the options availability for HA except clustering?
-How to set up log shipping HA ?
-How to monitor log shipping?
-Is standby DB and log shipping same ?
-Can I setup log shipping without backup/restore method.Like I have to create db1 on server A and create db1 on server B and then configure log shipping?
-Is it necessary to ship log for master database or only user Database?
Thx
-Blace
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Sep 25, 2006
hi all
I got a small MSSQL server.. total database file size less than 7GB. with 2G rams installed 2 cpus. but for some reason when i check the task manager process mem usage is over 1.7G. the sql server memory setting in on Dynamically not fixed. and maximum 2G i believe is default. anyway. my question is over 1.7 memory usage is too high? because i dont have alot of transaction going. and cpu usage is very low. wondering if this's normal or not. and if is not normal . what cause the memory usage so high...... and how can i adjust back to normal. ? can anyone help me out? or any suggestion? thanks
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Mar 21, 2008
Hi:
one production server DB is getting slower... (SQL2K sp4 ent)
1. dbcc checkdb(abc) with 0 errors
2. no blocking
3. no abnormal in sql log and event system log
4. only found one crypt32 auto update fail last night.
the Lock Requests/sec is kind high from 5400 to 15400 on 0.01 scale. max is from 57611 to 155411.
Could I increase the locks assigned to sql and what is the best way for it?
thanks
david
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Dec 30, 2005
Hi
I have an sql server with very high usage. The web which is connected to the sql server has approx. 1000 unique visitors every time.
The database is optimized and the site goes really fast now.
But a problem we've had since the beginning is that SQL Server constantly uses 1.8 GB of RAM. Never less, never more.
Do you have any idea on how to decrease the usage of RAM. I am sure that this high usage is necessary.
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Oct 15, 2007
Hi,
For the last week, our production SQL server is running very slow and causing the CPU usage to go 80-100 % almost all the time. This causes certain queries to time out. Our application has never timed out before ever. Also, we did not do any updates on our production machine or installed anything recently.
Has anyone of you ever experienced this issue? If yes, then what did you do to resolve it? any help would be greatly appreciated.
Thanks for your help!
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Oct 27, 2013
I have to describe Microsoft SQL High Availability options in the following layers: infrastructure, middleware and application. I know there are following options available: failover clustering, replication, mirroring and AlwaysOn but I am not sure in which layer each of them are.
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May 17, 2004
I have implemented log shipping between 2 databases, the transaction log size normally between 10mb - 50mb every 15 minutes during normal working hours, but it grows to 9GB when we run database optimization job and that makes it hard and long to transfer and apply the transaction log on the other database. Does anybody encountered a situation like this and is there a way to minimize the size of the Trans log after the optimization job?
Thanx
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