Redundancy
Mar 3, 2004
Hi All,
After some feedback from some of you who might have done something similar:
We are going to be having 3 SQL servers (running SQL Std licence).
2 Are live
1 is a hot swap in the event that we have a total loss of either of the SQL boxes.
Basically what I am wanting to do, is have the hot swap being updated periodically so that the databases are being replicated on this box, so that if the live one fell over, we could very quickly get the hot swap into take over.
Can anyone offer any perspectives on the best method of attack for this?
Thanks in advance for your thoughts.
Cheers
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Aug 20, 1999
What is the best way to insure 100% availability of our SQL databases? Should we use clustering, mirrored servers (Vinca or Double-take)?
What are other organizations doing about this?
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Jun 7, 2006
I have read the data redundancy is bad for relational databases. Is there such a thing as a good time to use redundant data for more complex queries?
ie. if you have a query that joins 4 tables (or more) and returns 100+ records...
Table 1 - 1000 records
Table 2 - 500 records
Table 3 - 500 records
Table 4 - 30,000+ records
...would it be better to have some redundant data in table 1 rather than calling table 4.
Thanks for any guidance.
- Andrew
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Dec 3, 2004
My company has valuable data being constantly logged to a database 24/7. Actually, the data logs to two separate database systems in case one goes down for whatever reason such as power failure, routine maintenance, glitch, whatever. These two systems are housed at different physical locations.
We are planning to set up a third database system which polls the other two every minute. It compiles and mantains a deduped, clean, and complete collection of data from the other two database systems. If one of the first two systems goes down or misses a row, the third will automatically get the data from the other system. If this deduped database system goes down, we can rebuild the data from the other two.
Does this seem like the right route to take or is there a simpler or safer route available?
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Sep 21, 2005
Hey Guys,We have a merge replication on 2 MsSQL servers and wondering if its possible to allow the 2 connection strings in our application?So if SQL Server 1 doesnt responed, then the other one will take over.we currently have this in our global.asax:Public Shared dbConnString as String = "Server=xxxx;Initial Catalog=xxxx;User Id=xxxx;Password=xxxx;" So is it possible to change this to look up the first server and then connect to a second server if needed?Thank you for any advice at all.
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Dec 29, 2005
Hey guys...i've got a problem wif my stored procedures...in which my page keep repeating the same data...so to counter this problem i use SELECT DISTINCT instead of just SELECT..but the problem is when i change SELECT into SELECT DISTINCT...the page will not be display,page error....for your information my stored procures was auto generate from some security sofware...so can guys help me out with my code...
SELECT DISTINCT t.TargetID, 'V' RecordType, t.TargetDNSName [Target DNS Name], t.TargetIPAddress [Target IP], t.TargetIPDisplay [Target IP Display], t.TargetOSName, t.TargetOSRevisionLevel, v.SecChkID, v.Severity, sc.TagName [Tag Name], sc.ChkBriefDesc [Tag Brief Desc], sc.ChkName [Tag Chk Name], CONVERT(NVARCHAR(4000),sc.ChkDetailDesc) [Tag Detail Desc], CONVERT(NVARCHAR(4000),r.RemedyDesc) [Remedy], o.ObjectID, o.ObjectTypeDesc [Object Type Desc], o.ObjectName [Object Name], s.SensorDataID, a.AttributeName, a.AttributeValue, NULL [Port],NULL [Service Name],NULL [Protocol]
FROM #Vulns v INNER JOIN TargetHost t (NOLOCK) ON v.TargetID = t.TargetID INNER JOIN (SecurityChecks sc (NOLOCK) LEFT OUTER JOIN Remedies r (NOLOCK) ON sc.SecChkID = r.SecChkID) ON v.SecChkID = sc.SecChkID INNER JOIN ObjectView o (NOLOCK) ON v.ObjectID = o.ObjectID LEFT OUTER JOIN SensorData1 s WITH (NOLOCK, INDEX(SensorData1_AK3)) ON v.ObservanceID = s.ObservanceID AND s.Cleared = 'n' LEFT OUTER JOIN SensorDataAVP a (NOLOCK) ON s.SensorDataID = a.SensorDataID AND a.AttributeValue IS NOT NULL AND a.AttributeValue != ''UNION ALL
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Feb 25, 2000
I was trying to modify a table and I got a "data error: cyclic redundancy check"
So I ran a DBCC CHECKDB and got this:
Server: Msg 823, Level 24, State 1, Line 3
I/O error 23(Data error (cyclic redundancy check)) detected during read of BUF pointer = 0x11c902c0, page ptr = 0x14d66000, pageid = (0x1:0x3d), dbid = 26, status = 0x801, file = d:MSSQL7datacontent_Data.MDF.
Connection Broken
This is scary stuff! What does it mean and how do I fix it?
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Jul 20, 2005
I have a table that I want to have a precalulcate length on a character fieldand group and sum up. Thought I could do this by creating a view with a groupby clause that includes the sum function. Unfortunately, the compilercomplains with:A clustered index cannot be created on the view 'MyView' because the indexkey includes columns which are not in the GROUP BY clause.Wish I could verbalize the problem a little better, but the following pareddown example should serve as a demonstration:SET ANSI_WARNINGS ONSET ANSI_PADDING ONSET ANSI_NULLS ONSET ARITHABORT ONSET CONCAT_NULL_YIELDS_NULL ONSET QUOTED_IDENTIFIER ONSET NUMERIC_ROUNDABORT OFFGOCREATE TABLE myTable(myID INT NOT NULL,RecNum INT NOT NULL,TestString VARCHAR(80) NOT NULL)GOINSERT INTO myTable VALUES(1, 1, 'a')INSERT INTO myTable VALUES(1, 2, 'ab')INSERT INTO myTable VALUES(2, 2, 'abc')GOCREATE VIEW dbo.MyView WITH SCHEMABINDING ASSELECTmyID = myID,slen = SUM(LEN(TestString)),recn = COUNT_BIG(*)FROM dbo.myTableGROUP BY myIDGOCREATE UNIQUE CLUSTERED INDEX IX_MyView ON MyView(myID, slen)-- A clustered index cannot be created on the view 'MyView' because-- the index key includes columns which are not in the GROUP BY clause.GODROP VIEW MyViewGODROP TABLE myTableGOThanks,Chris Rathman
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Sep 30, 2015
Today a vendor bluntly stated that VMWare provides the same failover and redundancy for SQL that would render "AlwaysOn" high availability unnecessary.
Essentially that VMWare would detect a problem and failover and have .9999 uptime .
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Feb 2, 2015
Automated and manual backup done through SQL Management console are failing with error 23 - redundancy check failed.
This is a critical production db. Other db in same instance backs up ok.
Is there a way to fix this?
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