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• Read Only Domain Controllers and DNS zone updates

  - by Mike M

  I have a Windows 2003 domain and just added a new DC that runs 2008 R2. I updated the schema accordingly for both forest and domain levels. I also made sure to run /rodcprep at the time I did this. I have a branch office with a 2008 R2 file/print server that is a read-only domain controller (DC). The one problem I have been having is with AD-integrated DNS records updates. In the data center, we had to make an IP address change on a particular server. All our other sites' DCs (2003) updated the record fine. The 2008 R2 DC in the data center also updates its record fine. However, the RODC in the branch office does not. So if I nslookup the target server on a 2003 DC, the IP address is correct. Same with the 2008 R2 DC in the data center. But an nslookup on the branch office RODC still pulls in the old IP address. Moreover, any new records we've created (e.g., just added a new terminal server) do not get updated on the branch RODC either. Is there something simple I'm missing? How do I get the RODC to sync its AD-integrated DNS records with the rest of my world? Thank you in advance for your responses. Mike

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• Datacenter IP Addressing and DNS Management

  - by user65248

  Hello everyone Basically we are setting up a small Datacenter, about 300 amps power and max 50 racks, Im saying these coz I wanna u imagine the size and requirements, I have studied networking mostly Microsoft and Windows based systems , but I cant get how the IP addressing and DNS management and configuration works in a Datacenter , and unfortunately I have to setup everything by myself but defe we will have some staff to do some job. Now my questions Datacenter IP Addressing Suppose we have got a block of 200 IP addresses from our ISP, How can I manage these block of IP addresses, is there any software out there to simplify this I heard that using DHCP server in a datacenter is not recommended, otherwise what would u say about MS DHCL server ofc considering we need to have backup serversin case of failur How can I assign a block of IPs to a specific rack, I know with different software and management its different but Im asking how it is done normally IP addresses are exposed to the whole network, what if a customer try to use an IP address and is not assigned to their server or rack , how can I prevent this or how can I track the IP usage DNS Management Im goin to setup at least two servers for our DNS servers, I know nothing about Datacenter DNS system, but I have configured DNS server in normal networks and also for webservers, Now I wanna know What exactly needs to be done for a DNS in a datacenter that is not done for normal networks. How can I configure PTR records why cant I configure PTR records on my webserver side DNS server and it should be done on datacenter DNS server , I mean what is the difference in DC DNS servers that allow us to to so , I know the question is very silly and simple but Im confused Is there any software outthere to allow doing the whole thing, I mean automatically add records to the DNS and also managin IP addresses !? Thanks in advance

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• dns configuration error in plesk

  - by Karthik Malla

  I purchased a domain www.softmail.me at Godaddy.com and tried it DNS and getting lots of errors and finally change my nameservers to my server DNS i.e. NS101.VPSLAND.COM and NS202.VPSLAND.COM and created a domain in my plesk panel (Marked DNS & Mail required). After adding my domain to my plesk panel of my server I opened DNS records of that domain and found DNS records are automatically generated to my needs as following 65.75.241.26 / 24 PTR softmail.me. ftp.softmail.me. CNAME softmail.me. lists.softmail.me. CNAME softmail.me. mail.softmail.me. A 65.75.241.26 mssql.softmail.me. A 65.75.241.26 ns.softmail.me. A 65.75.241.26 sitebuilder.softmail.me. A 65.75.241.26 softmail.me. NS ns.softmail.me. softmail.me. A 65.75.241.26 softmail.me. MX (10) mail.softmail.me. webmail.softmail.me. A 65.75.241.26 www.softmail.me. CNAME softmail.me. Finally I waited for a week for I am unable to use my domain. Also in DNS lookup I cannot find any records to my Server except name servers of VPSland. Do I need to add VPSland namesevers anywhere in Plesk panel? If so where? Can anyone assist me where the mistake is?...

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• DNS Round-robin, Load Balancing, Load sharing, and failover in 2012

  - by user1089770

  I have been reading many posts on serverfault as well as on other sites regarding all these. What I understand is, Multiple A records(round-robin dns) can be used for both : Load sharing (round-robin, but NOT load-balancing). Many people say that “Load Balancing” but I think there will be no load-balancing because “Balance” means (literally) “compare two(or more) and adjust” (and that is what Real s/w or h/w Load balancers do) but Browsers never do this, instead they randomly select and IP and connect to it. It doesn't have any knowledge about the current load of that server (probably, the IP it picked had the highest load!). Automatic failover (latest browsers only). Yes, I think DNS can be used as a simple failover system (at least in 2012, I dont know when it actually "came in effect"). please refer to : http://webmasters.stackexchange.com/questions/10927/using-multiple-a-records-for-my-domain-do-web-browsers-ever-try-more-than-one and Browser-based DNS failover using multiple A records and http://www.nber.org/sys-admin/dns-failover.html I would like to make sure my assumptions/findings are right. So let me know please.....

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• Windows Server 2008 - inexplicable system time jumps/glitches/inaccuracies

  - by Nathan Ridley

  I'm running a production web server on Windows Server 2008. On this server I have a database which logs certain user actions, but every now and again I inexplicably get database entries which, according to the record ID and the records immediately before and after, have the wrong time logged against them (7 days+ too old). For example, record ID 1001 will be for Dec 7, 11pm, 1002 will be for Dec 7, 11:01pm, then 1003 will be for Nov 28, 1:38am, then the next will be back on track again. The problem seems to occur in random records (or 2-3 records in a row) and crops up once every few days. This is absolutely baffling because there is only one place in the application that assigns this date/time value and it's simply the system UTC date. I have been synchronizing the system time to time-a.nist.gov (which I read in another article was a bit more reliable than the default time.windows.com) and it seems to occasionally get out of time anyway (3-4 minutes), but I'm speculating that occasionally the time server has a temporary glitch where the date changes to a drastically wrong value for a short space of time, then changes back. Either that, or the motherboard clock battery is screwed and the reason the time momentarily changes is that the motherboard loses the time and then the time synchronization puts it back again. Could either of my suspicions be right? Should I turn off time synchronization for a production server? Assigning dates to an event log where the dates are up to 2 weeks prior to the actual date is a severe problem I can't have when the next version of my application is released. Any suggestions or advice would be appreciated.

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• Accidentally dd'ed an image to wrong drive / overwrote partition table + NTFS partition start

  - by Kento Locatelli

  I screwed up and set the wrong output for dd when trying to copy a freenas iso, overwriting the wrong external hard drive. Ironically, I was trying to setup a freenas server for data backup... External drive is only used for data storage, system is entirely intact Drive had a single NTFS partition filing the entire device (2TB WD elements) Drive originally had an MBR partition table. Drive now shows as having a GPT, presumably from the freenas image. Drive was mounted at the time, with maybe a couple kB of data written/read after running dd Drive is just a few months old and healthy (regular SMART / fs checks) I have not reboot the OS (crunchbang) /proc/partition still holds the correct information (and has been stored) Have dd's output (records in / out / bytes) testdrive did not find any partitions on quick or deep search running photorec to recover the more important data (a couple recent plaintext files that hadn't been backed up yet). Vast majority of disk content ( 80%) is unnecessary media files. My current plan is to let photorec do it's thing, then recreate the mbr with gparted and use cfdisk to create another NTFS partition using the sector information from /sys/block/.../. Is that a good course of action (that is, a chance of success)? Or anything else I should try first? Possibly relevant information: dd if=FreeNAS-8.0.4-RELEASE-p3-x86.iso of=/dev/sdc: 194568+0 records in 194568+0 records out 99618816 bytes (100 MB) copied grep . /sys/block/sdc/sdc*/{start,size}: /sys/block/sdc/sdc1/start:2048 /sys/block/sdc/sdc1/size:3907022848 cat /proc/partitions: major minor #blocks name ** Snipped ** 8 32 1953512448 sdc 8 33 1953511424 sdc1 current fdisk -l output: WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sdc: 2000.4 GB, 2000396746752 bytes 255 heads, 63 sectors/track, 243201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/sdc doesn't contain a valid partition table

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• error while resolving DNS requires

  - by user2803887

  I followed this document to configure master-slave powerdns servers... http://linuxmanage.com/master-slave-powerdns-managed-by-poweradmin.html Installation completed perfectly no errors even I feel DNS is trying to resolve some queries and parameter.. but while going through intodns.com i get below error for domain names which i have created in powerdns name server installed as above guide. Error Mismatched NS records WARNING: One or more of your nameservers did not return any of your NS records. Error Multiple Nameservers ERROR: Looks like you have less than 2 nameservers. According to RFC2182 section 5 you must have at least 3 nameservers, and no more than 7. Having 2 nameservers is also ok by me. Error Missing nameservers You should already know that your NS records at your reported by your nameservers are missing, so here it is again: nameservers ns1.makeittiny.com. ns2.makeittiny.com. I am much new to powerdns so not able to figure out where problem.. i check all things but not able to make out where problem remains.

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• How to read a PS file in reverse order?

  - by Raja Reddy

  I have a PS file to be read in reverse order and process accordingly. Do we have a way to mention to read the file in reverse order in FD in COBOL module? OR do we have something to achieve the same using SORT? Note: Reading the records into a buffer (array) and using it in reverse order would be the first idea that comes to mind but that way doesnt work for file with millions of records. Your suggestions will be appreciated.

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• Validate a string in a table in SQL Server - CLR function or T-SQL

  - by Ashish Gupta

  I need to check If a column value (string) in SQL server table starts with a small letter and can only contain '_', '-', numbers and alphabets. I know I can use a SQL server CLR function for that. However, I am trying to implement that validation using a scalar UDF and could make very little here...I can use 'NOT LIKE', but I am not sure how to make sure I validate the string irrespective of the order of characters or in other words write a pattern in SQL for this. Am I better off using a SQL CLR function? Any help will be appreciated.. Thanks in advance Thank you everyone for their comments. This morning, I chose to go CLR function way. For the purpose of what I was trying to achieve, I created one CLR function which does the validation of an input string and have that called from a SQL UDF and It works well. Just to measure the performance of t-SQL UDF using SQL CLR function vs t- SQL UDF, I created a SQL CLR function which will just check if the input string contains only small letters, it should return true else false and have that called from a UDF (IsLowerCaseCLR). After that I also created a regular t-SQL UDF(IsLowerCaseTSQL) which does the same thing using the 'NOT LIKE'. Then I created a table (Person) with columns Name(varchar) and IsValid(bit) columns and populate that with names to test. Data :- 1000 records with 'Ashish' as value for Name column 1000 records with 'ashish' as value for Name column then I ran the following :- UPDATE Person Set IsValid=1 WHERE dbo.IsLowerCaseTSQL (Name) Above updated 1000 records (with Isvalid=1) and took less than a second. I deleted all the data in the table and repopulated the same with same data. Then updated the same table using Sql CLR UDF (with Isvalid=1) and this took 3 seconds! If update happens for 5000 records, regular UDF takes 0 seconds compared to CLR UDF which takes 16 seconds! I am very less knowledgeable on t-SQL regular expression or I could have tested my actual more complex validation criteria. But I just wanted to know, even I could have written that, would that have been faster than the SQL CLR function considering the example above. Are we using SQL CLR because we can implement we can implement lot richer logic which would have been difficult otherwise If we write in regular SQL. Sorry for this long post. I just want to know from the experts. Please feel free to ask if you could not understand anything here. Thank you again for your time.

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• How many inserts can you have in a sql transaction.

  - by Mav

  I have a task to do that will require me using a transaction to ensure that many inserts will be completed or the entire update rolled back. I am concerned about the amount of data that needs to be inserted in this transaction and whether this will have a negative affect on the server. We are looking at about 10,000 records in table1 and 60,0000 records into table2. Is this safe to do in a single transaction?

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• something about sql-dump

  - by Yang

  hi, guys, i know that sql dump is a series of insert sql statement which reflects all the records inside the database. but may i know what is it used for? why should we dump the database records? is every database supports dumping function? Any additional background information is welcomed! Thanks in advance!

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• Django: remove a filter condition from a queryset

  - by Don

  I have a third-part funtion which gives me a filtered queryset (e.g. records with 'valid'=True) but I want to remove a particular condition (e.g. to have all records, both valid and invalid). Is there a way to remove a filter condition to an already-filtered queryset? E.g. only_valid = MyModel.objects.filter(valid=True) all_records = only_valid.**remove_filter**('valid') (I know that it would be better to define 'all_records' before 'only_valid', but this is just an example...)

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• self join- how to use the aggregate functions

  - by Ranjana

  self join- how to use the aggregate functions select a.tablename, b.TableName,b.UserName from Employee a inner join Employee b on a.ColumnValue=b.ColumnValue and and a.TableName <> b.TableName and a.UserName=b.UserName and also to check whether the same user has count of records i.e Employee a = count of records of Employee b. how to add count function over here

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• Complex sorting of XML subnodes in .Net3.5 onwards

  - by MicMit

  XML structure expressed in Xpath kind of Records/Record/Actions/Action/ActionDate the other node on the same level Records/Record/Actions/Action/CTCDate Is there easy or not easy way to sort it on "order by ActionDate,CTCDate" ( in SQL notation ), but per Actions for each selected Record when we iterate somehow ( not per XML file ). File around 50M

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• Validate a string in a table in SQL Server - CLR function or T-SQL (Question updated)

  - by Ashish Gupta

  I need to check If a column value (string) in SQL server table starts with a small letter and can only contain '_', '-', numbers and alphabets. I know I can use a SQL server CLR function for that. However, I am trying to implement that validation using a scalar UDF and could make very little here...I can use 'NOT LIKE', but I am not sure how to make sure I validate the string irrespective of the order of characters or in other words write a pattern in SQL for this. Am I better off using a SQL CLR function? Any help will be appreciated.. Thanks in advance Thank you everyone for their comments. This morning, I chose to go CLR function way. For the purpose of what I was trying to achieve, I created one CLR function which does the validation of an input string and have that called from a SQL UDF and It works well. Just to measure the performance of t-SQL UDF using SQL CLR function vs t- SQL UDF, I created a SQL CLR function which will just check if the input string contains only small letters, it should return true else false and have that called from a UDF (IsLowerCaseCLR). After that I also created a regular t-SQL UDF(IsLowerCaseTSQL) which does the same thing using the 'NOT LIKE'. Then I created a table (Person) with columns Name(varchar) and IsValid(bit) columns and populate that with names to test. Data :- 1000 records with 'Ashish' as value for Name column 1000 records with 'ashish' as value for Name column then I ran the following :- UPDATE Person Set IsValid=1 WHERE dbo.IsLowerCaseTSQL (Name) Above updated 1000 records (with Isvalid=1) and took less than a second. I deleted all the data in the table and repopulated the same with same data. Then updated the same table using Sql CLR UDF (with Isvalid=1) and this took 3 seconds! If update happens for 5000 records, regular UDF takes 0 seconds compared to CLR UDF which takes 16 seconds! I am very less knowledgeable on t-SQL regular expression or I could have tested my actual more complex validation criteria. But I just wanted to know, even I could have written that, would that have been faster than the SQL CLR function considering the example above. Are we using SQL CLR because we can implement we can implement lot richer logic which would have been difficult otherwise If we write in regular SQL. Sorry for this long post. I just want to know from the experts. Please feel free to ask if you could not understand anything here. Thank you again for your time.

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• Temporary table resource limit

  - by Jk

  Hi, i have two applications (server and client), that uses TQuery connected with TClientDataSet through TDCOMConnection, and in some cases clientdataset opens about 300000 records and than application throws exception "Temporary table resource limit". Is there any workaround how to fix this? (except "do not open such huge dataset"?) update: oops i'm sorry there is 300K records, not 3 millions..

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• Oracle datetime in VB.net

  - by acadia

  I have a Oracle procedure to which I have to pass a datetime value (2/5/2010 11:46 AM) How do I pass this value from VB.net. When I pass the date as shown below it is not returning any records though there are records. With Cmd .Connection = FactsConn .CommandType = CommandType.StoredProcedure .CommandText = "sp_atas_image_qry" .Parameters.Add(New OracleParameter("vinspectiondatetime", OracleClient.OracleType.DateTime)).Value = "2/5/2010 11:46 AM" .Parameters.Add(New OracleParameter("io_cursor", OracleClient.OracleType.Cursor)).Direction = ParameterDirection.Output End With

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• MySQL table partitioning qn:

  - by JVXR

  I have a table (innodb) that will have billions of records eventually. Every 2nd week I expect ~ 500K records to get dropped into the table. I would want to partition this table based on the date on which the data is imported - luckily this is a field in the table that is of the format yyyy-mm-dd - Is it possible to partition it based on this date column ? I tried looking at the 18th chapter of mysql docs but couldn't figure out if this is possible. -tia

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• jquery pagination

  - by user295189

  We are using jquery for pagination. We are pulling millions of records from the database and then th jquery does the pagination on the front end. that is a very slow process. Can someone advice us of a solution in php and jquery where we pull 50 records at a time? Thanks

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• how to implement more functionality in webpage

  - by trans

  Dear All, I have a website in front page i m displaying 5 records ,for different options,i want that when user licks more he should be able to view next records.i would i keep track as whicg list has already been shown to user,since i m using an arraylist,can i ipmlement it through that.

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• DataRelation Insert and ForeignKey

  - by Steve

  Guys, I have a winforms application with two DataGridViews displaying a master-detail relationship from my Person and Address tables. Person table has a PersonID field that is auto-incrementing primary key. Address has a PersonID field that is the FK. I fill my DataTables with DataAdapter and set Person.PersonID column's AutoIncrement=true and AutoIncrementStep=-1. I can insert records in the Person DataTable from the DataGridView. The PersonID column displays unique negative values for PersonID. I update the database by calling DataAdapter.Update(PersonTable) and the negative PersonIDs are converted to positive unique values automatically by SQL Server. Here's the rub. The Address DataGridView show the address table which has a DataRelation to Person by PersonID. Inserted Person records have the temporary negative PersonID. I can now insert records into Address via DataGridView and Address.PersonID is set to the negative value from the DataRelation mapping. I call Adapter.Update(AddressTable) and the negative PersonIDs go into the Address table breaking the relationship. How do you guys handle primary/foreign keys using DataTables and master-detail DataGridViews? Thanks! Steve EDIT: After more googling, I found that SqlDataAdapter.RowUpdated event gives me what I need. I create a new command to query the last id inserted by using @@IDENTITY. It works pretty well. The DataRelation updates the Address.PersonID field for me so it's required to Update the Person table first then update the Address table. All the new records insert properly with correct ids in place! Adapter = new SqlDataAdapter(cmd); Adapter.RowUpdated += (s, e) => { if (e.StatementType != StatementType.Insert) return; //set the id for the inserted record SqlCommand c = e.Command.Connection.CreateCommand(); c.CommandText = "select @@IDENTITY id"; e.Row[0] = Convert.ToInt32( c.ExecuteScalar() ); }; Adapter.Fill(this); SqlCommandBuilder sb = new SqlCommandBuilder(Adapter); sb.GetDeleteCommand(); sb.GetUpdateCommand(); sb.GetInsertCommand(); this.Columns[0].AutoIncrement = true; this.Columns[0].AutoIncrementSeed = -1; this.Columns[0].AutoIncrementStep = -1;

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• SSIS flat file insertion failure to rollback

  - by Pramodtech

  I have simple SSIS package which reads data from flat file and insert into SQL database. The file has 90K rows and sometimes because of bad data package fails but it insert the partial records before it fails. What I need is if insertion fails at any time between, no records should be inserted into DB, rollback everything. how can I put it in transaction?

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• Filter a form using a command button on another form

  - by Shaun

  I have a form with a cmdbutton that at the moment opens another form and shows all records for several types of PartitionStyles and TrimFinishs (486 at present), I need to be able to filter the second form to show only the TrimFinish I need. Private Sub lbl600SeriesS_Click() Dim stDocName As String Dim stLinkCriteria As String stDocName = "frmModules" stLinkCriteria = "Forms!frmModules![TrimFinish] = 1" DoCmd.OpenForm stDocName, , , stLinkCriteria End Sub At the moment it shows only a new record, I know there should be 162 records using 1, what have I missed or done incorrect.

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• How can I speed up queries against tables I cannot add indexes to?

  - by RenderIn

  I access several tables remotely via DB Link. They are very normalized and the data in each is effective-dated. Of the millions of records in each table, only a subset of ~50k are current records. The tables are internally managed by a commercial product that will throw a huge fit if I add indexes or make alterations to its tables in any way. What are my options for speeding up access to these tables?

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• Controlling Trigger Execution When Bulk Importing Data

  - by Vishwa

  Hi In bulk insertion only in the last record trigger is executing. If I bulk insert 10 records the trigger is running only for the 10th record. But I need trigger to run on all 10 records. Please help me with an example

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