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  • What are some good tips for a developer trying to design a scalable MySQL database?

    - by CFL_Jeff
    As the question states, I am a developer, not a DBA. I have experience with designing good ER schemas and am fairly knowledgeable about normalization and good schema design. I have also worked with data warehouses that use dimensional modeling with fact tables and dim tables. However, all of the database-driven applications I've developed at previous jobs have been internal applications on the company's intranet, never receiving "real-world traffic". Furthermore, at previous jobs, I have always had a DBA or someone who knew much more than me about these things. At this new job I just started, I've been asked to develop a public-facing application with a MySQL backend and the data stored by this application is expected to grow very rapidly. Oh, and we don't have a DBA. Well, I guess I am the DBA. ;) As far as designing a database to be scalable, I don't even know where to start. Does anyone have any good tips or know of any good educational materials for a developer who has been sort of shoved into a DBA/database designer role and has been tasked with designing a scalable database to support an application like this? Have any other developers been through this sort of thing? What did you do to quickly become good at this role? I've found some good slides on the subject here but it's hard to glean details from slides. Wish I could've attended that guy's talk. I also found a good blog entry called 5 Ways to Boost MySQL Scalability which had some good information, though some of it was over my head. tl;dr I just want to make sure the database doesn't have to be completely redesigned when it scales up, and I'm looking for tips to get it right the first time. The answer I'm looking for is a "list of things every developer should know about making a scalable MySQL database so your application doesn't perform like crap when the data gets huge".

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  • Is order of parameters for database Command object really important?

    - by nawfal
    I was debugging a database operation code and I found that proper UPDATE was never happening though the code never failed as such. This is the code: condb.Open(); OleDbCommand dbcom = new OleDbCommand("UPDATE Word SET word=?,sentence=?,mp3=? WHERE id=? AND exercise_id=?", condb); dbcom.Parameters.AddWithValue("id", wd.ID); dbcom.Parameters.AddWithValue("exercise_id", wd.ExID); dbcom.Parameters.AddWithValue("word", wd.Name); dbcom.Parameters.AddWithValue("sentence", wd.Sentence); dbcom.Parameters.AddWithValue("mp3", wd.Mp3); But after some tweaking this worked: condb.Open(); OleDbCommand dbcom = new OleDbCommand("UPDATE Word SET word=?,sentence=?,mp3=? WHERE id=? AND exercise_id=?", condb); dbcom.Parameters.AddWithValue("word", wd.Name); dbcom.Parameters.AddWithValue("sentence", wd.Sentence); dbcom.Parameters.AddWithValue("mp3", wd.Mp3); dbcom.Parameters.AddWithValue("id", wd.ID); dbcom.Parameters.AddWithValue("exercise_id", wd.ExID); Why is it so important that the parameters in WHERE clause has to be given the last in case of OleDb connection? Having worked with MySQL previously, I could (and usually do) write parameters of WHERE clause first because that's more logical to me. Is parameter order important when querying database in general? Some performance concern or something? Is there a specific order to be maintained in case of other databases like DB2, Sqlite etc? Update: I got rid of ? and included proper names with and without @. The order is really important. In both cases only when WHERE clause parameters was mentioned last, actual update happened. To make matter worse, in complex queries, its hard to know ourselves which order is Access expecting, and in all situations where order is changed, the query doesnt do its intended duty with no warning/error!!

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  • MS Access Premiere Products Exercise

    - by rynwtts
    I am working with Microsoft Access, Premiere Products Exercises for a college course. I can't seem to get past a specific question. We are working with DBDL and E-R Diagrams. The question is here. Indicate the changes you need to make to the design of the Premiere Products database to support the following situation. A customer is not necessarily represented by a single sales rep but can be represented by several sales reps. when a customer places an order, the sales rep who gets the commission on the order must be one of the collection of sales reps who represents the customer. In the database already each customer is represented by a sales rep. Which yields a one to one relationship. I need to enable a customer to have several sales reps, and make it so that only those sales rep will be eligible for commission upon each order.

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  • Wireless Access Point - Can't ping other machines on the wireless network

    - by Surfer513
    I have a wireless access point (Netgear), and I have it setup so that it has an IP address in the current subnet (let's say 192.168.2.0, subnet mask of 255.255.255.0). The machine that it is connected to via ethernet cable has an IP in the same subnet as the AP. The machines that are connected to the AP via the wireless connection also have an IP address in the same subnet as the rest of the network (192.168.2.0). All machines can ping the access point, but they cannot ping each other. I don't totally understand why, because there is connection and all of the machines are in the same subnet. I realize this is a layer 3 device, but is there an issue because of this AP's lack of gateway capabilities? (i.e. no routing table, etc.)

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  • Total newb having SSH tunnel and remote MySQL access problems

    - by kscott
    I don't often work with linux or need to SSH tunnel into remote MySQL databases, so pardon my ignorance. I'm using Windows 7 and am needing to connect to a remote MySQL instance on a Linux server. For months I had been using the HeidiSQL client application successfully. Today two things happened: the DB moved to a new server and I updated HeidiSQL, now I cannot log in to the MySQL server, when attempting I get this message from Heidi: SQL Error (2003) in statement #0: Can't connect to MySQL server on 'localhost' (10061) If I use Putty, I can connect to the server and get MySQL access through command line, including fetching data from the DB. I assume this means my credentials and address are correct, but do not understand why putting those same details into HeidiSQL's SSH tunnel info won't work. I also downloaded the MySQL Workbench and attempted to set up a connection through that client and got this message: Cannot Connect to Database Server Your connection attempt failed for user 'myusername' from your host to server at localhost:3306: Lost connection to MySQL server at 'reading initial communication packet', system error: 0 Please: 1 Check that mysql is running on server localhost 2 Check that mysql is running on port 3306 (note: 3306 is the default, but this can be changed) 3 Check the myusername has rights to connect to localhost from your address (mysql rights define what clients can connect to the server and from which machines) 4 Make sure you are both providing a password if needed and using the correct password for localhost connecting from the host address you're connecting from From Googling around I see that it could be related to the MySQL bind-address, but I am a third party sub-contractor with no access to the MySQL settings of this box and the system admin is assuring me that I'm an idiot and need to figure it out on my end. This is completely possible but I don't know what else to try. Edit 1 - The client settings I am using In Heidi and MySQL Workbench I am using the following: SSH host + port: theHostnameOfTheRemoteServer.com:22 {this is the same host I can Putty to} SSH Username: mySSHusername {the same user name I use for my Putty connection} SSH Password: mySSHpassword {the same password for the Putty connection} Local port: 3307 {this is on the SSH settings tab and was defaulted to 3307 by Heidi, changing it to 3306 gives me a different error: SQL Error (1045) in statement #0: Access denied for user 'mySQLusername'@'localhost' (using password: YES)"} MySQL host: theHostnameOfTheRemoteServer.com {consensus seems to be I should use 'localhost' here} MySQL User: mySQLusername {which I can connect with once in with Putty} MySQL Password: mySQLpassword {which works once in with Putty} Port: 3306

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  • Not able to access other machines on network

    - by TheVillageIdiot
    Hi I'm running Windows 7 Enterprise (32bit) on my laptop. For some time I'm not able to access other machines using \\192.168.xxx.xxx. I've installed VM Ware player on my machine few days back but I don't remember if it happened just after that or there is some other reason behind it. EDIT:- I've disabled VMWare Bridge Protocol but still no effect. Please help me. PS:- I've used both wireless and wired networks. Network sharing is enabled and I can ping other machines but cannot access network shares. I get following message: \\xxx.xxx.xxx.xxx You might not have permission to use this network resource. Contact the administrator of this server to find out if you have acess permissions. The request is not supported. EDIT (2):- Network Discovery, File and Printer Sharing, Folder sharing are all on.

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  • [SOLVED]Need help with remote dekstop - Limit the computers you can access server from

    - by stirredo
    I have a windows server 2003 computer that is accessed by remote desktop connection. To access the server all you need to know is the IP address of the computer. I want to limit the computers that can access the windows server computer to authorized computers only. The authorized computers won't have static IPs, so I cannot limit them on basis of IP address. Can I limit them on basis of MAC id perhaps? I won't mind using third party solution like Teamviewer or Logmein etc. So How can I solve this problem? EDIT: Found a possible solution in team viewer. Team viewer creates a unique partner ID for the computer it is installed on. It has an option for allowing only authorized partner IDs to access the computer. Problem solved.

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  • Will I be abled to access 2nd HDD from dual-boot

    - by Ruben
    I'm planning to have a dual-boot on my computer. I have 2 physical hard drives, one 500GB and one 2TB. What I want to do, is have a dual-boot setup (2 partitions, both 50 GB) for Windows 8 and Windows 7. But will I be able to access the 3rd partition on the disk, or the other disk from both OSs? In this case, it would be really useful to access files and install programs, because I could use them on both OSs, as long as I have the same registry keys.

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  • access VPN machine macosx same subnet

    - by matheszabi
    I would like to access the office machine, which has a fixed IP, and is available only in its local LAN. Let say 192.168.1.100. I have a VPN with username/password connection and I am trying to access the office machine from another location, i.e., another LAN, which has the same subnet: 192.168.1.50. I am using MacOSX 10.8. I have checked the "send all trafic over VPN connection, but I think it looks like it doesn't care and is searching in Local. I do not have admin privileges and can't request to make changes to the network settings in both LANs. Is there any way to connect to the desired remote machine?

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  • Cannot write to registry while installing Microsoft Access 2010 - Error 1406

    - by Rillanon
    While installing I get an error: Microsoft Access 2010 encountered an error during setup. Error 1406. Setup cannot write the value to the registry key \Software\Classes\Interface{000C036F-0000-0000-C000-000000000046}\ProxyStubClsid. Verify that have sufficient permissions to access the registry or contact Microsoft Product Support Services (PSS) for assitance. I went to regedit to check on the key that the error was talking about but when I clicked on it it says file not found. I'm using 64bit Windows 7 Ultimate. Any ideas?

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  • Access denied on file system for System Administrator

    - by NLV
    Hello Yesterday I got win32.Saltiy virus and did some damage before my Kaspersky suite caught it. Now I've cleaned all the viruses using Kaspersky but I believe the changes it did to the registry/policies are still there. I'm not able to have write access on the entire file system. It is showing up the access denied the error. I'm in the local system administrators group. I've tried removing and re-adding it (with a reboot). But still no luck. Any ideas on how can I fix this?

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  • Not able to access other machines on network

    - by TheVillageIdiot
    Hi I'm running Windows 7 Enterprise (32bit) on my laptop. For some time I'm not able to access other machines using \\192.168.xxx.xxx. I've installed VM Ware player on my machine few days back but I don't remember if it happened just after that or there is some other reason behind it. EDIT:- I've disabled VMWare Bridge Protocol but still no effect. Please help me. PS:- I've used both wireless and wired networks. Network sharing is enabled and I can ping other machines but cannot access network shares. I get following message: \\xxx.xxx.xxx.xxx You might not have permission to use this network resource. Contact the administrator of this server to find out if you have acess permissions. The request is not supported. EDIT (2):- Network Discovery, File and Printer Sharing, Folder sharing are all on.

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  • ms access template where to find the vb code

    - by tintincutes
    I'm very new to this ms access 2007. I have a copy of a charitable contribution template charitablecontributions.accdb. I would like to know where I can find the code of it? I opened it by holding down the shift button and double click on it and it will open to a normal ms access where you can modify the table and so. But when I just click the file: charitablecontributions.accdb it will open to a formular view where the ribbon bars are gone. I wanted to know how, how is it possible to have this formular view? Because I have a Test.mdb from 2003 and I also would like it to be open like the formular view of charitablecontributions.accdb. I'll appreciate your help. Thanks

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  • MS Access Query Criteria Issue

    - by xxl3ww
    Currently I have a MS Access database query that has a field named FedEXDetTotal that totals 9 FedEX charge fields. I have another field that is from our inhouse system called "Total Charge". This is just a normal number field. I have created another Field in this query Diff: [FedEXDetTotal]-[Total Charge] This tells me the difference between the Fedex charge and what we actually charged. Everything works OK with this, but when I try to put the criteria 5 for the Diff field, when I run the query, I get a prompt saying "Enter Parameter Value FedEXDetTotal". Why is Access doing this? How do I get around this? I'm trying to start out with something simple(5), but what I really want is [Forms]![Dis].[txtbox_Diff].

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  • ms access template where to find the vb code

    - by tintincute
    Hi I'm very new to this ms access 2007. I have a copy of a charitable contribution template charitablecontributions.accdb. I would like to know where I can find the code of it? I opened it by holding down the shift button and double click on it and it will open to a normal ms access where you can modify the table and so. But when I just click the file: charitablecontributions.accdb it will open to a formular view where the ribbon bars are gone. I wanted to know how, how is it possible to have this formular view? Because I have a Test.mdb from 2003 and I also would like it to be open like the formular view of charitablecontributions.accdb. I'll appreciate your help. Thanks

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  • Write permissions denied on linked tables between MS Access 2003 and 2007

    - by STEVE KING
    We are in the process of switching over to Access 2007. We have numerous data tables in Access 2003 files. In one case, the user has 2007 on his PC and opened the front end in 2007. No problems. When the the user is done, he clicks a button that executes a macro full of update queries. The macro reaches the first query and halts. We get a message saying we do not have permissions to write to this linked table (2003 format). There were no security files involved. We re-linked from 2007, same problem. LAN permssions were ok. I wound up having to import the tables to front end in order for the user to be able to do his job.

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  • No remote access to PostgreSQL db

    - by gattol
    i'm stuck in connecting to a PostresSQL database from remote host. The server is accepting incoming connections on port 5432 and i've configured pg_hba.conf like this: local all all md5 host all all 0.0.0.0/0 md5 and the postgresql.conf like this: listen_addresses = '*' port = 5432 max_connections = 100 I don't have any problem accessing from local but when i try to connect via psql with something like this: psql -U myuser -h hostname db_name I get this error: psql: FATAL: no pg_hba.conf entry for host "87.zz.yy.xxx", user "myuser", database "db_name", SSL off I also tried to put the host 87.zz.yy.xxx in the pg_hba.conf file without success.

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  • Need help with remote dekstop - Limit the computers you can access server from

    - by stirredo
    I have a windows server 2003 computer that is accessed by remote desktop connection. To access the server all you need to know is the IP address of the computer. I want to limit the computers that can access the windows server computer to authorized computers only. The authorized computers won't have static IPs, so I cannot limit them on basis of IP address. Can I limit them on basis of MAC id perhaps? I won't mind using third party solution like Teamviewer or Logmein etc. So How can I solve this problem?

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  • Copy data from Access to the next row in Excel

    - by edmon
    I have a MS Access database for a small Hotel. On the main form I have Guest Information fields...(Name, Address, Phone#, etc). I also have an Excel file that keeps track of bookings for the Hotel. The following code takes the Guest information from my form in Access and populates the labeled cells in my Excel file. Dim objXLApp As Object Dim objXLBook As Object Set objXLApp = CreateObject("Excel.Application") Set objXLBook = objXLApp.Workbooks.Open("Y:\123files\E\Hotel Reservation.xls") objXLApp.Application.Visible = True objXLBook.ActiveSheet.Range("B2") = Me.GuestFirstName & " " & GuestLastName objXLBook.ActiveSheet.Range("C2") = Me.PhoneNumber objXLBook.ActiveSheet.Range("D2") = Me.cboCheckInDate objXLBook.ActiveSheet.Range("E2") = Me.cboCheckOutDate objXLBook.ActiveSheet.Range("G2") = Me.RoomType objXLBook.ActiveSheet.Range("H2") = Me.RoomNumber End Sub Is there a way to, move to the next row in my Excel file, for a new guests info? EX. I take my first guests info and it populates row 2 of my Excel file. For my next guest it will populate row 3 of my Excel file and so on....

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  • split a database web application - good idea or bad idea?

    - by Khou
    Is it a bad idea to split up a application and the database? Application1 uses database1 on ServerX Application2 uses database2 on ServerY Both application communicates over web service API, they are apart of the same application, one application is used to manage user's profile/personal data, while the other application is used to manages user's financial data. Or should just put them together and just use 1 database on the same server?

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