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• Ruby on Rails - How to migrate code from float to decimal?

  - by user1723110

  So I've got a ruby on rails code which use float a lot (lots of "to_f"). It uses a database with some numbers also stored as "float" type. I would like to migrate this code and the database to decimal only. Is it as simple as migrating the database columns to decimal (adding a decimal column, copying float column to decimal one, deleting float column, renaming decimal column to old float column name), and replacing "to_f" with "to_d" in the code? Or do I need to do more than that? Thanks a lot everyone Raphael

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• Is it faster to create indexes before or after data loading in MySQL?

  - by Josh Glover

  I have a data replication process that drops and recreates a few tables in a target database, then loads them up with data from a source database (running on another host, but that is immaterial to the question at hand). The target database does need primary keys and a few other indexes on its tables, but not during the data loading. I'm currently loading all of the data, then creating the indexes. However, index creation takes a pretty long time--30 minutes of my data loader's 5 and a half hour running time. My intuition tells me that creating the indexes at the end should be faster than creating them first, since the index would need to be rewritten with each insert. Can anyone tell me for sure which way is faster? FWIW, I'm running MySQL 5.1 with InnoDB tables.

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• Sql Server 2008 Create Foreign Key Manually

  - by tgriffiths

  I have inherited an old database which wasn't designed very well. It is a Sql Server 2008 database which is missing quite a lot of Foreign Key relationships. Below shows two of the tables, and I am trying to manually create a FK relationship between dbo.app_status.status_id and dbo.app_additional_info.application_id I am using SQL Server Management Studio when trying to create the relationship using the query below USE myDatabase; GO ALTER TABLE dbo.app_additional_info ADD CONSTRAINT FK_AddInfo_AppStatus FOREIGN KEY (application_id) REFERENCES dbo.app_status (status_id) ON DELETE CASCADE ON UPDATE CASCADE ; GO However, I receive this error when I run the query The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_AddInfo_AppStatus". The conflict occurred in database "myDatabase", table "dbo.app_status", column 'status_id'. I am wondering if the query is failing because each table already contains approximately 130,000 records? Please help. Thanks.

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• Best practice for ONLY allowing MySQL access to a server?

  - by Calvin Froedge

  Here's the use case: I have a SaaS system that was built (dev environment) on a single box. I've moved everything to a cloud environment running Ubuntu 10.10. One server runs the application, the other runs the database. The basic idea is that the server that runs the database should only be accessible by the application and the administrator's machine, who both have correct RSA keys. My question: Would it be better practice to use a firewall to block access to ALL ports except MySQL, or skip firewall / iptables and just disable all other services / ports completely? Furthermore, should I run MySQL on a non-standard port? This database will hold quite sensitive information and I want to make sure I'm doing everything possible to properly safeguard it. Thanks in advance. I've been reading here for a while but this is the first question that I've asked. I'll try to answer some as well = )

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• Lotus notes 8.5 quota

  - by Cividan

  we're using lotus notes 8.5 and I have a user who was over his quota as he had sent 6 email with attachement over 800 MB (no comment...) I deleted these oversized email and empty the trash but domino keep sending email warning about quota. I checked in the all documents view and they are no longer there, I re-did an empty the trash. I saw a post on the internet saying to compact his database, when I go under file, application, properties and click on the info tab, I see that he use 35.7% of the 3 GB database. when I click on "compact" I see a message saying the compact of the database is beeing process... the message disapear after about 1 minutes the message disapear but nothing else seem to happen and when I look back later on the space problem has not changed. any advice would be appreciated.

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• Samba users not added untill they logon first? Edit: How do I add users to tdbsam without a password prompt?

  - by glisignoli

  I add users to my server with the command useradd -m -p PASS_HASH -s /usr/sbin/nologin USERNAME Then I try to access their samba home share, but it never shows up until I login with the user: root:~$sudo login failtest Password:###### Added user failtest. Is there some way of added the user without logging in? Edit: The problem is that the user is added with the useradd command, but ubuntu seems to run an initalisation script when the user logs on for the first time. This script then adds that user to the tdbsam user database. Finding the initalisation script or the method it uses to add a user to the tdbsam database without requiring any user input (as smbpasswd -a USER prompts the user for a password). So all I need is a way to add a user+pass to the tdbsam database without prompting a user for a password (eg: samaba-add-user.sh USERNAME PASSWORD).

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• Connecting SQL 2005 to Oracle 10g

  - by Lorn

  Environment: - Oracle 10g database over a windows 32bit 2003 server - SQL 2005 database over a windows 32 bit 2003 server. I am trying to connect the above databases through heterogeneous services. I have updated the following files: TNSNames.ora, Listener.ora and hs.ora. When performing a test connection from SQL developer, I get the following error - ORA 28500 - indicating that the login for SA user is incorrect. I also tried using another authenticated user that has rights to the database. I can successfully connect with SQL 2000. Has anyone experienced such a problem before?

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• MySQL gzipped Export in PhpMyAdmin has wrong size in Mozilla

  - by Michal Gow

  That is really strange. I am using PhpMyAdmin 2.11.9.6 on Linux hosting. While I am Exporting databases using "gzipped" compression in Mozilla, I am getting files which have size of uncompressed database, but they seems to be downloading in incredible speed (10 times quicker than is possible using my ISP). So at the end: for database of 10M size I am getting 10M gzip downloaded in miniseconds it has indeed shown 10M size on drive it is corrupted Zip compression is working just fine (I am getting file with cca 1M size with fine content of compressed database) And the weirdest thing: that is happening for Mozilla Firefox (13.0.1) only, Internet Explorer 9 is downloading correct gzipped files... Any hint?

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• Keep Uploaded Files in Sync Across Multiple Servers - LAMP

  - by Dfranc3373

  I have a website right now that is currently utilizing 2 servers, a application server and a database server, however the load on the application server is increasing so we are going to add a second application server. The problem I have is that the website has users upload files to the server. How do I get the uploaded files on both of the servers? I do not want to store images directly in a database as our application is database intensive already. Is there a way to sync the servers across each other or is there something else I can do? Any help would be appreciated. Thanks

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• Using Postgres on Volusion site

  - by Sean

  Okay, I apologize if this is so basic that I should know the answer, but I'm not sure where else to go for the solution. I would like to start a small store site using Volusion. I would like some custom ASP code to query data that I currently have in a Postgres database. I would like to be able to just move the database file(s) onto the Volusion server via ftp and access them from my store site (via the custom ASP). Do I need to install Postgres onto the server to do this, or can I just ftp my database file(s) and access them with the ASP code? I think I need to install Postgres, but would like to do this without such an installation if possible.

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• Is the sql backend right choice for LDAP?

  - by skomak

  Hi, I have felt some troubles with LDAP dif database after unexpected system reboots. This databse was only read so it is confused why database have had errors. So im searching for replacement of this database. I think SQL would be more reliable. What do you think, is it? I need to know how much performance loss i'll meet then. How many more IOPS(I/O per second) in percentage I loss too. Thanks in advance, skomak

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• Postgres backup

  - by Abbass

  Hello, I have a Bacula script that does an automatic backup of a Postgres Database. The script makes two backups using (pg_dump) of the data base : The schema only and the data only. /usr/bin/pg_dump --format=c -s $dbname --file=$DUMPDIR/$dbname.schema.dump /usr/bin/pg_dump --format=c -a $dbname --file=$DUMPDIR/$dbname.data.dump The problem is that I can't figure out how to restore it with pg_restore. Do I need to create the database and the users before then restore the schema and finally the data. I did the following : pg_restore --format=c -s -C -d template1 xxx.schema.dump pg_restore --format=c -a -d xxx xxx.data.dump This first restore creates the database with emtpy tables but the second gives many error like this one : pg_restore: [archiver (db)] COPY failed: ERROR: insert or update on table "Table1" violates foreign key constraint "fkf6977a478dd41734" DETAIL: Key (contentid)=(1474566) is not present in table "Table23". Any ideas?

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• Repairing a TFS 2005 install or starting anew.

  - by Johan Buret

  Following : Installing Team Foundation Server on a shared database instance We did use a shared database instance setup for TFS 2005, and that was not a good idea, because of the Reporting Service dependency. The reporting instance on the server gives error code 404. What works now Basic source code control. We're able to check in and out source code. What doesn't work : Everything else, including : Opening and creating new team projects. Build automation. Internal bug tracking. Goal setup Having a fully working TFS install, and keeping the history. 1) A full install of TFS 2005 on the same server, but within its own database and reporting instance. 2) Using another server might be an option, but it's really not prefered Downtime should be minimum, my colleagues needs to be able to work on the source Readings I've read the MSDN page about moving/restoring TFS 2005, but I'm still unsure about what to do. Thanks in advance for help

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• When to use MySQL replication or DRBD for HA on Xen VM?

  - by user62513

  I'm setting up a database which needs to be needs to provide High Availabilty. My primary concern is high performance and robustness (I don't want something that will fail fast and badly). The database is accessed by the application at an average of 300 qps. It's will run on Xen VMs and it has some InnoDB tables as well as MyISAM tables. The VMs are connected via ethernet 100Mbit/s ethernet cables. Which of the two - MySQL replication or DRBD - would you recommend in such a situation? Or should I use DRBD to make the master database Highly Available and use MySQL replication on the slaves? I'm a developer so these things are all not so easy for me to make a sound judgement.

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• SQL Server 2005/2008 Licensing Decision

  - by Hakim

  Hello, I have purchased a dedicated server from a reputable Hosting company. They only have Windows Server 2008 OS installed on it and NO Sql server. Server Configuration is Intel Dual core Processor with 2GB of RAM and 100GB HDD. I wanted to host my web services on that server which will be using the MS SQL Server 2005 at the backend.There are multiple web services and each using a different Database. Microsoft has CAL basis Licensing , Which I understand is based on number of users accessing the database directly ( I may be wrong ) . But my users will be accessing the webservice and no direct connection to the database as such. Yes but the number of users accessing the web server cannot be known and is not under my control. Which Licensing is best suited for this kind of setup ? I don't need analysing and BI services right now ,but i may want to upgrade that in future may be. Any help will be appreciated. Thanks

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• Mediawiki create user error after migration

  - by ing0

  So I had a mediawiki installed on windows with MySQL (running on AWS RDS). I've since moved it to a debian server for various reasons, but I think I've messed up the database because of the different versions of mediawiki I have used. The windows install was v 1.20alpha (58f390e). The new debian install is v 1.15.5-2squeeze4. I've tried to update debian but it doesn't find an update, so is this the latest squeeze version? Everything seems to work ok except adding users. It gives me a database error so I ran php maintenance/update.php which ran some stuff OK but didn't make a difference. I think I've not done the correct approach to this sort of move, does anyone know of a better way of doing it? I still have the old wiki running - but not used - on windows (using the same database) so I could always try this again.

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• Migrating Magento Concern

  - by Pankaj Upadhyay

  We have a Magento 1.5.0.1 store running at a hosting provider. Now, we need to migrate the same from that server to a new hosting provider. I had talk with a technical guy from the new hosting provider who told me to do following things. Go into the cPanel Backup Wizard . Make a FULL BACKUP and download the zip file Then upload that zip file on their server in my root folder. Then tell them and they will do the restore. My Concern :- Will everything work as expected. What about the connectionstrings and database and all. Will database be automatically created and work the same. Also, somewhere I read that ver 1.5.0.1 used older type of database which might not work on new MySQLs. Can this too have any impact. Should i proceed in the same manner or I need to take care of some additional things to ensure smooth running.

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• Facing difficulty with migrating from wordpress to Drupal

  - by rakibtg

  One of my blog was build of Wordpress but now i want to use Drupal as the CMS of my Blog. To do so I have deleted all the Wordpress files from my server and the Database and MySQL user which are associated with wordpress blog and uploaded the Drupal files in my server directory where the wordpress files were. But, when i have opened the blog it shows the Wordpress blog! though its been deleted and their should be the Drupal Installation interface. So, i have re-checked my server directories and database, there is not wordpress files and wp database all are deleted, there is only the drupal files, but when i go to the blog to install drupal there is still the Wordpress blog, I have checked the blog in many web browsers and there is not cache memory problem. My hosting server is linux based. can't understand what to do? Any idea? Thanks

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• MySql transfer / update (a bit specific)

  - by Jeff

  before posting I was digging whole site but didn't find help for my problem, so I hope someone will help... Facts: 30 Gb mysql database on remote server (about 20.000.000 rows) data are once weekly updated in local network (mysql) I need to transfer/replace local updated database with remote connection is about 2mb (real mb, not mbps) up/down Point is that I can't have 'down time' of remote mysql server. Until now I Tried: navicat data sync - Ok, but take about 3 days to finish dbForge - ok but need 5 days to finish mysql dump transfer to remote server and execution - about day, but a lot of downtime rsync folder with database /mysql/lib/MY_DATABASE - 4 hours, but after that I need to execute always 'repir on remote server' which takes about 2 hours, and a lot of down time mysql dump piped from cl to directly goto server - still now satisfied many problems I could give you more things that I tried... mysql replication - slow Anyase, what is best,best way to: refresh remote mysql on weekly level and in same time to have 0 sec down time nor huge server load If you have any idea please share

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• Solaris 10: Identify a PID and the CPU it's running on

  - by Marcus

  I have multiple instances of a database running on a Solaris system. I'd like to prove that each database process is being handled by a different CPU. Essentially, I want to be able to do something like a ps -ef | grep <process_name> to get the PIDs and then run another command (if required) to identify the CPU... Is prstat able to do this? I'm making an assumption that as each database instance is started each one uses a different CPU. I'm not sure if I'm understanding this correctly... The reason I want to do this is because Sun hardware has slow CPU's, but lots of them. Therefore, to get the best performance out of it, I need to try and spread the load among CPU's... Thanks

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• Solaris 10: Identify a PID and the CPU it's running on

  - by Marcus

  I have multiple instances of a database running on a Solaris system. I'd like to prove that each database process is being handled by a different CPU. Essentially, I want to be able to do something like a ps -ef | grep <process_name> to get the PIDs and then run another command (if required) to identify the CPU... Is prstat able to do this? I'm making an assumption that as each database instance is started each one uses a different CPU. I'm not sure if I'm understanding this correctly... The reason I want to do this is because Sun hardware has slow CPU's, but lots of them. Therefore, to get the best performance out of it, I need to try and spread the load among CPU's... Thanks

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• User mapping lost after manual failover

  - by fordan

  I have two Microsoft SQL Server instances set up for mirroring each with a number of databases. There are a number of logins and for each database one or more user/login mappings. When I restore a backup of database I always have to redo the login/user mappings. I understand this because the logins are per database server. So after restoring the databases on the pricipal I redid the login/user mappings. This was not possible for the mirror because the databases were 'restoring'. After a manual failover I could not use the databases because user credentials were missing. This was not unexpected, so I did the login/user mapping again. I did a manual failover again to make the initial pricipal, which was now the mirror, principal again. To my surprise I could not use the databases because the login/user mappings were gone. Is this the expected behaviour?

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• How much visitors could handle my server ?

  - by coolboycsaba

  I have a website, and I want to host it on my own computer, but I'm wondering if it's good enough. The website check`s if the user is logged in and then displays 15 items (title, description) from a mysql database and the rating (stored in another database) and the comments (another database) for each item. It also displays some stats (number of items, comments). I also have an image for each item. My specs are: AMD Athlon 64 X2 Dual Core Processor 5600+ 2.90 GHz RAM memory: 4.00GB Windows 7 64bit So what do you think, how much visitors and items could it handle (at once or daily) ? My internet connection is good, around 7-10 mb upload and same download speed

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• Oracle backup and recovery

  - by kupa

  During recovery Oracle writes the following error: RMAN-06054: media recovery requesting unknown log: thread 1 seq 9 lowscn 4034762 I have used in mount mode this command: change archivelog all crosscheck; delete expired archivelog all; Then restore and tried to recover again:But still RMAN-06054 error.Than I wrote: run{ SET UNTIL SEQUENCE 9 THREAD 1; RESTORE DATABASE; RECOVER DATABASE; } It helped me to recover database...But after that when I do the backup and then recover the same error occurs and solution is the same... I wonder to solve this problem without SET UNTIL SEQUENCE 9 THREAD 1; maybe I should unregister this archive log from control file(I am using control file not catalog) Can you tell me how?

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• How many site visitors can my server handle? [closed]

  - by coolboycsaba

  I have a website, and I want to host it on my own computer, but I'm wondering if it's good enough. The website checks if the user is logged in and then displays 15 items (title, description) from a mysql database and the rating (stored in another database) and the comments (another database) for each item. It also displays some stats (number of items, comments). I also have an image for each item. My specs are: AMD Athlon 64 X2 Dual Core Processor 5600+ 2.90 GHz RAM: 4.00GB Windows 7 64bit So what do you think, how much visitors and items could it handle (at once or daily) ? My internet connection is good, around 7-10 mb upload and same download speed

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