I am creating a software for my client in PHP and MySql, The software will be running in the local network, the software should also run in online that is all the data should be viewed online, i would like to know is there a way to update the mysql database from local to online whenever the internet is connected, if the internet is not connected all the data will be stored in local mysql server. they wont be adding any data in the online server and they will only view the contents. Kindly help me in this
It sounds like you are looking for a way to have a read-only, "online" (assuming WAN) MySQL server which is updated from a read-write, "offline" (LAN) MySQL Server which is updated by your users.
If that's the case, you may want to consider a Master/Slave MySQL Replication configuration:
http://www.rackspace.com/knowledge_center/article/mysql-replication-masterslave
you can run a cron job in your local server which monitor and upload data to online server when internet is available. You need to track (set a status) which data is uploaded which not for synchronization
Setup replication between your mysql databases. The local network database would be the slave and the web server would be the master.
See http://dev.mysql.com/doc/refman/5.5/en/replication-howto.html for setting up replication.
I would suggest you setup master/slave replication.
I would make the local server the master and the internet server the slave.
However, if you are using a common shared hosting service, I am not too sure if you have permission to setup such DB replication structure.
Tryhttps://www.digitalocean.com/community/articles/how-to-set-up-master-slave-replication-in-mysql. However, with the mysql versions pre 5.6 (I think) you can't delay the replication from a predefined interval. However, http://alexalexander.blogspot.com/2013/03/mysql-slave-delay-how-to.html suggests using something called a percona tool kit. I haven't used it though.
Related
I'm using Curl to send information between local and remote MySQL databases in order to keep them synchronised.
Each row that is sent keeps record of wether or not it has been updated in the central database, and keeps a record of the central database id for its transaction.
Is there a better way to keep many local databases synchronised with a central remote server?
PS I cannot use database replication because of shared hosting server restrictions.
You have not really answered Alfallouji's question. Nor have you said anything about any of the contraints to your approach.
You said you want to replicate the data somewhere else, when the primary database is the hosted solution. What access is there to 'somewhere else' from the hosted server? Does somewhere else have a static IP address? Is it always up?
Can you access the binary log on the primary server?
How much replication lag can you accomodate?
There are lots of solutions.....mysql_proxy, mysql's built-in asynchronous replication (optionally with manual copying of replication logs). Multi-master replication. Or at the device level with DRBD, or write a custom dump tool and rsync the results.....
I have a simple MySQL database (one table with 12 rows of data and 5 columns) sitting on the web-server of my host provider.
On my home PC I create the data programmatically and store it in a free version of SQL Server (on my home PC). I would like to "upload" this data to the MySQL db in real time (or as close as I can get) over the internet (I'm assuming this is the only way to connect the pipes).
I know that opening up a MySQL database to a remote internet connection probably is not a "secure" thing to do, but the resulting data table will be publicly available anyway via an "app" so I'm not too worried about that (I suppose a hacker could "overwrite" my data with their own if they were both industrious and inclined) but I think the risk/reward is so small its not a major concern.
Anyway, what is the easiest way to do this with some semblance of security? I only know how to program in VB (I did a little HTML and ASP back in the day, but that was a long time ago). I could learn a few lines of code in another language if need be.
I do not have a static IP, and I've never actually interacted with a MySQL database before (only SQL server, so my MySQL knowledge/ familiarity is zero...but a db is a db, so how hard can it be?). Because of my home network firewall, I can't allow connections "in". I will have to make the connection to the MySQL db "out" from my home PC --> to the hosted database.
Ok this problem is not actually super simple.
What you will find is most shared hosting providers do not allow just any IP to access their databases.
Solution? set the IP for your computer of course! BUT.....you are probably on home internet connection so your IP address can CHANGE (if you have a static IP you are a lucky person!)
So the best way - create a mini-API!
Basically, you want to post your data to a script (with some security of course) that then inserts this data into the database.
It is a lot of work but having done all this before it seems to be the only way unless you have a dedicated server / advanced access privileges!
You could take a look at WAMP for your home pc. It's simple to use.
And then you should take a look at Mysql remote connections(some details here)
I would try this:
At your local computer install MySQL server, there's a free community
edition available for download, try the web installer since its more lightweight. Use the
custom installation and make sure MySql Workbench is selected too.
Workbench has a migration tool for the most common databases, Try this locally, so you can tell if all your data is correctly migrated from your local SQL Server to a MySQL db and there are no data losses in the process.
Then, You could probably connect through Workbench to your online MySQL db
and migrate your data to it directly from your just created local db. In case you cannot connect, make a backup of your local db and send the files to
your server by ftp or similar process. Then, simply restore DB from the backup file on your
online server.
Hope this helps!
Situation:
Php application with mysql database running on 2 sites
online -static ip X.X.X.X
localhost (not online most of time and dynamic ip)
application traffic is usually low <10 users.
what i need is that whenever a change is done to the online database, this change is pushed to localhost -if its online or when ever its available- and vise versa (any changes done locally is uploaded online to database when ever there is online connection).
is it possible to setup such replication by mysql ? or do i need to write a custom PHP that ping master server and once its available
thanks very much :).
Yes you can do this with replication. Just pick which server you want to be the master and have the second one send all of its changes to the main one then the main one could send its changes back.
Replication can be a bit daunting to set up but once its up and running its grate. http://dev.mysql.com/doc/refman/5.0/en/replication-howto.html
Let's first analyze your question:
The problem of accessing MySQL with a dynamic ip.
This is very easy. Once you installed MySQL on a server with an ever-changing IP, what you can do is go to NO-IP, DynDNS or any other Dynamic DNS service and register for free with them. Once you've registered with them, you would get a client for your operating system. Install that and then you can access your MySQL server using a domain name.
Example:
Instead of having to access your server at 127.0.0.1, you can access it as mysql-server.easynet.net etc.
Now the second and albeit complex part of your question, how to do available and lazy replication.
This is relatively a bit more complex than the previous step. But, what actually happens is that you have to choose a scheme of replication. Basically what you are looking for here is MASTER-MASTER replication since you have a possibility of changes happening at both the MySQL servers. Thus the updates need to be bi-directional, that's what this scheme of replication does. How to do it? Well, I am providing the links which I've found easier to follow:
Master-Master Replication
Step-by-step MySQL Master Replication
I hope that would ease your plight and answer your question!
Cheers!
Sure, you can
You need to setup both MySQL servers as Master and Slave at the same time.
Configure the online server as Master, and the localhost server as slave, and once replication is OK.
Configure the localhost as Master and the online server as slave.
I already did that on two servers.
About the dynamic IP on the local host, simply you can use any dynamic IP service like: no-ip, and use the dns name instead of the IP.
Here's a post i've written (in french, but you can get the configuration snippets from it) for setting up a MASTER-MASTER replication with a load balancer (mysql proxy) for balancing SQL queries between both nodes.
I have a local intranet application which runs off a basic WAMP server in our offices. Every morning, one of our team members manually syncs our internal mysql db with our external mysql db (where our online enrollments occur). If a change is made during the day on the intranet application, it is not reflected on the external db until the following day.
I am wondering if it is possible to (essentially) tunnel to an external mysql connection from say a wamp or xampp server from within our offices and work in 'real-time'.
Anybody had any luck or advice?
Yes
Replication enables data from one MySQL database server (the master) to be replicated to one or more MySQL database servers (the slaves). Replication is asynchronous - slaves need not to connected permanently to receive updates from the master. This means that updates can occur over long-distance connections and even over temporary or intermittent connections such as a dial-up service. Depending on the configuration, you can replicate all databases, selected databases, or even selected tables within a database.
If you use the external server directly, performance is likely to suffer. A Gigabit LAN might be a thousand times faster than your Internet connection - particularly the upload speed of an ADSL connection.
Just make your internal application use the database from the external one. You may need to add permission to the external server to allow connections from your internal server IP, but otherwise this is just like having a webserver and sperate db server that need to access each other.
Can't really tell you how to do this here - it all depends on your specific configuration, something that I would thing is a little complicated (and too specialized) to figure out on SO.
How it is possible to update localhost MySql database with server mysql database at particular interval. Web application is made in PHP and database should be in MySql.
Suppose I have a Database at Hosting site Now i want to update my database at regular interval with Local Host Database at my Local Computer.Please suggest me ??
Sounds like you need to use MySQL's replication feature. Here's a walkthrough and here's the manual for reference.
It's worth noting that replication over the internet (rather than a local network) can be slow and you can end up with a slave that's minutes, even hours behind a busy master. Another option could be to periodically mysqldump the master database and copy it back to your local machine, although if your master is very busy you'll lock databases and hang queries, and if it's very large this process will take a long time.