My experience is with Engineering or design type databases rather than commercial/SQL type of databases, however the concept of data integrity is so fundamental that I would be very surprised if much would happen without being noticed!<br>
<br>In the case of MySql you are essentially running the same software in different environments - both the basic database server and the Admin tools - so I would expect any major issues to be a very rare things. <br><br>
Probably the best assurance of this is the MySql "market share", it is one of the most popular database systems in existence and is used in all kinds of environments (OS, hardware, networks, etc.) from simple standalone setups to massive distributed corporate "enterprise" systems. As a result I would expect that any common problems would be found and fixed very rapidly.<br>
<br>The kind of data loss caused by parts of a file being deleted could certainly occur, but there are very well known and widely used methods to detect and fix this kind of problem. My recollection is that the SQL "backups" from MySql have several built in mechanisms to check this.<br>
<br>Loss of some more subtle information such as a pointer to a specific texture (or your other examples) is more likely, however the application software would (SHOULD!) be the same version of OpenSim in both cases so this too is very unlikely. This however is a distinct possibility when upgrading from one version to the next regardless of the OS! <br>
<br>Since there are extensive changes made to the internal workings of OpenSim between V0.6.9 and V0.7.xx this becomes very plausible. It is the subject of a lot of the testing work being done on the current RCs as a result. Again I would expect that by the time V0.7 is released the major problems either fixed or well known. <br>
<br>All the same any grid that has more than a half dozen users will likely implement its own beta testing program to catch these problems in your specific environment. There always do seem to be a few issues brought to light in these tests! Not a problem if you only need to fix up two or three users (or regions) but if say 5000 users have their inventory corrupted then you have a major problem!<br>
<br>As always "slow and easy wins the race" and a well planned step by step migration is essential. <br><br>Karen<br><br><div class="gmail_quote">On Sun, Jul 11, 2010 at 6:28 PM, Chris Kennedy <span dir="ltr"><<a href="mailto:mewtwo0641@cox.net">mewtwo0641@cox.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000">
I do make seperate OAR and IAR backups along side my SQL dumps =)<br>
<br>
I was just wondering if there would be any definite data loss when
saving and restoring these SQL dumps across multiple platforms... or if
data loss would be a "freak" kind of thing (i.e. a bug in the My SQL
server or MySQL Admin when it comes to Linux or Windows, or
configuration differences between the default setup of the MySQL server
on Linux vs. Windows, etc). <br>
<br>
Would it be a noticeable thing if data loss did occur such as missing
inventory, or something more subtle that would take a bit of digging to
find; such as missing textures or even "blank" data (i.e. open a
texture and all you see is a white box where the texture should have
been. Or try to play an animation / sound from your inventory and it
won't play)?<br>
<br>
Thank you very much for the suggestions! =)<div><div></div><div class="h5"><br>
<br>
On 7/11/2010 7:25 PM, Karen Palen wrote:
<blockquote type="cite">I don't have a lot of experience with porting MySql
between different OSes, but general "belt and suspenders"
considerations says that a second and independent path would be a very
good "safety net".<br>
<br>
I would definitely suggest making an IAR backup of every user inventory
and an OAR backup of every region! In that way you have a totally
separate way to transfer the data and at least the opportunity to
recover anything which is corrupted or lost in the transfer!<br>
<br>
I believe there are tutorials on how to automate these backups although
I have not personally tried them. If you have more that 2 or 3 users
and/or 2 or 3 regions then this will significantly reduce the workload.<br>
<br>
It pays to be VER conservative (careful) in making backups since if
information is LOST it can be extremely hard to re-create, finding
something in multiple backups is trivial compared to re-creating
content!<br>
<br>
remember: Jesus saves - EARLY AND OFTEN!<br>
<br>
Karen<br>
<br>
<div class="gmail_quote">On Sun, Jul 11, 2010 at 4:22 PM, Chris
Kennedy <span dir="ltr"><<a href="mailto:mewtwo0641@cox.net" target="_blank">mewtwo0641@cox.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi,
I want to migrate my OpenSim MySQL database from Linux to Windows and
vice versa (for traveling reasons) using the MySQL Admin's SQL dump (
MySQL Admin Backup) feature.<br>
<br>
Is there anything special that I need to know or to look out for when
doing this (besides making sure Max Packet Size is set to 16 MB on the
target system)?<br>
<br>
The way I normally do my database backup in the Linux environment is to
shut down the OpenSim server, go to the backup tool in MySQL Admin,
create a backup project (if it doesn't already exist) for my OpenSim
schema making sure all the tables are selected for backup. Then I go
into advanced options and click on Normal Backup, and check Complete
Backup and run the backup to save my database to a .sql file. This
method has worked perfectly fine for me under Linux with no data loss
after a restore from backup that I can tell. I have even restored my
database to a Windows environment from a Linux created MySQL dump file
with no problems that I can see.<br>
<br>
My concern is creating a database backup in a Windows environment and
then restoring it to Linux (or even another Windows environment). Would
this, under normal circumstances, cause data loss?<br>
<br>
The reason I ask is: I have successfully been able to restore my
Windows created SQL dump file to Linux and other Windows systems
running XP... But the moment I try to restore my database to a Windows
7 system I get an error that says "Object Type not recognized" (or it
might have said Object Type not Found, I don't remember off the top of
my head) and the restore fails.<br>
<br>
In a nutshell, is it safe to port my backups between different
operating systems like this? Or am I better off creating OARs of my
regions and IAR of my inventory(s)? I always make both OAR/IAR and SQL
dump backups just to be safe, but I would like to know.<br>
<br>
Any suggestions and/or tips would be much appreciated! =)<br>
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