@jaredbusch said in Restoring a Windows MS SQL Server Database to Linux With Move SQLCMD:

@scottalanmiller I have not had to do that before with a normal backup to a .bak and then restore. Not some an place move like it seems you are doing.

Happens if going to a space with a different storage layout. If you are coming from Linux you are probably fine. But Windows injects the drive letter into the path (obviously) and so going from one machine to another that doesn't keep identical storage path names causes the issue.

@scottalanmiller said in Multiple Virtual Disks and Application Performance:

Remember.... just because you are virtual does not imply that your storage is virtual, nor does virtual storage imply that the storage will be shared between workloads or VMs. None of that is implied or suggested in going virtual. You still maintain all proper storage management decision making when virtual as you did physical. You don't get to give any of that up.

In restrospect, I probably ought not have included the System Center Dude stuff in the discussion, since it seemed to just cause confusion about what I was curious.

You still maintain all proper storage management decision making when virtual as you did physical.

I believe this is the greatest takeaway from the discussion. Regardless if the environment is like the one I'm in where ultimately one physical storage device is hosting all of the virtual storage within the VMs.

@Romualadas said in Error After Firebird 2.5.9 Update:

@scottalanmiller
Tried your link. Results:
yum install /tmp/FirebirdSS-2.5.9.rpm
Loaded plugins: fastestmirror
Examining /tmp/FirebirdSS-2.5.9.rpm: FirebirdSS-2.5.9.27139-0.amd64
Cannot add package /tmp/FirebirdSS-2.5.9.rpm to transaction. Not a compatible architecture: amd64
Error: Nothing to do
Server architecture:
Kernel and CPU Linux 3.10.0-1062.18.1.el7.x86_64 on x86_64

Looks like their packages are bad at this point. You definitely have the right, matching architecture there. Seems that they are having a lot of problems these days. It's such a niche product, I'd be super wary of every using it in production or any software the depends on it. Using it as an option, sure, but requiring it I'd consider a non-starter. Absolutely no one supports it.

I've seen that a lot. When I import Drupal databases, I learnt to use its Backup and Migrate module instead, it works flawlessly. Downside is you need to do clean Drupal installation first, but that basically is just creating blank database and putting brick on enter key.

@Pete-S said in How to Rename a Column in SQLite Database:

There used to be a lot of databases like SQLite. Often called database engines. dBase was probably one of the first.
Later Microsoft Jet engine (aka Microsoft Access) became popular when Visual Basic ruled the world.
Basically it's a one user database. You can have more than one user but it's done by multiple users accessing the same database file.

Or by having an application on top that accessing the file and shares it out. That thing can be called a "database management system" or any application, really.

All databases use database engines. MySQL, for example, isn't a database. It's a database management system. It uses one or more database engines to talk to the files on disk. MyISAM and InnoDB are two database engine options for the MySQL platform.

At the end of the day, all databases work like SQlite. You can easily build your own database management system that uses SQlite as the engine and it could work just like MySQL or Oracle or SQL Server. Those are all single users to a file, under the hood. They just have the "multi-access" management built into an extra layer, instead of letting an application handle it.

But for most things, you only access a database from a single app anyway, so that extra layer is often unnecessary as it is redundant. Just adds overhead.

@scottalanmiller

I like your 53 mins intros, but that said you cover and reach all the important parts. I wonder what will be deep dive session how long will that video be.

@Obsolesce said in UREs Strike InnoDB on MySQL:

@scottalanmiller said in UREs Strike InnoDB on MySQL:

@Pete-S said in UREs Strike InnoDB on MySQL:

Step one is to remove the drives and clone them with dd or recovery tool to a new drive.
You could probably recover 99.9% of the data - if you want.

As you can guess from all of their previous issues, they don't want to pay for any recovery, they just want it magically fixed for free. They don't own any storage onto which to clone it, either.

Then what is the point of any of it? It appears to have zero value to the business.

I said that to them.

@dafyre said in PATH Error with TimeScaleDB-Tune on Fedora 30:

then why are you even using it?

Capacity Planning, for example.

I've done both. I tend to like MariaDB / MySQL better because that is what I'm more comfy with.

So, easy fix, the ca_stag2 was a staging DB that was not needed and was not current. The whole thing appears to have corrupted. So I simply "moved" that entire directory to /tmp (just in case I had to put it back) and then MySQL could fire up.

@matteo-nunziati said in Performance Advantages to Splitting Applications from Databases:

@gtech yeah the only reason is saturation of resources and scaling out.
rdbs do not scale out easily while front ends do.

And RDBMSs tend to scale better vertically (throwing more RAM and CPU in a box) while app servers tend to scale better horizontally (throwing more, smaller boxes at it.)

@WrCombs said in Database Server vs File Server: What's Different:

@scottalanmiller said in Database Server vs File Server: What's Different:

@WrCombs said in Database Server vs File Server: What's Different:

Is it possible for a File server to run a database server ? how would that be classified at that point ?

No, conceptually that would not mean anything. A file server and a database server are discrete concepts.

A single operating system can run neither, either, or both. But as servers themselves, they are discrete.

I gotcha. It was one of those hypothetical questions

What's messy is that technical file servers are a very, very specific form of database server. Because a file server presents a file system over a network. And a file system is a special case database.

No one really thinks about this and absolutely no one will talk about file servers this way, but for understanding what is actually happening... file servers are special purpose database servers. And that is very easy to prove.

So a file server is a database server, but a database server is not a file server. But file servers are so common, unique, and discrete, we treat them as totally different animals and no one considers the two to even be similar.

@black3dynamite said in Setting Up a Standard MySQL or MariaDB Database for an Application:

@JaredBusch said in Setting Up a Standard MySQL or MariaDB Database for an Application:

I like my approach to setting this up.

Obviously, install MySQL/MariaDB first as noted above.

Then do the following. This all needs done in the same SSH session, but otherwise things are simple.

Choose once of these exports for your DB root password.

The first one is for you to specify, the second generates a random one and echo's it back to you.

# Specify your own password for MariaDB root user export DB_ROOT_PASS="somebigpasswordgoeshere" # Generate a random password for MariaDB root user export DB_ROOT_PASS="$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 30)" echo "This is your MariaDB root password: $DB_ROOT_PASS" Specify the application database name and application user name # Database user to use for application export DB_USER='yourusername' # Database name to use for application export DB_NAME='yourdatabasename' Generate or specify a random password for the database user # Specify your own password for the application's database user export DB_PASS="somebigpasswordgoeshere" # Generate a random password for the application's database user export DB_PASS="$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 30)" echo "This is your password for the application user: $DB_PASS" Then create the application database, use, and grant access. mysql -e "CREATE DATABASE $DB_NAME;" mysql -e "CREATE USER '$DB_USER'@'localhost' IDENTIFIED BY '$DB_PASS';" mysql -e "GRANT ALL ON $DB_NAME.* TO '$DB_USER'@'localhost';" mysql -e "FLUSH PRIVILEGES;" Finally, lock down the system without the interactive requirement of mysql_secure_installation # Secure MariaDB (this does what mysql_secure_installation performs without interaction) mysql -e "UPDATE mysql.user SET Password=PASSWORD('$DB_ROOT_PASS') WHERE User='root';" mysql -e "DELETE FROM mysql.user WHERE User='root' AND Host NOT IN ('localhost', '127.0.0.1', '::1');" mysql -e "DELETE FROM mysql.user WHERE User='';" # Beginning on some version of MariaDB after Fedora 29 was released, the test DB is no longer there by defualt. mysql -e "DROP DATABASE test;" mysql -e "FLUSH PRIVILEGES;"

Your approach makes it easier to use as part of a script.

It also generates random passwords, which I prefer.

@Dashrender said in Make an osTicket Database Backup:

Total DB Admin noob here - so bare with me.

Does this include the username/password setup for this DB? or does that need to be maintained separately?

i.e. you have to rebuild from this backup - do you just create a brand new SQL user and grant them rights to this DB upon import, then use that new account to give access to the app?

In typing out my question I kinda assume the answer is the second bit - you just create a new user and assign them rights.

Correct. The user and the database are separate things.

@pmoncho said in Slow MS SQL Queries between Windows 10 VMs and MS SQL 2014 on same host:

@JasGot said in Slow MS SQL Queries between Windows 10 VMs and MS SQL 2014 on same host:

Winner Winner, Chicken Dinner. It was MDTC and Windows Firewall. (Which is frustrating, because the firewall is turned off for the domain!)

Good job at troubleshooting. I'm wondering what led you down this path versus something related to Networking, hard drives or software drivers?

Remembered it from several years ago with another SQL based application. Don't know what made me think of it at 1:30am. But I'm ok with it!

@Emad-R said in Installing MS SQL Server Express on CentOS:

Et me guess it is much faster on Linux than on Windows server

No idea, but it is one less Windows Server license needed.

Also MS SQL Server Express works well for many tasks.