I installed oracle 11g rpm package from oracle-xe-11.2.0-1.0.x86_64.rpm.zip in redhat linux.By default i get database XE .My question is how can i create new database like XE i mean new instance.Please can any one suggest me how to do and please suggest me any blogs for this.
It doesn't matter what OS you use, you can run DBCA (Database Configuration Assistant) it is easy to create a database using this tool. Also pay attention to this question
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Suggest a solution if such exists.
There are 20 empty baremetal servers. Me need to go to the ipmi and manually connect the image file to start the installation OS.
Question: are there any solutions to automate this process?
Since you tag this question with "OpenStack", you must have heard of Ironic.
If the thought of installing OpenStack to automatically install servers frightens you, look up Cobbler. It was used by now defunct products Helion OpenStack and SUSE OpenStack Cloud to set up clouds.
Ubuntu uses MAAS for this purpose.
This is not a complete list.
I have been working with python and postgreql for over a year. I can connect and work with postgres databases by blindly using various libraries. But whenever I change platform (most recently from macOS laptop to remote ubuntu server) I go through a day or so of trying to get libraries working eg. I was using 'pyodbc' in some modules but when I migrated the code to the server I had to switch to 'pg8000' because the modules as they were kept throwing errors.
Can someone explain or point me to a link explaining how python connects to dB's? For example, why do I need a MS ODBC driver for 'pyodbc' to connect to an Azure SQL or postgresql but 'pg8000' seems to need nothing at all to connect to a postgresql? When I move to an Ubuntu environment and install ODBC drivers they show up on root under /etc, and /opt (for MS ODBC) but also in my Conda environment (/anaconda3/envs/) and I don't know which is the correct choice for 'ODBC.ini'?
Like I say, I can get things working but really have no understanding as to why they are working and that means I waste time experimenting every time I deal with a change in environment. I've not yet found an explanation online that covers more than a very specific circumstance eg. 'here's how to install our driver ...' Any help would be appreciated.
Final Update:
Following the responses esp. #Thompson the diagram below seems to be the final interpretation and I have a better idea of where to look for answers. For the record pyodbc, SQLAlchemy and pg8000 have been my tools of choice with no problems except as described in the question.
pyodbc is not actually a driver and doesn't contain one, its a 'module for ODBC databases', so it's more of an interface from python to ODBC driver to some database. That's why to use it you have to have an actual separate driver to connect to. Azure SQL being owned by Microsoft would reasonably require Microsoft's ODBC driver, while Postgres will require a Postgres ODBC driver, etc...
The ODBC driver manager is platform-specific, while the ODBC driver is database-specific. That would explain why if you are you are changing platforms or databases, you need to change drivers.
As Adrian noted, you don't need ODBC drivers for postgres, it is more common to use postgres/python drivers (eg: https://wiki.postgresql.org/wiki/Python)
psycopg2 is an actual PostgresSQL driver. It serves as client from Python to postgres, no intermediary required. That's why you don't need to install anything else when you use it. I haven't used pg8000, but based on this list it's a driver too, so you wan't need anything else.
EDITED TO ADD:
Think of a database as some 'black box' you need to activate, and its drivers as electrical sockets. ODBC driver is a specific type of socket (ODBC is a standard developed by Microsoft). If you are using ODBC plug from python (like pyodbc) to a database, you need to make sure the database has an ODBC socket installed/activated.
But your database can have other sockets too, like python-compatible DBAPI that's available on postgres. In that case you use a different direct DBAPI connector, like psycopg2.
Drivers are specific to a database. ODBC is a two stage process. There is the ODBC driver manager and then there are the database specific drivers that allow you to talk to a database. You don't need ODBC to connect to a Postgresql server. If you are going through Python you just need one of the Postgres drivers. You have already found pg8000. My preference is psycopg2.
My working system is Centos7. Now I'am develop a web application, it use Oracle Database. So I use instantclient 11.2 to connect the Oracle on my Centos7, it use long time to connect! Although connect successful, but I have to wait for at least 3 minute! The web application startup will init the datasource, for each datasource, it also use at least 3 minute to finish! How odd that my colleague connect or init datasource is really quick by use Windows OS(only I use linux)! The database installed at the linux server(also Centos7). we all use the same network environment! How can I fix this problem? I love Linux so much that I don't want to change to Windows for working! Thank for helping me to solve this problem!(I am so sorry that my English is very bad )
I am currently on a project where I have 2 VM (virtual machine), a Windows and Linux one.
I also have an Oracle database where I have a simple table called "Material".
On the 2 VM, I want to connect to my Oracle database without any client or libraries. The thing is I want to create a script which would run on the VM and can connect to my database and insert some datas to my table "Material" but I can't install anything on my VM (like the mysqlclient for exemple).
So is it possible to connect to a database without installing anything on my VM? Or perhaps can I access to an online client to send my SQL to my Oracle Database?
I know it's quite difficult to understand my problem so if you have any question, feel free to ask.
I want to use MySql database as centralised database for storing user informations(credentials) for an iPhone application.MySql is not installed in my system.Can anyone tell me how to use MySql in mac os.
The MySQL manual has a section on installing MySQL on OS X
Obviously, to access it from an iPhone application you will then have to configure it to be exposed over the network (not a good idea except possibly for LAN use only) or put something in between the database and the world (a Web Service is the usual approach).
If you mean that you want to install it on iOS, then forget it. There isn't an iOS version. Look to SQLite instead. AFAIK it is the usual approach for SQL on that platform.