I am a newbie don't know how to use SQL developer. whether I need Oracle database for installing in windows 10 what are these hr and sys users and how to know their passwords. please help me I know this question is asked many times but really, believe me, I have searched a lot but can't find a working solution for it.
Screenshot of my pc:
So you installed Oracle SQL Developer, and you don't know what to do next?
Here's the answer in long-form, with lots of pictures and links.
The short answer: SQL Developer is JUST a client. You need a server to connect to, and that server IS the Oracle Database.
You can get your own running on the same machine as SQL Developer. Oracle XE is free and lightweight.
Or you can get our VirtualBox appliance that has everything already going - a database with test data, hands-on-learning labs, and much more - also FREE.
Of the two, I recommend VirtualBox, because it's more up to date, and it's juts an image - it won't 'pollute' your machine in case you decide to stop using the DB. You can just nuke the image.
Related
I'm currently using SQL Developer 4.5.1.21 and want to take some time to learn language, run queries etc etc. I'm using a database that Oracle provides called "HR Schema" that is free for download. Now I know that I need to create a "connection" in order run queries onto this database. I begin running into trouble when I want to create my own connection. Can anybody walk me through the steps of creating a new connection? What I do is click the "+" button and click "new connection".
The major problem you have here is that you need to have an Oracle database instance installed before you can have something to connect to.
You have a couple of options here...
Download and use the free version of Oracle: Oracle Express Edition
You mentioned that you are a student. Check with your professor to see if they offer a more robust edition of Oracle for student use, such as:
a. Oracle Personal Edition
b. Oracle Standard Edition
c. Oracle Enterprise Edition
If you have the available funds, and you intend on persuing a future in database work, you could purchase a license of one of the above mentioned editions.
You can read more about the various editions of Oracle here.
One thing to keep in mind here is that you are wanting to use the sample schemas that Oracle provides, in particular the "HR" schema. Taking a look at the installation documentation over at the Oracle site, I do not see mention of the Express edition of Oracle server on the availability table, but that may not mean that it wont work.
To address the connection portion of your question, once you get your database set up and running, you should be able to connect to it by providing the hostname (localhost for connecting to your local machine), port, and various other information such as username and password. In all, your connection string would likely look like the following:
Host=localhost; SID=MyOracleServer; port=1677; Min Pool Size=1;
Connection Lifetime=600; User ID=EhBabay; Password=secretpassword123;
Or within SQL Developer you should be able to connect to your local instance of the Oracle database fairly easily, without having to create a connection string. The connection string would still be used though, within any applications you write that you want to connect to the database with.
The main thing here, however is that you need to have an instance of an Oracle database installed and running somewhere that you have access to.
I have been trying to figure out how to start with Oracle SQL, but I can't get the "Connection" to work. I'm not sure what the (connection name, username, password, etc.) fields are.
If I want to create a small database on local host, why do I need to connect in the first place.
I searched Google but still can't get it to work. Any help is appreciated.
ERROR MESSAGE: IO Error: The Network Adapter could not establish the connection
SQL Developer is just a client utility that lets you connect to an existing database. It sounds like you don't have a database to connect to yet. If that's the case, you'd either need someone to create a database on another machine for you or you'd need to download the database software on to your local machine and create a database to connect to. You can download the Oracle database from the Oracle Technology Network, the same place you downloaded SQL Developer from. I would guess that you would want to download Oracle 11.2 Express Edition.
Alternately, you may want to download one of the VMs that Oracle has put together that has a lot of related software installed for you to use. For example, this VM has SQL Developer, Oracle 12.1, APEX, XML DB, and a number of labs already installed for you.
Oracle SQL Developer is a tool to ACCESS existing database, you cannot create new database here. The connection is used to define where your existing database sits and how to connect to it. So you need to name you connection (bookmark), provide host name, where database runs and user name plus password to identify yourself.
I'm in a database class and the teacher wants us to connect through ssh to an oracle database setup on a school server and it's been extremely frustrating. She wants us to turn in an sql file that will create all the necessary table, insert tuples, run certain select commands which I've found to be very hard to get an sql file with everything after i get everything right and I haven't found a way to test the sql file against the server and I don't think I have permission to drop tables anyway. Anyway my question is there a way I can take an sql file with create table and insert commands to convert it to something like an access .mba database or something local i can mess around with? and help would be greatly appreciated didn't find much help on google.
You seem to be confusing terminology a bit; SQL*Plus is a client application, and the database is a shared server resource. You want to create schema objects from an SQL file, I think. But anyway...
There's a very useful online resource for experimenting with bits of SQL in various flavours, SQL Fiddle. Technically not 'offline' of course, but I'm taking that to mean off your school's network, not necessarily completely isolated. You can create tables and run your inserts in the schema panel, and then run queries against that. Make sure you pick the right database product from the drop-down menu so you're using syntax that is valid for your class. You'll see a lot of answers here with links to demonstration fiddles.
That's great for a lot of things but if you want something a bit more robust and scalable, and entirely offline, you can install VirtualBox and get a pre-built developer VM image which gives you a ready-to-go Linux environment with a database installed and running. You can run whatever you want against that, you have SQL*Plus and SQL Developer available, and you can connect to the DB from your host machine if you want to. You can create and test your scripts against that, and in a format that will be closer to what you have to hand in than you'd use with SQL Fiddle.
This is much less work than installing the Oracle software yourself and learning how to create and manage the database, which I'm guessing is a bit more advanced than you need at the moment, based purely on the kinds of thing your question suggests you're dong at the moment. I think you'd learn a lot from the installation and build process, but I'd get comfortable with Oracle first, and maybe practice in a VM first as it's so much easier to trash it and start again when you mess something up.
If I wanted 'something local I can mess around with', I would go for a VM image. Mo posted a walkthrough of the VM setup as a comment to a previous similar answer, which you might find helpful.
"Something local I can mess around with" in terms of Oracle Database is Oracle Database 11g Express Edition. It's free and can be downloaded from oracle.com. You certainly can test sql-files run through sqlplus on Oracle Database XE.
To get the MS Access (GUI) feeling, download SQL Developer. It's free.
Best of luck!
Bjarte
The background to my problem is based on distributed computing. I want to have a database with some numbers in them and then a number of computers go through each row calculating another number (a little bit of an over simplification).
The problems I'm having are routed in my poor understanding of SQL servers (I think). I've got Microsoft SQL server 2012 (and 2008) installed on this machine and I've somehow managed to make a server for this task but then the problems arise.
I can't add a table to the server (I'm trying to do this in VS2010). When I expand the server and right click on tables and select add new table i get the following error:
"The server version is not supported. Only servers up to Microsoft SQL Server 2008 are supported."
That stops me making a table and from there I can't move on. I've downloaded and installed the VS2010 SP1 (and re-installed it again when it didn't fix the problem) as I found this suggested for similar issues.
Any help on this would be greatly appreciated. I've read around but nothing seems to work, people suggest using "SQL Management Studio" but I don't seem to have this installed!
Also, I haven't gotten to this step yet, but if this gets fixed any advice/links on how to access the database from a different machine (over the same local network) would be greatly appreciated!
Many thanks,
Fraser
R Harvey gave you the pointer to SSMS - that's the ideal tool to use.
As for other computers accessing your local database - the name of your computer (where MSSQL is installed) is the name of the server in your connection string.
I need an expert insight to my problem. most of my experience is development so i dont have enough grasp regarding server issues or maintenance. Main problem is when traffic is high request to this SQL server times out. there are several applications connecting to this server, some are web some are windows app. i would like to know if i need to do hardware upgrade(more ram, more hdisk space and how much of each is enough) or SQL server maintenance (rebuilding index, SP enhancement, denormalization etc.) or both?
OK first let me give you some specs of the server i'm having trouble with.
OS: MS Windows Server 2003 Standard
Version: 5.2.3790 SP 1 Build 3790
System Type: x64-based PC
Processor: EM64T Family 6 Model 15 Stepping 6 GenuinIntel ~2993 Mhz
RAM: 8gb
free C: space: 400mb
SQL Server Soft. Ver.: Sql Server 2005 Developer Edition
hope info above is enough for a diagnosis. my main concern initially is the available space in c:. also i'm looking at the RAM, i use perfmon and when traffic is high its reaching its max. as for CPU i have no idea but sometimes its running at 100% but its not always like that so i think its normal.
next question i think will be pointless because i cant give you sql db details but i will ask anyway. Will reindexing help or SP optimazation and to what extent? db is at 50+gb now
do we need a new server(hardware)?
Will Updating the sql server software help? from 2005 to 2008? is there an issue when your SQL server prod is only dev edition?
when you have an issue like this what could be the default fix or quick fix if there are any..
I hope an experienced Sys. Ad. or DBA or some programming god have pitty on me and enlighten me regarding this problem
Thanks in advance.
The first step would be to provide more useful information in your question. How does the server behave under pressure.
Use perfmon and or Sql Profiler http://msdn.microsoft.com/en-us/library/ms187929.aspx to log a number of data points while it is under load.
Also see Performance tuning with SQL Server and https://serverfault.com/questions/4700/how-to-do-periodic-sql-server-performance-monitoring-and-troubleshooting