I am using neo4j as server solution but was thinking of also using it in other situations.
Is it, from a technical, installation, licensing perspective etc, possible to install neo4j at each users own computer for local storage of data?
I would like to incorporate the neo4j db installation as part of my own software installation process to avoid technical problems for the end user.
It will probably only be very small set of data in each database so performance is probably not an issue in this case.
It is not clear why you want every user to have their own local neo4j installation (since, for example, their local DBs will not contain the same data).
But, if you really wanted to, there is no problem (technically or legally) with installing the community edition of neo4j on multiple machines.
In this You Tube Video, about 30 minutes into it, "Neo4j Licensing: Which Edition Is Right For You" Rik Van Bruggen mention that one must contact neo4j if one want to distribute neo4j together with other software. One possible solution, according to the video, is an OEM agreement. One need to discuss the commercial terms.
He also says that it is not allowed to be done with the Community Edition
It also written at neo4j.com/licensing that
"I want to include Neo4j in software that I’m shipping. What are my options?
Neo4j offers a mature OEM program tailored to your needs. Learn more →"
Summary
I am devloping a app that is intendent to work across multiple graph databases suppoted by tinkerpop
Details
Based on my research the same version of tinkerpop library (gremlin-python) does not work with the latest version of all the graph databases. What is the best approach for this situation. The databases I intent to test are
JanusGraph 0.2.0 supported gremlin-python 3.2.7
NEO4J 3.3.3 supported gremlin-python 3.3.2
I am still trying to integrating some more databases like orientDB and Amazon Neptune do you know what version they will supported.
This issue can be a little tricky especially with non-open source systems that don't publish version and feature support clearly. For open source systems, you can typically find the version of TinkerPop they support for a particular version by looking at the pom.xml of the project. For OrientDB that means finding the version you want (in this case 3.2.3.0) and then looking for the gremlin-core dependency:
https://github.com/orientechnologies/orientdb-gremlin/blob/3.2.3.0/driver/pom.xml#L47
The version points to a property, so examine the pom a bit further and you'll see that number defined above:
https://github.com/orientechnologies/orientdb-gremlin/blob/3.2.3.0/driver/pom.xml#L14
So OrientDB 3.2.3.0 supports TinkerPop 3.2.3. With closed source systems you can only search around until you find the answer your looking for or ask the vendor directly I guess - I've seen that Neptune is on 3.3.x, but I'm not sure of what version of "x".
Just because all of these systems support different versions of TinkerPop and the general recommendation is to use a matching TinkerPop version to connect to them doesn't mean that you can't get a 3.3.x driver to connect to a 3.2.x based server. You may not have the best experience doing so and you would need to be aware of a few things as you do that, but I think it can be done.
The key to this to work from a driver perspective is to ensure that you have the right serialization configuration for the graph you are connecting to. This is true whether you are trying to connect to a same version system or not. By default, TinkerPop ensures that these configurations within the same version are aligned so that they work out of the box. This is why we tend to recommend that you use the same version when possible. When not possible, you need to make those alignments manually.
For example, if you scroll down in this link a bit to the "Serialization" section you will find the supported formats for Neptune:
https://docs.aws.amazon.com/neptune/latest/userguide/access-graph-gremlin-differences.html
As long as you configure your driver to match one of those formats it should work for you. The same could be said of JanusGraph, which in contrast to Neptune, will not support Gryo or GraphSON 3.0 as it is bound to the 3.2.x line. The configuration for the serializers can be found in JanusGraph's packaging of Gremlin Server:
https://github.com/JanusGraph/janusgraph/blob/v0.2.0/janusgraph-dist/src/assembly/static/conf/gremlin-server/gremlin-server.yaml#L15-L21
As to how you configure your python driver for serialization? Admittedly, there isn't a lot written on that. The key is to set the message_serializer when configuring the Client (from gremlinpython 3.3.2):
https://github.com/apache/tinkerpop/blob/3.3.2/gremlin-python/src/main/jython/gremlin_python/driver/client.py#L44-L45
You can see there that by default it is set to GraphSON 3.0. So, that's perfect for Neptune, but not JanusGraph. For JanusGraph, which doesn't support GraphSON 3.0 yet, you would just change the configuration to use the GraphSON 2.0 serializer:
https://github.com/apache/tinkerpop/blob/3.3.2/gremlin-python/src/main/jython/gremlin_python/driver/serializer.py#L149
So, that is just getting a connection working - then there are other things to consider:
If you use a new version of gremlinpython against an older server, you will need to make sure that you are aware of any features that aren't supported on the server (e.g. don't use math() step from your 3.3.x client because it won't work on a 3.2.x server)
CosmosDB has may allow you to connect with 3.3.x, but it doesn't have full Gremlin support and at this time does not support bytecode based traversals - only strings
A number of bugs have been fixed in GraphSON serialization over these releases and sometimes certain types may have a revised serialization scheme that may prevent a 3.3.x from talking to a 3.2.x - I can't think of any big issues like that offhand that would immediately jump out, but I'm pretty sure it's happened - perhaps something in serialization of Tree and perhaps some of the extended types. You can always look at the full list of GraphSON types here and compare between published versions if you run into trouble.
I want to set up automatic online backups of Neo4J 3.x community edition. I understand that this option is available only for the enterprise editions. But is there any way I could do it for the community edition?
Do I have to stop the database and do the dumps? What if I do the dumps on the running DB?
Is there any trick I could do to back up my data?
Thanks!
Neo4J Community Edition does not allow live backup
As mentioned by #ChristopheWillemsen, that feature is available only in the Enterprise version. It is 100% impossible to do backups without bringing the database down in Community.
More information is available at the online operations manual page for backing up, as well as the notation that this is an Enterprise-only feature (note the "Enterprise Edition" tag in the chapter heading).
https://neo4j.com/docs/operations-manual/current/backup/
You need Neo4j Enterprise Edition for that. Neo4j Enterprise is actually open source as well, why not just use Neo4j Enterprise under the open source license. You won't get production support - then again you don't get that with community anyway.
Is neo4j community version usable to store any valuable data ? I started small project to store data in this db and I was surprised how easy is to implement custom ORM and work with transactions. I gather data for some months, but I had unclean shutdown of my db. Some relations got corrupted and then I realized that community version is missing essential tools like online backup, restore and recover db.
I think that Neo guys are trying too hard to push toward enterprise. So anybody, would you recommend Neo db (strictly community) for business project ?
There is a tool for repairing stores that should work with community versions : https://github.com/jexp/store-utils
For your last question, I don't think Neo4j differ from other databases, if you need support then you'll need a license.
An unclean shutdown is caused by something and would have probably the same effect on enterprise version.
Is it safe to rely on strict community version of neo4j: yes as it is safe to rely on mysql community version.
I have a co-worker with a strong background in Ruby that is interested in getting started with Delphi and native development. However, I understand that Turbo Delphi (based on Delphi 2006) is no longer available for download.
So...where does that leave him? Is there any low cost or introductory version of Delphi available legally somewhere? Or is there an offering on the horizon from Embarcadero?
Note: Please don't suggest any legally questionable versions, as that is not an option we will consider.
UPDATED: To sum up all answers the only legal and free version of Delphi that you can download and install now (unless you already have a personal license for Delphi 7 Personal or Turbo Delphi) is Delphi Community Edition.
And the next closest thing is the Lazarus IDE and the Free-Pascal compiler.
This with this should be close enough. It speaks the language at least.
IMO the Delphi 7 Personal Download is the only available legal "non-expensive" version of Delphi. But is is really limited in its features.
It's really a shame that Embarcadero forces one to invest some USD 900+ even if one wouldn't need all the bells and whistles of the Pro version. Especially if products from the "other company" (the Express versions) are given away for free.
I am talking about the need for the discontinued Turbo product line (based on a stable foundation, i.e. D2010 and not D2006) for the hobby software developer to get him started. Maybe his is even willing to upgrade to a full featured version some day.
Chris
Extracts from "About Lazarus":
So just what is Lazarus?
Lazarus is the class libraries for Free Pascal that emulate Delphi. Free Pascal is a GPL'ed compiler that runs on Linux, Win32, OS/2, 68K and more. Free Pascal is designed to be able to understand and compile Delphi syntax, which is of course OOP. Lazarus is the part of the missing puzzle that will allow you to develop Delphi like programs in all of the above platforms. Unlike Java which strives to be a write once run anywhere, Lazarus and Free Pascal strives for write once compile anywhere. Since the exact same compiler is available on all of the above platforms it means you don't need to do any recoding to produce identical products for different platforms.
Yeah, but what about the GUI? What widget set are you using?
That is the neat part. You decide. Lazarus is being developed to be totally and completely API independent. Once you write your code you just link it against the API widget set of your choice. If you want to use GTK+, great! If you want it to be Gnome compliant, great! As long as the interface code for the widget set you want to use is available you can link to it. If it isn't available, well you can write it.
For example. Let's say you are creating a product on Windows using the standard Windows widgets. Now you want to create a Linux version. First you decide what widget set you want to use. Let's assume you want to use gtk+. So you copy the code over to your Linux development machine, compile, and link against the gtk+ interface unit. That's it. You've now just created a Linux version of the Windows product without any additional coding.
At this point in the development we are using Win32, gtk+, Carbon and QT as our API widget set. As soon as Lazarus reaches a 1.0 release developers will be able to start to create the interface unit to tie the LCL (Lazarus Component Libraries) to other widget sets.
So is this thing really RAD like Delphi?
It sure is. Is it totally completed? No not yet.The over all IDE is complete and can be used for most programming needs. Several aspects
of the project are still in need of help. Hint. Hint.
Can I use my existing Delphi code?
Some of it yes. If the code is standard Delphi pascal and it uses the standard components found in Delphi then the answer is yes. If it uses some specific database, OCX, or DCU then the answer would be no. These items are specific to Windows and would only work on and within Windows. However, if you are only looking to create a Windows product using Free Pascal and Lazarus then the answer would be yes. This hasn't been added to the LCL yet but it should be possible in the future.
Can I create commercial products with this?
Yes. The code for the Free Pascal compiler is licensed under the GPL. This means that it is open source, free, whatever name you want to stick to it. You can modify the code if you wish but you MUST distribute those changes or make them available to others if they wish to use it.
The FCL (Free Pascal Component Libraries) and the LCL (which will eventually become part of the FCL) are licensed under a modified LGPL. In a nut shell this means that you can write your own proprietary software that just links to these libraries. You can sell your application without the need to supply or make available your code. However, as with the compiler if you make modifications to the FCL or LCL you must make those changes available to the general public and the world.
Just for completeness, you can get a 30 day trial: https://downloads.embarcadero.com/free/delphi
Also, I'd suggest going to a Delphi conference. You have about a 1 in 30 chance of winning a free copy or a significant discount.
Embarcadero launched a starter edition of Delphi for $199. Latest version is Delphi 10 Seattle.
As Mohammed pointed out there is a upgrade price of $150, from any other IDE or developer tool product including earlier Delphi products.
Important update:
Don't simply download any Delphi version from a mirror, even when they used to be free, when they are no longer available from Borland/CodeGear/Embarcadero.
According to Alexander's comment and contrary to the quote below, even though they were free, it may not be legal to newly install them now.
I wasn't aware of that when I quoted the answer from the question mentioned. Sorry.
if you however decide to learn Delphi,
you might want to look for Delphi 7
Personal which was removed from
Borland / CodeGear / Embarcadero
websites, but still is available on
some mirror hosters. I believe it is
legal to use this as it was once
published as freeware. – migajek
yesterday
Quoted from a comment on the question Do I need to free these objects?
The same may apply to Turbo Delphi 2006...
Since July of 2018 there is a Free Community Edition of Delphi.
At the moment the Delphi Community Edition supports both VCL and FireMonkey as well as building for Windows, macOS, iOS and Android, and is a feature rich IDE (compared to Turbo Delphi) with a limited license. In terms of features the new Community Edition is much, much, much better than past Starter or Turbo editions.
It's targeted at individual developers or companies with total revenue less than 5000 USD and less than 5 developers in the organization (eg. freelance developers, startups, students, non-profits). Note that the total revenue threshold includes all your projects and contracts, no matter if the Community Edition was used in those projects or not.
The Delphi Community Edition comes with a 1 year license. Once it expires you have to reinstall the Community Edition and accept the new Community license (license terms might have changed by then). In this regard the Community Edition differs from Turbo Delphi, which was kind of "use forever" once installed with a personal license.
As another side note, the Community license does not allow transfering the command line compiler to other machines.
Some quotes from the Delphi Community Edition FAQ:
Community Edition is
both designed to allow individuals and startups to bootstrap their
vision until annual revenues reach $5,000 at which point a
Professional Edition license can be purchased.
If you're an individual you may use Community Edition to create apps
for your own use and apps that you can sell until your revenues reach
$5,000 per year.
If you're a small company or organization without revenue (or up to
$5,000 per year in revenue), you can also use the Community Edition.
Once your company's total revenue reaches US $5,000 per year, or your
team expands to more than 5 developers, you can move up to an
unrestricted commercial license with Professional Edition.
...
You may sell any apps or components developed with the Community Edition under the Community Edition license until your annual revenue exceeds US $5,000 or local currency equivalent. Please see license terms here.
...
Can I sell my apps or components built with the Community Edition?
A Professional, Enterprise or Architect edition license is required for developing or deploying any apps or components within any company with total company revenues exceeding US $5,000 or local currency equivalent.
...
If I work for a company with more than US $5,000 in revenue, can I still download Delphi Community Edition or C++Builder Community Edition for my own personal use?
You can download Delphi Community Edition or C++Builder Community Edition as an individual and use it to develop applications for your personal use and use it to create software for you to sell (up to US $5,000 in revenue, see License Agreement for details).
...
How can I get a new 1 year key after my current CE key expires?
Users will be able to request a new 1 year key through the website. That key will be > applicable to the current CE edition that’s available for download at that time.
We will assist you to stay current and up to date, always on the latest version.
As Marco Cantu said Long live to Delphi!
You might alternatively take a look at free CodeTyphon. It is a powerful one click installation package for cross platform native Delphi like RAD/IDE based on Lazarus/FreePascal. Your friend will start coding just few minutes after download. CodeTyphon already supports 4 CPU/OS hosts (Win32, Win64, Linux32, Linux64), and 16 CPU/OS targets (arm-Wince, arm-Linux, arm-Embedded, arm-gba, arm-nds, i386-Win32, i386-Linux, i386-FreeBSD, i386-Haiku, x86_64-Win64, x86_64-Linux, x86_64-FreeBSD, powerpc-Linux, powerpc64-Linux, sparc-Linux, sparc-Solaris). More are supported in Lazarus/FreePascal, but others are not yet integrated in CodeTyphon.