Datomic Knowledgebase - Recent questions and answers

Answered: Datomic peer on dynamodb - misleading error message

Fri, 13 Mar 2026 13:56:01 +0000

We have captured the concern and are evaluating how to point folks in the right direction either via an improved error message, better documentation. Will circle back and update here once we have a solution.

Answered: Datomic on JDK25 - WARNING: A terminally deprecated method in sun.misc.Unsafe has been called

Fri, 13 Mar 2026 13:52:54 +0000

We're evaluating jdk25. Thank you so much for this report.

Answered: Datomic on JDK25 - WARNING: A restricted method in java.lang.System has been called

Fri, 13 Mar 2026 13:52:47 +0000

We're evaluating jdk25. Thank you so much for this report.

Answered: Datomic peer - Support SSO

Fri, 13 Mar 2026 13:52:11 +0000

@Enzzo We just released an update to run on AWS SDK v2. Please let me know if this resolves your issues using SSO.

https://docs.datomic.com/changes/pro.html#1.0.7556

Answered: Datomic Pro's executable shell scripts (e.g. transactor.sh) fail on NixOS

Fri, 19 Dec 2025 14:10:14 +0000

Thanks for the report, I will assess options and confirm #!/usr/bin/env bash works on existing environments.

Answered: Why does changing the #inst reader make my query fail?

Wed, 22 Oct 2025 00:04:36 +0000

Favilla answered this on Clojurians slack:

Function expressions in queries are compiled with eval. In your case it would be evaluating something like (clojure.core/fn [?exit] (java.util.Date/.before ?exit <j.u.Date-object>) )
But for reasons I don't know, clojure eval invokes the reader on the date object:

(def dr-instant
  (assoc *data-readers* 'inst (fn [cs] (java.util.Date/.toInstant (clojure.instant/read-instant-date cs)))))

(let [expr [(java.util.Date.)]]
  (-> (binding [*data-readers* dr-instant]
        (eval expr))
      first
      class))
;; => java.time.Instant

(let [expr (list 'do (java.util.Date.))]
  (-> (binding [*data-readers* dr-instant]
        (eval expr))
      class))
;; => java.util.Date

(let [expr (java.util.Date.)]
  (-> (binding [*data-readers* dr-instant]
        (eval expr))
      class))
;; => java.util.Date

Answered: 500 errors from api gateway for large Ion responses

Thu, 15 May 2025 05:04:46 +0000

For anyone getting opaque 500 errors for large responses through IONs in the future, in other words the problem that I was reporting here, in my case the problem was a response header was > 10k which exceeds this documented limit here...

https://docs.aws.amazon.com/general/latest/gr/apigateway.html#limits_apigateway

I hope this saves somebody some time.

Using a collection of datoms as input to a query

Thu, 24 Apr 2025 12:51:36 +0000

I was wondering if there is a way to use a collection of datoms obtained from d/tx-range + get a single tx or received from a listener that subscribed to a tx queue as input to d/q? The nature of this collection looks very similar to history db which can be used with d/q, however passing this collection as input does not produce the expected result. Neither there is any error.

Answered: Why does Datomic store all databases in a single datomic_kvs table instead of having a separate table per database?

Tue, 18 Mar 2025 12:05:10 +0000

Hi Nikolay,

Understood your desire for a separate KV table provisioned per DB.

For Datomic Pro we tend to recommend that large mission-critical database have their own dedicated transactor and peer processes. We discuss this in the documentation here https://docs.datomic.com/operation/capacity.html#multiple-databases because garbage collection pauses impact across all databases and other shared resources can impact one databases performance over another.

I do want to point out that you can currently move your databases to their own separately provisioned systems, separate tables and transactor pairs + peers using backup and restore. Backup one DB and move to a new table. https://docs.datomic.com/operation/backup.html

I have shared your feedback with the team, and we will consider features in this space.

Thanks,
Jaret

Answered: "No suitable driver" when starting peer

Tue, 25 Feb 2025 12:31:30 +0000

Hi Chip,

Sorry for the late reply, you need to give your peer (the repl) the postgres dep so it has the driver:

org.postgresql/postgresql {:mvn/version "42.5.1"}

https://docs.datomic.com/operation/storage.html#jdbc-drivers

We only include this dep on the transactor and peers still require configuration.

Cheers,
Jaret

Answered: datomic's spymemcached fork collides with original

Tue, 25 Feb 2025 12:28:38 +0000

Thanks for the report Mike, how are you setting the property?

Just something like this in the logback.xml for a transactor? a peer? ether?

<logger name="net.spy" level="WARN"/>

I am looking to reproduce to track down what we missed.

Answered: Regression in latest datomic when transacting data & schema in one tx

Tue, 25 Feb 2025 12:25:28 +0000

@Mike

You cannot create and use an attribute in the same transaction. You have to separate them. Without installed schema resulting from a transaction, datomic cannot perform tasks like uniqueness checks on subsequent transactions or be aware of the existence of the attribute.

It would be great if you could recover what version of Datomic this ever "worked" on so I could understand the circumstances. The only thing I can think of is this appeared to work perhaps on a mem database?

Thanks,
Jaret

Answered: how do I connect to a datomic transactor from a tomcat servlet?

Mon, 06 Jan 2025 09:25:55 +0000

did you add dependency on datomic library?

Answered: How to deprecate a composite tuple?

Mon, 06 Jan 2025 09:24:47 +0000

I had the same problem, actually it was problem when an old composite tuple attribute was marked as unique so the solution was to retract unique constraint

Answered: transactor on-prem logging

Fri, 03 Jan 2025 17:00:50 +0000

You can utilize the logback.xml and logback configuration to turn down logging, turning off entire namespaces of logs or changing the level lower.

https://docs.datomic.com/operation/configuring-logging.html
https://logback.qos.ch/

Answered: import-cloud fails with "No reader function for tag object"

Fri, 13 Sep 2024 13:37:11 +0000

One hack I tried to get around this bug is to remove the key-value pair that irreversibly encodes the credentials provider in the db-local files. The relevant file appears to be

./datomic/<system>/<db>/db-root-0000000000

This file seems to be a simple EDN file.

But even if I remove the :creds-provider key (which should not be required after the db is imported), I still can't connect to the imported db. The d/connect process gets much further along after a log of Loading....., but still ultimately fails with the same error.

Maybe the creds providers is encoded somewhere else ...

Answered: Why does Datomic block shutting down when using :timeout in d/query?

Wed, 17 Jul 2024 13:56:41 +0000

Hi @Leah,

Thanks for the report. Instead of your work around, I would ask if you have tried to utilize release in your peer applications that you intend to shut down. I believe that it will release these threads without requiring special action on your part.

https://docs.datomic.com/clojure/index.html#datomic.api/release

I am not entirely sure on the oversight/bug aspect, but will bring up this observation with the team and circle back.

Cheers,
Jaret

Answered: Dockerize Datomic

Mon, 24 Jun 2024 18:37:58 +0000

If folks are interested in an official Docker Image we would love to hear from you on your preferred JDK, storage protocol, classpath functions usage, and metrics callback.

It would help us tremendously to understand what users are already doing in this area with their own images. Please feel free to add a comment here with your current docker setup or wishlist.

Answered: is there a "un-divert" to undo divert-system

Wed, 05 Jun 2024 11:39:51 +0000

@Phil

No we do not currently have a feature to un-divert and switch back to the original endpoint. I have logged this request with the dev team, but currently you would need to kill the process and start a new connection. You can alternatively call divert again to a new storage-dir location, but you cannot un-divert so that client calls go to the original endpoint.

Cheers,
Jaret

Answered: How to write the Metaschema file?

Mon, 03 Jun 2024 17:28:31 +0000

Hi OwlMoon0,

You can find more information on metaschema here: https://docs.datomic.com/analytics/analytics-metaschema.html

And The [etc-samples] directory includes a Metaschema file matching . Here is the mbrainz meta schema file: https://github.com/Datomic/mbrainz-importer/blob/master/metaschema/mbrainz.edn

Let me know if this helped you.

Thanks,
Gabi

Answered: http-direct configuation not working as per tutorials

Tue, 07 May 2024 19:51:47 +0000

Ugh! @phil Sorry that the screens have changed. I am going to need some time to reproduce what you are looking at to try to figure out what has changed and where you need to go. I think I probably have enough to go on here, but if there is any information you have not yet shared (perhaps because its not appropriate for this discourse) please feel free to forward into a support case at support@datomic.com.

Cheers,
Jaret

Answered: equality on d/entity ignores db

Wed, 01 May 2024 08:38:35 +0000

Hi Datomic peeps. Would you please consider a fix for this, or open-sourcing Datomic? Beginners are getting bitten by this using Datomic with reactive engines like Electric. I only use d/pull now and shy away from d/entity to avoid this bug. Datomic's tx listener is well-suited to reactive engines.

Using Valcache via Docker bind mounts

Thu, 11 Apr 2024 09:50:54 +0000

I'm evaluating caching options for Datomic Pro. Valcache sounds like a great fit, but there is one thing that might be a showstopper.

The Prerequisites docs says that "Valcache relies on an SSD with the strictatime and lazytime flags set". This requirement I can meet pretty easily by remounting the disk on the hosts running the peers.

Now, the applications that are Datomic peers, who would be the users of these Valcaches, run as Docker containers in a Docker Swarm. The idea is to mount the Valcache as a Docker bind mount.

Would this work? The underlaying SSD disk would be mounted with strictatime and lazytime, but would whatever mechanism that requires these flags to be set work through a Docker bind mount?

Answered: How do I restart a gc-deleted-dbs after it got canceled in "Deleting garbage segments" phase?

Fri, 22 Mar 2024 11:45:48 +0000

@TuggyNE

What is your evidence that the job has not started again? Is it simply that you are not seeing work being done? You say it "no longer recognizes any need to clean up garbage segments, the third stage" what is the output of running it again? Is there an error or does it complete?

Possibly security issue with the dev H2 storage?

Wed, 13 Mar 2024 21:58:26 +0000

While trying to understand more about the behaviour of Datomic dev (mainly from a security/encryption point of view), I attempted to connect to datomic.mv.db from an instance of the H2 console. I accidentally tried to log in as "admin" with a blank password and was surprised when I connected successfully. Connecting as "admin" with any password fails, so it seems explicitly to be blank. As far as I can tell I only have public schema access and can't see any transacted data, but I am able to run SQL queries in the console.

Clearly a dev transactor isn't intended to be high security, but admin with a blank password seems risky even for a dev environment. In most SQL environments I work with, the sa/admin account is just disabled if not used. Am I missing something?

As an aside, does the dev transactor use H2's AES encryption or is the resulting data file unencrypted?

Answered: Are DB values obtained from a single conn guaranteed to include transactions submitted against the same connection?

Wed, 13 Mar 2024 19:19:23 +0000

I believe the reason this "tends" to work is because the connection is a singleton

Datomic connections do not adhere to an acquire/use/release pattern.
They are thread-safe and long lived. Connections are cached such that
calling datomic.api/connect multiple times with the same database
value will return the same connection object.

Based on this, the db acquired from your connection should always be >= the db referenced in any completed transactions that have been confirmed on the same JVM (after all, datomic.api/db does not communicate with the transactor).

So, what is a circumstance where this wouldn't hold? Of course, there could be a communication failure after the transaction is processed but before it is acknowledged...but in that case transact would result in an error.

What about if the Peer implementation changed, such as keeping a connection per thread instead of per JVM...in that case you'd need to sync within the JVM to coordinate this (just as you would in the distributed scenario).

I'd conclude that the guarantee is dependent on an implementation detail (albeit a partially documented one).

Answered: Why is the pull pattern for wild card giving me an error?

Wed, 31 Jan 2024 16:27:48 +0000

It seems that the documentation is not clear on this, and the problem is related with the fact that you need to use [:*] in these situations, instead of the documented '[*].

Answered: Multiple CVEs are reported on Datomic Peer 1.0.7075

Mon, 29 Jan 2024 12:06:15 +0000

Hi Stefan,

Thanks for letting us know. Memcache-java-asg is a fork of com.aws/elasticache-java-cluster-client which is a fork of spymemcached. You should feel free to exclude our dependency here as needed. You would only use this jar if you were using elasticache and auto node discovery: https://docs.datomic.com/pro/overview/caching.html#node-auto-discovery

That being said, I'll bump the story to update this jar.

-Jaret

Answered: how to run a dev transactor from the same process as a peer?

Mon, 29 Jan 2024 00:10:49 +0000

Hi @Chpill. The peer library can act in standalone mode, using an in-memory database as a stand-in for the other components. A memory DB is in the same process as your peer:

https://docs.datomic.com/pro/getting-started/connect-to-a-database.html#create-db

`(def db-uri "datomic:mem://hello")`

It will not persist and is entirely in memory, but seems like what you are after for development purposes. Otherwise, as you have alluded we recommend process isolation per the design: https://docs.datomic.com/pro/operation/deployment.html?search=isolation#process-isolation?

Answered: java.lang.IllegalStateException: Can't set!: io-index from non-binding thread

Thu, 25 Jan 2024 22:44:55 +0000

I figured out this was caused by a custom transaction function that used pmap to concurrently do d/q queries.

This used to work, but I assume it was never supported and stopped in recent releases.

Just leaving this here in case anyone else hits this issue in the future.

Answered: Can I run recent versions of Datomic in Windows?

Thu, 14 Dec 2023 17:29:11 +0000

My working solution:

I have the necessity to run Datomic on a Windows Server which does not have a WSL and the following PowerShell script works.

if (-not $args[0]) {
        echo "Usage: $PSCommandPath properties-file-or-uri"
        return
}

$CP_LIST = "bin;resources;" + ((ls *transactor*.jar, lib\*.jar | % { $_.FullName }) -join ';')

java -server -Xms1024m -Xmx1024m -XX:+UseG1GC -cp $CP_LIST clojure.main --main datomic.launcher $args[0]

When placed under .\bin\transactor.ps1 I can run the command from the PowerShell and it successfully starts the server.

Other scripts need also an update but at least I've got the transactor to run.

Answered: Is it possible to run a transactor within the scope of my application?

Tue, 12 Dec 2023 12:54:29 +0000

Hi Tom,

It's possible, but not recommended for the reasons you highlight around concerns for resource contention and more importantly the ability to reason about performance and reliability. At scale you're going to want to have these things separated out. Here are our docs:

https://docs.datomic.com/pro/operation/deployment.html#process-isolation?

Cheers,
Jaret

Answered: Is it possible to separate Datomic On-Prem from Cloud?

Mon, 04 Dec 2023 15:55:33 +0000

Hi Tom,

We have included the whole AWS SDK for historical reasons, but we are currently evaluating narrowing down the list to just the required dependencies in a future release of Pro. I suspect this work will be prioritized in Q1, but please poke for updates. The subset of what we need from the SDK is essentially S3, DynamoDB, KMS, SNS, EC2, ELB, CloudWatch, IAM, and CF. You could attempt to narrow down the list yourself if you can't wait until we pick this work up. I may be forgetting something and if I am please do circle back with what you find as you might expedite our audit :).

Cheers,
Jaret

Answered: Database functions, Classpath functions, and Transaction functions

Fri, 03 Nov 2023 11:37:46 +0000

I think it could be clearer in our docs and I will talk about this with the team, but Class path functions are transaction functions as well as query functions. You can add them in a different way, the class path, vs just transacting the fn to the db

Yes transaction functions/class path functions must be pure and free of side-effects:

https://docs.datomic.com/cloud/transactions/transaction-functions.html#creating

Answered: Support java.time.instant

Fri, 03 Nov 2023 06:22:11 +0000

The lack of java.time support is getting more and more annoying as our code-base grows.
It turned out that even passing a YearMonth value to a transaction function, which would convert it to java.util.Date is not possible.

I've tried to extend the transit reader & writer handlers, but it was not sufficient, because somewhere along the way the YearMonth instance has been converted into a com.cognitect.transit.impl.TaggedValueImpl and stayed like that when it reached our transaction function.

The same transaction worked with d/with though, because it doesn't seem to involve marshalling and unmarshalling.

I've even checked within datomic.client.impl.shared.io/marshal, that the marshalled byte-array, when unmarshalled, is equal to the input (m)

(defn- marshal
  "Encodes val as Transit data in msgpack. Returns a map with keys:

  :bytes - a Java byte array of the marshalled data
  :length - the length in bytes of the marshalled data.

  Note that for efficiency's sake the byte array may be longer than
  the returned length."
  [m]
  (clojure.pprint/pprint m)
  (let [stm (BytesOutputStream.)
        w (transit/writer stm :msgpack {:handlers write-handlers})]
    (transit/write w m)
    (let [unmarshalled (unmarshal (java.io.ByteArrayInputStream. (.internalBuffer stm)))]
      (clojure.pprint/pprint [unmarshalled (= m unmarshalled)]))
    {:bytes  (.internalBuffer stm)
     :length (.length stm)}))

the result:

{:t 3857,
 :next-t 3858,
 :db-name "predict",
 :database-id "6652bfa3-2e73-445f-8379-2448f824cbf3",
 :tx-id #uuid "25c92f68-a931-44b7-b96d-c4be8fa147fb",
 :tx-data
 [[ginoco.datomic.component/loophole #time/year-month "2000-01"]],
 :op :transact}

[{:t 3857,
  :next-t 3858,
  :db-name "predict",
  :database-id "6652bfa3-2e73-445f-8379-2448f824cbf3",
  :tx-id #uuid "25c92f68-a931-44b7-b96d-c4be8fa147fb",
  :tx-data
  [[ginoco.datomic.component/loophole #time/year-month "2000-01"]],
  :op :transact}
 true]

Answered: Is there way to use s3 compatible backup storage

Wed, 01 Nov 2023 16:39:36 +0000

@Dspiteself

You're interested in backing up to a google cloud storage that is similar to S3? Right now we only support s3 and file. Does providing a file location to Google's storage option work?

https://docs.datomic.com/pro/operation/backup.html#uri-syntax

Which google storage are you hoping to use that is similar to S3? We can review to see if we can provide that option as a target for backup.

-Jaret

Answered: Equivalents for d/with; transaction function test scaffold story when using cloud

Wed, 01 Nov 2023 16:34:58 +0000

Hi Mike!

The peer api is not usable in Cloud, but after thinking about your situation I have a few points.

The client api has d/with: https://docs.datomic.com/client-api/datomic.client.api.html#var-with
I would recommend doing this kind of testing using Datomic local. https://docs.datomic.com/cloud/datomic-local.html. (added benefit you can actually import your DB and test against it with import-cloud + utilize an in-memory DB locally).

Does that cover your need for testing in Cloud?

All that being said, I have captured your question and use case here for our on-going consideration of apis for Cloud/Pro.

Cheers,
Jaret

Answered: Why do values of :db.type/uri return as com.cognitect.transit.impl.URIImpl?

Tue, 10 Oct 2023 12:04:08 +0000

I've reproduced this problem and we are working on a fix for a future release. Will updated when I have more details.

Cheers,
Jaret

How to change the default 1 minute jetty async servlet timeout?

Thu, 10 Aug 2023 16:01:07 +0000

We have some ring routes in our HTTP direct ring handler, which returns some Excel files, which are constructed on the fly.

This handler sometimes runs for more than a minute, resulting in the following error:
HTTP ERROR 503 Async servlet timeout URI: /... STATUS: 503 MESSAGE: Async servlet timeout SERVLET: cognitect.http_endpoint.jetty.FnServlet-49bf6f8c Powered by Jetty:// 9.4.48.v20220622

How can we raise this timeout to ~5minutes, which is the maximum timeout of AWS NLBs?

(We are exposing the HTTP direct ion endpoint to the public internet via an AWS NLB, to avoid the 30s timeout and 10MB response payload limit of the AWS API Gateway)

Multiple sources on the internet - eg. https://github.com/ring-clojure/ring/issues/299 - mention a org.eclipse.jetty.server.HttpChannelState.DEFAULT_TIMEOUT Java property which is supposed to affect Jetty's async context timeout.

Since the change of this property at runtime is not picked up by a running jetty instance, we have added provided it as a startup option, via the OverrideSettings CloudFormation template parameter:

`
{:OverrideSettings
(str "export JVM_FLAGS=\"$JVM_FLAGS"

  " -Dclojure.server.repl="
  "{:address,\\\"0.0.0.0\\\",:port,50505,:accept,clojure.core.server/repl}"
  " -Dorg.eclipse.jetty.server.HttpChannelState.DEFAULT_TIMEOUT=300000"
  "\"")}

It is indeed observable within the ion JVM process:
(Long/getLong "org.eclipse.jetty.server.HttpChannelState.DEFAULT_TIMEOUT") => 300000

Yet we are getting a 503 timeout response from the cognitect.http_endpoint.jetty.FnServlet-49bf6f8c servlet after 1 minute still.

Request, which take less then a minute work as expected.

Answered: Why does :db/ensure appear as an attribute in my entities?

Sat, 15 Jul 2023 04:50:52 +0000

I just described the same question in https://forum.datomic.com/t/db-ensure-doesnt-seem-virtual/2296 with my own example.

Based on the long silence, I'm guessing, it's just a mistake, imprecision or ambiguity in the documentation, that the :db/ensure is described as virtual.

It would be really helpful to clarify this in the docs, because people will just keep wasting time on wondering about it.

Is `(pull $db2 ?e [*])` supported officially?

Sat, 15 Jul 2023 04:42:45 +0000

The documentation only mentions the syntax without a src-var:

pull-expr = ['pull' variable pattern]

but found that this syntax also works:

pull-expr = ['pull' src-var variable pattern]

I have a self-contained code example here, which demonstrates a use-case, where an entity is split between 2 Datomic databases, for privacy reasons:

https://forum.datomic.com/t/pull-db-entity-pattern-is-undocumented/2299

Is this variant of the pull-expr in Datalog queries are not supported officially?

Should I use it in production or does it have some undefined behaviour, compared to its binary arity variant?

Or the documentation is just incomplete?

Answered: Pulling :db/id will pull the entire entity

Fri, 14 Jul 2023 15:53:05 +0000

This bug boxes me in a corner ... I don't know the "type" of the entity whose :db/id I'm trying to pull, so I can't add an addtional attribute to work around the problem. And just using [*] has the big liability noted in the report above.

Datomic Cloud IAM role drift on setup - is this normal?

Wed, 12 Jul 2023 09:34:33 +0000

hi, just set up DC for the first time (ran the two AWS cloudformation templates). The storage stack is showing drift on the IAM managed policy datomic-admin-..., shows 'MODIFIED', in red. Is this normal upon setup? (checking the changes in the 'versions' tab, the difference is addition of autoscaling and s3 actions to the policy; the second version, presumably causing the 'drift', was added during the provisioning). Is this just a setup artifact nothing to worry about?

Answered: How create more one production compute?

Wed, 05 Jul 2023 14:35:00 +0000

Hi @Tatiana,

If you are looking to add more compute to a Datomic Cloud system you have a few options:

You can increase the compute size of your compute nodes. https://docs.datomic.com/cloud/operation/growing-your-system.html
You can add more compute nodes via ASG (however, you will not see much benefits to scaling compute this way on a single DB system).
This is probably, what you want... you can launch a query group against the same storage stack. (https://docs.datomic.com/cloud/operation/growing-your-system.html#task-specific-query-groups) with more docs here explaining that query groups are a kind of compute group: https://docs.datomic.com/cloud/whatis/architecture.html#compute-groups

Let me know if you have questions or more information on what specifically you are hoping to scale.

Cheers,
Jaret

Answered: Duplicate var in :find and :with throws ArrayIndexOutOfBoundsException

Sun, 28 May 2023 21:30:11 +0000

(Not an answer, but another example of the scope of this bug.)

I think the same underlying error can be provoked when using pull and not using with.

(d/q {:query '[:find ?c (pull ?c [*])

                   :where 
                   , [?c :ansi.fips/state-numeric "51"]
                   , [?c :usps/state-name ?sn]]
          :args [db]})

That ^ provokes the IndexOutOfBoundsException but it can be resolved by removing either the pull or the bare ?c from the find expression. This is frustrating for automated query construction.

(And I've given up trying to get the code sample to format correctly... the embedded quote in the code wreaks havoc with this site's formatter....)

Answered: Is there only one deployment target for ions?

Fri, 19 May 2023 13:35:34 +0000

Hi Phil!

When you create a primary compute group or query group, you associate it with a Code Deploy application. The :app-name in your ion-config.edn connects your code to a Code Deploy application and determines which compute groups you can deploy to.

If you are interested in deploying multiple Ions to the same "system" you could spin up a dedicated query group per app-name and deploy to those targets.

Cheers,
Jaret

Answered: Will dev-local be available in Maven Central?

Fri, 19 May 2023 13:31:54 +0000

Hi Byron!

We're moving in that direction. But the next task we are working on is freeing Datomic Cloud. I do not yet have details for dev-local, but changes are coming.

Cheers,
Jaret

Answered: Why is this error message saying the entity can't be resolved?

Fri, 19 May 2023 13:20:22 +0000

Hi Chris,

What is the schema for :shape/source-shape? And can you query it? I am suspect of this being related to the data type and unable to resolve the bigInt. Also what version of Datomic are you using?

(d/q '[:find ?e
         :where [?e :shape/source-shape 1.7592186046217E13]]
       (d/db conn) )

Cheers,
Jaret

Answered: Support for DynamoDB compatible services

Fri, 19 May 2023 13:15:54 +0000

Mikhail,

Could you explain what you are actually trying to do? Are you trying to use YDB as the underlying storage for Datomic? If so, why as in what specific properties are you interested in?

Datomic pro uses all underlying storages in the same way as KV store. Given that YDB is SQL you may already be able to get it running by following our SQL docs however, we have not tested YDB or evalutated if that storage is different enough to warrant it's own protocol and if that storage stack would have the requirements of a Datomic DB. From reading the marketing on the site, it does indicate that it is strongly consistent which is the primary requirement for configuring a table space

Or are you trying to utilize YDB from a Datomic system you are operating?

Answered: How much does Datomic Pro Edition cost?

Sun, 30 Apr 2023 20:38:08 +0000

License is free. There are still support contracts available.

https://docs.datomic.com/pro/releases.html

Datomic Knowledgebase - Recent questions and answers

Answered: Datomic peer on dynamodb - misleading error message

Answered: Datomic on JDK25 - WARNING: A terminally deprecated method in sun.misc.Unsafe has been called

Answered: Datomic on JDK25 - WARNING: A restricted method in java.lang.System has been called

Answered: Datomic peer - Support SSO

Answered: Datomic Pro's executable shell scripts (e.g. transactor.sh) fail on NixOS

Answered: Why does changing the #inst reader make my query fail?

Answered: 500 errors from api gateway for large Ion responses

Using a collection of datoms as input to a query

Answered: Why does Datomic store all databases in a single datomic_kvs table instead of having a separate table per database?

Answered: "No suitable driver" when starting peer

Answered: datomic's spymemcached fork collides with original

Answered: Regression in latest datomic when transacting data & schema in one tx

Answered: how do I connect to a datomic transactor from a tomcat servlet?

Answered: How to deprecate a composite tuple?

Answered: transactor on-prem logging

Answered: import-cloud fails with "No reader function for tag object"

Answered: Why does Datomic block shutting down when using :timeout in d/query?

Answered: Dockerize Datomic

Answered: is there a "un-divert" to undo divert-system

Answered: How to write the Metaschema file?

Answered: http-direct configuation not working as per tutorials

Answered: equality on d/entity ignores db

Using Valcache via Docker bind mounts

Answered: How do I restart a gc-deleted-dbs after it got canceled in "Deleting garbage segments" phase?

Possibly security issue with the dev H2 storage?

Answered: Are DB values obtained from a single conn guaranteed to include transactions submitted against the same connection?

Answered: Why is the pull pattern for wild card giving me an error?

Answered: Multiple CVEs are reported on Datomic Peer 1.0.7075

Answered: how to run a dev transactor from the same process as a peer?

Answered: java.lang.IllegalStateException: Can't set!: *io-index* from non-binding thread

Answered: Can I run recent versions of Datomic in Windows?

Answered: Is it possible to run a transactor within the scope of my application?

Answered: Is it possible to separate Datomic On-Prem from Cloud?

Answered: Database functions, Classpath functions, and Transaction functions

Answered: Support java.time.instant

Answered: Is there way to use s3 compatible backup storage

Answered: Equivalents for d/with; transaction function test scaffold story when using cloud

Answered: Why do values of :db.type/uri return as com.cognitect.transit.impl.URIImpl?

How to change the default 1 minute jetty async servlet timeout?

Answered: Why does :db/ensure appear as an attribute in my entities?

Is `(pull $db2 ?e [*])` supported officially?

Answered: Pulling :db/id will pull the entire entity

Datomic Cloud IAM role drift on setup - is this normal?

Answered: How create more one production compute?

Answered: Duplicate var in :find and :with throws ArrayIndexOutOfBoundsException

Answered: Is there only one deployment target for ions?

Answered: Will dev-local be available in Maven Central?

Answered: Why is this error message saying the entity can't be resolved?

Answered: Support for DynamoDB compatible services

Answered: How much does Datomic Pro Edition cost?

Answered: java.lang.IllegalStateException: Can't set!: io-index from non-binding thread