JDBM3 | Embedded Key Value Java Database | Database library

 by   jankotek Java Version: Current License: Non-SPDX

kandi X-RAY | JDBM3 Summary

kandi X-RAY | JDBM3 Summary

JDBM3 is a Java library typically used in Database applications. JDBM3 has no vulnerabilities, it has build file available and it has low support. However JDBM3 has 77 bugs and it has a Non-SPDX License. You can download it from GitHub, Maven.

All classes are contained in package org.apache..jdbm. There are only two important classes: DBMaker is builder which configures and opens database. DB is database itself, it opens collections and controls transactions. Collections in JDBM mimic their java.util counter parts. TreeMap uses an on-disk ordered auto-balanced B*Tree index, LinkedList is stored as self referencing entries and so on. Everything should be thread safe (currently under testing).
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            kandi-support Support

              JDBM3 has a low active ecosystem.
              It has 341 star(s) with 96 fork(s). There are 27 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 10 open issues and 79 have been closed. On average issues are closed in 56 days. There are 3 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of JDBM3 is current.

            kandi-Quality Quality

              OutlinedDot
              JDBM3 has 77 bugs (8 blocker, 4 critical, 22 major, 43 minor) and 1528 code smells.

            kandi-Security Security

              JDBM3 has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              JDBM3 code analysis shows 0 unresolved vulnerabilities.
              There are 25 security hotspots that need review.

            kandi-License License

              JDBM3 has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

            kandi-Reuse Reuse

              JDBM3 releases are not available. You will need to build from source code and install.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.
              JDBM3 saves you 8318 person hours of effort in developing the same functionality from scratch.
              It has 17088 lines of code, 1282 functions and 111 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed JDBM3 and discovered the below as its top functions. This is intended to give you an instant insight into JDBM3 implemented functionality, and help decide if they suit your requirements.
            • Defrag the collection
            • Reads all keys from the data input
            • Deserialize the content of a BTreeNode
            • Fetches data from a row
            • Calculates the page usage
            • Format a space usage
            • Counts the number of pages
            • Deletes a collection
            • Remove the value associated with the given key
            • Deserialize this object
            • Returns number of records stored in database
            • Clear cache if low memory on low memory
            • Serialize the BTreeNode
            • Read transaction log file
            • Read the transaction log file
            • Retrieves a map of all keys and values in the HashMap
            • Read data from file
            • Writes a page to the file
            • Adds an entry to the list
            • Writes this record in the specified output stream
            • Custom deserialization
            • Serializes this Tree
            • Create a new database
            • Copy the pages to a zip file
            • Updates the cache with specified object and serializer
            • Inserts an object into this cache
            Get all kandi verified functions for this library.

            JDBM3 Key Features

            No Key Features are available at this moment for JDBM3.

            JDBM3 Examples and Code Snippets

            No Code Snippets are available at this moment for JDBM3.

            Community Discussions

            QUESTION

            How to create or alter a DB schema dynamically (at run time) using Gramex FormHandler
            Asked 2022-Apr-08 at 06:35

            I want to be able to (at run time) create or alter a DB schema dynamically on a particular event (e.g. click of a button) using FormHandler microservice of Gramex.

            ...

            ANSWER

            Answered 2022-Apr-08 at 06:20

            You can do it using queryfunction of FormHandler which can modify the query based on the query parameters passed in the url.

            Refer the link below for more https://gramener.com/gramex/guide/formhandler/#formhandler-queryfunction

            Source https://stackoverflow.com/questions/71792397

            QUESTION

            What does stopping the runtime while uploading a dataset to Hub cause?
            Asked 2022-Mar-24 at 01:06

            I am getting the following error while trying to upload a dataset to Hub (dataset format for AI) S3SetError: Connection was closed before we received a valid response from endpoint URL: "<...>".

            So, I tried to delete the dataset and it is throwing this error below.

            CorruptedMetaError: 'boxes/tensor_meta.json' and 'boxes/chunks_index/unsharded' have a record of different numbers of samples. Got 0 and 6103 respectively.

            Using Hub version: v2.3.1

            ...

            ANSWER

            Answered 2022-Mar-24 at 01:06

            Seems like when you were uploading the dataset the runtime got interrupted which led to the corruption of the data you were trying to upload. Using force=True while deleting should allow you to delete it.

            For more information feel free to check out the Hub API basics docs for details on how to delete datasets in Hub.

            If you stop uploading a Hub dataset midway through your dataset will be only partially uploaded to Hub. So, you will need to restart the upload. If you would like to re-create the dataset, you can use the overwrite = True flag in hub.empty(overwrite = True). If you are making updates to an existing dataset, you should use version control to checkpoint the states that are in good shape.

            Source https://stackoverflow.com/questions/71595867

            QUESTION

            MongoDB query all documents contains ids that does not exist anymore in the collection
            Asked 2022-Mar-02 at 03:10

            I ran into an issue that I haven't found a solution to yet. I have a collection with dozens of documents that every one of the documents contains a list (let's use the name 'list' as a key for that list) with ids of other documents(they are connected in some way).

            some of the documents in the collection were deleted and I try to find all the documents that contain the ids of documents that do not exist anymore in the collection.

            example:

            As to the example above: I want to get the document with the id : 5e3266e9bd724a000107a902 because it contains a list with the id 5e32a7f7bd724a00012c1104 that does not exist anymore.

            ...

            ANSWER

            Answered 2022-Mar-02 at 03:10

            Here is a solution that works exploiting $lookup on the same collection (think "self-JOIN"):

            Source https://stackoverflow.com/questions/71313345

            QUESTION

            Is it possible to change the active user for a PostgreSQL connection?
            Asked 2022-Mar-02 at 02:49

            Given a connection to the PostgreSQL database for user 'Alice', is there a statement that could be executed to switch to user 'Bob'?

            Motivation: Looking to avoid having separate pools for each user (i.e. re-use a connection that was previously used by another user).

            ...

            ANSWER

            Answered 2022-Mar-01 at 22:09

            In PgAdmin open part Login/Group roles. Right click and in opened window enter new user, set permission and defined password. After refresh you will see e.g. Alice in Login/Group roles. After that open database with logged user. Click on something like mondial/postgres@PostgresSQL (db/user@server) and choose new connection. Chose which db wish to use and user wich will be connected on db.

            After that you will have mondial/Alice@PostgresSQL

            Source https://stackoverflow.com/questions/71315070

            QUESTION

            null is not an object Sqlite + ReactNative expo Typescript
            Asked 2022-Feb-28 at 12:43

            I made login page and now i'm trying to replace simple user.js to Sqlite Database (react-native-sqlite-storage). When i launch my project with database, i get this error.

            My Code

            ...

            ANSWER

            Answered 2022-Feb-28 at 12:43

            The problem consist from creating connection in separate file (must be create in App).

            Source https://stackoverflow.com/questions/71282268

            QUESTION

            Indexing for GROUP BY in CosmosDB
            Asked 2022-Feb-28 at 09:33

            As the title suggests I'm wondering how to create an effective index for GROUP BY queries in CosmosDB.

            Say the documents look something like:

            ...

            ANSWER

            Answered 2021-Sep-27 at 20:51

            Currently GROUP BY does not not yet use the index.

            This is currently being worked on. I would revisit sometime towards the end of the year to verify it is supported.

            Source https://stackoverflow.com/questions/69348335

            QUESTION

            Is there a way to implement cassandra "decimal" Datatype in Golang
            Asked 2022-Feb-15 at 12:13

            i have a database field that is set to decimal, while in my Go project i am having problem choosing which datatype can be use. each time i send a create reuquest to my code, i get a "cannot marshal 'decimal' into #golang datatype#

            this my database schema

            ...

            ANSWER

            Answered 2022-Feb-15 at 12:13

            If you look into documentation for Gocql package, then you will see that the decimal is mapped to the Go's infDec data type (see its doc) so you need to use it instead of Float64.

            Source https://stackoverflow.com/questions/71125652

            QUESTION

            How do I copy a big database table to another in ABAP?
            Asked 2022-Feb-03 at 09:29

            I want to copy one big database table to another. This is my current approach:

            ...

            ANSWER

            Answered 2022-Jan-20 at 12:45

            You can also "copy on database level" from within ABAP SQL using a combined INSERT and SELECT:

            Source https://stackoverflow.com/questions/70763128

            QUESTION

            Upgrade H2 version 2.0.202 from 1.4.200
            Asked 2022-Jan-31 at 01:05
            1. Hi, we are trying to upgrade 2.0.202 from 1.4.200. We are getting an error related to running our tests. While persisting data we are getting below error. Any suggestions?

            Caused by: org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException: NULL not allowed for column "***"; SQL statement:

            ...

            ANSWER

            Answered 2022-Jan-31 at 01:05

            You cannot use H2 2.0.202 with Hibernate ORM 5.6, because H2Dialect in Hibernate ORM produces invalid SQL for H2, H2 2.x is more restrictive and doesn't accept it by default.

            H2 2.0.204 and later versions (current version is 2.1.210) have a LEGACY compatibility mode, it can be enabled by appending ;MODE=LEGACY to JDBC URL. This mode provides some limited compatibility with old versions of H2.

            This trick shouldn't be required for Hibernate ORM 6.0 when it will be released.

            Edited

            Changes for H2 2.x.y were backported to Hibernate ORM 5.6.5.

            Source https://stackoverflow.com/questions/70818631

            QUESTION

            What are the backend service for flutter?
            Asked 2022-Jan-29 at 13:44

            I am confused in choosing database service for my flutter application. I started using firebase but as it is based on NoSQL , But if i am getting the need for rows and columns for my data which backend service should i use!.

            ...

            ANSWER

            Answered 2022-Jan-23 at 23:20

            I think it depends on how you want to access the data. If you're wanting to stream and push notifications, I would stick with Firebase. If you just need to get and post data, focus more on api implementation. With a solid rest api, you can change up your database/backend all you want and just have to update the api, not your app.

            I, personally, suggest searching around for data modeling techniques in Firebase. Check out the Fireship channel on youtube. In his channel's videos, search for modeling and you'll find a ton of info on Firebase data modeling. Many will reference Angular, but the techniques are the same.

            Source https://stackoverflow.com/questions/70827265

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install JDBM3

            You can download it from GitHub, Maven.
            You can use JDBM3 like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the JDBM3 component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

            Support

            Please report bug into Github error tracker. There is [mail-group](mailto:jdbm@googlegroups.com) if you would have questions, you may also browse [group archive](http://groups.google.com/group/jdbm). JDBM uses chained exception so user does not have to write try catch blocks. IOException is usually wrapped in IOError which is unchecked. So please always check first exception. OutOfMemoryError JDBM keeps uncommited data in memory, so you may need to commit more often. If your memory is limited use MRU cache (on by default). You may increase heap size by starting JVM with extra parameter -Xmx500MB. OutOfMemoryError: GC overhead limit exceeded Your app is creating new object instances faster then GC can collect them. When using Soft/Weak cache use Hard cache to reduce GC overhead (is auto cleared when free memory is low). There is JVM parameter to disable this assertion. File locking, OverlappingFileLockException, some IOError You are trying to open file already opened by another JDBM. Make sure that you DB.close() store correctly, operating system may leave lock after JVM is terminated. You may try DBMaker.useRandomAccessFile() which is slower, but does not use such aggressive locking. In read-only mode you can also open store multiple times. You may also disable file locks completely by DB.disableFileLock() (at your own risk of course). InternalError, Error, AssertionFailedError, IllegalArgumentException, StackOverflowError and so on There was an problem in JDBM. It is possible that file store was corrupted thanks to an internal error or disk failure. Disabling cache by DBMaker.disableCache() may workaround the problem. Please submit bug report to github. Special thanks to EJ-Technologies for donating us excellent [JProfiler](http://www.ej-technologies.com/products/overview.html).
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