--- title: ArangoDB Blog | Jan Steemann description: After more than 30 years of playing around with 8 bit computers, assembler and scripting languages, Jan decided to move on to work in database engineering. Jan is now a senior C/C++ developer with the ArangoDB core team, being there from version 0.1. He is mostly working on performance optimization, storage engines and the querying functionality. He also wrote most of AQL (ArangoDB’s query language). --- ArangoDB 3.12 Product Release Announcement! Read the blog for details. [Read Blog](https://arangodb.com/2024/03/arangodb-3-12-performance-for-all-your-data-models/) [![logo](https://blog.arangodb.com/hs-fs/hubfs/Imported_Blog_Media/logo.png?width=301&height=50&name=logo.png "logo")](https://arango.ai) ### Why Graph [The Rise of Graph](https://arangodb.com/the-rise-of-graph/) [The Graph ML Gamechanger](https://arangodb.com/the-graph-ml-gamechanger/) [Consolidate to Graph](https://arangodb.com/graph-vs-relational/) [Graph DB Basics](https://arangodb.com/graph-database/) ### Products [Managed Graph DB](https://arangodb.com/arangograph-managedgraphdb/) [Self-Managed Graph DB](https://arangodb.com/arangograph-selfmanaged/) [Managed Graph ML](https://arangodb.com/managed-ml-graph/) [Community Edition](https://arangodb.com/community-server/) [Compare Products](https://arangodb.com/subscriptions/) ### Solutions Use Cases Industries Solution Accelerators - [Cyber/Threat Mgmt](https://arangodb.com/solutions/use-cases/cyber-threat-management/) - [Fraud Detection](https://arangodb.com/solutions/use-cases/fraud-detections/) - [Supply Chain](https://arangodb.com/solutions/use-cases/supply-chain/) - [Network Asset Management](https://arangodb.com/solutions/use-cases/network-asset-management/) - [Customer & Patient 360](https://blog.arangodb.com/solutions/use-case/customer-and-patient-360/) - [Recommendations](https://arangodb.com/solutions/use-cases/recommendations/) - [Case Management](https://blog.arangodb.com/solutions/use-case/case-management/) - [Geospatial Analysis](https://arangodb.com/solutions/use-cases/geospatial/) - [Master Data Mgmt](https://arangodb.com/solutions/use-cases/master-data-management/) - [Software & Technology](https://arangodb.com/arangodb-for-software-tech/) - [Financial Services](https://arangodb.com/arangodb-for-financial-services/) - [Tele Communication](https://arangodb.com/telecommunications-and-network/) - [E-commerce](https://arangodb.com/arangodb-for-e-commerce/) - [Healthcare](https://arangodb.com/arangodb-for-healthcare/) - [Government](https://arangodb.com/arangodb-for-government/) - [Aerospace & Defence](https://arangodb.com/arangodb-for-aerospace-defense/) - [Manufacturing](https://arangodb.com/arangodb-for-manufacturing/) - [Enterprise Knowledge Graphs](https://arangodb.com/resources/white-papers/enterprise-knowledge-graphs/) - [Entity Resolution](https://arangodb.com/entity-resolution/) - [Traceability/Lineage](https://arangodb.com/traceability-and-lineage/) - [Contexual Relevance](https://arangodb.com/contextual-relevance/) ### Developers Capabilities Integrations Differentiators - [Graph Traversals](https://arangodb.com/graph-traversals/) - [Multi-Model DB](https://arangodb.com/multi-model-db/) - [LLM + Knowledge Graph](https://arangodb.com/llm-knowledge-graph/) - [Graph ML](https://arangodb.com/managed-ml-graph/) - [Advanced Geospatial](https://arangodb.com/advanced-geospatial/) - [Document Store](https://arangodb.com/document-store/) - [Search Engine](https://arangodb.com/full-text-search-engine/) - [Security & Compliance](https://arangodb.com/security/) - 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Why Graph - [The Rise of Graph](https://arangodb.com/the-rise-of-graph/) - [The Graph ML Gamechanger](https://arangodb.com/the-graph-ml-gamechanger/) - [Consolidate to Graph](https://arangodb.com/graph-vs-relational/) - [Graph DB Basics](https://arangodb.com/graph-database/) - Products - [Managed Graph DB](https://arangodb.com/arangograph-managedgraphdb/) - [Self-Managed Graph DB](https://arangodb.com/arangograph-selfmanaged/) - [Managed Graph ML](https://arangodb.com/managed-ml-graph/) - [Community Edition](https://arangodb.com/community-server/) - [Compare Products](https://arangodb.com/subscriptions/) - Solutions - Use Cases - [Cyber/Threat Mgmt](https://arangodb.com/solutions/use-cases/cyber-threat-management/) - [Fraud Detection](https://arangodb.com/solutions/use-cases/fraud-detections/) - [Supply Chain](https://arangodb.com/solutions/use-cases/supply-chain/) - [Network Asset Management](https://arangodb.com/solutions/use-cases/network-asset-management/) - [Customer & Patient 360](https://arangodb.com/solutions/use-cases/customer-and-patient-360/) - [Recommendations](https://arangodb.com/solutions/use-cases/recommendations/) - [Case Management](https://arangodb.com/solutions/use-cases/case-management/) - [Geospatial Analysis](https://arangodb.com/solutions/use-cases/geospatial/) - [Master Data Mgmt](https://arangodb.com/solutions/use-cases/master-data-management/) - Industries - [Software & Technology](https://arangodb.com/arangodb-for-software-tech/) - [Financial Services](https://arangodb.com/arangodb-for-financial-services/) - [Tele Communication](https://arangodb.com/telecommunications-and-network/) - [E-commerce](https://arangodb.com/arangodb-for-e-commerce/) - [Healthcare](https://arangodb.com/arangodb-for-healthcare/) - [Government](https://arangodb.com/arangodb-for-government/) - [Aerospace & Defence](https://arangodb.com/arangodb-for-aerospace-defense/) - [Manufacturing](https://arangodb.com/arangodb-for-manufacturing/) - Solution Accelerators - [Enterprise Knowledge Graphs](https://arangodb.com/resources/white-papers/enterprise-knowledge-graphs/) - [Entity Resolution](https://arangodb.com/entity-resolution/) - [Traceability/Lineage](https://arangodb.com/traceability-and-lineage/) - [Contexual Relevance](https://arangodb.com/contextual-relevance/) - Customers - [All Case Studies](https://arangodb.com/solutions/solutions-customers/#all) - [Government & Cyber](https://arangodb.com/solutions/solutions-customers/#Government-Cyber) - [Manufacturing & Supply Chain](https://arangodb.com/solutions/solutions-customers/#Manufacturing-Supply-Chain) - [Healthcare & Science](https://arangodb.com/solutions/solutions-customers/#Healthcare-Science) - [Retail & Commerce](https://arangodb.com/solutions/solutions-customers/#Retail-Commerce) - [Technology](https://arangodb.com/solutions/solutions-customers/#Technology) - [Education](https://arangodb.com/solutions/solutions-customers/#Education) - [Telco](https://arangodb.com/solutions/solutions-customers/#Telco) - [Financial Services](https://arangodb.com/solutions/solutions-customers/#Financial-Services) - Learn - [Documentation](https://docs.arangodb.com/stable/) - [Developer Hub](https://developer.arangodb.com/) - [ArangoDB University](https://university.arangodb.com/) - [Blog](https://arangodb.com/blog/) - [Certification](https://arangodb.com/learn/certification/) - [Community](https://arangodb.com/community/) - [Events](https://arangodb.com/events/) - [Resources](https://arangodb.com/resources/) - [Training Center](https://arangodb.com/learn/) - Company - [About Us](https://arangodb.com/about-us/) - [Team](https://arangodb.com/about-arangodb/) - [Partners](https://arangodb.com/partners/) - [News](https://arangodb.com/news/) - [Careers](https://arangodb.applytojob.com/apply) - [Pricing](https://arangodb.com/download-major/pricing/) [**Start Free** ArangoGraph Cloud](https://dashboard.arangodb.cloud/signup?acceptedTermsAndConditions=1) [**Download Now** ArangoDB Enterprise](https://arangodb.com/download-arangodb-enterprise/) ![Vector-5](https://blog.arangodb.com/hubfs/Imported_Blog_Media/search.svg) ## [Alpha 1 of the upcoming ArangoDB 3.7](https://blog.arangodb.com/blog/2020/02/alpha-1-arangodb-3-7) February 19, 2020 Tags: [Community](https://blog.arangodb.com/blog/topic/community), [Enterprise](https://blog.arangodb.com/blog/topic/enterprise), [Releases](https://blog.arangodb.com/blog/topic/releases), [General](https://blog.arangodb.com/blog/topic/general) ![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 6 minutes Estimated reading time: 6 minutes We released ArangoDB version 3.6 in January this year, and now we are already 6 weeks into the development of its follow-up version, ArangoDB 3.7. We feel that this is a good point in time to share some of the new features of that upcoming release with you! We try not to develop new features in a vacuum, but want to solve real-world problems for our end users. To get an idea of how useful the new features are, we would like to make alpha releases available to everyone as soon as possible. Our goal is get early user feedback during the development of.. [(more…)](https://blog.arangodb.com/blog/2020/02/alpha-1-arangodb-3-7) ## [Sort-Limit Optimization in AQL](https://blog.arangodb.com/blog/2019/03/sort-limit-optimization-aql) March 07, 2019 Tags: [AQL](https://blog.arangodb.com/blog/topic/aql), [General](https://blog.arangodb.com/blog/topic/general) ![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 4 minutes Sometimes we want sorted output from a query and, for whatever reason, cannot use an index to do the sorting. In ArangoDB, we already cover this critical case with finely tuned query execution code. Sometimes though, we do not need to return all output, and follow our  `SORT`  clause with a  `LIMIT` . In ArangoDB 3.4 and earlier, we did not handle this case any differently from returning the full data, at least with respect to sorting – we would sort the full input, then apply the limit afterwards . In many cases though, it is possible to maintain just a reduced set of data in memory,.. [(more…)](https://blog.arangodb.com/blog/2019/03/sort-limit-optimization-aql) ## [Great improvements for the RocksDB Storage Engine in ArangoDB 3.4](https://blog.arangodb.com/blog/2019/01/improvements-rocksdb-storage-engine-3-4) January 31, 2019 Tags: [General](https://blog.arangodb.com/blog/topic/general), [RocksDB](https://blog.arangodb.com/blog/topic/rocksdb) ![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 2 minutes With ArangoDB 3.4 we finally made the RocksDB storage engine the default. This decision was made after a year of constant improvements to the engine to make it suitable for all our customer’s use cases. ### Improved Read / Write-Performance We massively improved the binary on-disk storage format with the 3.4 release. This format allows inserting new documents in an order that RocksDB prefers. Using the new format will reduce the number of compactions that RocksDB needs to do for the ArangoDB documents stored, allowing for better long-term insertion performance. The sustained insertion performance.. [(more…)](https://blog.arangodb.com/blog/2019/01/improvements-rocksdb-storage-engine-3-4) ## [Time traveling with graph databases](https://blog.arangodb.com/blog/2018/07/time-traveling-with-graph-databases) July 03, 2018 Tags: [Graph](https://blog.arangodb.com/blog/topic/graph), [General](https://blog.arangodb.com/blog/topic/general) ![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 19 minutes Graph databases are often used to analyze relations within highly interconnected datasets. Social networks, recommendation engines, corporate hierarchies, fraud detection or querying a bill of materials are common use cases. But these datasets change over time and you as a developer or data scientist may want to time travel and analyze these changes. While ArangoDB may not come with built-in support for managing the revision history of graph data, we’ll show in this article how to manage it in a performant manner for some general classes of graphs. Best of all, this won’t require any.. [(more…)](https://blog.arangodb.com/blog/2018/07/time-traveling-with-graph-databases) ## [Speeding Up Dump & Restore](https://blog.arangodb.com/blog/2018/06/speeding-up-dump-restore) June 07, 2018 Tags: [Performance](https://blog.arangodb.com/blog/topic/performance), [General](https://blog.arangodb.com/blog/topic/general), [RocksDB](https://blog.arangodb.com/blog/topic/rocksdb) ![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 4 minutes Many ArangoDB users rely on our \`arangodump\` and \`arangorestore\` tools as an integral part of their backup and recovery procedures. As such, we want to make the use of these tools, especially \`arangodump\`, as fast as possible. We’ve been working hard toward this goal in preparation for the upcoming 3.4 release. We’ve made a number of low-level server-side changes to significantly reduce overhead and improve throughput. Additionally, we’ve put some work into rewriting much of the code for the client tools to allow dumping and restoring collections in parallel, using a number of worker threads.. [(more…)](https://blog.arangodb.com/blog/2018/06/speeding-up-dump-restore) ## [Data retrieval performance optimizations in ArangoDB 3.3.9](https://blog.arangodb.com/blog/2018/05/data-retrieval-performance-optimizations-in-arangodb-3-3-9) May 22, 2018 Tags: [Releases](https://blog.arangodb.com/blog/topic/releases), [General](https://blog.arangodb.com/blog/topic/general), [Release](https://blog.arangodb.com/blog/topic/release) ![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 5 minutes Our recent release 3.3.9 includes several performance optimizations for data retrieval cases. Benefits can be expected for both storage engines, MMFiles and RocksDB, AQL batch lookup queries, and cluster AQL queries. [(more…)](https://blog.arangodb.com/blog/2018/05/data-retrieval-performance-optimizations-in-arangodb-3-3-9) ## [An implementation of phase-fair reader/writer locks](https://blog.arangodb.com/blog/2018/05/an-implementation-of-phase-fair-reader-writer-locks) May 03, 2018 Tags: [Performance](https://blog.arangodb.com/blog/topic/performance), [General](https://blog.arangodb.com/blog/topic/general) ![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 4 minutes We were in search for some C++ reader/writer locks implementation that allows a thread to acquire a lock and then optionally pass it on to another thread. The C++11 and C++14 standard library lock implementations [std::mutex](https://en.cppreference.com/w/cpp/named_req/Mutex) and [shared\_mutex](https://en.cppreference.com/w/cpp/named_req/SharedMutex) do not allow that (it would be undefined behaviour – by the way, it’s also undefined behaviour when doing this with the pthreads library). [(more…)](https://blog.arangodb.com/blog/2018/05/an-implementation-of-phase-fair-reader-writer-locks) ## [Configuring ArangoDB-PHP to use active failover](https://blog.arangodb.com/blog/2018/03/arangodb-php-active-failover) March 08, 2018 Tags: [Cluster](https://blog.arangodb.com/blog/topic/cluster), [Drivers](https://blog.arangodb.com/blog/topic/drivers), [PHP](https://blog.arangodb.com/blog/topic/php), [General](https://blog.arangodb.com/blog/topic/general), [Tutorial](https://blog.arangodb.com/blog/topic/tutorial) ![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 4 minutes This article is about setting up active failover for [ArangoDB-PHP](https://docs.arangodb.com/3.11/develop/drivers/), the PHP client driver for ArangoDB. It requires ArangoDB-PHP 3.3.2 or higher, and an [ArangoDB server version of 3.3.4](https://arangodb.com/download/) or higher. **Interested in trying out ArangoDB?** Fire up your cluster in just a few clicks with ArangoDB ArangoGraph: the Cloud Service for ArangoDB. [Start your free 14-day trial here](https://cloud.arangodb.com/home?utm_source=arangodb_website&utm_medium=cluster_blogpost&utm_campaign=traffic) [(more…)](https://blog.arangodb.com/blog/2018/03/arangodb-php-active-failover) ## [Index types and how indexes are used in ArangoDB: Part II](https://blog.arangodb.com/blog/2018/03/index-types-indexes-used-arangodb-part-2) March 01, 2018 Tags: [Performance](https://blog.arangodb.com/blog/topic/performance), [geo](https://blog.arangodb.com/blog/topic/geo), [General](https://blog.arangodb.com/blog/topic/general), [RocksDB](https://blog.arangodb.com/blog/topic/rocksdb) ![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 9 minutes In the first part of this article we dived deep into what indexes are currently available in ArangoDB (3.2 and 3.3), also briefly looking at what improvements are coming with ArangoDB 3.4. [Read Part I here](https://blog.arangodb.com/blog/2018/02/indexes-types-arangodb-part-1). In this Part II, we are going to focus on how to actually add indexes to a data model and speed up specific queries. ### Adding indexes to the data model The goal of adding an extra index to the data model is to speed up a certain query or even multiple queries. One of the first things that should be done during development of AQL queries should be to review the output of the `explain` command... [(more…)](https://blog.arangodb.com/blog/2018/03/index-types-indexes-used-arangodb-part-2) ## [Index types and how indexes are used in ArangoDB: Part I](https://blog.arangodb.com/blog/2018/02/indexes-types-arangodb-part-1) February 22, 2018 Tags: [Performance](https://blog.arangodb.com/blog/topic/performance), [geo](https://blog.arangodb.com/blog/topic/geo), [General](https://blog.arangodb.com/blog/topic/general), [RocksDB](https://blog.arangodb.com/blog/topic/rocksdb) ![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 10 minutes As in other database systems, indexes can be used in ArangoDB to speed up data retrieval queries, sometimes by many orders of magnitude. Getting the indexes set up the right way is essential for good query performance, so this is an important topic that affects most ArangoDB installations. [(more…)](https://blog.arangodb.com/blog/2018/02/indexes-types-arangodb-part-1) « [1](https://blog.arangodb.com/blog/author/jan-steemann/page/1) [2](https://blog.arangodb.com/blog/author/jan-steemann/page/2) [3](https://blog.arangodb.com/blog/author/jan-steemann/page/3) [4](https://blog.arangodb.com/blog/author/jan-steemann/page/4) [5](https://blog.arangodb.com/blog/author/jan-steemann/page/5) [...](https://blog.arangodb.com/blog/author/jan-steemann/page/6) [9](https://blog.arangodb.com/blog/author/jan-steemann/page/9) [»](https://blog.arangodb.com/blog/author/jan-steemann/page/2) Get the latest tutorials, blog posts and news: Tags - [General](https://blog.arangodb.com/blog/topic/general) - [Release](https://blog.arangodb.com/blog/topic/release) - [Community](https://blog.arangodb.com/blog/topic/community) - [Releases](https://blog.arangodb.com/blog/topic/releases) - [Performance](https://blog.arangodb.com/blog/topic/performance) - [Tutorial](https://blog.arangodb.com/blog/topic/tutorial) - 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