--- title: Why CockroachDB doesn't use EvalPlanQual | daily.dev description: The post discusses the behavior of PostgreSQL under READ COMMITTED isolation and how CockroachDB prevents lost updates. It also explains the invariants in the... canonical: https://daily.dev/posts/why-cockroachdb-doesn-t-use-evalplanqual-fz9ncpqde twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Why CockroachDB doesn't use EvalPlanQual | daily.dev og:description: The post discusses the behavior of PostgreSQL under READ COMMITTED isolation and how CockroachDB prevents lost updates. It also explains the invariants in the... og:url: https://daily.dev/posts/why-cockroachdb-doesn-t-use-evalplanqual-fz9ncpqde og:image: https://api.daily.dev/og/posts/Fz9ncPqdE.png og:image:alt: Why CockroachDB doesn't use EvalPlanQual og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Why CockroachDB doesn't use EvalPlanQual **[CockroachDB](https://daily.dev/sources/cockroachdb)** · [@cockroachdb302](https://daily.dev/cockroachdb302) · 7 min read · 0 upvotes · 0 comments ## Summary The post discusses the behavior of PostgreSQL under READ COMMITTED isolation and how CockroachDB prevents lost updates. It also explains the invariants in the example and how CockroachDB handles application-level retries. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#postgresql](https://daily.dev/tags/postgresql), [#cockroachdb](https://daily.dev/tags/cockroachdb) [View this post on daily.dev](https://daily.dev/posts/why-cockroachdb-doesn-t-use-evalplanqual-fz9ncpqde) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Why CockroachDB doesn't use EvalPlanQual","url":"https://daily.dev/posts/why-cockroachdb-doesn-t-use-evalplanqual-fz9ncpqde","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/why-cockroachdb-doesn-t-use-evalplanqual-fz9ncpqde"},"datePublished":"2024-04-05T20:12:24.522Z","dateModified":"2024-05-09T09:21:59.549Z","description":"The post discusses the behavior of PostgreSQL under READ COMMITTED isolation and how CockroachDB prevents lost updates. It also explains the invariants in the...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/7850f4de1f410619bd768fa792eba72a?_a=AQAEufR","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/7850f4de1f410619bd768fa792eba72a?_a=AQAEufR","isAccessibleForFree":true,"articleSection":"CockroachDB","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Person","name":"Cockroach Labs","url":"https://daily.dev/cockroachdb302","image":"https://media.daily.dev/image/upload/s--7jIxBrvX--/f_auto/v1789479232/avatars/avatar_Csil5c2qFlskxGyz9CDs6?_a=BAMAMicg0","description":"Up for anything ","interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"EndorseAction"},"userInteractionCount":130}},"commentCount":0,"discussionUrl":"https://daily.dev/posts/why-cockroachdb-doesn-t-use-evalplanqual-fz9ncpqde","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"postgresql,cockroachdb","timeRequired":"PT7M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"CockroachDB","item":"https://daily.dev/sources/cockroachdb"},{"@type":"ListItem","position":3,"name":"Why CockroachDB doesn't use EvalPlanQual"}]} ```