{"id":5084,"date":"2025-10-09T13:48:24","date_gmt":"2025-10-09T11:48:24","guid":{"rendered":"https:\/\/www.clavis.biz\/?page_id=5084"},"modified":"2025-10-13T11:04:12","modified_gmt":"2025-10-13T09:04:12","slug":"cds-views-ddic-entity","status":"publish","type":"page","link":"https:\/\/www.clavis.biz\/en\/sap-technologies\/s-4-hana-programming-model\/cds-views-ddic-entity\/","title":{"rendered":"DDIC-basierte CDS Views and Entity-basierte CDS Views"},"content":{"rendered":"\n<div class=\"wp-block-cover alignfull\" style=\"min-height:320px;aspect-ratio:unset;\"><span aria-hidden=\"true\" class=\"wp-block-cover__background has-nv-site-bg-background-color has-background-dim-100 has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-neve-text-color-color has-text-color\">Differences and areas of application.<\/h2>\n\n\n\n<p class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-1c52e7428d39c7049861cab1886c7e46 wp-block-paragraph\">CDS Views have fundamentally changed data modeling in SAP HANA and ABAP, because with Core Data Services, data models are defined on the database rather than on the application server. CDS views are converted as database views, so that all data accesses, calculations are performed at database level. There are two main types of CDS views, each with its own advantages and disadvantages, which means they can be used for different purposes.<\/p>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-cover alignfull\" style=\"min-height:320px;aspect-ratio:unset;\"><span aria-hidden=\"true\" class=\"wp-block-cover__background has-nv-light-bg-background-color has-background-dim-100 has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left has-neve-text-color-color has-text-color\">How do DDIC-based CDS views and entity-based CDS views differ?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading has-neve-text-color-color has-text-color has-link-color wp-elements-3f9252320eb29739414c3cb1dd7d2bc4\">DDIC-based CDS Views<\/h3>\n\n\n\n<p class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-840d9621c7cf7c6f60fd097ed7e31cb5 wp-block-paragraph\">CDS views based on DDIC\u2014the data dictionary in SAP\u2014use existing tables from the database as well as classic ABAP dictionary views.<\/p>\n\n\n\n<p class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-a309582f8dd9a9dd9b12d530f29bcfbe wp-block-paragraph\">Advantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-a45a827939e07d408aa26dac269063ef\">Compatibility: Good backward compatibility with existing database objects.<\/li>\n\n\n\n<li class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-c4c07b1d7f1643bbbcbedc2bd5b9d766\">Data integrity: Inheritance of primary\/foreign key relationships.<\/li>\n\n\n\n<li class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-f59ca8897ddf558626e8deed25138c6f\">Stability: Robust and proven data models.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-d4ab7a93e68e4ad93e3110da8306eeda wp-block-paragraph\">Disadvantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-96f127ebe2a9d6a1409ea27cf968e8f2\">Less flexible: Limited modern modeling capabilities.<\/li>\n\n\n\n<li class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-5f59691d1999aa7eaabf6756fd1fe7e5\">Performance: may be slower with large amounts of data.<\/li>\n\n\n\n<li class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-f59ca8897ddf558626e8deed25138c6f\">Stability: Robust and proven data models.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading has-neve-text-color-color has-text-color has-link-color wp-elements-6a39375c6778705f854338de842c1591\">Entity-based CDS Views<\/h3>\n\n\n\n<p class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-5f8f333f3824394c80078c301f273544 wp-block-paragraph\">Entity-based CDS views are more flexible and are based on so-called \u201centities,\u201d i.e., reusable data structures.<\/p>\n\n\n\n<p class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-a309582f8dd9a9dd9b12d530f29bcfbe wp-block-paragraph\">Advantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-ab27cb763bb9ff47f393c561373dade7\">Agility: Quick adaptation to new requirements. <\/li>\n\n\n\n<li class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-3bdf816aae1989a3f88f738eadf044e1\">Advanced modeling: associations, navigation, annotations. <\/li>\n\n\n\n<li class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-e40d2c759332e8b94cbff8816160d44a\">Optimization: Improved performance by executing computationally intensive operations directly on the SAP HANA database (SAP HANA Pushdown).<\/li>\n<\/ul>\n\n\n\n<p class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-d4ab7a93e68e4ad93e3110da8306eeda wp-block-paragraph\">Disadvantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-a0545dc8f739fb7f2ede415f72e87efa\">Complexity: Requires deeper knowledge of data modeling. <\/li>\n\n\n\n<li class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-c9fdc881b54dd0b42d4c7bfb91daa33a\">Learning curve: Developers must become accustomed to new concepts<\/li>\n<\/ul>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-cover alignfull\" style=\"min-height:320px;aspect-ratio:unset;\"><span aria-hidden=\"true\" class=\"wp-block-cover__background has-nv-site-bg-background-color has-background-dim-100 has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-neve-text-color-color has-text-color\">When should you use DDIC-based CDS views and when should you use entity-based CDS views?<\/h2>\n\n\n\n<p class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-74f81a6d9490892690ee2c468db67789 wp-block-paragraph\">DDIC-based CDS views should be used for projects with a lot of legacy code and\/or when simple data models are sufficient. Another argument in favor of their use is the importance of backward compatibility. <\/p>\n\n\n\n<p class=\"has-neve-text-color-color has-text-color has-link-color wp-elements-c66f6e52162194da30645a6b59262590 wp-block-paragraph\">Entity-based CDS views have a clear advantage when agile, complex data models are in use or SAP HANA optimization is crucial.<\/p>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-cover alignfull has-nv-site-bg-color has-text-color has-link-color wp-elements-dafa78a64e9c7d3f6542dc4b1b986259\" style=\"min-height:320px;aspect-ratio:unset;\"><span aria-hidden=\"true\" class=\"wp-block-cover__background has-neve-text-color-background-color has-background-dim-100 has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-nv-site-bg-color has-text-color\">When should you use DDIC-based CDS views and when should you use entity-based CDS views?<\/h2>\n\n\n\n<p class=\"has-nv-site-bg-color has-text-color has-link-color wp-elements-213fc992769ad8b7b2ad06e533160311 wp-block-paragraph\">DDIC-based CDS views should be used for projects with a lot of legacy code and\/or when simple data models are sufficient. Another argument in favor of their use is the importance of backward compatibility. <\/p>\n\n\n\n<p class=\"has-nv-site-bg-color has-text-color has-link-color wp-elements-2425e42a1ebaaf530eb83dd7844b83ff wp-block-paragraph\">Entity-based CDS views have a clear advantage when agile, complex data models are in use or SAP HANA optimization is crucial.<\/p>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-cover alignfull\" style=\"min-height:600px;aspect-ratio:unset;\"><span aria-hidden=\"true\" class=\"wp-block-cover__background has-nv-light-bg-background-color has-background-dim-100 has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div style=\"height:80px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"600\" src=\"https:\/\/www.clavis.biz\/wp-content\/uploads\/2024\/05\/Button-HANA-pixabay-moon-1527501_1920.jpg\" alt=\"Image CDS\" class=\"wp-image-608\" style=\"width:400px\" srcset=\"https:\/\/www.clavis.biz\/wp-content\/uploads\/2024\/05\/Button-HANA-pixabay-moon-1527501_1920.jpg 600w, https:\/\/www.clavis.biz\/wp-content\/uploads\/2024\/05\/Button-HANA-pixabay-moon-1527501_1920-300x300.jpg 300w, https:\/\/www.clavis.biz\/wp-content\/uploads\/2024\/05\/Button-HANA-pixabay-moon-1527501_1920-150x150.jpg 150w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left has-neve-text-color-color has-text-color\">Core Data Services (CDS)<\/h2>\n\n\n\n<p class=\"has-text-align-left has-neve-text-color-color has-text-color wp-block-paragraph\" style=\"font-size:17px\">Data modeling with HANA Core Data Services<\/p>\n\n\n\n<div class=\"wp-block-buttons is-horizontal is-content-justification-left is-layout-flex wp-container-core-buttons-is-layout-39697d9b wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-primary\"><a class=\"wp-block-button__link wp-element-button\" 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class=\"wp-block-spacer\"><\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":4850,"parent":2750,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"default","neve_meta_container":"","neve_meta_enable_content_width":"on","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"off","neve_meta_reading_time":"","_ti_tpc_template_sync":false,"_ti_tpc_template_id":"","footnotes":""},"class_list":["post-5084","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Core Data Services (CDS)<\/title>\n<meta name=\"description\" content=\"Data modeling with Core Data Services 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