{"id":1553,"date":"2026-04-08T03:43:39","date_gmt":"2026-04-08T03:43:39","guid":{"rendered":"https:\/\/www.viz-note.com\/in\/case-study-disaster-recovery-flawed-erd\/"},"modified":"2026-04-08T03:43:39","modified_gmt":"2026-04-08T03:43:39","slug":"case-study-disaster-recovery-flawed-erd","status":"publish","type":"post","link":"https:\/\/www.viz-note.com\/in\/case-study-disaster-recovery-flawed-erd\/","title":{"rendered":"\u0906\u092a\u0926\u093e \u092a\u0941\u0928\u0930\u094d\u0938\u094d\u0925\u093e\u092a\u0928\u093e \u092e\u0947\u0902 \u090f\u0915 \u0905\u0927\u094d\u092f\u092f\u0928: \u090f\u0915 \u0926\u094b\u0937\u092a\u0942\u0930\u094d\u0923 \u090f\u0902\u091f\u093f\u091f\u0940 \u0938\u0902\u092c\u0902\u0927 \u0906\u0930\u0947\u0916 \u0928\u0947 \u0939\u092e\u0947\u0902 \u0924\u0940\u0928 \u0918\u0902\u091f\u0947 \u0915\u093e \u0928\u0941\u0915\u0938\u093e\u0928 \u0915\u093f\u092f\u093e"},"content":{"rendered":"<p>\u0906\u092a\u0926\u093e 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\u0915\u0947\u0935\u0932 \u0915\u094b\u0921 \u0915\u0947 \u092c\u093e\u0930\u0947 \u092e\u0947\u0902 \u0928\u0939\u0940\u0902\u0964<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Charcoal sketch infographic illustrating a disaster recovery case study: how a flawed Entity Relationship Diagram (ERD) caused a 3-hour database restoration delay, showing timeline, schema flaws (orphaned foreign keys, implicit join tables, nullability constraints), cost analysis, and best practices for ERD maintenance and data integrity\" decoding=\"async\" src=\"https:\/\/www.viz-note.com\/wp-content\/uploads\/2026\/04\/disaster-recovery-erd-case-study-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>\u0921\u0947\u091f\u093e \u0932\u091a\u0940\u0932\u0947\u092a\u0928 \u092e\u0947\u0902 ERD \u0915\u0940 \u092e\u0939\u0924\u094d\u0935\u092a\u0942\u0930\u094d\u0923 \u092d\u0942\u092e\u093f\u0915\u093e \ud83d\udee1\ufe0f<\/h2>\n<p>\u090f\u0902\u091f\u093f\u091f\u0940 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\u0935\u093f\u092b\u0932\u0924\u093e \u0915\u093e \u0938\u092e\u092f \u0930\u0947\u0916\u093e \u0939\u0948:<\/p>\n<ul>\n<li><strong>00:00<\/strong> \u2013 \u092a\u094d\u0930\u093e\u0925\u092e\u093f\u0915 \u092a\u094d\u0930\u0923\u093e\u0932\u0940 \u092e\u0947\u0902 \u0935\u093f\u092b\u0932\u0924\u093e \u0915\u093e \u092a\u0924\u093e \u091a\u0932\u093e\u0964 \u091a\u0947\u0924\u093e\u0935\u0928\u0940 \u0918\u091f\u0928\u093e \u092a\u094d\u0930\u0924\u093f\u0915\u094d\u0930\u093f\u092f\u093e \u0915\u094b \u0928\u093f\u0930\u094d\u0926\u0947\u0936\u093f\u0924 \u0915\u0930\u0924\u0940 \u0939\u0948\u0964<\/li>\n<li><strong>00:05<\/strong> \u2013 \u0907\u0902\u091c\u0940\u0928\u093f\u092f\u0930\u093f\u0902\u0917 \u091f\u0940\u092e \u0938\u0915\u094d\u0930\u093f\u092f \u0915\u0940 \u0917\u0908\u0964 \u0926\u094d\u0935\u093f\u0924\u0940\u092f\u0915 \u092a\u0930\u093f\u0935\u0947\u0936 \u092e\u0947\u0902 \u092a\u0939\u0941\u0902\u091a \u0926\u0940 \u0917\u0908\u0964<\/li>\n<li><strong>00:15<\/strong> \u2013 \u0926\u0938\u094d\u0924\u093e\u0935\u0947\u091c\u0940\u0915\u0930\u0923 ERD \u0915\u0947 \u0906\u0927\u093e\u0930 \u092a\u0930 \u092a\u0941\u0928\u0930\u094d\u0938\u094d\u0925\u093e\u092a\u0928 \u0938\u094d\u0915\u094d\u0930\u093f\u092a\u094d\u091f \u0936\u0941\u0930\u0942 \u0915\u0940 \u0917\u0908\u0964<\/li>\n<li><strong>00:25<\/strong> \u2013 \u0938\u094d\u0915\u094d\u0930\u093f\u092a\u094d\u091f \u0930\u0941\u0915 \u0917\u0908\u0964 \u0935\u093f\u0926\u0947\u0936\u0940 \u0915\u0941\u0902\u091c\u0940 \u092a\u094d\u0930\u0924\u093f\u092c\u0902\u0927 \u0909\u0932\u094d\u0932\u0902\u0918\u0928 \u0915\u093e \u092a\u0924\u093e \u091a\u0932\u093e\u0964<\/li>\n<li><strong>00:30<\/strong> \u2013 \u091c\u093e\u0902\u091a \u0936\u0941\u0930\u0942 \u0939\u0941\u0908\u0964 ERD \u0914\u0930 \u0932\u093e\u0907\u0935 \u0938\u094d\u0915\u0940\u092e\u093e \u0915\u0947 \u092c\u0940\u091a \u0905\u0902\u0924\u0930 \u092a\u093e\u092f\u093e \u0917\u092f\u093e\u0964<\/li>\n<li><strong>01:30<\/strong> \u2013 \u0938\u094d\u0915\u0940\u092e\u093e \u092a\u0948\u091a\u093f\u0902\u0917 \u0914\u0930 \u0939\u093e\u0925 \u0938\u0947 \u0921\u0947\u091f\u093e \u0938\u092e\u0928\u094d\u0935\u092f\u0928 \u0936\u0941\u0930\u0942 \u0915\u093f\u092f\u093e \u0917\u092f\u093e\u0964<\/li>\n<li><strong>03:00<\/strong> \u2013 \u092a\u094d\u0930\u0923\u093e\u0932\u0940 \u0938\u0902\u091a\u093e\u0932\u0928 \u0905\u0935\u0938\u094d\u0925\u093e \u092e\u0947\u0902 \u092a\u0941\u0928\u0930\u094d\u0938\u094d\u0925\u093e\u092a\u093f\u0924 \u0915\u0930 \u0926\u0940 \u0917\u0908\u0964<\/li>\n<\/ul>\n<p>\u0924\u0940\u0928 \u0918\u0902\u091f\u0947 \u0915\u0940 \u0926\u0947\u0930\u0940 \u0928\u0947\u091f\u0935\u0930\u094d\u0915 \u0932\u0947\u091f\u0947\u0902\u0938\u0940 \u092f\u093e \u0939\u093e\u0930\u094d\u0921\u0935\u0947\u092f\u0930 \u0915\u0940 \u0927\u0940\u092e\u0940 \u0917\u0924\u093f \u0915\u0947 \u0915\u093e\u0930\u0923 \u0928\u0939\u0940\u0902 \u0939\u0941\u0908 \u0925\u0940\u0964 \u0907\u0938\u0915\u093e \u0915\u093e\u0930\u0923 \u0921\u093f\u091c\u093c\u093e\u0907\u0928 \u0926\u0938\u094d\u0924\u093e\u0935\u0947\u091c\u093c \u0914\u0930 \u092d\u094c\u0924\u093f\u0915 \u0935\u093e\u0938\u094d\u0924\u0935\u093f\u0915\u0924\u093e \u0915\u0947 \u092c\u0940\u091a \u0915\u0940 \u0924\u093e\u0930\u094d\u0915\u093f\u0915 \u0905\u0902\u0924\u0930\u093e\u0932 \u0925\u0940\u0964 \ud83e\udde9<\/p>\n<h2>\u092a\u0939\u091a\u093e\u0928\u0947 \u0917\u090f \u0935\u093f\u0936\u093f\u0937\u094d\u091f \u0938\u094d\u0915\u0940\u092e\u093e \u0926\u094b\u0937 \ud83d\udd0d<\/h2>\n<p>ERD \u0915\u0947 \u0916\u093f\u0932\u093e\u092b \u0932\u093e\u0907\u0935 \u0921\u0947\u091f\u093e\u092c\u0947\u0938 \u0915\u0940 \u091c\u093e\u0902\u091a \u0915\u0930\u0928\u0947 \u092a\u0930, \u0939\u092e\u0928\u0947 \u0924\u0940\u0928 \u092e\u0939\u0924\u094d\u0935\u092a\u0942\u0930\u094d\u0923 \u0905\u0902\u0924\u0930\u093e\u0932 \u092a\u093e\u090f\u0964 \u092f\u0947 \u0938\u093f\u0902\u091f\u0948\u0915\u094d\u0938 \u0924\u094d\u0930\u0941\u091f\u093f\u092f\u093e\u0902 \u0928\u0939\u0940\u0902 \u0925\u0940\u0902; \u092f\u0947 \u0924\u093e\u0930\u094d\u0915\u093f\u0915 \u0932\u093e\u092a\u0930\u0935\u093e\u0939\u093f\u092f\u093e\u0902 \u0925\u0940\u0902 \u091c\u094b \u0924\u092c \u0938\u094d\u092a\u0937\u094d\u091f \u0939\u0941\u0908\u0902 \u091c\u092c \u0938\u093f\u0938\u094d\u091f\u092e \u0930\u093f\u0932\u0947\u0936\u0928\u0936\u093f\u092a \u0915\u094b \u0932\u093e\u0917\u0942 \u0915\u0930\u0928\u0947 \u0915\u0940 \u0915\u094b\u0936\u093f\u0936 \u0915\u0930\u0928\u0947 \u0932\u0917\u093e\u0964<\/p>\n<h3>1. \u0905\u0928\u093e\u0925 \u0935\u093f\u0926\u0947\u0936\u0940 \u0915\u0941\u0902\u091c\u093f\u092f\u093e\u0902<\/h3>\n<p>ERD \u0928\u0947 \u090f\u0915 \u0938\u0916\u094d\u0924 \u090f\u0915-\u0938\u0947-\u092c\u0939\u0941\u0924 \u0915\u0947 \u0938\u0902\u092c\u0902\u0927 \u0915\u0947 \u092c\u0940\u091a \u091a\u093f\u0924\u094d\u0930\u093f\u0924 \u0915\u093f\u092f\u093e \u0925\u093e<code>\u0906\u0926\u0947\u0936<\/code> \u0914\u0930 <code>\u0906\u0926\u0947\u0936 \u0906\u0907\u091f\u092e<\/code>. \u0939\u093e\u0932\u093e\u0902\u0915\u093f, \u0935\u093e\u0938\u094d\u0924\u0935\u093f\u0915 \u0921\u0947\u091f\u093e\u092c\u0947\u0938 \u092e\u0947\u0902 \u092a\u0941\u0930\u093e\u0928\u0947 \u0921\u0947\u091f\u093e \u0925\u093e \u091c\u0939\u093e\u0902 <code>\u0906\u0926\u0947\u0936 \u0906\u0907\u091f\u092e<\/code> \u090f\u0915 \u0938\u0902\u092c\u0902\u0927\u093f\u0924 <code>\u0906\u0926\u0947\u0936<\/code>\u0930\u093f\u0915\u0949\u0930\u094d\u0921 \u0915\u0947 \u092c\u093f\u0928\u093e \u0925\u093e \u0915\u094d\u092f\u094b\u0902\u0915\u093f \u092a\u093f\u091b\u0932\u0947 \u092e\u093e\u0907\u0917\u094d\u0930\u0947\u0936\u0928 \u0928\u0947 \u092a\u094d\u0930\u0924\u093f\u092c\u0902\u0927\u094b\u0902 \u0915\u094b \u0932\u093e\u0917\u0942 \u0928\u0939\u0940\u0902 \u0915\u093f\u092f\u093e \u0925\u093e\u0964 ERD \u0928\u0947 \u0907\u0938 \u0905\u0928\u093e\u0925 \u0905\u0935\u0938\u094d\u0925\u093e \u0915\u094b \u0927\u094d\u092f\u093e\u0928 \u092e\u0947\u0902 \u0928\u0939\u0940\u0902 \u0930\u0916\u093e \u0925\u093e\u0964 \u091c\u092c \u0930\u093f\u0938\u094d\u091f\u094b\u0930 \u0938\u094d\u0915\u094d\u0930\u093f\u092a\u094d\u091f \u0928\u0947 \u0935\u093f\u0926\u0947\u0936\u0940 \u0915\u0941\u0902\u091c\u0940 \u0915\u094b \u092b\u093f\u0930 \u0938\u0947 \u0938\u094d\u0925\u093e\u092a\u093f\u0924 \u0915\u0930\u0928\u0947 \u0915\u0940 \u0915\u094b\u0936\u093f\u0936 \u0915\u0940, \u0924\u094b \u0921\u0947\u091f\u093e\u092c\u0947\u0938 \u0928\u0947 \u0921\u0947\u091f\u093e \u0915\u094b \u0905\u0938\u094d\u0935\u0940\u0915\u093e\u0930 \u0915\u0930 \u0926\u093f\u092f\u093e \u0915\u094d\u092f\u094b\u0902\u0915\u093f \u092e\u093e\u0924\u0943 \u0930\u093f\u0915\u0949\u0930\u094d\u0921 \u0917\u093e\u092f\u092c \u0925\u093e \u092f\u093e \u092a\u094d\u0930\u0924\u093f\u092c\u0902\u0927 \u0915\u094b \u0926\u0938\u094d\u0924\u093e\u0935\u0947\u091c\u093c \u092e\u0947\u0902 \u092c\u0924\u093e\u090f \u0917\u090f \u0924\u0930\u0940\u0915\u0947 \u0938\u0947 \u0932\u093e\u0917\u0942 \u0928\u0939\u0940\u0902 \u0915\u093f\u092f\u093e \u0917\u092f\u093e \u0925\u093e\u0964<\/p>\n<h3>2. \u0905\u092a\u094d\u0930\u0924\u094d\u092f\u0915\u094d\u0937 \u091c\u0949\u0907\u0928 \u0924\u093e\u0932\u093f\u0915\u093e\u090f\u0902<\/h3>\n<p>\u090f\u0915 \u092c\u0939\u0941-\u0938\u0947-\u092c\u0939\u0941 \u0938\u0902\u092c\u0902\u0927 \u0915\u094b ERD \u092e\u0947\u0902 \u0926\u094b \u0924\u093e\u0932\u093f\u0915\u093e\u0913\u0902 \u0915\u0947 \u092c\u0940\u091a \u0938\u0940\u0927\u0947 \u0938\u0902\u092c\u0902\u0927 \u0915\u0947 \u0930\u0942\u092a \u092e\u0947\u0902 \u0926\u0930\u094d\u0936\u093e\u092f\u093e \u0917\u092f\u093e \u0925\u093e\u0964 \u092d\u094c\u0924\u093f\u0915 \u0915\u093e\u0930\u094d\u092f\u093e\u0928\u094d\u0935\u092f\u0928 \u092e\u0947\u0902, \u0907\u0938\u0947 \u090f\u0915 \u091c\u0902\u0915\u094d\u0936\u0928 \u0924\u093e\u0932\u093f\u0915\u093e \u0915\u0947 \u092e\u093e\u0927\u094d\u092f\u092e \u0938\u0947 \u0938\u0902\u092d\u093e\u0932\u093e \u0917\u092f\u093e \u0925\u093e\u0964 \u0930\u093f\u0938\u094d\u091f\u094b\u0930\u0947\u0936\u0928 \u0924\u0930\u094d\u0915 \u0928\u0947 \u0938\u0940\u0927\u0947 \u0938\u0902\u092c\u0902\u0927 \u0915\u0940 \u0905\u092a\u0947\u0915\u094d\u0937\u093e \u0915\u0940 \u0914\u0930 \u0917\u0932\u0924 \u0915\u0949\u0932\u092e \u092e\u0947\u0902 \u0921\u0947\u091f\u093e \u0921\u093e\u0932\u0928\u0947 \u0915\u0940 \u0915\u094b\u0936\u093f\u0936 \u0915\u0940\u0964 \u0907\u0938\u0938\u0947 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u0947 \u0905\u0938\u0902\u0917\u0924\u093f \u0924\u094d\u0930\u0941\u091f\u093f\u092f\u094b\u0902 \u0915\u093e \u090f\u0915 \u0936\u094d\u0930\u0943\u0902\u0916\u0932\u093e \u092c\u0928\u0940 \u091c\u093f\u0938\u0915\u0947 \u0932\u093f\u090f \u0939\u0938\u094d\u0924\u093e\u0915\u094d\u0937\u0930\u093f\u0924 \u0938\u094d\u0915\u0940\u092e\u093e \u092a\u0930\u093f\u0935\u0930\u094d\u0924\u0928 \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0925\u0940\u0964<\/p>\n<h3>3. \u0928\u0949\u0932 \u0905\u0928\u0941\u092e\u0924\u093f \u092a\u094d\u0930\u0924\u093f\u092c\u0902\u0927<\/h3>\n<p>ERD \u0928\u0947 \u0907\u0902\u0917\u093f\u0924 \u0915\u093f\u092f\u093e \u0915\u093f \u0915\u0908 \u092b\u093c\u0940\u0932\u094d\u0921 \u0935\u0948\u0915\u0932\u094d\u092a\u093f\u0915 (\u0928\u0949\u0932 \u0905\u0928\u0941\u092e\u0924) \u0925\u0947\u0964 \u0939\u093e\u0932\u093e\u0902\u0915\u093f, \u0909\u0924\u094d\u092a\u093e\u0926\u0928 \u0938\u094d\u0915\u0940\u092e\u093e \u0915\u094b \u0938\u092e\u092f \u0915\u0947 \u0938\u093e\u0925 \u0921\u0947\u091f\u093e \u0917\u0941\u0923\u0935\u0924\u094d\u0924\u093e \u0915\u0947 \u0909\u0926\u094d\u0926\u0947\u0936\u094d\u092f \u0938\u0947 \u0917\u0948\u0930-\u0928\u0949\u0932 \u092e\u093e\u0928\u094b\u0902 \u0915\u094b \u0932\u093e\u0917\u0942 \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0905\u092a\u0921\u0947\u091f \u0915\u093f\u092f\u093e \u0917\u092f\u093e \u0925\u093e\u0964 ERD \u0915\u094b \u0907\u0938 \u092c\u0926\u0932\u093e\u0935 \u0915\u094b \u0926\u0930\u094d\u0936\u093e\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0905\u092a\u0921\u0947\u091f \u0928\u0939\u0940\u0902 \u0915\u093f\u092f\u093e \u0917\u092f\u093e \u0925\u093e\u0964 \u0930\u093f\u0938\u094d\u091f\u094b\u0930\u0947\u0936\u0928 \u0915\u0947 \u0926\u094c\u0930\u093e\u0928, \u0938\u094d\u0915\u094d\u0930\u093f\u092a\u094d\u091f \u0928\u0947 \u0917\u0948\u0930-\u0928\u0949\u0932 \u0915\u0949\u0932\u092e \u092e\u0947\u0902 NULL \u092e\u093e\u0928 \u0921\u093e\u0932\u0928\u0947 \u0915\u0940 \u0915\u094b\u0936\u093f\u0936 \u0915\u0940, \u091c\u093f\u0938\u0938\u0947 \u0932\u0947\u0928\u0926\u0947\u0928 \u0915\u0947 \u0924\u0941\u0930\u0902\u0924 \u0930\u0926\u094d\u0926 \u0939\u094b\u0928\u0947 \u0915\u093e \u092a\u0930\u093f\u0923\u093e\u092e \u0939\u0941\u0906\u0964<\/p>\n<p>\u0907\u0928 \u0905\u0902\u0924\u0930\u093e\u0932\u094b\u0902 \u0928\u0947 \u0924\u0915\u0928\u0940\u0915\u0940 \u0926\u0938\u094d\u0924\u093e\u0935\u0947\u091c\u093c\u0928 \u092e\u0947\u0902 \u090f\u0915 \u0938\u093e\u092e\u093e\u0928\u094d\u092f \u0938\u092e\u0938\u094d\u092f\u093e \u0915\u094b \u0909\u091c\u093e\u0917\u0930 \u0915\u093f\u092f\u093e \u0939\u0948: <strong>\u0926\u0938\u094d\u0924\u093e\u0935\u0947\u091c\u093c\u0928 \u0935\u093f\u091a\u0932\u0928<\/strong>\u0964 \u091c\u0948\u0938\u0947-\u091c\u0948\u0938\u0947 \u0938\u093f\u0938\u094d\u091f\u092e \u0935\u093f\u0915\u0938\u093f\u0924 \u0939\u094b\u0924\u093e \u0939\u0948, \u0926\u0938\u094d\u0924\u093e\u0935\u0947\u091c\u093c \u092a\u0941\u0930\u093e\u0928\u093e \u0939\u094b \u091c\u093e\u0924\u093e \u0939\u0948, \u091c\u093f\u0938\u0938\u0947 \u0917\u0932\u0924 \u0938\u0941\u0930\u0915\u094d\u0937\u093e \u0915\u0940 \u092d\u093e\u0935\u0928\u093e \u092c\u0928\u0924\u0940 \u0939\u0948\u0964<\/p>\n<h2>\u0932\u093e\u0917\u0924 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0923: \u0938\u092e\u092f \u092c\u0928\u093e\u092e \u0938\u091f\u0940\u0915\u0924\u093e \ud83d\udcb0<\/h2>\n<p>\u0924\u0940\u0928 \u0918\u0902\u091f\u0947 \u0915\u0947 \u092c\u0902\u0926 \u0939\u094b\u0928\u0947 \u0915\u093e \u0935\u093f\u0924\u094d\u0924\u0940\u092f \u092a\u094d\u0930\u092d\u093e\u0935 \u092e\u0939\u0924\u094d\u0935\u092a\u0942\u0930\u094d\u0923 \u0939\u0948, \u0932\u0947\u0915\u093f\u0928 \u092a\u094d\u0930\u0924\u093f\u0937\u094d\u0920\u093e \u0915\u0940 \u0932\u093e\u0917\u0924 \u0905\u0927\u093f\u0915 \u0939\u0948\u0964 \u0928\u0940\u091a\u0947 \u0926\u0947\u0930\u0940 \u0915\u0947 \u0926\u094c\u0930\u093e\u0928 \u0909\u092a\u092f\u094b\u0917 \u0915\u093f\u090f \u0917\u090f \u0938\u0902\u0938\u093e\u0927\u0928\u094b\u0902 \u0915\u093e \u0935\u093f\u0935\u0930\u0923 \u0926\u093f\u092f\u093e \u0917\u092f\u093e \u0939\u0948\u0964<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0938\u0902\u0938\u093e\u0927\u0928<\/th>\n<th>\u0938\u092e\u092f \u0909\u092a\u092f\u094b\u0917<\/th>\n<th>\u092a\u094d\u0930\u092d\u093e\u0935<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0938\u0940\u0928\u093f\u092f\u0930 \ufffd ingineers<\/td>\n<td>3 \u0918\u0902\u091f\u0947<\/td>\n<td>\u0935\u093f\u0915\u093e\u0938 \u0938\u0947 \u0909\u091a\u094d\u091a \u092a\u094d\u0930\u093e\u0925\u092e\u093f\u0915\u0924\u093e \u0935\u093f\u091a\u0932\u093f\u0924<\/td>\n<\/tr>\n<tr>\n<td>\u0938\u093f\u0938\u094d\u091f\u092e \u092c\u0902\u0926 \u0939\u094b\u0928\u093e<\/td>\n<td>3 \u0918\u0902\u091f\u0947<\/td>\n<td>\u0938\u0947\u0935\u093e \u0909\u092a\u0932\u092c\u094d\u0927\u0924\u093e 15% \u0924\u0915 \u0915\u092e \u0939\u094b \u0917\u0908<\/td>\n<\/tr>\n<tr>\n<td>\u0921\u0947\u091f\u093e \u0938\u092e\u0928\u094d\u0935\u092f\u0928<\/td>\n<td>1.5 \u0918\u0902\u091f\u0947<\/td>\n<td>\u092e\u0948\u0928\u094d\u092f\u0941\u0905\u0932 \u0938\u0924\u094d\u092f\u093e\u092a\u0928 \u0906\u0935\u0936\u094d\u092f\u0915 \u0939\u0948<\/td>\n<\/tr>\n<tr>\n<td>\u0926\u0938\u094d\u0924\u093e\u0935\u0947\u091c\u093c \u0905\u0926\u094d\u092f\u0924\u0928<\/td>\n<td>0.5 \u0918\u0902\u091f\u0947<\/td>\n<td>\u0918\u091f\u0928\u093e \u0915\u0947 \u092c\u093e\u0926 \u0915\u0940 \u092a\u0915\u0921\u093c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u0924\u093e\u0932\u093f\u0915\u093e \u0926\u0930\u094d\u0936\u093e\u0924\u0940 \u0939\u0948 \u0915\u093f \u0932\u093e\u0917\u0924 \u0915\u093e \u0905\u0927\u093f\u0915\u093e\u0902\u0936 \u0939\u093f\u0938\u094d\u0938\u093e \u0930\u093f\u0938\u094d\u091f\u094b\u0930 \u0915\u0930\u0928\u0947 \u0915\u0947 \u0905\u092a\u0928\u0947 \u0906\u092a \u092e\u0947\u0902 \u0928\u0939\u0940\u0902 \u0925\u093e, \u092c\u0932\u094d\u0915\u093f \u0925\u093e <em>\u0938\u0941\u0927\u093e\u0930<\/em> \u0930\u093f\u0938\u094d\u091f\u094b\u0930 \u0915\u0947\u0964 \u092f\u0926\u093f ERD \u0938\u0939\u0940 \u0939\u094b\u0924\u093e, \u0924\u094b \u0930\u093f\u0938\u094d\u091f\u094b\u0930 \u092a\u0942\u0930\u0940 \u0924\u0930\u0939 \u0938\u0947 \u092c\u093f\u0928\u093e \u0915\u093f\u0938\u0940 \u0930\u0941\u0915\u093e\u0935\u091f \u0915\u0947 \u0906\u0917\u0947 \u092c\u0922\u093c\u0924\u093e\u0964<\/p>\n<h2>\u0924\u0915\u0928\u0940\u0915\u0940 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0923: \u0915\u094d\u092f\u094b\u0902 \u0938\u094d\u0915\u094d\u0930\u093f\u092a\u094d\u091f \u0935\u093f\u092b\u0932 \u0939\u0941\u0908 \ud83d\udee0\ufe0f<\/h2>\n<p>\u0924\u094d\u0930\u0941\u091f\u093f \u0915\u0940 \u0917\u0902\u092d\u0940\u0930\u0924\u093e \u0915\u094b \u0938\u092e\u091d\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f, \u0939\u092e\u0947\u0902 \u0930\u093f\u0938\u094d\u091f\u094b\u0930\u0947\u0936\u0928 \u0938\u094d\u0915\u094d\u0930\u093f\u092a\u094d\u091f \u0915\u0947 \u0921\u0947\u091f\u093e\u092c\u0947\u0938 \u0907\u0902\u091c\u0928 \u0915\u0947 \u0938\u093e\u0925 \u092c\u093e\u0924\u091a\u0940\u0924 \u0915\u0947 \u0924\u0930\u0940\u0915\u0947 \u0915\u094b \u0926\u0947\u0916\u0928\u093e \u0939\u094b\u0917\u093e\u0964 \u0938\u094d\u0915\u094d\u0930\u093f\u092a\u094d\u091f \u090f\u0915 \u092e\u093e\u0928\u0915 \u0915\u094d\u0930\u092e \u0915\u093e \u092a\u093e\u0932\u0928 \u0915\u0930\u0924\u0940 \u0925\u0940:<\/p>\n<ol>\n<li>ERD \u092a\u0930\u093f\u092d\u093e\u0937\u093e\u0913\u0902 \u0915\u0947 \u0906\u0927\u093e\u0930 \u092a\u0930 \u0924\u093e\u0932\u093f\u0915\u093e\u090f\u0902 \u092c\u0928\u093e\u090f\u0902\u0964<\/li>\n<li>\u092a\u094d\u0930\u0924\u093f\u092c\u0902\u0927 \u0932\u093e\u0917\u0942 \u0915\u0930\u0947\u0902 (\u092e\u0941\u0916\u094d\u092f \u0915\u0941\u0902\u091c\u093f\u092f\u093e\u0902, \u0935\u093f\u0926\u0947\u0936\u0940 \u0915\u0941\u0902\u091c\u093f\u092f\u093e\u0902)\u0964<\/li>\n<p>3. \u0921\u0947\u091f\u093e \u0921\u093e\u0932\u0947\u0902\u0964<\/p>\n<li>\u092a\u0942\u0930\u094d\u0923\u0924\u093e \u0915\u0940 \u091c\u093e\u0902\u091a \u0915\u0930\u0947\u0902\u0964<\/li>\n<\/ol>\n<p>\u091c\u092c \u0938\u094d\u0915\u094d\u0930\u093f\u092a\u094d\u091f \u091a\u0930\u0923 2 \u0924\u0915 \u092a\u0939\u0941\u0902\u091a\u0940, \u0924\u094b \u092f\u0939 \u090f\u0915 \u0935\u093f\u0926\u0947\u0936\u0940 \u0915\u0941\u0902\u091c\u0940 \u092a\u094d\u0930\u0924\u093f\u092c\u0902\u0927 \u092c\u0928\u093e\u0928\u0947 \u0915\u0940 \u0915\u094b\u0936\u093f\u0936 \u0915\u0940 \u091c\u094b \u091c\u094b\u0921\u093c\u0924\u0940 \u0939\u0948 <code>\u0924\u093e\u0932\u093f\u0915\u093e A<\/code> \u0915\u094b <code>\u0924\u093e\u0932\u093f\u0915\u093e B<\/code>\u0964 \u0921\u0947\u091f\u093e\u092c\u0947\u0938 \u0907\u0902\u091c\u0928 \u0928\u0947 \u0938\u094d\u0915\u0948\u0928 \u0915\u093f\u092f\u093e <code>\u0924\u093e\u0932\u093f\u0915\u093e B<\/code> \u092e\u094c\u091c\u0942\u0926\u093e \u0921\u0947\u091f\u093e 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\u092e\u0947\u0902 \u0926\u0930\u093e\u0930 \u0906\u0924\u0940 \u0939\u0948, \u0924\u094b \u092a\u0942\u0930\u0940 \u0938\u0902\u0930\u091a\u0928\u093e \u0916\u0924\u0930\u0947 \u092e\u0947\u0902 \u0939\u094b \u091c\u093e\u0924\u0940 \u0939\u0948\u0964 \u0939\u092e\u093e\u0930\u0947 \u0928\u0915\u094d\u0936\u094b\u0902 \u0915\u0940 \u0938\u091f\u0940\u0915\u0924\u093e \u0938\u0941\u0928\u093f\u0936\u094d\u091a\u093f\u0924 \u0915\u0930\u0928\u093e \u090f\u0915 \u092a\u094d\u0930\u0924\u093f\u0930\u094b\u0927\u0915 \u0906\u0930\u094d\u0915\u093f\u091f\u0947\u0915\u094d\u091a\u0930 \u0915\u0940 \u0913\u0930 \u092c\u0922\u093c\u0928\u0947 \u0915\u093e \u092a\u0939\u0932\u093e \u0915\u0926\u092e \u0939\u0948\u0964 \u0939\u092e\u0947\u0902 \u0915\u094b\u0921 \u092e\u0947\u0902 \u091c\u093f\u0924\u0928\u093e \u0938\u092e\u092f \u0932\u0917\u093e\u0924\u0947 \u0939\u0948\u0902, \u0909\u0924\u0928\u093e \u0939\u0940 \u0938\u092e\u092f \u0926\u0938\u094d\u0924\u093e\u0935\u0947\u091c\u093c\u0940\u0915\u0930\u0923 \u092e\u0947\u0902 \u0932\u0917\u093e\u0928\u093e \u091a\u093e\u0939\u093f\u090f\u0964<\/p>\n<h2>\u0915\u093e\u0930\u094d\u092f\u093e\u0928\u094d\u0935\u092f\u0928 \u092f\u094b\u0917\u094d\u092f \u092c\u093f\u0902\u0926\u0941\u0913\u0902 \u0915\u093e \u0938\u093e\u0930\u093e\u0902\u0936 \u2705<\/h2>\n<ul>\n<li><strong>\u0935\u0930\u094d\u0924\u092e\u093e\u0928 ERD \u0915\u0940 \u0938\u092e\u0940\u0915\u094d\u0937\u093e \u0915\u0930\u0947\u0902:<\/strong>\u0924\u0941\u0930\u0902\u0924 \u0938\u092d\u0940 \u0926\u0938\u094d\u0924\u093e\u0935\u0947\u091c\u094b\u0902 \u0915\u0940 \u0932\u093e\u0907\u0935 \u0938\u094d\u0915\u0940\u092e\u093e \u0915\u0947 \u092c\u0940\u091a \u0924\u0941\u0932\u0928\u093e \u0915\u0930\u0947\u0902\u0964<\/li>\n<li><strong>\u0938\u094d\u0915\u094d\u0930\u093f\u092a\u094d\u091f\u094d\u0938 \u0915\u094b \u0905\u092a\u0921\u0947\u091f \u0915\u0930\u0947\u0902:<\/strong>\u0905\u0928\u0941\u091a\u094d\u091b\u0947\u0926 \u0909\u0932\u094d\u0932\u0902\u0918\u0928\u094b\u0902 \u0915\u094b \u092c\u0947\u0939\u0924\u0930 \u0924\u0930\u0940\u0915\u0947 \u0938\u0947 \u0938\u0902\u092d\u093e\u0932\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0906\u092a\u0926\u093e \u092c\u091a\u093e\u0935 \u0938\u094d\u0915\u094d\u0930\u093f\u092a\u094d\u091f\u094d\u0938 \u092e\u0947\u0902 \u0938\u0902\u0936\u094b\u0927\u0928 \u0915\u0930\u0947\u0902\u0964<\/li>\n<li><strong>\u091f\u0940\u092e\u094b\u0902 \u0915\u094b \u092a\u094d\u0930\u0936\u093f\u0915\u094d\u0937\u093f\u0924 \u0915\u0930\u0947\u0902:<\/strong>\u0938\u0941\u0928\u093f\u0936\u094d\u091a\u093f\u0924 \u0915\u0930\u0947\u0902 \u0915\u093f \u0938\u092d\u0940 \ufffd ingineers \u0938\u094d\u0915\u0940\u092e\u093e \u0926\u0938\u094d\u0924\u093e\u0935\u0947\u091c\u0940\u0915\u0930\u0923 \u0915\u0947 \u092e\u0939\u0924\u094d\u0935 \u0915\u094b \u0938\u092e\u091d\u0947\u0902\u0964<\/li>\n<li><strong>\u0938\u094d\u0935\u091a\u093e\u0932\u093f\u0924 \u091c\u093e\u0902\u091a \u0915\u0930\u0947\u0902:<\/strong>\u0938\u094d\u0915\u0940\u092e\u093e \u0935\u093f\u091a\u0932\u0928 \u092a\u0930 \u091a\u0947\u0924\u093e\u0935\u0928\u0940 \u0926\u0947\u0928\u0947 \u0935\u093e\u0932\u0947 \u0909\u092a\u0915\u0930\u0923\u094b\u0902 \u0915\u094b \u0932\u093e\u0917\u0942 \u0915\u0930\u0947\u0902\u0964<\/li>\n<li><strong>\u0905\u0938\u092b\u0932\u0924\u093e\u0913\u0902 \u0915\u093e \u0928\u0915\u0932\u0940 \u092a\u094d\u0930\u0926\u0930\u094d\u0936\u0928 \u0915\u0930\u0947\u0902:<\/strong>\u0926\u0938\u094d\u0924\u093e\u0935\u0947\u091c\u0940\u0915\u0930\u0923 \u0915\u0940 \u0938\u091f\u0940\u0915\u0924\u093e \u0915\u093e \u092a\u0930\u0940\u0915\u094d\u0937\u0923 \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0928\u093f\u092f\u092e\u093f\u0924 \u0906\u092a\u0926\u093e \u092c\u091a\u093e\u0935 \u0905\u092d\u094d\u092f\u093e\u0938 \u0915\u0930\u0947\u0902\u0964<\/li>\n<\/ul>\n<p>\u0907\u0928 \u0905\u092d\u094d\u092f\u093e\u0938\u094b\u0902 \u0915\u093e \u092a\u093e\u0932\u0928 \u0915\u0930\u0915\u0947 \u0939\u092e \u0938\u0941\u0928\u093f\u0936\u094d\u091a\u093f\u0924 \u0915\u0930 \u0938\u0915\u0924\u0947 \u0939\u0948\u0902 \u0915\u093f \u092d\u0935\u093f\u0937\u094d\u092f \u0915\u0940 \u0918\u091f\u0928\u093e\u0913\u0902 \u0915\u094b \u092e\u093f\u0928\u091f\u094b\u0902 \u092e\u0947\u0902 \u0939\u0932 \u0915\u093f\u092f\u093e \u091c\u093e\u090f, \u0918\u0902\u091f\u094b\u0902 \u0928\u0939\u0940\u0902\u0964 \u0938\u091f\u0940\u0915\u0924\u093e \u0915\u0940 \u0932\u093e\u0917\u0924 \u0924\u094d\u0930\u0941\u091f\u093f \u0938\u0941\u0927\u093e\u0930 \u0915\u0940 \u0932\u093e\u0917\u0924 \u0938\u0947 \u092c\u0939\u0941\u0924 \u0915\u092e \u0939\u0948\u0964<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0906\u092a\u0926\u093e \u092a\u0941\u0928\u0930\u094d\u0938\u094d\u0925\u093e\u092a\u0928\u093e \u0905\u0915\u094d\u0938\u0930 \u0906\u092a\u0926\u093e \u0915\u0947 \u092c\u093e\u0930\u0947 \u092e\u0947\u0902 \u0928\u0939\u0940\u0902 \u0939\u094b\u0924\u0940 \u0939\u0948; \u092f\u0939 \u0939\u092e\u093e\u0930\u0947 \u0926\u094d\u0935\u093e\u0930\u093e \u0924\u0942\u092b\u093e\u0928 \u0906\u0928\u0947 \u0938\u0947 \u092a\u0939\u0932\u0947 \u092c\u0928\u093e\u090f \u0917\u090f \u0938\u0902\u0930\u091a\u0928\u093e\u0913\u0902 \u0915\u0940 \u0928\u093e\u091c\u0941\u0915\u0924\u093e \u0915\u0947 \u092c\u093e\u0930\u0947 \u092e\u0947\u0902 \u0939\u094b\u0924\u0940 \u0939\u0948\u0964 \u0939\u093e\u0932 \u0915\u0947 \u0918\u091f\u0928\u093e\u0915\u094d\u0930\u092e&hellip;<\/p>\n","protected":false},"author":1,"featured_media":1554,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"\u0906\u092a\u0926\u093e \u092c\u091a\u093e\u0935: \u0926\u094b\u0937\u092a\u0942\u0930\u094d\u0923 ERD \u0928\u0947 3 \u0918\u0902\u091f\u0947 \u0915\u0940 \u0915\u0940\u092e\u0924 \u091a\u0941\u0915\u093e\u0908 \u23f1\ufe0f","_yoast_wpseo_metadesc":"\u091c\u093e\u0928\u093f\u090f \u0915\u093f \u090f\u0915\u0932 \u090f\u0902\u091f\u093f\u091f\u0940 \u0930\u093f\u0932\u0947\u0936\u0928\u0936\u093f\u092a \u0921\u093e\u092f\u0917\u094d\u0930\u093e\u092e \u0924\u094d\u0930\u0941\u091f\u093f \u0928\u0947 \u092c\u091a\u093e\u0935 \u0915\u094b \u0924\u0940\u0928 \u0918\u0902\u091f\u0947 \u0924\u0915 \u0932\u0902\u092c\u093f\u0924 \u0915\u0930 \u0926\u093f\u092f\u093e\u0964 \u0938\u094d\u0915\u0940\u092e\u093e \u0905\u0916\u0902\u0921\u0924\u093e \u0914\u0930 \u0921\u0947\u091f\u093e\u092c\u0947\u0938 \u092a\u0941\u0928\u0930\u094d\u0938\u094d\u0925\u093e\u092a\u0928 \u092a\u0930 \u0917\u0939\u0928 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0923 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