{"id":6033,"date":"2026-07-29T07:00:00","date_gmt":"2026-07-29T04:00:00","guid":{"rendered":"https:\/\/www.dataplatform.gr\/?p=6033"},"modified":"2026-07-29T17:30:54","modified_gmt":"2026-07-29T14:30:54","slug":"ti-to-mvcc-to-vacuum-sti-vasi-dedomenon","status":"publish","type":"post","link":"https:\/\/www.dataplatform.gr\/en\/%cf%84%ce%b9-%ce%b5%ce%af%ce%bd%ce%b1%ce%b9-%cf1t-p3t84%ce%bf-mvcc-%ce%ba%ce%b1%ce%b9-%cf%84%ce%bf-vacuum-c-f%83%cf%84%ce%b7-%ce%b2%ce%ac%cf%83%ce%b7-%ce%b41t-p3tce%b5%ce%b4%ce%bf%ce%bc%ce%ad%ce%bd%cf\/","title":{"rendered":"What is MVCC and Vacuum in PostgreSQL database and how do we avoid Bloat?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">\u03a3\u03b5 \u03b1\u03c5\u03c4\u03cc \u03c4\u03bf \u03ac\u03c1\u03b8\u03c1\u03bf \u03b8\u03b1 \u03b4\u03bf\u03cd\u03bc\u03b5 \u03c0\u03ce\u03c2 \u03b7 <strong>PostgreSQL <\/strong>\u03b4\u03b9\u03b1\u03c7\u03b5\u03b9\u03c1\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03c4\u03b7 \u03c4\u03b1\u03c5\u03c4\u03cc\u03c7\u03c1\u03bf\u03bd\u03b7 \u03c0\u03c1\u03cc\u03c3\u03b2\u03b1\u03c3\u03b7 \u03bc\u03ad\u03c3\u03c9 \u03c4\u03bf\u03c5 <strong>MVCC<\/strong>, \u03c4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf <strong>Bloat<\/strong>, \u03c4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf <strong>Data Churn<\/strong>, \u03c4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf <strong>Vacuum <\/strong>\u03ba\u03b1\u03b9 \u03c0\u03ce\u03c2 \u03c4\u03bf \u03c1\u03c5\u03b8\u03bc\u03af\u03b6\u03bf\u03c5\u03bc\u03b5 \u03c3\u03c9\u03c3\u03c4\u03ac \u03bc\u03b5 \u03c4\u03bf <strong>Autovacuum<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u03a4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf MVCC (Multi-Version Concurrency Control)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>MVCC <\/strong>\u03b5\u03af\u03bd\u03b1\u03b9 \u03bf \u03bc\u03b7\u03c7\u03b1\u03bd\u03b9\u03c3\u03bc\u03cc\u03c2 \u03c0\u03bf\u03c5 \u03b5\u03c0\u03b9\u03c4\u03c1\u03ad\u03c0\u03b5\u03b9 \u03c3\u03b5 \u03bc\u03b9\u03b1 \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03bd\u03b1 \u03b5\u03be\u03c5\u03c0\u03b7\u03c1\u03b5\u03c4\u03b5\u03af \u03c4\u03b1\u03c5\u03c4\u03cc\u03c7\u03c1\u03bf\u03bd\u03b1 \u03c0\u03bf\u03bb\u03bb\u03bf\u03cd\u03c2 \u03c7\u03c1\u03ae\u03c3\u03c4\u03b5\u03c2 \u03c7\u03c9\u03c1\u03af\u03c2 \u03bd\u03b1 \u03bc\u03c0\u03bb\u03bf\u03ba\u03ac\u03c1\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c4\u03b1 reads (<code>SELECT<\/code>) \u03b1\u03c0\u03cc \u03c4\u03b1 writes (<code>INSERT<\/code>\/<code>UPDATE<\/code>\/<code>DELETE<\/code>) \u03ba\u03b1\u03b9 \u03c4\u03bf \u03b1\u03bd\u03c4\u03af\u03c3\u03c4\u03c1\u03bf\u03c6\u03bf.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u038c\u03c4\u03b1\u03bd \u03b5\u03ba\u03c4\u03b5\u03bb\u03b5\u03af\u03c4\u03b1\u03b9 \u03ad\u03bd\u03b1 <code>UPDATE<\/code> the <code>DELETE<\/code> \u03c3\u03c4\u03b7\u03bd PostgreSQL, \u03b7 \u03c0\u03b1\u03bb\u03b9\u03ac \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ae \u03b4\u03b5\u03bd \u03b4\u03b9\u03b1\u03b3\u03c1\u03ac\u03c6\u03b5\u03c4\u03b1\u03b9 \u03b1\u03bc\u03ad\u03c3\u03c9\u03c2 \u03bf\u03cd\u03c4\u03b5 \u03b5\u03c0\u03b1\u03bd\u03b5\u03b3\u03b3\u03c1\u03ac\u03c6\u03b5\u03c4\u03b1\u03b9 \u03c3\u03c4\u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7 \u03ae \u03c3\u03c4\u03bf\u03bd \u03b4\u03af\u03c3\u03ba\u03bf. \u0391\u03bd\u03c4\u03af\u03b8\u03b5\u03c4\u03b1, \u03bc\u03b1\u03c1\u03ba\u03ac\u03c1\u03b5\u03c4\u03b1\u03b9 \u03c9\u03c2 <em>dead tuple<\/em> (\u03c0\u03b1\u03bb\u03b9\u03ac \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7) \u03ba\u03b1\u03b9 \u03c0\u03b1\u03c1\u03ac\u03bb\u03bb\u03b7\u03bb\u03b1 \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03b5\u03af\u03c4\u03b1\u03b9 \u03bc\u03b9\u03b1 \u03bd\u03ad\u03b1 \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ae\u03c2 \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03c4\u03c1\u03ad\u03c7\u03bf\u03c5\u03c3\u03b1 \u03ba\u03b1\u03c4\u03ac\u03c3\u03c4\u03b1\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03b2\u03ac\u03c3\u03b7\u03c2 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u03a4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf Data Churn \u03ba\u03b1\u03b9 \u03c0\u03ce\u03c2 \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03b5\u03af\u03c4\u03b1\u03b9 \u03c4\u03bf Table Bloat<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u038c\u03c4\u03b1\u03bd \u03bc\u03b9\u03bb\u03ac\u03bc\u03b5 \u03b3\u03b9\u03b1 <strong>Data Churn<\/strong>, \u03b1\u03bd\u03b1\u03c6\u03b5\u03c1\u03cc\u03bc\u03b1\u03c3\u03c4\u03b5 \u03c3\u03c4\u03b7 \u03c3\u03c5\u03c7\u03bd\u03cc\u03c4\u03b7\u03c4\u03b1 \u03bc\u03b5 \u03c4\u03b7\u03bd \u03bf\u03c0\u03bf\u03af\u03b1 \u03b5\u03ba\u03c4\u03b5\u03bb\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 <code>UPDATE<\/code> and <code>DELETE<\/code> \u03c3\u03b5 \u03ad\u03bd\u03b1\u03bd \u03c0\u03af\u03bd\u03b1\u03ba\u03b1. \u03a0\u03af\u03bd\u03b1\u03ba\u03b5\u03c2 \u03c0\u03bf\u03c5 \u03b4\u03ad\u03c7\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c3\u03c5\u03bd\u03b5\u03c7\u03b5\u03af\u03c2 \u03b1\u03bb\u03bb\u03b1\u03b3\u03ad\u03c2 \u03ad\u03c7\u03bf\u03c5\u03bd \u03c5\u03c8\u03b7\u03bb\u03cc churn. \u0395\u03c0\u03b5\u03b9\u03b4\u03ae \u03b7 PostgreSQL \u03bb\u03cc\u03b3\u03c9 \u03c4\u03bf\u03c5 MVCC \u03b4\u03b5\u03bd \u03c5\u03c0\u03b5\u03c1\u03b3\u03c1\u03ac\u03c6\u03b5\u03b9 \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03b1\u03bb\u03bb\u03ac \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03b5\u03af \u03bd\u03ad\u03b5\u03c2 \u03b5\u03ba\u03b4\u03cc\u03c3\u03b5\u03b9\u03c2, \u03c4\u03bf \u03c5\u03c8\u03b7\u03bb\u03cc churn \u03c0\u03b1\u03c1\u03ac\u03b3\u03b5\u03b9 \u03b1\u03c3\u03c4\u03b1\u03bc\u03ac\u03c4\u03b7\u03c4\u03b1 dead tuples.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>Table \/ Index Bloat<\/strong>  \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf \u03ac\u03bc\u03b5\u03c3\u03bf \u03b1\u03c0\u03bf\u03c4\u03ad\u03bb\u03b5\u03c3\u03bc\u03b1 \u03b1\u03c5\u03c4\u03bf\u03cd \u03c4\u03bf\u03c5 \u03c6\u03b1\u03b9\u03bd\u03bf\u03bc\u03ad\u03bd\u03bf\u03c5. \u0395\u03bc\u03c6\u03b1\u03bd\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03cc\u03c4\u03b1\u03bd \u03bf \u03c6\u03c5\u03c3\u03b9\u03ba\u03cc\u03c2 \u03c7\u03ce\u03c1\u03bf\u03c2 \u03c0\u03bf\u03c5 \u03ba\u03b1\u03c4\u03b1\u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03b5\u03b9 \u03ad\u03bd\u03b1\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b1\u03c2 \u03ae \u03ad\u03bd\u03b1 \u03b5\u03c5\u03c1\u03b5\u03c4\u03ae\u03c1\u03b9\u03bf \u03c3\u03c4\u03bf \u03b4\u03af\u03c3\u03ba\u03bf \u03b5\u03af\u03bd\u03b1\u03b9 \u03c0\u03bf\u03bb\u03cd \u03bc\u03b5\u03b3\u03b1\u03bb\u03cd\u03c4\u03b5\u03c1\u03bf\u03c2 \u03b1\u03c0\u03cc \u03c4\u03bf\u03bd \u03c7\u03ce\u03c1\u03bf \u03c0\u03bf\u03c5 \u03ba\u03b1\u03c4\u03b1\u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03bf\u03c5\u03bd \u03c4\u03b1 \u03c0\u03c1\u03b1\u03b3\u03bc\u03b1\u03c4\u03b9\u03ba\u03ac, \u03b5\u03bd\u03b5\u03c1\u03b3\u03ac \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1. \u0391\u03bd \u03c4\u03bf <strong>Autovacuum <\/strong>\u03b4\u03b5\u03bd \u03c0\u03c1\u03bf\u03bb\u03b1\u03b2\u03b1\u03af\u03bd\u03b5\u03b9 \u03bd\u03b1 \u03ba\u03b1\u03b8\u03b1\u03c1\u03af\u03c3\u03b5\u03b9 \u03b1\u03c5\u03c4\u03ac \u03c4\u03b1 dead tuples, \u03b7 \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03b3\u03b5\u03bc\u03af\u03b6\u03b5\u03b9 \u03bc\u03b5 \u03ac\u03b4\u03b5\u03b9\u03bf \u03c7\u03ce\u03c1\u03bf, \u03b1\u03bd\u03b1\u03b3\u03ba\u03ac\u03b6\u03bf\u03bd\u03c4\u03b1\u03c2 \u03c4\u03b1 queries \u03bd\u03b1 \u03b4\u03b9\u03b1\u03b2\u03ac\u03b6\u03bf\u03c5\u03bd \u03c0\u03bf\u03bb\u03cd \u03c0\u03b5\u03c1\u03b9\u03c3\u03c3\u03cc\u03c4\u03b5\u03c1\u03b1 data pages \u03ba\u03b1\u03b9 \u03bd\u03b1 \u03ba\u03b1\u03b8\u03c5\u03c3\u03c4\u03b5\u03c1\u03bf\u03cd\u03bd \u03c7\u03c9\u03c1\u03af\u03c2 \u03bb\u03cc\u03b3\u03bf.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u03a3\u03cd\u03b3\u03ba\u03c1\u03b9\u03c3\u03b7 MVCC: PostgreSQL vs Oracle vs SQL Server<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a0\u03b1\u03c1\u03cc\u03bb\u03bf \u03c0\u03bf\u03c5 \u03ba\u03b1\u03b9 \u03bf\u03b9 \u03c4\u03c1\u03b5\u03b9\u03c2 \u03b2\u03ac\u03c3\u03b5\u03b9\u03c2 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03b5\u03c0\u03b9\u03c4\u03c5\u03b3\u03c7\u03ac\u03bd\u03bf\u03c5\u03bd \u03b1\u03c0\u03bf\u03bc\u03bf\u03bd\u03c9\u03bc\u03ad\u03bd\u03b1 reads \u03c7\u03c9\u03c1\u03af\u03c2 \u03ba\u03bb\u03b5\u03b9\u03b4\u03ce\u03bc\u03b1\u03c4\u03b1, \u03b7 \u03b5\u03c3\u03c9\u03c4\u03b5\u03c1\u03b9\u03ba\u03ae \u03c4\u03bf\u03c5\u03c2 \u03c5\u03bb\u03bf\u03c0\u03bf\u03af\u03b7\u03c3\u03b7 \u03b4\u03b9\u03b1\u03c6\u03ad\u03c1\u03b5\u03b9 \u03c3\u03b7\u03bc\u03b1\u03bd\u03c4\u03b9\u03ba\u03ac:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Oracle (UNDO Tablespace):<\/strong> \u039f\u03b9 \u03c0\u03b1\u03bb\u03b9\u03ad\u03c2 \u03b5\u03ba\u03b4\u03cc\u03c3\u03b5\u03b9\u03c2 \u03c4\u03c9\u03bd \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03b3\u03c1\u03ac\u03c6\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c3\u03c4\u03bf Undo Segment. \u039f \u03c0\u03af\u03bd\u03b1\u03ba\u03b1\u03c2 \u03c0\u03b5\u03c1\u03b9\u03ad\u03c7\u03b5\u03b9 \u03c0\u03ac\u03bd\u03c4\u03b1 \u03bc\u03cc\u03bd\u03bf \u03c4\u03b7\u03bd \u03c4\u03c1\u03ad\u03c7\u03bf\u03c5\u03c3\u03b1 \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7 \u03c4\u03c9\u03bd \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd.<\/li>\n\n\n\n<li><strong>SQL Server (Snapshot Isolation):<\/strong> \u03a7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af \u03c4\u03bf Row Versioning, \u03cc\u03c0\u03bf\u03c5 \u03bf\u03b9 \u03c0\u03b1\u03bb\u03b9\u03ad\u03c2 \u03b5\u03ba\u03b4\u03cc\u03c3\u03b5\u03b9\u03c2 \u03c4\u03c9\u03bd \u03b3\u03c1\u03b1\u03bc\u03bc\u03ce\u03bd \u03b4\u03b9\u03b1\u03c4\u03b7\u03c1\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 \u03c3\u03c4\u03b7\u03bd <code>tempdb<\/code> (Version Store).<\/li>\n\n\n\n<li><strong>PostgreSQL (In-Place Versioning):<\/strong> \u0394\u03b5\u03bd \u03b4\u03b9\u03b1\u03b8\u03ad\u03c4\u03b5\u03b9 \u03be\u03b5\u03c7\u03c9\u03c1\u03b9\u03c3\u03c4\u03cc UNDO tablespace. \u038c\u03bb\u03b5\u03c2 \u03bf\u03b9 \u03c0\u03b1\u03bb\u03b9\u03ad\u03c2 \u03b5\u03ba\u03b4\u03cc\u03c3\u03b5\u03b9\u03c2 \u03c4\u03c9\u03bd \u03b3\u03c1\u03b1\u03bc\u03bc\u03ce\u03bd (<em>dead tuples<\/em>) \u03b1\u03c0\u03bf\u03b8\u03b7\u03ba\u03b5\u03cd\u03bf\u03bd\u03c4\u03b1\u03b9 \u03bc\u03ad\u03c3\u03b1 \u03c3\u03c4\u03b1 \u03af\u03b4\u03b9\u03b1 \u03c4\u03b1 data files \u03c4\u03bf\u03c5 \u03c0\u03af\u03bd\u03b1\u03ba\u03b1. \u0391\u03c5\u03c4\u03cc \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03b5\u03af table &amp; index bloat, \u03ba\u03b1\u03b8\u03b9\u03c3\u03c4\u03ce\u03bd\u03c4\u03b1\u03c2 \u03c4\u03b7 \u03b4\u03b9\u03b1\u03b4\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 \u03c4\u03bf\u03c5 Vacuum \u03b1\u03c0\u03cc\u03bb\u03c5\u03c4\u03b1 \u03c5\u03c0\u03bf\u03c7\u03c1\u03b5\u03c9\u03c4\u03b9\u03ba\u03ae.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u03a0\u03ce\u03c2 \u03b2\u03c1\u03af\u03c3\u03ba\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf\u03c5\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b5\u03c2 \u03c0\u03bf\u03c5 \u03c7\u03c1\u03b5\u03b9\u03ac\u03b6\u03bf\u03bd\u03c4\u03b1\u03b9 \u03ba\u03b1\u03b8\u03ac\u03c1\u03b9\u03c3\u03bc\u03b1<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0393\u03b9\u03b1 \u03bd\u03b1 \u03b5\u03bd\u03c4\u03bf\u03c0\u03af\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c0\u03bf\u03b9\u03bf\u03c5\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b5\u03c2 \u03c0\u03c1\u03ad\u03c0\u03b5\u03b9 \u03bd\u03b1 \u03ba\u03b1\u03b8\u03b1\u03c1\u03af\u03c3\u03bf\u03c5\u03bc\u03b5, \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03bf\u03cd\u03bc\u03b5 \u03c4\u03bf view <code>pg_stat_user_tables<\/code>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a4\u03bf \u03c0\u03b1\u03c1\u03b1\u03ba\u03ac\u03c4\u03c9 query \u03b5\u03c0\u03b9\u03c3\u03c4\u03c1\u03ad\u03c6\u03b5\u03b9 \u03c4\u03bf \u03c0\u03bf\u03c3\u03bf\u03c3\u03c4\u03cc \u03c4\u03c9\u03bd dead tuples \u03ba\u03b1\u03b9 \u03c0\u03b1\u03c1\u03ac\u03b3\u03b5\u03b9 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1 \u03ad\u03c4\u03bf\u03b9\u03bc\u03bf \u03c4\u03bf query \u03c4\u03bf\u03c5<strong> <code>VACUUM ANALYSIS<\/code><\/strong> \u03b3\u03b9\u03b1 \u03ac\u03bc\u03b5\u03c3\u03b7 \u03b5\u03ba\u03c4\u03ad\u03bb\u03b5\u03c3\u03b7:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">SELECT \n    schemaname,\n    relname AS table_name,\n    n_live_tup AS live_tuples,\n    n_dead_tup AS dead_tuples,\n    -- Calculate dead tuples percentage over total rows\n    CASE \n        WHEN (n_live_tup + n_dead_tup) > 0 \n        THEN ROUND(100.0 * n_dead_tup \/ (n_live_tup + n_dead_tup), 2) \n        ELSE 0 \n    END AS dead_tuple_percent,\n    last_vacuum,\n    last_autovacuum,\n    \n    -- Ready-to-use Vacuum Analyze command for immediate execution\n    format('VACUUM ANALYZE %I.%I;', schemaname, relname) AS vacuum_cmd\n\nFROM pg_stat_user_tables\nWHERE n_dead_tup >= 0 -- Filter tables with dead tuples (change to > 1000 for stricter check)\nORDER BY dead_tuples DESC;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"409\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/07\/pgmv-01-1024x409.png\" alt=\"\" class=\"wp-image-6034\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/07\/pgmv-01-1024x409.png 1024w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/07\/pgmv-01-300x120.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/07\/pgmv-01-768x307.png 768w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/07\/pgmv-01-18x7.png 18w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/07\/pgmv-01.png 1231w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">To query \u03b5\u03c0\u03b9\u03c3\u03c4\u03c1\u03ad\u03c6\u03b5\u03b9 \u03c4\u03b1 \u03c0\u03b1\u03c1\u03b1\u03ba\u03ac\u03c4\u03c9 \u03c0\u03b5\u03b4\u03af\u03b1 \u03bc\u03b5 \u03c4\u03bf \u03ba\u03b1\u03b8\u03ad\u03bd\u03b1 \u03bd\u03b1 \u03c6\u03ad\u03c1\u03bd\u03b5\u03b9 \u03bc\u03b9\u03b1 \u03c7\u03c1\u03ae\u03c3\u03b9\u03bc\u03b7 \u03c0\u03bb\u03b7\u03c1\u03bf\u03c6\u03bf\u03c1\u03af\u03b1:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>schema name<\/code><\/strong>: \u03a4\u03bf schema \u03c3\u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03b1\u03bd\u03ae\u03ba\u03b5\u03b9 \u03bf \u03c0\u03af\u03bd\u03b1\u03ba\u03b1\u03c2 (\u03c0.\u03c7. <code>public<\/code>).<\/li>\n\n\n\n<li><strong><code>table_name<\/code><\/strong>: \u03a4\u03bf \u03cc\u03bd\u03bf\u03bc\u03b1 \u03c4\u03bf\u03c5 \u03c0\u03af\u03bd\u03b1\u03ba\u03b1.<\/li>\n\n\n\n<li><strong><code>live_tuples<\/code> (<code>n_live_tup<\/code>)<\/strong>: \u039f \u03b1\u03c1\u03b9\u03b8\u03bc\u03cc\u03c2 \u03c4\u03c9\u03bd \u03b5\u03bd\u03b5\u03c1\u03b3\u03ce\u03bd\/\u03b6\u03c9\u03bd\u03c4\u03b1\u03bd\u03ce\u03bd \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ce\u03bd.<\/li>\n\n\n\n<li><strong><code>dead_tuples<\/code> (<code>n_dead_tup<\/code>)<\/strong>: \u039f \u03b1\u03c1\u03b9\u03b8\u03bc\u03cc\u03c2 \u03c4\u03c9\u03bd \u03bd\u03b5\u03ba\u03c1\u03ce\u03bd \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ce\u03bd \u03c0\u03bf\u03c5 \u03c0\u03b5\u03c1\u03b9\u03bc\u03ad\u03bd\u03bf\u03c5\u03bd \u03ba\u03b1\u03b8\u03b1\u03c1\u03b9\u03c3\u03bc\u03cc.<\/li>\n\n\n\n<li><strong><code>dead_tuple_percent<\/code><\/strong>: \u03a4\u03bf \u03c0\u03bf\u03c3\u03bf\u03c3\u03c4\u03cc \u03c4\u03c9\u03bd \u03bd\u03b5\u03ba\u03c1\u03ce\u03bd \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ce\u03bd \u03b5\u03c0\u03af \u03c4\u03bf\u03c5 \u03c3\u03c5\u03bd\u03cc\u03bb\u03bf\u03c5 \u03c4\u03bf\u03c5 \u03c0\u03af\u03bd\u03b1\u03ba\u03b1 (\u03b4\u03b5\u03af\u03ba\u03c4\u03b7\u03c2 bloat).<\/li>\n\n\n\n<li><strong><code>last_vacuum<\/code><\/strong>: \u0397\u03bc\u03b5\u03c1\u03bf\u03bc\u03b7\u03bd\u03af\u03b1\/\u03ce\u03c1\u03b1 \u03c0\u03bf\u03c5 \u03b5\u03ba\u03c4\u03b5\u03bb\u03ad\u03c3\u03c4\u03b7\u03ba\u03b5 \u03c4\u03b5\u03bb\u03b5\u03c5\u03c4\u03b1\u03af\u03b1 \u03c6\u03bf\u03c1\u03ac \u03c7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03bf <code>VACUUM<\/code>.<\/li>\n\n\n\n<li><strong><code>last_autovacuum<\/code><\/strong>: \u0397\u03bc\u03b5\u03c1\u03bf\u03bc\u03b7\u03bd\u03af\u03b1\/\u03ce\u03c1\u03b1 \u03c0\u03bf\u03c5 \u03b5\u03ba\u03c4\u03b5\u03bb\u03ad\u03c3\u03c4\u03b7\u03ba\u03b5 \u03c4\u03b5\u03bb\u03b5\u03c5\u03c4\u03b1\u03af\u03b1 \u03c6\u03bf\u03c1\u03ac \u03c4\u03bf \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03bf <code>autovacuum<\/code>.<\/li>\n\n\n\n<li><strong><code>vacuum_cmd<\/code><\/strong>: \u0388\u03c4\u03bf\u03b9\u03bc\u03b7 \u03b5\u03bd\u03c4\u03bf\u03bb\u03ae SQL \u03c0\u03bf\u03c5 \u03c0\u03b1\u03c1\u03ac\u03b3\u03b5\u03c4\u03b1\u03b9 \u03b4\u03c5\u03bd\u03b1\u03bc\u03b9\u03ba\u03ac \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03c4\u03c1\u03ad\u03be\u03b5\u03c4\u03b5 \u03b1\u03c0\u03b5\u03c5\u03b8\u03b5\u03af\u03b1\u03c2 <code>VACUUM ANALYSIS<\/code> \u03c3\u03c4\u03bf\u03bd \u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03bf \u03c0\u03af\u03bd\u03b1\u03ba\u03b1.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Autovacuum vs Manual Vacuum<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u039f \u03ba\u03b1\u03b8\u03b1\u03c1\u03b9\u03c3\u03bc\u03cc\u03c2 \u03c3\u03c4\u03b7\u03bd PostgreSQL \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03b3\u03af\u03bd\u03b5\u03b9 \u03b5\u03af\u03c4\u03b5 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1 \u03b5\u03af\u03c4\u03b5 \u03c7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03b1:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Autovacuum<\/strong> \u03b5\u03af\u03bd\u03b1\u03b9 \u03ad\u03bd\u03b1\u03c2 \u03bc\u03b7\u03c7\u03b1\u03bd\u03b9\u03c3\u03bc\u03cc\u03c2 \u03c0\u03bf\u03c5 \u03c4\u03c1\u03ad\u03c7\u03b5\u03b9 \u03c3\u03c5\u03bd\u03b5\u03c7\u03ce\u03c2, \u03c0\u03b1\u03c1\u03b1\u03ba\u03bf\u03bb\u03bf\u03c5\u03b8\u03b5\u03af \u03c4\u03b1 \u03c3\u03c4\u03b1\u03c4\u03b9\u03c3\u03c4\u03b9\u03ba\u03ac \u03c4\u03c9\u03bd \u03c0\u03b9\u03bd\u03ac\u03ba\u03c9\u03bd \u03ba\u03b1\u03b9 \u03bc\u03cc\u03bb\u03b9\u03c2 \u03b5\u03bd\u03c4\u03bf\u03c0\u03af\u03c3\u03b5\u03b9 \u03cc\u03c4\u03b9 \u03bf \u03b1\u03c1\u03b9\u03b8\u03bc\u03cc\u03c2 \u03c4\u03c9\u03bd dead tuples \u03be\u03b5\u03c0\u03ad\u03c1\u03b1\u03c3\u03b5 \u03ad\u03bd\u03b1 \u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03bf \u03cc\u03c1\u03b9\u03bf, \u03be\u03b5\u03ba\u03b9\u03bd\u03ac\u03b5\u03b9 \u03bc\u03cc\u03bd\u03bf\u03c2 \u03c4\u03bf\u03c5 \u03c4\u03b7 \u03b4\u03b9\u03b1\u03b4\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 \u03ba\u03b1\u03b8\u03b1\u03c1\u03b9\u03c3\u03bc\u03bf\u03cd. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03c0\u03cc \u03c4\u03b7\u03bd \u03ac\u03bb\u03bb\u03b7, \u03c4\u03bf <strong>Manual Vacuum (<code>VACUUM ANALYSIS<\/code>)<\/strong> \u03c4\u03bf \u03c4\u03c1\u03ad\u03c7\u03bf\u03c5\u03bc\u03b5 \u03b5\u03bc\u03b5\u03af\u03c2 \u03c4\u03b1\u03ba\u03c4\u03b9\u03ba\u03ac \u03ae \u03bc\u03b5\u03c4\u03ac \u03b1\u03c0\u03cc \u03bc\u03b1\u03b6\u03b9\u03ba\u03ac <code>DELETE<\/code>\/<code>UPDATE<\/code>. \u0395\u03bb\u03b5\u03c5\u03b8\u03b5\u03c1\u03ce\u03bd\u03b5\u03b9 \u03c4\u03bf\u03bd \u03c7\u03ce\u03c1\u03bf \u03c4\u03c9\u03bd dead tuples \u03b5\u03bd\u03c4\u03cc\u03c2 \u03c4\u03c9\u03bd data pages \u03c4\u03bf\u03c5 \u03c0\u03af\u03bd\u03b1\u03ba\u03b1 \u03ce\u03c3\u03c4\u03b5 \u03bd\u03b1 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b7\u03b8\u03b5\u03af \u03b1\u03c0\u03cc \u03bc\u03b5\u03bb\u03bb\u03bf\u03bd\u03c4\u03b9\u03ba\u03ac <code>INSERT<\/code>\/<code>UPDATE<\/code> \u03ba\u03b1\u03b9 \u03c0\u03b1\u03c1\u03ac\u03bb\u03bb\u03b7\u03bb\u03b1 \u03b5\u03bd\u03b7\u03bc\u03b5\u03c1\u03ce\u03bd\u03b5\u03b9 \u03c4\u03b1 \u03c3\u03c4\u03b1\u03c4\u03b9\u03c3\u03c4\u03b9\u03ba\u03ac \u03c4\u03bf\u03c5 query planner. \u0391\u03be\u03af\u03b6\u03b5\u03b9 \u03bd\u03b1 \u03c3\u03b7\u03bc\u03b5\u03b9\u03c9\u03b8\u03b5\u03af \u03cc\u03c4\u03b9 \u03c4\u03bf \u03b1\u03c0\u03bb\u03cc Vacuum \u03b4\u03b5\u03bd \u03b5\u03c0\u03b9\u03c3\u03c4\u03c1\u03ad\u03c6\u03b5\u03b9 \u03c4\u03bf\u03bd \u03c7\u03ce\u03c1\u03bf \u03c3\u03c4\u03bf \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b9\u03ba\u03cc \u03c3\u03cd\u03c3\u03c4\u03b7\u03bc\u03b1 \u03b3\u03b9\u03b1 \u03b1\u03c5\u03c4\u03cc \u03b1\u03c0\u03b1\u03b9\u03c4\u03b5\u03af\u03c4\u03b1\u03b9 <code>VACUUM FULL<\/code>, \u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03cc\u03bc\u03c9\u03c2 \u03c0\u03b1\u03af\u03c1\u03bd\u03b5\u03b9 \u03b1\u03c0\u03bf\u03ba\u03bb\u03b5\u03b9\u03c3\u03c4\u03b9\u03ba\u03cc lock \u03c3\u03c4\u03bf\u03bd \u03c0\u03af\u03bd\u03b1\u03ba\u03b1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0393\u03b9\u03b1 \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1, \u03b3\u03b9\u03b1 \u03c7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03bf \u03ba\u03b1\u03b8\u03b1\u03c1\u03b9\u03c3\u03bc\u03cc \u03c4\u03c1\u03ad\u03c7\u03bf\u03c5\u03bc\u03b5:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">VACUUM ANALYZE public.my_table;<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tuning \u03ba\u03b1\u03b9 Best Practices \u03b3\u03b9\u03b1 \u03c4\u03bf Autovacuum<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a4\u03b1 default settings \u03c4\u03bf\u03c5 Autovacuum \u03c3\u03c4\u03b7\u03bd PostgreSQL \u03b5\u03af\u03bd\u03b1\u03b9 \u03c3\u03c7\u03b5\u03b4\u03b9\u03b1\u03c3\u03bc\u03ad\u03bd\u03b1 \u03b3\u03b9\u03b1 \u03bc\u03b9\u03ba\u03c1\u03ac \u03c0\u03b5\u03c1\u03b9\u03b2\u03ac\u03bb\u03bb\u03bf\u03bd\u03c4\u03b1. \u03a3\u03b5 \u03c0\u03b1\u03c1\u03b1\u03b3\u03c9\u03b3\u03b9\u03ba\u03ad\u03c2 \u03b2\u03ac\u03c3\u03b5\u03b9\u03c2 \u03bc\u03b5 \u03c5\u03c8\u03b7\u03bb\u03cc workload, \u03b1\u03c0\u03b1\u03b9\u03c4\u03b5\u03af\u03c4\u03b1\u03b9 tuning \u03b5\u03af\u03c4\u03b5 \u03c3\u03b5 \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf \u03b2\u03ac\u03c3\u03b7\u03c2 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd (<code>postgresql.conf<\/code>) \u03b5\u03af\u03c4\u03b5 \u03c3\u03b5 \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf \u03c0\u03af\u03bd\u03b1\u03ba\u03b1:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0397 \u03c0\u03b9\u03bf \u03c3\u03b7\u03bc\u03b1\u03bd\u03c4\u03b9\u03ba\u03ae \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03c2 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf <strong>autovacuum_vacuum_scale_factor <\/strong>(default: 0.20). \u039f\u03c1\u03af\u03b6\u03b5\u03b9 \u03cc\u03c4\u03b9 \u03c0\u03c1\u03ad\u03c0\u03b5\u03b9 \u03bd\u03b1 \u03b1\u03bb\u03bb\u03ac\u03be\u03b5\u03b9 \u03c4\u03bf 20% \u03c4\u03c9\u03bd \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ce\u03bd \u03b5\u03bd\u03cc\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b1 \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03b7\u03b8\u03b5\u03af \u03c4\u03bf autovacuum. \u03a3\u03b5 \u03bc\u03b5\u03b3\u03ac\u03bb\u03bf\u03c5\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b5\u03c2, \u03c4\u03bf 20% \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03b5\u03c1\u03ac\u03c3\u03c4\u03b9\u03bf \u03bd\u03bf\u03cd\u03bc\u03b5\u03c1\u03bf. \u0393\u03b9&#8217; \u03b1\u03c5\u03c4\u03cc, \u03b7 \u03b5\u03bd\u03b4\u03b5\u03b4\u03b5\u03b9\u03b3\u03bc\u03ad\u03bd\u03b7 \u03c4\u03b1\u03ba\u03c4\u03b9\u03ba\u03ae \u03b5\u03af\u03bd\u03b1\u03b9 \u03bd\u03b1 \u03c4\u03bf \u03ba\u03b1\u03c4\u03b5\u03b2\u03ac\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c3\u03c4\u03bf 0.05 (5%) \u03ba\u03b1\u03b8\u03bf\u03bb\u03b9\u03ba\u03ac \u03c3\u03c4\u03b7 \u03b2\u03ac\u03c3\u03b7 \u03ae \u03c4\u03bf\u03c0\u03b9\u03ba\u03ac \u03c3\u03c4\u03bf\u03c5\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b5\u03c2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a0\u03b1\u03c1\u03ac\u03bb\u03bb\u03b7\u03bb\u03b1, \u03b7 \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03c2 <strong>autovacuum_max_workers <\/strong>(default: 3) \u03ba\u03b1\u03b8\u03bf\u03c1\u03af\u03b6\u03b5\u03b9 \u03c0\u03cc\u03c3\u03b1 \u03c0\u03b1\u03c1\u03ac\u03bb\u03bb\u03b7\u03bb\u03b1 processes \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bd \u03bd\u03b1 \u03ba\u03ac\u03bd\u03bf\u03c5\u03bd vacuum \u03c4\u03b1\u03c5\u03c4\u03cc\u03c7\u03c1\u03bf\u03bd\u03b1 \u03c3\u03b5 \u03b4\u03b9\u03b1\u03c6\u03bf\u03c1\u03b5\u03c4\u03b9\u03ba\u03bf\u03cd\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b5\u03c2. \u03a3\u03b5 servers \u03bc\u03b5 \u03c0\u03bf\u03bb\u03bb\u03ac CPU cores, \u03ba\u03b1\u03bb\u03cc \u03b5\u03af\u03bd\u03b1\u03b9 \u03bd\u03b1 \u03c4\u03bf \u03b1\u03c5\u03be\u03ac\u03bd\u03bf\u03c5\u03bc\u03b5 \u03c3\u03b5 6 \u03ae 8.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a4\u03ad\u03bb\u03bf\u03c2, \u03c4\u03bf <strong>autovacuum_vacuum_cost_limit <\/strong>(default: 200) \u03c0\u03b5\u03c1\u03b9\u03bf\u03c1\u03af\u03b6\u03b5\u03b9 \u03c4\u03bf I\/O \u03c0\u03bf\u03c5 \u03ba\u03b1\u03c4\u03b1\u03bd\u03b1\u03bb\u03ce\u03bd\u03b5\u03b9 \u03c4\u03bf autovacuum \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03bc\u03b7\u03bd \u03b5\u03c0\u03b7\u03c1\u03b5\u03ac\u03b6\u03b5\u03b9 \u03c4\u03b7\u03bd \u03b5\u03c6\u03b1\u03c1\u03bc\u03bf\u03b3\u03ae. \u03a3\u03b5 \u03b3\u03c1\u03ae\u03b3\u03bf\u03c1\u03bf\u03c5\u03c2 \u03b4\u03af\u03c3\u03ba\u03bf\u03c5\u03c2, \u03b7 \u03c4\u03b9\u03bc\u03ae 200 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c0\u03bf\u03bb\u03cd \u03c3\u03c5\u03bd\u03c4\u03b7\u03c1\u03b7\u03c4\u03b9\u03ba\u03ae \u03ba\u03b1\u03b9 \u03ba\u03b1\u03b8\u03c5\u03c3\u03c4\u03b5\u03c1\u03b5\u03af \u03c4\u03bf\u03c5\u03c2 \u03ba\u03b1\u03b8\u03b1\u03c1\u03b9\u03c3\u03bc\u03bf\u03cd\u03c2. \u039c\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c4\u03bf \u03b1\u03c5\u03be\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c3\u03b5 1000 \u03ae 2000 \u03ce\u03c3\u03c4\u03b5 \u03bf\u03b9 \u03ba\u03b1\u03b8\u03b1\u03c1\u03b9\u03c3\u03bc\u03bf\u03af \u03bd\u03b1 \u03bf\u03bb\u03bf\u03ba\u03bb\u03b7\u03c1\u03ce\u03bd\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c0\u03bf\u03bb\u03cd \u03b3\u03c1\u03ae\u03b3\u03bf\u03c1\u03b1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0393\u03b9\u03b1 \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1 \u03b1\u03bd \u03b8\u03ad\u03bb\u03bf\u03c5\u03bc\u03b5 \u03bd\u03b1 \u03b1\u03bb\u03bb\u03ac\u03be\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf scale factor \u03ba\u03b1\u03b8\u03bf\u03bb\u03b9\u03ba\u03ac \u03c3\u03b5 \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf \u03b2\u03ac\u03c3\u03b7\u03c2 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03b1\u03bb\u03bb\u03ac\u03b6\u03bf\u03c5\u03bc\u03b5 \u03c3\u03c4\u03bf <code>postgresql.conf<\/code> \u03c4\u03b7\u03bd \u03c0\u03b1\u03c1\u03b1\u03ba\u03ac\u03c4\u03c9 \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf:<\/p>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>autovacuum_vacuum_scale_factor = 0.05<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03bd \u03cc\u03bc\u03c9\u03c2 \u03b8\u03ad\u03bb\u03bf\u03c5\u03bc\u03b5 \u03bd\u03b1 \u03c4\u03bf \u03b1\u03bb\u03bb\u03ac\u03be\u03bf\u03c5\u03bc\u03b5 \u03bc\u03cc\u03bd\u03bf \u03c3\u03b5 \u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03bf \u03c0\u03af\u03bd\u03b1\u03ba\u03b1 \u03c4\u03c1\u03ad\u03c7\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf \u03b5\u03be\u03ae\u03c2:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">ALTER TABLE public.table\nSET (autovacuum_vacuum_scale_factor = 0.05);<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sources:<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.postgresql.org\/docs\/current\/\" data-type=\"link\" data-id=\"https:\/\/www.postgresql.org\/docs\/current\/\">PostgreSQL 18.4 Documentation<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>\u03a3\u03b5 \u03b1\u03c5\u03c4\u03cc \u03c4\u03bf \u03ac\u03c1\u03b8\u03c1\u03bf \u03b8\u03b1 \u03b4\u03bf\u03cd\u03bc\u03b5 \u03c0\u03ce\u03c2 \u03b7 PostgreSQL \u03b4\u03b9\u03b1\u03c7\u03b5\u03b9\u03c1\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03c4\u03b7 \u03c4\u03b1\u03c5\u03c4\u03cc\u03c7\u03c1\u03bf\u03bd\u03b7 \u03c0\u03c1\u03cc\u03c3\u03b2\u03b1\u03c3\u03b7 \u03bc\u03ad\u03c3\u03c9 \u03c4\u03bf\u03c5 MVCC, \u03c4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf Bloat, \u03c4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf Data Churn, \u03c4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf Vacuum \u03ba\u03b1\u03b9 \u03c0\u03ce\u03c2 \u03c4\u03bf \u03c1\u03c5\u03b8\u03bc\u03af\u03b6\u03bf\u03c5\u03bc\u03b5 \u03c3\u03c9\u03c3\u03c4\u03ac \u03bc\u03b5 \u03c4\u03bf Autovacuum. \u03a4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf MVCC (Multi-Version Concurrency Control) \u03a4\u03bf MVCC \u03b5\u03af\u03bd\u03b1\u03b9 \u03bf \u03bc\u03b7\u03c7\u03b1\u03bd\u03b9\u03c3\u03bc\u03cc\u03c2 \u03c0\u03bf\u03c5 \u03b5\u03c0\u03b9\u03c4\u03c1\u03ad\u03c0\u03b5\u03b9 \u03c3\u03b5 \u03bc\u03b9\u03b1 \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd [&hellip;]<\/p>","protected":false},"author":1,"featured_media":2376,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,123],"tags":[29,48,124,30],"class_list":["post-6033","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-databases","category-postgresql","tag-databases","tag-performance_tuning","tag-postgresql","tag-rdbms"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u03a4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf MVCC \u03ba\u03b1\u03b9 \u03c4\u03bf Vacuum \u03c3\u03c4\u03b7 \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03c4\u03b7\u03c2 PostgreSQL \u03ba\u03b1\u03b9 \u03c0\u03ce\u03c2 \u03b1\u03c0\u03bf\u03c6\u03b5\u03cd\u03b3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf Bloat - DataPlatform.gr<\/title>\n<meta name=\"robots\" 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