{"id":6042,"date":"2026-08-11T07:00:00","date_gmt":"2026-08-11T04:00:00","guid":{"rendered":"https:\/\/www.dataplatform.gr\/?p=6042"},"modified":"2026-08-11T12:05:01","modified_gmt":"2026-08-11T09:05:01","slug":"pos-leitoyrgei-mnimi-sti-postgresql-poies","status":"publish","type":"post","link":"https:\/\/www.dataplatform.gr\/en\/%cf%80%cf%8e%cf%82-%ce%bb%ce%b5%ce%b9%cf%84%ce1tp-3tbf%cf%85%cf%81%ce%b3%ce%b5%ce%af-%ce%b7-%ce%bc-ce%bd%ce%ae%ce%bc%ce%b7-%cf%83%cf%84%ce%b7-postgresql-1tp-3tce%ba%ce%b1%ce%b9-%cf%80%ce%bf%ce%b9%ceb\/","title":{"rendered":"How memory works in PostgreSQL and what parameters do we configure?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">\u03a3\u03b5 \u03c0\u03c1\u03bf\u03b7\u03b3\u03bf\u03cd\u03bc\u03b5\u03bd\u03bf \u03ac\u03c1\u03b8\u03c1\u03bf \u03ad\u03c7\u03bf\u03c5\u03bc\u03b5 \u03b1\u03bd\u03b1\u03bb\u03cd\u03c3\u03b5\u03b9 \u03c4\u03b7\u03bd \u03b1\u03c1\u03c7\u03b9\u03c4\u03b5\u03ba\u03c4\u03bf\u03bd\u03b9\u03ba\u03ae \u03c4\u03b7\u03c2 Oracle Database (SGA\/PGA). \u0391\u03c5\u03c4\u03ae \u03c4\u03b7\u03bd \u03c6\u03bf\u03c1\u03ac \u03b8\u03b1 \u03b4\u03bf\u03cd\u03bc\u03b5 \u03c4\u03b7\u03bd <strong>\u03b1\u03c1\u03c7\u03b9\u03c4\u03b5\u03ba\u03c4\u03bf\u03bd\u03b9\u03ba\u03ae \u03bc\u03bd\u03ae\u03bc\u03b7\u03c2 \u03c4\u03b7\u03c2 PostgreSQL<\/strong> \u03ba\u03b1\u03b9 \u03c4\u03b9\u03c2 \u03b2\u03b1\u03c3\u03b9\u03ba\u03ad\u03c2 \u03c0\u03b1\u03c1\u03b1\u03bc\u03ad\u03c4\u03c1\u03bf\u03c5\u03c2 \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03b2\u03ad\u03bb\u03c4\u03b9\u03c3\u03c4\u03b7 \u03b1\u03c0\u03cc\u03b4\u03bf\u03c3\u03b7.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a4\u03bf \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03bf \u03bc\u03bd\u03ae\u03bc\u03b7 \u03c4\u03b7\u03c2 PostgreSQL \u03b4\u03b9\u03b1\u03c6\u03ad\u03c1\u03b5\u03b9 \u03c3\u03b7\u03bc\u03b1\u03bd\u03c4\u03b9\u03ba\u03ac \u03b1\u03c0\u03cc \u03b1\u03c5\u03c4\u03cc \u03c4\u03bf\u03c5 SQL Server \u03ae \u03c4\u03b7\u03c2 Oracle Database. \u0398\u03b1 \u03c0\u03c1\u03ad\u03c0\u03b5\u03b9 \u03bf\u03c0\u03c9\u03c3\u03b4\u03ae\u03c0\u03bf\u03c4\u03b5 \u03bd\u03b1 \u03b3\u03bd\u03c9\u03c1\u03af\u03b6\u03bf\u03c5\u03bc\u03b5 \u03c0\u03c9\u03c2 \u03ba\u03b1\u03c4\u03b1\u03bd\u03ad\u03bc\u03b5\u03c4\u03b1\u03b9 \u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7 \u03ce\u03c3\u03c4\u03b5 \u03bd\u03b1 \u03b1\u03c0\u03bf\u03c6\u03cd\u03b3\u03bf\u03c5\u03bc\u03b5 \u03c3\u03c6\u03ac\u03bb\u03bc\u03b1\u03c4\u03b1 \u03cc\u03c0\u03c9\u03c2 \u03c4\u03bf Out of Memory (OOM) \u03c3\u03c4\u03bf \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b9\u03ba\u03cc \u03c3\u03cd\u03c3\u03c4\u03b7\u03bc\u03b1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0397 \u0391\u03c1\u03c7\u03b9\u03c4\u03b5\u03ba\u03c4\u03bf\u03bd\u03b9\u03ba\u03ae \u039c\u03bd\u03ae\u03bc\u03b7\u03c2 \u03c3\u03c4\u03b7\u03bd PostgreSQL<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0397 \u03c3\u03c5\u03bd\u03bf\u03bb\u03b9\u03ba\u03ae \u03bc\u03bd\u03ae\u03bc\u03b7 RAM \u03c0\u03bf\u03c5 \u03b4\u03b5\u03c3\u03bc\u03b5\u03cd\u03b5\u03b9 \u03b7 PostgreSQL \u03c7\u03c9\u03c1\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03c3\u03b5 \u03b4\u03cd\u03bf \u03bc\u03b5\u03b3\u03ac\u03bb\u03b5\u03c2 \u03ba\u03b1\u03c4\u03b7\u03b3\u03bf\u03c1\u03af\u03b5\u03c2:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Shared Memory Areas:<\/strong> \u03a0\u03b5\u03c1\u03b9\u03bf\u03c7\u03ad\u03c2 \u03bc\u03bd\u03ae\u03bc\u03b7\u03c2 \u03c0\u03bf\u03c5 \u03bc\u03bf\u03b9\u03c1\u03ac\u03b6\u03bf\u03bd\u03c4\u03b1\u03b9 \u03cc\u03bb\u03b5\u03c2 \u03bf\u03b9 \u03b4\u03b9\u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b5\u03c2 (processes\/sessions) \u03c4\u03b7\u03c2 \u03b2\u03ac\u03c3\u03b7\u03c2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Local Memory Areas:<\/strong> \u03a0\u03b5\u03c1\u03b9\u03bf\u03c7\u03ad\u03c2 \u03bc\u03bd\u03ae\u03bc\u03b7\u03c2 \u03c0\u03bf\u03c5 \u03b4\u03b5\u03c3\u03bc\u03b5\u03cd\u03bf\u03bd\u03c4\u03b1\u03b9 \u03be\u03b5\u03c7\u03c9\u03c1\u03b9\u03c3\u03c4\u03ac \u03b1\u03c0\u03cc \u03ba\u03ac\u03b8\u03b5 process \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03b5\u03ba\u03c4\u03ad\u03bb\u03b5\u03c3\u03b7 \u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03c9\u03bd queries.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"630\" height=\"443\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/07\/pgmem-01.png\" alt=\"\" class=\"wp-image-6043\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/07\/pgmem-01.png 630w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/07\/pgmem-01-300x211.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/07\/pgmem-01-18x12.png 18w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/07\/pgmem-01-340x240.png 340w\" sizes=\"auto, (max-width: 630px) 100vw, 630px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Shared Memory Parameters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a3\u03c4\u03b7\u03bd \u03ba\u03bf\u03b9\u03bd\u03cc\u03c7\u03c1\u03b7\u03c3\u03c4\u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7, \u03b7 \u03c0\u03b9\u03bf \u03ba\u03bf\u03bc\u03b2\u03b9\u03ba\u03ae \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03c2 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf <strong>shared_buffers<\/strong>, \u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03b1\u03c0\u03bf\u03c4\u03b5\u03bb\u03b5\u03af \u03c4\u03b7\u03bd \u03ba\u03cd\u03c1\u03b9\u03b1 \u03c0\u03b5\u03c1\u03b9\u03bf\u03c7\u03ae cache \u03b3\u03b9\u03b1 \u03c4\u03b1 data pages \u03ba\u03b1\u03b9 \u03c4\u03b1 indexes (\u03b1\u03bd\u03c4\u03af\u03c3\u03c4\u03bf\u03b9\u03c7\u03bf \u03bc\u03b5 \u03c4\u03bf Buffer Pool \u03c4\u03bf\u03c5 SQL Server \u03ae \u03c4\u03bf Buffer Cache \u03c3\u03c4\u03bf SGA \u03c4\u03b7\u03c2 Oracle). \u0397 \u03c0\u03c1\u03bf\u03b5\u03c0\u03b9\u03bb\u03b5\u03b3\u03bc\u03ad\u03bd\u03b7 \u03c4\u03b9\u03bc\u03ae \u03c4\u03bf\u03c5 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c3\u03c5\u03bd\u03ae\u03b8\u03c9\u03c2 128MB. \u03a3\u03c4\u03bf\u03bd SQL Server \u03b5\u03af\u03bc\u03b1\u03c3\u03c4\u03b5 \u03c3\u03c5\u03bd\u03b7\u03b8\u03b9\u03c3\u03bc\u03ad\u03bd\u03bf\u03b9 \u03bd\u03b1 \u03b4\u03af\u03bd\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf 80% \u03c4\u03b7\u03c2 RAM \u03c3\u03c4\u03b7 \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd, \u03cc\u03bc\u03c9\u03c2 \u03c3\u03c4\u03b7\u03bd PostgreSQL \u03b1\u03c5\u03c4\u03cc \u03b5\u03af\u03bd\u03b1\u03b9 \u03bb\u03ac\u03b8\u03bf\u03c2, \u03ba\u03b1\u03b8\u03ce\u03c2 \u03b7 \u03b1\u03c1\u03c7\u03b9\u03c4\u03b5\u03ba\u03c4\u03bf\u03bd\u03b9\u03ba\u03ae \u03c4\u03b7\u03c2 \u03b2\u03b1\u03c3\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03c3\u03b7\u03bc\u03b1\u03bd\u03c4\u03b9\u03ba\u03ac \u03c3\u03c4\u03bf Page Cache \u03c4\u03bf\u03c5 \u03af\u03b4\u03b9\u03bf\u03c5 \u03c4\u03bf\u03c5 \u039b\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b9\u03ba\u03bf\u03cd \u03a3\u03c5\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03bf\u03c2. \u0393\u03b9&#8217; \u03b1\u03c5\u03c4\u03cc\u03bd \u03c4\u03bf\u03bd \u03bb\u03cc\u03b3\u03bf, \u03b7 \u03b5\u03bd\u03b4\u03b5\u03b4\u03b5\u03b9\u03b3\u03bc\u03ad\u03bd\u03b7 \u03c4\u03b9\u03bc\u03ae \u03b3\u03b9\u03b1 \u03c4\u03bf <code>shared_buffers<\/code> is <strong>\u03c4\u03bf 25% \u03c4\u03b7\u03c2 \u03c3\u03c5\u03bd\u03bf\u03bb\u03b9\u03ba\u03ae\u03c2 RAM \u03c4\u03bf\u03c5 server<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0388\u03bd\u03b1 \u03ac\u03bb\u03bb\u03bf \u03c3\u03b7\u03bc\u03b1\u03bd\u03c4\u03b9\u03ba\u03cc \u03c4\u03bc\u03ae\u03bc\u03b1 \u03c4\u03b7\u03c2 Shared Memory \u03b5\u03af\u03bd\u03b1\u03b9 \u03bf <strong>Lock Manager<\/strong>, \u03b7 \u03b5\u03b9\u03b4\u03b9\u03ba\u03ae \u03c0\u03b5\u03c1\u03b9\u03bf\u03c7\u03ae \u03cc\u03c0\u03bf\u03c5 \u03b1\u03c0\u03bf\u03b8\u03b7\u03ba\u03b5\u03cd\u03bf\u03bd\u03c4\u03b1\u03b9 \u03cc\u03bb\u03b1 \u03c4\u03b1 \u03ba\u03bb\u03b5\u03b9\u03b4\u03ce\u03bc\u03b1\u03c4\u03b1 (row-level, table-level, advisory locks, lightweight locks) \u03c0\u03bf\u03c5 \u03ba\u03c1\u03b1\u03c4\u03bf\u03cd\u03bd \u03ae \u03c0\u03b5\u03c1\u03b9\u03bc\u03ad\u03bd\u03bf\u03c5\u03bd \u03c4\u03b1 \u03b5\u03bd\u03b5\u03c1\u03b3\u03ac transactions. \u03a4\u03bf \u03bc\u03ad\u03b3\u03b5\u03b8\u03bf\u03c2 \u03c4\u03b7\u03c2 \u03bc\u03bd\u03ae\u03bc\u03b7\u03c2 \u03c0\u03bf\u03c5 \u03b4\u03b5\u03c3\u03bc\u03b5\u03cd\u03b5\u03b9 \u03bf Lock Manager \u03c5\u03c0\u03bf\u03bb\u03bf\u03b3\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03b4\u03c5\u03bd\u03b1\u03bc\u03b9\u03ba\u03ac \u03bc\u03b5 \u03b2\u03ac\u03c3\u03b7 \u03c4\u03b9\u03c2 \u03c0\u03b1\u03c1\u03b1\u03bc\u03ad\u03c4\u03c1\u03bf\u03c5\u03c2 <code>max_locks_per_transaction<\/code> (default 64) \u03ba\u03b1\u03b9 <code>max_connections<\/code>. \u0391\u03bd \u03ad\u03bd\u03b1 query \u03c0\u03c1\u03bf\u03c3\u03c0\u03b1\u03b8\u03ae\u03c3\u03b5\u03b9 \u03bd\u03b1 \u03b1\u03c0\u03bf\u03ba\u03c4\u03ae\u03c3\u03b5\u03b9 \u03ba\u03bb\u03b5\u03b9\u03b4\u03ce\u03bc\u03b1\u03c4\u03b1 \u03c3\u03b5 \u03c0\u03ac\u03c1\u03b1 \u03c0\u03bf\u03bb\u03bb\u03bf\u03cd\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b5\u03c2 \u03c4\u03b1\u03c5\u03c4\u03cc\u03c7\u03c1\u03bf\u03bd\u03b1 \u03ba\u03b1\u03b9 \u03b5\u03bc\u03c6\u03b1\u03bd\u03b9\u03c3\u03c4\u03b5\u03af \u03c4\u03bf \u03c3\u03c6\u03ac\u03bb\u03bc\u03b1 <em>out of shared memory<\/em>, \u03b7 \u03bb\u03cd\u03c3\u03b7 \u03b5\u03af\u03bd\u03b1\u03b9 \u03bd\u03b1 \u03b1\u03c5\u03be\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b7\u03bd \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf <code>max_locks_per_transaction<\/code> in <strong>128<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a4\u03ad\u03bb\u03bf\u03c2, \u03c3\u03c4\u03b7\u03bd \u03ba\u03bf\u03b9\u03bd\u03cc\u03c7\u03c1\u03b7\u03c3\u03c4\u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7 \u03b1\u03bd\u03ae\u03ba\u03bf\u03c5\u03bd \u03ba\u03b1\u03b9 \u03c4\u03b1 <strong>wal_buffers<\/strong>, \u03c3\u03c4\u03b1 \u03bf\u03c0\u03bf\u03af\u03b1 \u03b1\u03c0\u03bf\u03b8\u03b7\u03ba\u03b5\u03cd\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c0\u03c1\u03bf\u03c3\u03c9\u03c1\u03b9\u03bd\u03ac \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03c4\u03bf\u03c5 Write-Ahead Logging (WAL) \u03c0\u03c1\u03b9\u03bd \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03bf\u03cd\u03bd \u03c3\u03c4\u03bf \u03b4\u03af\u03c3\u03ba\u03bf, \u03cc\u03c0\u03c9\u03c2 \u03ba\u03ac\u03bd\u03b5\u03b9 \u03c4\u03bf Log Buffer \u03c3\u03b5 \u03ac\u03bb\u03bb\u03b1 RDBMS. \u0397 \u03c4\u03b9\u03bc\u03ae \u03c4\u03bf\u03c5\u03c2 \u03c1\u03c5\u03b8\u03bc\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1 \u03c3\u03c4\u03bf 3% \u03c4\u03bf\u03c5 <code>shared_buffers<\/code> (\u03bc\u03b5 \u03b1\u03bd\u03ce\u03c4\u03b1\u03c4\u03bf \u03cc\u03c1\u03b9\u03bf \u03c4\u03b1 16MB) \u03ba\u03b1\u03b9 \u03c3\u03c5\u03bd\u03ae\u03b8\u03c9\u03c2 \u03b4\u03b5\u03bd \u03c7\u03c1\u03b5\u03b9\u03ac\u03b6\u03b5\u03c4\u03b1\u03b9 \u03bd\u03b1 \u03c0\u03b1\u03c1\u03ad\u03bc\u03b2\u03bf\u03c5\u03bc\u03b5 \u03c7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03b1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03c5\u03c4\u03ad\u03c2 \u03c4\u03b9\u03c2 \u03c0\u03b1\u03c1\u03b1\u03bc\u03ad\u03c4\u03c1\u03bf\u03c5\u03c2 \u03b1\u03bd \u03c4\u03b9\u03c2 \u03b1\u03bb\u03bb\u03ac\u03be\u03bf\u03c5\u03bc\u03b5 \u03c3\u03c4\u03bf <code>postgresql.conf<\/code> <strong>\u03b1\u03c0\u03b1\u03b9\u03c4\u03bf\u03cd\u03bd \u03bd\u03b1 \u03b3\u03af\u03bd\u03b5\u03b9 restart \u03c4\u03bf service<\/strong>, \u03b4\u03b5\u03bd \u03b5\u03b9\u03bd\u03b1\u03b9 \u03b4\u03c5\u03bd\u03b1\u03bc\u03b9\u03ba\u03ad\u03c2 \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03b9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Local Process Memory Parameters (\u0391\u03bd\u03ac Session\/Query)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0395\u03b4\u03ce \u03ba\u03c1\u03cd\u03b2\u03b5\u03c4\u03b1\u03b9 \u03b7 \u03bc\u03b5\u03b3\u03b1\u03bb\u03cd\u03c4\u03b5\u03c1\u03b7 \u03c0\u03b1\u03b3\u03af\u03b4\u03b1 \u03b3\u03b9\u03b1 out of memory crashes, \u03ba\u03b1\u03b8\u03ce\u03c2 \u03bf\u03b9 \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03b9 \u03b1\u03c5\u03c4\u03bf\u03af \u03b4\u03b5\u03bd \u03b1\u03c6\u03bf\u03c1\u03bf\u03cd\u03bd \u03c4\u03b7 \u03c3\u03c5\u03bd\u03bf\u03bb\u03b9\u03ba\u03ae \u03bc\u03bd\u03ae\u03bc\u03b7 \u03c4\u03bf\u03c5 session, \u03b1\u03bb\u03bb\u03ac <strong>\u03ba\u03ac\u03b8\u03b5 \u03bc\u03b5\u03bc\u03bf\u03bd\u03c9\u03bc\u03ad\u03bd\u03bf operation<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>work_mem <\/strong>\u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af\u03c4\u03b1\u03b9 \u03b3\u03b9\u03b1 \u03b5\u03c3\u03c9\u03c4\u03b5\u03c1\u03b9\u03ba\u03ad\u03c2 \u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b5\u03c2 \u03c4\u03b1\u03be\u03b9\u03bd\u03cc\u03bc\u03b7\u03c3\u03b7\u03c2 (\u03cc\u03c0\u03c9\u03c2 <code>ORDER BY<\/code> and <code>DISTINCT<\/code>) \u03ba\u03b1\u03b8\u03ce\u03c2 \u03ba\u03b1\u03b9 \u03b3\u03b9\u03b1 joins. \u0397 \u03c0\u03c1\u03bf\u03b5\u03c0\u03b9\u03bb\u03b5\u03b3\u03bc\u03ad\u03bd\u03b7 \u03c4\u03b9\u03bc\u03ae \u03c4\u03bf\u03c5 \u03b5\u03af\u03bd\u03b1\u03b9 \u03bc\u03cc\u03bb\u03b9\u03c2 4MB. \u0394\u03b5\u03bd \u03bf\u03c1\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03bc\u03af\u03b1 \u03c6\u03bf\u03c1\u03ac \u03b1\u03bd\u03ac \u03c3\u03cd\u03bd\u03b4\u03b5\u03c3\u03b7, \u03b1\u03bb\u03bb\u03ac \u03b1\u03bd\u03ac operation \u03bc\u03ad\u03c3\u03b1 \u03c3\u03c4\u03bf \u03c0\u03bb\u03ac\u03bd\u03bf \u03b5\u03ba\u03c4\u03ad\u03bb\u03b5\u03c3\u03b7\u03c2. \u0391\u03c5\u03c4\u03cc \u03c3\u03b7\u03bc\u03b1\u03af\u03bd\u03b5\u03b9 \u03cc\u03c4\u03b9 \u03b1\u03bd \u03ad\u03bd\u03b1 \u03c3\u03cd\u03bd\u03b8\u03b5\u03c4\u03bf query \u03b5\u03ba\u03c4\u03b5\u03bb\u03b5\u03af 3 Hash Joins \u03ba\u03b1\u03b9 2 Sorts, \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03ba\u03b1\u03c4\u03b1\u03bd\u03b1\u03bb\u03ce\u03c3\u03b5\u03b9 \u03ad\u03c9\u03c2 \u03ba\u03b1\u03b9 5 \u03c6\u03bf\u03c1\u03ad\u03c2 \u03c4\u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7 \u03b1\u03c5\u03c4\u03ae \u03ba\u03b1\u03c4\u03ac \u03c4\u03b7\u03bd \u03b5\u03ba\u03c4\u03ad\u03bb\u03b5\u03c3\u03ae \u03c4\u03bf\u03c5. \u0393\u03b9\u03b1 \u03c4\u03b7\u03bd \u03b1\u03c0\u03bf\u03c6\u03c5\u03b3\u03ae OOM, \u03b4\u03b9\u03b1\u03c4\u03b7\u03c1\u03bf\u03cd\u03bc\u03b5 \u03c4\u03bf <code>work_mem<\/code> \u03c7\u03b1\u03bc\u03b7\u03bb\u03ac \u03c3\u03b5 \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf \u03b2\u03ac\u03c3\u03b7\u03c2 \u03c0.\u03c7. <strong>32MB<\/strong>. \u0391\u03bd \u03ad\u03bd\u03b1 \u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03bf \u03b2\u03b1\u03c1\u03cd report \u03c7\u03c1\u03b5\u03b9\u03ac\u03b6\u03b5\u03c4\u03b1\u03b9 \u03c0\u03b5\u03c1\u03b9\u03c3\u03c3\u03cc\u03c4\u03b5\u03c1\u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7, \u03c4\u03bf \u03b1\u03bb\u03bb\u03ac\u03b6\u03bf\u03c5\u03bc\u03b5 \u03c0\u03c1\u03bf\u03c3\u03c9\u03c1\u03b9\u03bd\u03ac \u03c3\u03c4\u03bf \u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03bf session \u03ba\u03b1\u03b9 \u03c3\u03c4\u03b7 \u03c3\u03c5\u03bd\u03ad\u03c7\u03b5\u03b9\u03b1 \u03c4\u03bf \u03b5\u03c0\u03b1\u03bd\u03b1\u03c6\u03ad\u03c1\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=\"\">SET work_mem = '256MB';\n\nRESET work_mem;<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a0\u03b1\u03c1\u03ac\u03bb\u03bb\u03b7\u03bb\u03b1, \u03b3\u03b9\u03b1 \u03c4\u03b1 sessions \u03c0\u03bf\u03c5 \u03ba\u03ac\u03bd\u03bf\u03c5\u03bd \u03c7\u03c1\u03ae\u03c3\u03b7 \u03c0\u03c1\u03bf\u03c3\u03c9\u03c1\u03b9\u03bd\u03ce\u03bd \u03c0\u03b9\u03bd\u03ac\u03ba\u03c9\u03bd (<code>TEMP TABLE<\/code>), \u03c5\u03c0\u03ac\u03c1\u03c7\u03b5\u03b9 \u03b7 \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03c2 <strong>temp_buffers<\/strong>. \u039a\u03b1\u03b8\u03bf\u03c1\u03af\u03b6\u03b5\u03b9 \u03c4\u03bf \u03b1\u03bd\u03ce\u03c4\u03b1\u03c4\u03bf \u03cc\u03c1\u03b9\u03bf \u03bc\u03bd\u03ae\u03bc\u03b7\u03c2 \u03c0\u03bf\u03c5 \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03b5\u03b9 \u03ba\u03ac\u03b8\u03b5 session \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03ba\u03c1\u03b1\u03c4\u03ac\u03b5\u03b9 \u03c3\u03c4\u03b7 RAM \u03c4\u03b1 data pages \u03c4\u03c9\u03bd temporary tables, \u03bc\u03b5 default \u03c4\u03b9\u03bc\u03ae \u03c4\u03b1 8MB. \u0391\u03bd \u03ad\u03bd\u03b1 query \u03c0\u03b1\u03c1\u03ac\u03b3\u03b5\u03b9 \u03bc\u03b5\u03b3\u03ac\u03bb\u03bf\u03c5\u03c2 \u03c0\u03c1\u03bf\u03c3\u03c9\u03c1\u03b9\u03bd\u03bf\u03cd\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b5\u03c2 \u03c0\u03bf\u03c5 \u03be\u03b5\u03c0\u03b5\u03c1\u03bd\u03bf\u03cd\u03bd \u03b1\u03c5\u03c4\u03cc \u03c4\u03bf \u03cc\u03c1\u03b9\u03bf, \u03b7 PostgreSQL \u03b8\u03b1 \u03b1\u03bd\u03b1\u03b3\u03ba\u03b1\u03c3\u03c4\u03b5\u03af \u03bd\u03b1 \u03b3\u03c1\u03ac\u03c8\u03b5\u03b9 \u03c4\u03b1 \u03b5\u03bd\u03b1\u03c0\u03bf\u03bc\u03b5\u03af\u03bd\u03b1\u03bd\u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03c3\u03c4\u03bf \u03b4\u03af\u03c3\u03ba\u03bf, \u03c0\u03c1\u03bf\u03ba\u03b1\u03bb\u03ce\u03bd\u03c4\u03b1\u03c2 I\/O overhead. \u03a3\u03b5 \u03c0\u03b5\u03c1\u03b9\u03b2\u03ac\u03bb\u03bb\u03bf\u03bd\u03c4\u03b1 \u03bc\u03b5 \u03b2\u03b1\u03c1\u03b9\u03ac ETL processes \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03b1\u03c5\u03be\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf <code>temp_buffers<\/code> \u03c0.\u03c7. \u03c3\u03c4\u03b1 <strong>32MB <\/strong>\u03b5\u03af\u03c4\u03b5 \u03ba\u03b1\u03b8\u03bf\u03bb\u03b9\u03ba\u03ac \u03b5\u03af\u03c4\u03b5 \u03c4\u03bf\u03c0\u03b9\u03ba\u03ac \u03c3\u03c4\u03bf session \u03c0\u03bf\u03c5 \u03b5\u03ba\u03c4\u03b5\u03bb\u03b5\u03af \u03c4\u03b7 \u03b4\u03b9\u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03c0\u03cc \u03c4\u03b7\u03bd \u03b1\u03bb\u03bb\u03b7, \u03c4\u03bf <strong>maintenance_work_mem <\/strong>\u03ba\u03b1\u03b8\u03bf\u03c1\u03af\u03b6\u03b5\u03b9 \u03c4\u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7 \u03c0\u03bf\u03c5 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af\u03c4\u03b1\u03b9 \u03b3\u03b9\u03b1 \u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b5\u03c2 \u03c3\u03c5\u03bd\u03c4\u03ae\u03c1\u03b7\u03c3\u03b7\u03c2, \u03cc\u03c0\u03c9\u03c2 \u03c4\u03bf <code>CREATE INDEX<\/code>, the <code>ALTER TABLE ADD FOREIGN KEY<\/code> and <code>VACUUM<\/code>. \u0397 \u03c0\u03c1\u03bf\u03b5\u03c0\u03b9\u03bb\u03b5\u03b3\u03bc\u03ad\u03bd\u03b7 \u03c4\u03b9\u03bc\u03ae \u03c4\u03bf\u03c5 \u03b5\u03af\u03bd\u03b1\u03b9 64MB, \u03b1\u03bb\u03bb\u03ac \u03b5\u03c0\u03b5\u03b9\u03b4\u03ae \u03bf\u03b9 \u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b5\u03c2 \u03c3\u03c5\u03bd\u03c4\u03ae\u03c1\u03b7\u03c3\u03b7\u03c2 \u03b5\u03ba\u03c4\u03b5\u03bb\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 \u03c3\u03c0\u03ac\u03bd\u03b9\u03b1 \u03ba\u03b1\u03b9 \u03b1\u03c0\u03cc \u03bc\u03b5\u03bc\u03bf\u03bd\u03c9\u03bc\u03ad\u03bd\u03b1 processes, \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03b4\u03ce\u03c3\u03bf\u03c5\u03bc\u03b5 \u03b1\u03c1\u03ba\u03b5\u03c4\u03ac \u03c5\u03c8\u03b7\u03bb\u03cc\u03c4\u03b5\u03c1\u03b7 \u03c4\u03b9\u03bc\u03ae \u03c0.\u03c7. <strong>2GB<\/strong>, \u03ce\u03c3\u03c4\u03b5 \u03c4\u03b1 index builds \u03ba\u03b1\u03b9 \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 \u03c4\u03b1\u03c7\u03cd\u03c4\u03b5\u03c1\u03b1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u039f\u03b9 Local Parameters \u03b5\u03b9\u03bd\u03b1\u03b9 \u03b4\u03c5\u03bd\u03b1\u03bc\u03b9\u03ba\u03ad\u03c2 \u03b4\u03b5\u03bd \u03c7\u03c1\u03b5\u03b9\u03ac\u03b6\u03b5\u03c4\u03b1\u03b9 \u03bd\u03b1 \u03c0\u03ad\u03c3\u03b5\u03b9 \u03c4\u03bf service \u03b1\u03bd \u03c4\u03b9\u03c2 \u03b1\u03bb\u03bb\u03ac\u03be\u03bf\u03c5\u03bc\u03b5 \u03c3\u03c4\u03bf <code>postgresql.conf<\/code> \u03c7\u03c1\u03b5\u03b9\u03ac\u03b6\u03b5\u03c4\u03b1\u03b9 \u03b1\u03c0\u03bb\u03ac reload \u03bc\u03ad\u03c3\u03c9 SQL (<code>SELECT pg_reload_conf();<\/code>)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u03a0\u03ce\u03c2 \u03b5\u03bb\u03ad\u03b3\u03c7\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b7 \u03c7\u03c1\u03ae\u03c3\u03b7 \u03c4\u03b7\u03c2 Shared Memory (Cache Hit Ratio)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0393\u03b9\u03b1 \u03bd\u03b1 \u03b4\u03b9\u03b1\u03c0\u03b9\u03c3\u03c4\u03ce\u03c3\u03bf\u03c5\u03bc\u03b5 \u03b1\u03bd \u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7 <code>shared_buffers<\/code> \u03b5\u03c0\u03b1\u03c1\u03ba\u03b5\u03af \u03ae \u03b1\u03bd \u03b7 \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b9\u03b1\u03b2\u03ac\u03b6\u03b5\u03b9 \u03c3\u03c5\u03bd\u03b5\u03c7\u03ce\u03c2 \u03b1\u03c0\u03cc \u03c4\u03bf \u03b4\u03af\u03c3\u03ba\u03bf, \u03c0\u03b1\u03c1\u03b1\u03ba\u03bf\u03bb\u03bf\u03c5\u03b8\u03bf\u03cd\u03bc\u03b5 \u03c4\u03bf <strong>Buffer Cache Hit Ratio<\/strong> \u03bc\u03b5 \u03c4\u03bf \u03c0\u03b1\u03c1\u03b1\u03ba\u03ac\u03c4\u03c9 query:<\/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    COALESCE(sum(heap_blks_read), 0) AS disk_reads,\n    COALESCE(sum(heap_blks_hit), 0)  AS buffer_hits,\n    CASE \n        WHEN (COALESCE(sum(heap_blks_hit), 0) + COALESCE(sum(heap_blks_read), 0)) > 0 \n        THEN ROUND(\n            100.0 * sum(heap_blks_hit) \/ (sum(heap_blks_hit) + sum(heap_blks_read)), \n            2\n        )\n        ELSE 0 \n    END AS cache_hit_ratio\nFROM pg_statio_user_tables;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"735\" height=\"379\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgmm-01.png\" alt=\"\" class=\"wp-image-6113\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgmm-01.png 735w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgmm-01-300x155.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgmm-01-18x9.png 18w\" sizes=\"auto, (max-width: 735px) 100vw, 735px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\u0395\u03c1\u03bc\u03b7\u03bd\u03b5\u03af\u03b1 \u03c4\u03bf\u03c5 \u03b1\u03c0\u03bf\u03c4\u03b5\u03bb\u03ad\u03c3\u03bc\u03b1\u03c4\u03bf\u03c2:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>cache_hit_ratio &gt; 99%<\/code>:<\/strong> \u0397 \u03b2\u03ac\u03c3\u03b7 \u03b5\u03be\u03c5\u03c0\u03b7\u03c1\u03b5\u03c4\u03b5\u03af \u03c4\u03b1 \u03b1\u03b9\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03c3\u03c7\u03b5\u03b4\u03cc\u03bd \u03b5\u03be \u03bf\u03bb\u03bf\u03ba\u03bb\u03ae\u03c1\u03bf\u03c5 \u03b1\u03c0\u03cc \u03c4\u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7 RAM.<\/li>\n\n\n\n<li><strong><code>cache_hit_ratio &lt; 95%<\/code>:<\/strong> \u0391\u03c5\u03be\u03b7\u03bc\u03ad\u03bd\u03bf I\/O \u03c3\u03c4\u03bf \u03b4\u03af\u03c3\u03ba\u03bf. \u0391\u03c0\u03b1\u03b9\u03c4\u03b5\u03af\u03c4\u03b1\u03b9 \u03ad\u03bb\u03b5\u03b3\u03c7\u03bf\u03c2 \u03b3\u03b9\u03b1 missing indexes \u03ae \u03c0\u03b9\u03b8\u03b1\u03bd\u03ae \u03b1\u03cd\u03be\u03b7\u03c3\u03b7 \u03c4\u03bf\u03c5 <code>shared_buffers<\/code>.<\/li>\n\n\n\n<li><strong><code>0% (\u03ae \u03bc\u03b7\u03b4\u03b5\u03bd\u03b9\u03ba\u03ac reads\/hits)<\/code>:<\/strong> \u0397 \u03b2\u03ac\u03c3\u03b7 \u03bc\u03cc\u03bb\u03b9\u03c2 \u03be\u03b5\u03ba\u03af\u03bd\u03b7\u03c3\u03b5 \u03ae \u03b4\u03b5\u03bd \u03ad\u03c7\u03bf\u03c5\u03bd \u03b5\u03ba\u03c4\u03b5\u03bb\u03b5\u03c3\u03c4\u03b5\u03af \u03b1\u03ba\u03cc\u03bc\u03b1 queries \u03c3\u03c4\u03bf\u03c5\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b5\u03c2 \u03c7\u03c1\u03b7\u03c3\u03c4\u03ce\u03bd.<\/li>\n<\/ul>\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<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.postgresql.org\/docs\/current\/\" data-type=\"link\" data-id=\"https:\/\/www.postgresql.org\/docs\/current\/\">PostgreSQL 18.4 Documentation<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>\u03a3\u03b5 \u03c0\u03c1\u03bf\u03b7\u03b3\u03bf\u03cd\u03bc\u03b5\u03bd\u03bf \u03ac\u03c1\u03b8\u03c1\u03bf \u03ad\u03c7\u03bf\u03c5\u03bc\u03b5 \u03b1\u03bd\u03b1\u03bb\u03cd\u03c3\u03b5\u03b9 \u03c4\u03b7\u03bd \u03b1\u03c1\u03c7\u03b9\u03c4\u03b5\u03ba\u03c4\u03bf\u03bd\u03b9\u03ba\u03ae \u03c4\u03b7\u03c2 Oracle Database (SGA\/PGA). \u0391\u03c5\u03c4\u03ae \u03c4\u03b7\u03bd \u03c6\u03bf\u03c1\u03ac \u03b8\u03b1 \u03b4\u03bf\u03cd\u03bc\u03b5 \u03c4\u03b7\u03bd \u03b1\u03c1\u03c7\u03b9\u03c4\u03b5\u03ba\u03c4\u03bf\u03bd\u03b9\u03ba\u03ae \u03bc\u03bd\u03ae\u03bc\u03b7\u03c2 \u03c4\u03b7\u03c2 PostgreSQL \u03ba\u03b1\u03b9 \u03c4\u03b9\u03c2 \u03b2\u03b1\u03c3\u03b9\u03ba\u03ad\u03c2 \u03c0\u03b1\u03c1\u03b1\u03bc\u03ad\u03c4\u03c1\u03bf\u03c5\u03c2 \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03b2\u03ad\u03bb\u03c4\u03b9\u03c3\u03c4\u03b7 \u03b1\u03c0\u03cc\u03b4\u03bf\u03c3\u03b7. \u03a4\u03bf \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03bf \u03bc\u03bd\u03ae\u03bc\u03b7 \u03c4\u03b7\u03c2 PostgreSQL \u03b4\u03b9\u03b1\u03c6\u03ad\u03c1\u03b5\u03b9 \u03c3\u03b7\u03bc\u03b1\u03bd\u03c4\u03b9\u03ba\u03ac \u03b1\u03c0\u03cc \u03b1\u03c5\u03c4\u03cc \u03c4\u03bf\u03c5 SQL Server \u03ae \u03c4\u03b7\u03c2 Oracle Database. \u0398\u03b1 \u03c0\u03c1\u03ad\u03c0\u03b5\u03b9 \u03bf\u03c0\u03c9\u03c3\u03b4\u03ae\u03c0\u03bf\u03c4\u03b5 \u03bd\u03b1 \u03b3\u03bd\u03c9\u03c1\u03af\u03b6\u03bf\u03c5\u03bc\u03b5 \u03c0\u03c9\u03c2 \u03ba\u03b1\u03c4\u03b1\u03bd\u03ad\u03bc\u03b5\u03c4\u03b1\u03b9 \u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7 \u03ce\u03c3\u03c4\u03b5 [&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-6042","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>\u03a0\u03ce\u03c2 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b5\u03af \u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7 \u03c3\u03c4\u03b7 PostgreSQL \u03ba\u03b1\u03b9 \u03c0\u03bf\u03b9\u03b5\u03c2 \u03c0\u03b1\u03c1\u03b1\u03bc\u03ad\u03c4\u03c1\u03bf\u03c5\u03c2 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class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.dataplatform.gr\\\/pos-leitoyrgei-mnimi-sti-postgresql-poies\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.dataplatform.gr\\\/pos-leitoyrgei-mnimi-sti-postgresql-poies\\\/\"},\"author\":{\"name\":\"Stratos Matzouranis\",\"@id\":\"https:\\\/\\\/www.dataplatform.gr\\\/#\\\/schema\\\/person\\\/e87bf4fd02b65cb6aa0942f87245bbaf\"},\"headline\":\"\u03a0\u03ce\u03c2 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b5\u03af \u03b7 \u03bc\u03bd\u03ae\u03bc\u03b7 \u03c3\u03c4\u03b7 PostgreSQL \u03ba\u03b1\u03b9 \u03c0\u03bf\u03b9\u03b5\u03c2 \u03c0\u03b1\u03c1\u03b1\u03bc\u03ad\u03c4\u03c1\u03bf\u03c5\u03c2 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