{"id":6134,"date":"2026-10-05T07:00:00","date_gmt":"2026-10-05T04:00:00","guid":{"rendered":"https:\/\/www.dataplatform.gr\/?p=6134"},"modified":"2026-10-05T13:12:46","modified_gmt":"2026-10-05T10:12:46","slug":"pos-mporoyme-na-parakoloythoyme-re","status":"publish","type":"post","link":"https:\/\/www.dataplatform.gr\/en\/pos-mporoyme-na-parakoloythoyme-re\/","title":{"rendered":"How can we monitor performance (Oracle AWR type) in PostgreSQL with a report using the pg_profile extension?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">\u038c\u03c4\u03b1\u03bd \u03b4\u03b9\u03b1\u03c7\u03b5\u03b9\u03c1\u03b9\u03b6\u03cc\u03bc\u03b1\u03c3\u03c4\u03b5 \u03b2\u03ac\u03c3\u03b5\u03b9\u03c2 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd PostgreSQL \u03c3\u03b5 \u03c0\u03b5\u03c1\u03b9\u03b2\u03ac\u03bb\u03bb\u03bf\u03bd\u03c4\u03b1 \u03c0\u03b1\u03c1\u03b1\u03b3\u03c9\u03b3\u03ae\u03c2, \u03ad\u03bd\u03b1 \u03b1\u03c0\u03cc \u03c4\u03b1 \u03bc\u03b5\u03b3\u03b1\u03bb\u03cd\u03c4\u03b5\u03c1\u03b1 \u03b6\u03b7\u03c4\u03bf\u03cd\u03bc\u03b5\u03bd\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 \u03bf \u03b5\u03bd\u03c4\u03bf\u03c0\u03b9\u03c3\u03bc\u03cc\u03c2 \u03c4\u03c9\u03bd queries \u03ba\u03b1\u03b9 \u03c4\u03c9\u03bd \u03b4\u03b9\u03b5\u03c1\u03b3\u03b1\u03c3\u03b9\u03ce\u03bd \u03c0\u03bf\u03c5 \u03ba\u03b1\u03c4\u03b1\u03bd\u03b1\u03bb\u03ce\u03bd\u03bf\u03c5\u03bd \u03c4\u03bf\u03c5\u03c2 \u03c0\u03b5\u03c1\u03b9\u03c3\u03c3\u03cc\u03c4\u03b5\u03c1\u03bf\u03c5\u03c2 \u03c0\u03cc\u03c1\u03bf\u03c5\u03c2. \u03a0\u03b1\u03c1\u03cc\u03bb\u03bf \u03c0\u03bf\u03c5 \u03b7 PostgreSQL \u03b4\u03b9\u03b1\u03b8\u03ad\u03c4\u03b5\u03b9 \u03b5\u03be\u03b1\u03b9\u03c1\u03b5\u03c4\u03b9\u03ba\u03ac \u03b5\u03c1\u03b3\u03b1\u03bb\u03b5\u03af\u03b1 \u03cc\u03c0\u03c9\u03c2 \u03c4\u03bf <code>pg_stat_statements<\/code>, \u03c3\u03c5\u03c7\u03bd\u03ac \u03c7\u03c1\u03b5\u03b9\u03b1\u03b6\u03cc\u03bc\u03b1\u03c3\u03c4\u03b5 \u03b9\u03c3\u03c4\u03bf\u03c1\u03b9\u03ba\u03ac workload reports \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03b1\u03bd\u03b1\u03bb\u03cd\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b9 \u03b1\u03ba\u03c1\u03b9\u03b2\u03ce\u03c2 \u03c3\u03c5\u03bd\u03ad\u03b2\u03b7 \u03c3\u03c4\u03bf \u03c3\u03cd\u03c3\u03c4\u03b7\u03bc\u03b1 \u03c0\u03c1\u03b9\u03bd \u03b1\u03c0\u03cc \u03bc\u03b5\u03c1\u03b9\u03ba\u03ad\u03c2 \u03ce\u03c1\u03b5\u03c2 \u03ae \u03b7\u03bc\u03ad\u03c1\u03b5\u03c2. <\/p>\n\n\n\n<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 \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03b5\u03b3\u03ba\u03b1\u03c4\u03b1\u03c3\u03c4\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5 \u03ba\u03b1\u03b9 \u03bd\u03b1 \u03c1\u03c5\u03b8\u03bc\u03af\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf <strong><code>pg_profile<\/code><\/strong>, extension, \u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b5\u03af \u03c3\u03b1\u03bd \u03ad\u03bd\u03b1 \u03b5\u03af\u03b4\u03bf\u03c2 <em>AWR Report<\/em> \u03c4\u03b7\u03c2 Oracle \u03b3\u03b9\u03b1 \u03c4\u03b7 PostgreSQL, \u03b5\u03c0\u03b9\u03c4\u03c1\u03ad\u03c0\u03bf\u03bd\u03c4\u03ac\u03c2 \u03bc\u03b1\u03c2 \u03bd\u03b1 \u03c0\u03b1\u03af\u03c1\u03bd\u03bf\u03c5\u03bc\u03b5 \u03b9\u03c3\u03c4\u03bf\u03c1\u03b9\u03ba\u03ac snapshots \u03ba\u03b1\u03b9 \u03bd\u03b1 \u03b5\u03be\u03ac\u03b3\u03bf\u03c5\u03bc\u03b5 \u03b1\u03bd\u03b1\u03bb\u03c5\u03c4\u03b9\u03ba\u03ac HTML reports.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u03a4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf pg_profile<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <code>pg_profile<\/code> \u03b5\u03af\u03bd\u03b1\u03b9 \u03ad\u03bd\u03b1 extension \u03b1\u03bd\u03bf\u03b9\u03c7\u03c4\u03bf\u03cd \u03ba\u03ce\u03b4\u03b9\u03ba\u03b1 \u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03ba\u03c1\u03b1\u03c4\u03ac\u03b5\u03b9 \u03b9\u03c3\u03c4\u03bf\u03c1\u03b9\u03ba\u03cc \u03b1\u03c0\u03cc samples.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03ce\u03bd\u03c4\u03b1\u03c2 \u03c4\u03bf, \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u039d\u03b1 \u03b5\u03bd\u03c4\u03bf\u03c0\u03af\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c0\u03bf\u03b9\u03b1 queries \u03ad\u03c1\u03b9\u03be\u03b1\u03bd \u03c4\u03b7\u03bd \u03b1\u03c0\u03cc\u03b4\u03bf\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03b2\u03ac\u03c3\u03b7\u03c2 \u03c3\u03b5 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03bf \u03c7\u03c1\u03bf\u03bd\u03b9\u03ba\u03cc \u03b4\u03b9\u03ac\u03c3\u03c4\u03b7\u03bc\u03b1.<\/li>\n\n\n\n<li>\u039d\u03b1 \u03c0\u03b1\u03c1\u03ac\u03b3\u03bf\u03c5\u03bc\u03b5 \u03ad\u03c4\u03bf\u03b9\u03bc\u03b1 <strong>HTML reports<\/strong> \u03bc\u03b5\u03c4\u03b1\u03be\u03cd \u03b4\u03cd\u03bf \u03c7\u03c1\u03bf\u03bd\u03b9\u03ba\u03ce\u03bd \u03c3\u03c4\u03b9\u03b3\u03bc\u03ce\u03bd (snapshots).<\/li>\n\n\n\n<li>\u039d\u03b1 \u03b1\u03c5\u03c4\u03bf\u03bc\u03b1\u03c4\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b7 \u03b4\u03b9\u03b1\u03b4\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 \u03bb\u03ae\u03c8\u03b7\u03c2 \u03b4\u03b5\u03b9\u03b3\u03bc\u03ac\u03c4\u03c9\u03bd.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">The installation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0393\u03b9\u03b1 \u03bd\u03b1 \u03b4\u03bf\u03c5\u03bb\u03ad\u03c8\u03b5\u03b9 \u03c3\u03c9\u03c3\u03c4\u03ac \u03c4\u03bf extension, \u03b8\u03b1 \u03c7\u03c1\u03b5\u03b9\u03b1\u03c3\u03c4\u03b5\u03af \u03bd\u03b1 \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c0\u03c1\u03ce\u03c4\u03b1 \u03c4\u03b1 \u03b1\u03c0\u03b1\u03c1\u03b1\u03af\u03c4\u03b7\u03c4\u03b1 extensions \u03b2\u03ac\u03c3\u03b7\u03c2 (<code>dblink<\/code> and <code>pg_stat_statements<\/code>), \u03c0\u03c1\u03ad\u03c0\u03b5\u03b9 \u03bd\u03b1 \u03b2\u03b5\u03b2\u03b1\u03b9\u03c9\u03b8\u03bf\u03cd\u03bc\u03b5 \u03cc\u03c4\u03b9 \u03c3\u03c4\u03bf <code>postgresql.conf<\/code> \u03c5\u03c0\u03ac\u03c1\u03c7\u03b5\u03b9 \u03b7 \u03b2\u03b9\u03b2\u03bb\u03b9\u03bf\u03b8\u03ae\u03ba\u03b7 <code>pg_stat_statements<\/code>:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" 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=\"\">su postgres\n\nvi $PGDATA\/postgresql.conf<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>shared_preload_libraries = 'pg_stat_statements'<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u039a\u03ac\u03bd\u03bf\u03c5\u03bc\u03b5 restart \u03c4\u03bf service:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" 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=\"\">sudo systemctl restart postgresql-14<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a3\u03c5\u03bd\u03b4\u03b5\u03cc\u03bc\u03b1\u03c3\u03c4\u03b5 \u03c3\u03c4\u03b7 \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03ba\u03b1\u03b9 \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03bf\u03cd\u03bc\u03b5 \u03c4\u03b1 extentions:<\/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=\"\">CREATE EXTENSION dblink;\nCREATE EXTENSION pg_stat_statements;\nCREATE EXTENSION pg_profile;<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u03a0\u03ce\u03c2 \u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03bf\u03c5\u03bc\u03b5 Snapshot \u03ba\u03b1\u03b9 \u03b2\u03b3\u03ac\u03b6\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf Report<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03c6\u03bf\u03cd \u03b5\u03b3\u03ba\u03b1\u03c4\u03b1\u03c3\u03c4\u03b1\u03b8\u03b5\u03af \u03c4\u03bf extension, \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c4\u03c1\u03ad\u03be\u03bf\u03c5\u03bc\u03b5 \u03c7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03b1 \u03c4\u03b7 \u03bb\u03ae\u03c8\u03b7 \u03b5\u03bd\u03cc\u03c2 \u03b4\u03b5\u03af\u03b3\u03bc\u03b1\u03c4\u03bf\u03c2 (snapshot) \u03bc\u03b5 \u03c4\u03b7\u03bd \u03b5\u03bd\u03c4\u03bf\u03bb\u03ae:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" 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 snapshot();<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03c6\u03bf\u03cd \u03c0\u03b5\u03c1\u03ac\u03c3\u03b5\u03b9 \u03ba\u03ac\u03c0\u03bf\u03b9\u03bf \u03c7\u03c1\u03bf\u03bd\u03b9\u03ba\u03cc \u03b4\u03b9\u03ac\u03c3\u03c4\u03b7\u03bc\u03b1 \u03ba\u03b1\u03b9 \u03c4\u03c1\u03ad\u03be\u03bf\u03c5\u03bc\u03b5 \u03be\u03b1\u03bd\u03ac \u03c4\u03b7 \u03c3\u03c5\u03bd\u03ac\u03c1\u03c4\u03b7\u03c3\u03b7, \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 \u03c4\u03b1 \u03b4\u03b9\u03b1\u03b8\u03ad\u03c3\u03b9\u03bc\u03b1 samples. \u039c\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03b4\u03bf\u03cd\u03bc\u03b5 \u03c4\u03b7 \u03bb\u03af\u03c3\u03c4\u03b1 \u03c4\u03bf\u03c5\u03c2 \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 *\nFROM samples \nORDER BY sample_id;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"581\" height=\"384\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-01.png\" alt=\"\" class=\"wp-image-6135\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-01.png 581w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-01-300x198.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-01-18x12.png 18w\" sizes=\"auto, (max-width: 581px) 100vw, 581px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\u0394\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03af\u03b1 HTML Report<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u0393\u03b9\u03b1 \u03bd\u03b1 \u03c0\u03ac\u03c1\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf report \u03b1\u03c0\u03cc\u03b4\u03bf\u03c3\u03b7\u03c2 \u03bc\u03b5\u03c4\u03b1\u03be\u03cd \u03b4\u03cd\u03bf snapshots (\u03c0.\u03c7. \u03b1\u03c0\u03cc \u03c4\u03bf ID <code>1<\/code> \u03c3\u03c4\u03bf ID <code>2<\/code>), \u03b5\u03ba\u03c4\u03b5\u03bb\u03bf\u03cd\u03bc\u03b5:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" 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 get_report(1, 2);<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"503\" height=\"272\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-02.png\" alt=\"\" class=\"wp-image-6136\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-02.png 503w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-02-300x162.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-02-18x10.png 18w\" sizes=\"auto, (max-width: 503px) 100vw, 503px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a4\u03bf \u03b1\u03c0\u03bf\u03c4\u03ad\u03bb\u03b5\u03c3\u03bc\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 \u03ba\u03ce\u03b4\u03b9\u03ba\u03b1\u03c2 HTML, \u03c4\u03bf\u03bd \u03bf\u03c0\u03bf\u03af\u03bf \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03b1\u03bd\u03c4\u03b9\u03b3\u03c1\u03ac\u03c8\u03bf\u03c5\u03bc\u03b5, \u03bd\u03b1 \u03c4\u03bf\u03bd \u03b1\u03c0\u03bf\u03b8\u03b7\u03ba\u03b5\u03cd\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c3\u03b5 \u03ad\u03bd\u03b1 \u03b1\u03c1\u03c7\u03b5\u03af\u03bf <code>.html<\/code> \u03ba\u03b1\u03b9 \u03bd\u03b1 \u03c4\u03bf\u03bd \u03b1\u03bd\u03bf\u03af\u03be\u03bf\u03c5\u03bc\u03b5 \u03c3\u03c4\u03bf\u03bd browser \u03bc\u03b1\u03c2 \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03b4\u03bf\u03cd\u03bc\u03b5 \u03b1\u03bd\u03b1\u03bb\u03c5\u03c4\u03b9\u03ba\u03ac \u03c4\u03b1 \u03c3\u03c4\u03b1\u03c4\u03b9\u03c3\u03c4\u03b9\u03ba\u03ac \u03c4\u03b7\u03c2 \u03b2\u03ac\u03c3\u03b7\u03c2 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"936\" height=\"643\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-03.png\" alt=\"\" class=\"wp-image-6137\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-03.png 936w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-03-300x206.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-03-768x528.png 768w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-03-18x12.png 18w\" sizes=\"auto, (max-width: 936px) 100vw, 936px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0391\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1 Snapshots \u03bc\u03ad\u03c3\u03c9 Cron Job<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0395\u03c0\u03b5\u03b9\u03b4\u03ae \u03b7 PostgreSQL \u03b4\u03b5\u03bd \u03b4\u03b9\u03b1\u03b8\u03ad\u03c4\u03b5\u03b9 \u03b5\u03c3\u03c9\u03c4\u03b5\u03c1\u03b9\u03ba\u03cc job scheduler, \u03bf \u03b5\u03c0\u03af\u03c3\u03b7\u03bc\u03bf\u03c2 \u03ba\u03b1\u03b9 \u03c0\u03b9\u03bf \u03b1\u03be\u03b9\u03cc\u03c0\u03b9\u03c3\u03c4\u03bf\u03c2 \u03c4\u03c1\u03cc\u03c0\u03bf\u03c2 \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03b1\u03c5\u03c4\u03bf\u03bc\u03b1\u03c4\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b7 \u03bb\u03ae\u03c8\u03b7 \u03c4\u03c9\u03bd snapshots \u03b5\u03af\u03bd\u03b1\u03b9 \u03bc\u03ad\u03c3\u03c9 \u03c4\u03bf\u03c5 <strong>cron<\/strong> \u03c4\u03bf\u03c5 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b9\u03ba\u03bf\u03cd \u03c3\u03c5\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03bf\u03c2 Linux, \u03b1\u03ba\u03bf\u03bb\u03bf\u03c5\u03b8\u03ce\u03bd\u03c4\u03b1\u03c2 \u03c4\u03b7 \u03c6\u03b9\u03bb\u03bf\u03c3\u03bf\u03c6\u03af\u03b1 \u03c4\u03bf\u03c5 \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03bf\u03cd \u03c4\u03bf\u03c5 \u03b5\u03c1\u03b3\u03b1\u03bb\u03b5\u03af\u03bf\u03c5.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0393\u03b9\u03b1 \u03bd\u03b1 \u03b3\u03af\u03bd\u03b5\u03b9 \u03b1\u03c5\u03c4\u03cc \u03b1\u03bd\u03bf\u03af\u03b3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf crontab \u03c4\u03bf\u03c5 \u03c7\u03c1\u03ae\u03c3\u03c4\u03b7 <code>postgres<\/code> \u03c3\u03c4\u03bf \u03c4\u03b5\u03c1\u03bc\u03b1\u03c4\u03b9\u03ba\u03cc:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" 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=\"\">sudo crontab -u postgres -e<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a0\u03c1\u03bf\u03c3\u03b8\u03ad\u03c4\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b7\u03bd \u03c0\u03b1\u03c1\u03b1\u03ba\u03ac\u03c4\u03c9 \u03b3\u03c1\u03b1\u03bc\u03bc\u03ae \u03ce\u03c3\u03c4\u03b5 \u03bd\u03b1 \u03b5\u03ba\u03c4\u03b5\u03bb\u03b5\u03af\u03c4\u03b1\u03b9 \u03b7 \u03bb\u03ae\u03c8\u03b7 snapshot \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1 \u03ba\u03ac\u03b8\u03b5 1 \u03ce\u03c1\u03b1:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" 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=\"\">0 * * * * psql -d db_test -c \"SELECT snapshot();\"<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Snapshot Retention<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u0388\u03bd\u03b1 \u03ba\u03c1\u03af\u03c3\u03b9\u03bc\u03bf \u03b6\u03ae\u03c4\u03b7\u03bc\u03b1 \u03ba\u03b1\u03c4\u03ac \u03c4\u03b7 \u03c3\u03c5\u03bb\u03bb\u03bf\u03b3\u03ae \u03b9\u03c3\u03c4\u03bf\u03c1\u03b9\u03ba\u03ce\u03bd \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03b1\u03c0\u03cc\u03b4\u03bf\u03c3\u03b7\u03c2 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b7 \u03b1\u03c0\u03bf\u03c6\u03c5\u03b3\u03ae \u03c4\u03b7\u03c2 \u03b1\u03bd\u03b5\u03be\u03ad\u03bb\u03b5\u03b3\u03ba\u03c4\u03b7\u03c2 \u03b1\u03cd\u03be\u03b7\u03c3\u03b7\u03c2 \u03c4\u03bf\u03c5 \u03bc\u03b5\u03b3\u03ad\u03b8\u03bf\u03c5\u03c2 \u03c4\u03b7\u03c2 \u03b2\u03ac\u03c3\u03b7\u03c2. \u03a4\u03bf <code>pg_profile<\/code> \u03b4\u03b9\u03b1\u03b8\u03ad\u03c4\u03b5\u03b9 retention policy \u03b7 \u03bf\u03c0\u03bf\u03af\u03b1 \u03b5\u03bb\u03ad\u03b3\u03c7\u03b5\u03c4\u03b1\u03b9 \u03b1\u03c0\u03cc \u03c4\u03b7\u03bd \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf <code>max_sample_age<\/code> \u03b1\u03bd\u03ac server. \u039f\u03c1\u03af\u03b6\u03bf\u03bd\u03c4\u03b1\u03c2 \u03b3\u03b9\u03b1 \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1 \u03c4\u03bf \u03cc\u03c1\u03b9\u03bf \u03c3\u03b5 7 \u03b7\u03bc\u03ad\u03c1\u03b5\u03c2 \u03bc\u03ad\u03c3\u03c9 \u03c4\u03b7\u03c2 \u03c3\u03c5\u03bd\u03ac\u03c1\u03c4\u03b7\u03c3\u03b7\u03c2:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" 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 set_server_max_sample_age('local', 7);<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u039c\u03b5 \u03b1\u03c5\u03c4\u03cc \u03c4\u03bf \u03c4\u03c1\u03cc\u03c0\u03bf \u03b5\u03be\u03b1\u03c3\u03c6\u03b1\u03bb\u03af\u03b6\u03bf\u03c5\u03bc\u03b5 \u03cc\u03c4\u03b9 \u03c4\u03b1 \u03c0\u03b1\u03bb\u03b1\u03b9\u03cc\u03c4\u03b5\u03c1\u03b1 snapshots \u03ba\u03b1\u03b8\u03b1\u03c1\u03af\u03b6\u03bf\u03bd\u03c4\u03b1\u03b9 <strong>\u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1<\/strong> \u03b1\u03c0\u03cc \u03c4\u03bf \u03af\u03b4\u03b9\u03bf \u03c4\u03bf extension \u03ba\u03ac\u03b8\u03b5 \u03c6\u03bf\u03c1\u03ac \u03c0\u03bf\u03c5 \u03b5\u03ba\u03c4\u03b5\u03bb\u03b5\u03af\u03c4\u03b1\u03b9 \u03b7 \u03b4\u03b9\u03b1\u03b4\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 \u03c4\u03bf\u03c5 \u03bd\u03ad\u03bf\u03c5 snapshot. \u0388\u03c4\u03c3\u03b9 \u03b4\u03b9\u03b1\u03c4\u03b7\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bc\u03b9\u03b1 \u03c3\u03c4\u03b1\u03b8\u03b5\u03c1\u03ae \u03ba\u03b1\u03c4\u03b1\u03bd\u03ac\u03bb\u03c9\u03c3\u03b7 \u03b1\u03c0\u03bf\u03b8\u03b7\u03ba\u03b5\u03c5\u03c4\u03b9\u03ba\u03bf\u03cd \u03c7\u03ce\u03c1\u03bf\u03c5, \u03b1\u03c0\u03bf\u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03bf\u03bd\u03c4\u03b1\u03c2 \u03c4\u03b1\u03c5\u03c4\u03cc\u03c7\u03c1\u03bf\u03bd\u03b1 \u03c4\u03bf \u03b1\u03c0\u03b1\u03c1\u03b1\u03af\u03c4\u03b7\u03c4\u03bf \u03b9\u03c3\u03c4\u03bf\u03c1\u03b9\u03ba\u03cc \u03b2\u03ac\u03b8\u03bf\u03c2 \u03b3\u03b9\u03b1 \u03c4\u03b9\u03c2 \u03b1\u03bd\u03b1\u03bb\u03cd\u03c3\u03b5\u03b9\u03c2 \u03bc\u03b1\u03c2 \u03c7\u03c9\u03c1\u03af\u03c2 \u03c7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03b5\u03c2 \u03c0\u03b1\u03c1\u03b5\u03bc\u03b2\u03ac\u03c3\u03b5\u03b9\u03c2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0393\u03b9\u03b1 \u03bd\u03b1 \u03b4\u03bf\u03cd\u03bc\u03b5 \u03c4\u03b7\u03bd \u03c1\u03cd\u03b8\u03bc\u03b9\u03c3\u03b7 \u03c4\u03bf\u03c5 <code>max_sample_age<\/code>, \u03c4\u03c1\u03ad\u03c7\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf \u03c0\u03b1\u03c1\u03b1\u03ba\u03ac\u03c4\u03c9:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" 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 server_id, server_name, connstr, enabled, max_sample_age \nFROM servers;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"687\" height=\"251\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-04.png\" alt=\"\" class=\"wp-image-6139\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-04.png 687w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-04-300x110.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/08\/pgpro-04-18x7.png 18w\" sizes=\"auto, (max-width: 687px) 100vw, 687px\" \/><\/figure>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u0395\u03bd\u03b1\u03bb\u03bb\u03b1\u03ba\u03c4\u03b9\u03ba\u03ac \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c0\u03c1\u03bf\u03c3\u03b8\u03ad\u03c3\u03bf\u03c5\u03bc\u03b5 \u03ba\u03b1\u03b9 \u03ad\u03bd\u03b1 cron job \u03ce\u03c3\u03c4\u03b5 \u03ba\u03b1\u03b8\u03b1\u03c1\u03af\u03b6\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b1 \u03c0\u03b1\u03bb\u03b9\u03ac snapshots \u03ba\u03b1\u03b9 \u03bd\u03b1 \u03ad\u03c7\u03bf\u03c5\u03bc\u03b5 retention 7 \u03b7\u03bc\u03b5\u03c1\u03ce\u03bd:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" 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=\"\">0 2 * * * psql -d db_test -c \"DELETE FROM samples WHERE sample_time &amp;lt; NOW() - INTERVAL '7 days';\"<\/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<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/github.com\/zubkov-andrei\/pg_profile\" data-type=\"link\" data-id=\"https:\/\/github.com\/zubkov-andrei\/pg_profile\">pg_profile<\/a><\/li>\n\n\n\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>\u038c\u03c4\u03b1\u03bd \u03b4\u03b9\u03b1\u03c7\u03b5\u03b9\u03c1\u03b9\u03b6\u03cc\u03bc\u03b1\u03c3\u03c4\u03b5 \u03b2\u03ac\u03c3\u03b5\u03b9\u03c2 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd PostgreSQL \u03c3\u03b5 \u03c0\u03b5\u03c1\u03b9\u03b2\u03ac\u03bb\u03bb\u03bf\u03bd\u03c4\u03b1 \u03c0\u03b1\u03c1\u03b1\u03b3\u03c9\u03b3\u03ae\u03c2, \u03ad\u03bd\u03b1 \u03b1\u03c0\u03cc \u03c4\u03b1 \u03bc\u03b5\u03b3\u03b1\u03bb\u03cd\u03c4\u03b5\u03c1\u03b1 \u03b6\u03b7\u03c4\u03bf\u03cd\u03bc\u03b5\u03bd\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 \u03bf \u03b5\u03bd\u03c4\u03bf\u03c0\u03b9\u03c3\u03bc\u03cc\u03c2 \u03c4\u03c9\u03bd queries \u03ba\u03b1\u03b9 \u03c4\u03c9\u03bd \u03b4\u03b9\u03b5\u03c1\u03b3\u03b1\u03c3\u03b9\u03ce\u03bd \u03c0\u03bf\u03c5 \u03ba\u03b1\u03c4\u03b1\u03bd\u03b1\u03bb\u03ce\u03bd\u03bf\u03c5\u03bd \u03c4\u03bf\u03c5\u03c2 \u03c0\u03b5\u03c1\u03b9\u03c3\u03c3\u03cc\u03c4\u03b5\u03c1\u03bf\u03c5\u03c2 \u03c0\u03cc\u03c1\u03bf\u03c5\u03c2. \u03a0\u03b1\u03c1\u03cc\u03bb\u03bf \u03c0\u03bf\u03c5 \u03b7 PostgreSQL \u03b4\u03b9\u03b1\u03b8\u03ad\u03c4\u03b5\u03b9 \u03b5\u03be\u03b1\u03b9\u03c1\u03b5\u03c4\u03b9\u03ba\u03ac \u03b5\u03c1\u03b3\u03b1\u03bb\u03b5\u03af\u03b1 \u03cc\u03c0\u03c9\u03c2 \u03c4\u03bf pg_stat_statements, \u03c3\u03c5\u03c7\u03bd\u03ac \u03c7\u03c1\u03b5\u03b9\u03b1\u03b6\u03cc\u03bc\u03b1\u03c3\u03c4\u03b5 \u03b9\u03c3\u03c4\u03bf\u03c1\u03b9\u03ba\u03ac workload reports \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03b1\u03bd\u03b1\u03bb\u03cd\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b9 \u03b1\u03ba\u03c1\u03b9\u03b2\u03ce\u03c2 \u03c3\u03c5\u03bd\u03ad\u03b2\u03b7 \u03c3\u03c4\u03bf \u03c3\u03cd\u03c3\u03c4\u03b7\u03bc\u03b1 \u03c0\u03c1\u03b9\u03bd \u03b1\u03c0\u03cc \u03bc\u03b5\u03c1\u03b9\u03ba\u03ad\u03c2 \u03ce\u03c1\u03b5\u03c2 \u03ae \u03b7\u03bc\u03ad\u03c1\u03b5\u03c2. 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