{"id":6248,"date":"2026-11-02T07:00:00","date_gmt":"2026-11-02T04:00:00","guid":{"rendered":"https:\/\/www.dataplatform.gr\/?p=6248"},"modified":"2026-10-30T22:24:45","modified_gmt":"2026-10-30T19:24:45","slug":"ti-timescaledb-tiger-data-pos-diacheirizomast","status":"publish","type":"post","link":"https:\/\/www.dataplatform.gr\/en\/ti-timescaledb-tiger-data-pos-diacheirizomast\/","title":{"rendered":"What is TimescaleDB (Tiger Data) and how do we manage Time-Series data in PostgreSQL?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">\u03a3\u03c4\u03b1 \u03c3\u03cd\u03b3\u03c7\u03c1\u03bf\u03bd\u03b1 \u03c0\u03b5\u03c1\u03b9\u03b2\u03ac\u03bb\u03bb\u03bf\u03bd\u03c4\u03b1 \u03b2\u03ac\u03c3\u03b5\u03c9\u03bd \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd, \u03cc\u03bb\u03bf \u03ba\u03b1\u03b9 \u03c0\u03b9\u03bf \u03c3\u03c5\u03c7\u03bd\u03ac \u03ba\u03b1\u03bb\u03bf\u03cd\u03bc\u03b1\u03c3\u03c4\u03b5 \u03bd\u03b1 \u03b1\u03c0\u03bf\u03b8\u03b7\u03ba\u03b5\u03cd\u03c3\u03bf\u03c5\u03bc\u03b5 \u03ba\u03b1\u03b9 \u03bd\u03b1 \u03b1\u03bd\u03b1\u03bb\u03cd\u03c3\u03bf\u03c5\u03bc\u03b5 <strong>Time-Series \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1<\/strong>. \u03a4\u03ad\u03c4\u03bf\u03b9\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b3\u03b9\u03b1 \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1 \u03bf\u03b9 \u03bc\u03b5\u03c4\u03c1\u03ae\u03c3\u03b5\u03b9\u03c2 \u03b1\u03c0\u03cc \u03b1\u03b9\u03c3\u03b8\u03b7\u03c4\u03ae\u03c1\u03b5\u03c2 (IoT), \u03c4\u03b1 metrics \u03c0\u03b1\u03c1\u03b1\u03ba\u03bf\u03bb\u03bf\u03cd\u03b8\u03b7\u03c3\u03b7\u03c2 \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd (CPU, RAM), \u03c4\u03b1 logs \u03b5\u03c6\u03b1\u03c1\u03bc\u03bf\u03b3\u03ce\u03bd \u03ae \u03bf\u03b9 \u03bf\u03b9\u03ba\u03bf\u03bd\u03bf\u03bc\u03b9\u03ba\u03ad\u03c2 \u03c3\u03c5\u03bd\u03b1\u03bb\u03bb\u03b1\u03b3\u03ad\u03c2, \u03cc\u03c0\u03bf\u03c5 \u03ba\u03ac\u03b8\u03b5 \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ae \u03c3\u03c5\u03bd\u03bf\u03b4\u03b5\u03cd\u03b5\u03c4\u03b1\u03b9 \u03b1\u03c0\u03cc \u03ad\u03bd\u03b1 timestamp.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u038c\u03c4\u03b1\u03bd \u03b1\u03c5\u03c4\u03ac \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03c6\u03c4\u03ac\u03c3\u03bf\u03c5\u03bd \u03c3\u03b5 \u03b4\u03b9\u03c3\u03b5\u03ba\u03b1\u03c4\u03bf\u03bc\u03bc\u03cd\u03c1\u03b9\u03b1 \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ad\u03c2, \u03ad\u03bd\u03b1\u03c2 \u03ba\u03bb\u03b1\u03c3\u03b9\u03ba\u03cc\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b1\u03c2 \u03c3\u03c4\u03b7 PostgreSQL \u03b1\u03c1\u03c7\u03af\u03b6\u03b5\u03b9 \u03bd\u03b1 \u03b1\u03bd\u03c4\u03b9\u03bc\u03b5\u03c4\u03c9\u03c0\u03af\u03b6\u03b5\u03b9 \u03c0\u03c1\u03bf\u03b2\u03bb\u03ae\u03bc\u03b1\u03c4\u03b1: \u03c4\u03b1 indexes \u03bc\u03b5\u03b3\u03b1\u03bb\u03ce\u03bd\u03bf\u03c5\u03bd, \u03b7 \u03c4\u03b1\u03c7\u03cd\u03c4\u03b7\u03c4\u03b1 \u03c4\u03c9\u03bd <code>INSERT<\/code> and <code>SELECT<\/code> \u03c0\u03ad\u03c6\u03c4\u03b5\u03b9, \u03ba\u03b1\u03b9 \u03b7 \u03c7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03b7 \u03b4\u03b9\u03b1\u03c7\u03b5\u03af\u03c1\u03b9\u03c3\u03b7 \u03c4\u03c9\u03bd partitions \u03b3\u03af\u03bd\u03b5\u03c4\u03b1\u03b9 \u03bc\u03c0\u03b5\u03bb\u03ac\u03c2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0395\u03b4\u03ce \u03ad\u03c1\u03c7\u03b5\u03c4\u03b1\u03b9 \u03b7 <strong>TimescaleDB<\/strong> (\u03b7 \u03bf\u03c0\u03bf\u03af\u03b1 \u03c0\u03bb\u03ad\u03bf\u03bd \u03ad\u03c7\u03b5\u03b9 \u03bc\u03b5\u03c4\u03bf\u03bd\u03bf\u03bc\u03b1\u03c3\u03c4\u03b5\u03af \u03c3\u03b5 <strong>TigerData<\/strong>, \u03b1\u03bd \u03ba\u03b1\u03b9 \u03c3\u03b5 \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf \u03c0\u03b1\u03ba\u03ad\u03c4\u03c9\u03bd \u03ba\u03b1\u03b9 \u03b5\u03bd\u03c4\u03bf\u03bb\u03ce\u03bd \u03b4\u03b9\u03b1\u03c4\u03b7\u03c1\u03b5\u03af \u03c4\u03bf \u03cc\u03bd\u03bf\u03bc\u03b1 <code>timescaledb<\/code>). \u03a0\u03c1\u03cc\u03ba\u03b5\u03b9\u03c4\u03b1\u03b9 \u03b3\u03b9\u03b1 \u03ad\u03bd\u03b1 extension \u03c4\u03b7\u03c2 PostgreSQL \u03c0\u03bf\u03c5 \u03c4\u03b7 \u03bc\u03b5\u03c4\u03b1\u03c4\u03c1\u03ad\u03c0\u03b5\u03b9 \u03c3\u03b5 \u03bc\u03b9\u03b1 Time-Series \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd, \u03c7\u03c9\u03c1\u03af\u03c2 \u03bd\u03b1 \u03c7\u03ac\u03bd\u03bf\u03c5\u03bc\u03b5 \u03c4\u03af\u03c0\u03bf\u03c4\u03b1 \u03b1\u03c0\u03cc \u03c4\u03b7\u03bd PostgreSQL. \u03a4\u03b1 \u03b4\u03cd\u03bf \u03bc\u03b5\u03b3\u03b1\u03bb\u03cd\u03c4\u03b5\u03c1\u03b1 \u03c7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03b9\u03c3\u03c4\u03b9\u03ba\u03ac \u03c4\u03b7\u03c2 \u03b5\u03af\u03bd\u03b1\u03b9:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Hypertables &amp; Chunks:<\/strong> \u0391\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03bf partitioning \u03c4\u03c9\u03bd \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03bc\u03b5 \u03b2\u03ac\u03c3\u03b7 \u03c4\u03bf\u03bd \u03c7\u03c1\u03cc\u03bd\u03bf, \u03c7\u03c9\u03c1\u03af\u03c2 \u03ba\u03b1\u03bc\u03af\u03b1 \u03c7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03b7 \u03c0\u03b1\u03c1\u03ad\u03bc\u03b2\u03b1\u03c3\u03b7 \u03b1\u03c0\u03cc \u03c4\u03bf\u03bd DBA.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Hypercore (Columnar Compression):<\/strong> \u039c\u03b5\u03c4\u03b1\u03c4\u03c1\u03bf\u03c0\u03ae \u03c4\u03c9\u03bd \u03c0\u03b1\u03bb\u03b1\u03b9\u03cc\u03c4\u03b5\u03c1\u03c9\u03bd \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03b1\u03c0\u03cc \u03b3\u03c1\u03b1\u03bc\u03bc\u03ad\u03c2 (Row-store) \u03c3\u03b5 \u03c3\u03c4\u03ae\u03bb\u03b5\u03c2 (Columnstore) \u03ba\u03b1\u03b9 \u03c3\u03c5\u03bc\u03c0\u03af\u03b5\u03c3\u03ae \u03c4\u03bf\u03c5\u03c2, \u03b5\u03be\u03bf\u03b9\u03ba\u03bf\u03bd\u03bf\u03bc\u03ce\u03bd\u03c4\u03b1\u03c2 \u03c3\u03c5\u03c7\u03bd\u03ac \u03c0\u03ac\u03bd\u03c9 \u03b1\u03c0\u03cc <strong>90% \u03c7\u03ce\u03c1\u03bf \u03c3\u03c4\u03bf\u03bd \u03b4\u03af\u03c3\u03ba\u03bf<\/strong>.<\/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 \u03b2\u03ae\u03bc\u03b1-\u03b2\u03ae\u03bc\u03b1 \u03c0\u03ce\u03c2 \u03bd\u03b1 \u03b5\u03b3\u03ba\u03b1\u03c4\u03b1\u03c3\u03c4\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5, \u03bd\u03b1 \u03c1\u03c5\u03b8\u03bc\u03af\u03c3\u03bf\u03c5\u03bc\u03b5 \u03ba\u03b1\u03b9 \u03bd\u03b1 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b7\u03bd <strong>TimescaleDB<\/strong> in an environment <strong>PostgreSQL 14<\/strong> and <strong>RHEL Linux 7<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0395\u03b3\u03ba\u03b1\u03c4\u03ac\u03c3\u03c4\u03b1\u03c3\u03b7 \u03c4\u03b7\u03c2 TimescaleDB<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03c1\u03c7\u03b9\u03ba\u03ac, \u03c0\u03c1\u03bf\u03c3\u03b8\u03ad\u03c4\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf \u03b5\u03c0\u03af\u03c3\u03b7\u03bc\u03bf repository \u03c4\u03b7\u03c2 TimescaleDB \u03c3\u03c4\u03bf \u03c3\u03cd\u03c3\u03c4\u03b7\u03bc\u03ac \u03bc\u03b1\u03c2, \u03c3\u03c4\u03b7 \u03c0\u03c1\u03bf\u03ba\u03b5\u03b9\u03bc\u03ad\u03bd\u03b7 \u03c0\u03b5\u03c1\u03af\u03c0\u03c4\u03c9\u03c3\u03b7 \u03b5\u03af\u03bd\u03b1\u03b9 RHEL 7:<\/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 tee \/etc\/yum.repos.d\/timescale_timescaledb.repo &lt;&lt;'EOF'\n[timescale_timescaledb]\nname=TimescaleDB\nbaseurl=https:\/\/packagecloud.io\/timescale\/timescaledb\/el\/7\/$basearch\nenabled=1\ngpgcheck=0\nrepo_gpgcheck=0\nsslverify=1\nmetadata_expire=300\nEOF<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u039a\u03b1\u03b8\u03b1\u03c1\u03af\u03b6\u03bf\u03c5\u03bc\u03b5 \u03c4\u03c5\u03c7\u03cc\u03bd \u03c0\u03b1\u03bb\u03b9\u03cc\u03c4\u03b5\u03c1\u03b1 repositories \u03ba\u03b1\u03b9 \u03c4\u03b7\u03bd cache \u03c4\u03bf\u03c5 <code>yum<\/code>, \u03ba\u03b1\u03b9 \u03c0\u03c1\u03bf\u03c7\u03c9\u03c1\u03ac\u03bc\u03b5 \u03c3\u03c4\u03b7\u03bd \u03b5\u03b3\u03ba\u03b1\u03c4\u03ac\u03c3\u03c4\u03b1\u03c3\u03b7 \u03c4\u03bf\u03c5 \u03c0\u03b1\u03ba\u03ad\u03c4\u03bf\u03c5 \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd PostgreSQL 14:<\/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 rm -f \/etc\/yum.repos.d\/timescaledb.repo\nsudo yum clean all\n\nsudo yum install -y --nogpgcheck timescaledb-2-postgresql-14<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0397 TimescaleDB \u03c3\u03c5\u03bd\u03bf\u03b4\u03b5\u03cd\u03b5\u03c4\u03b1\u03b9 \u03b1\u03c0\u03cc \u03c4\u03bf \u03b5\u03c1\u03b3\u03b1\u03bb\u03b5\u03af\u03bf <code>timescaledb-tune<\/code>, \u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03b4\u03b9\u03b1\u03b2\u03ac\u03b6\u03b5\u03b9 \u03c4\u03bf\u03c5\u03c2 \u03c0\u03cc\u03c1\u03bf\u03c5\u03c2 \u03c4\u03bf\u03c5 server \u03bc\u03b1\u03c2 (CPU, RAM) \u03ba\u03b1\u03b9 \u03c1\u03c5\u03b8\u03bc\u03af\u03b6\u03b5\u03b9 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1 \u03c4\u03bf \u03b1\u03c1\u03c7\u03b5\u03af\u03bf <code>postgresql.conf<\/code> \u03b3\u03b9\u03b1 \u03b2\u03ad\u03bb\u03c4\u03b9\u03c3\u03c4\u03b7 \u03b1\u03c0\u03cc\u03b4\u03bf\u03c3\u03b7, \u03b5\u03bd\u03ce \u03c0\u03c1\u03bf\u03c3\u03b8\u03ad\u03c4\u03b5\u03b9 \u03ba\u03b1\u03b9 \u03c4\u03b7 \u03b2\u03b9\u03b2\u03bb\u03b9\u03bf\u03b8\u03ae\u03ba\u03b7 \u03c4\u03b7\u03c2 TimescaleDB \u03c3\u03c4\u03bf <code>shared_preload_libraries<\/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=\"\">sudo timescaledb-tune --pg-config=\/usr\/pgsql-14\/bin\/pg_config<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"919\" height=\"1024\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_01-919x1024.png\" alt=\"\" class=\"wp-image-6250\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_01-919x1024.png 919w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_01-269x300.png 269w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_01-11x12.png 11w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_01-768x855.png 768w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_01.png 1161w\" sizes=\"auto, (max-width: 919px) 100vw, 919px\" \/><figcaption class=\"wp-element-caption\">01<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03c6\u03bf\u03cd \u03bf\u03bb\u03bf\u03ba\u03bb\u03b7\u03c1\u03c9\u03b8\u03b5\u03af \u03b7 \u03c1\u03cd\u03b8\u03bc\u03b9\u03c3\u03b7, \u03b5\u03c0\u03b1\u03bd\u03b5\u03ba\u03ba\u03b9\u03bd\u03bf\u03cd\u03bc\u03b5 \u03c4\u03b7\u03bd PostgreSQL \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03b5\u03c6\u03b1\u03c1\u03bc\u03bf\u03c3\u03c4\u03bf\u03cd\u03bd \u03bf\u03b9 \u03b1\u03bb\u03bb\u03b1\u03b3\u03ad\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=\"\">sudo systemctl restart postgresql-14\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a3\u03c5\u03bd\u03b4\u03b5\u03cc\u03bc\u03b1\u03c3\u03c4\u03b5 \u03c3\u03c4\u03b7 PostgreSQL \u03ba\u03b1\u03b9 \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03bf\u03cd\u03bc\u03b5 \u03c4\u03bf extension \u03c4\u03b7\u03c2 TimescaleDB:<\/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 -u postgres psql<\/pre>\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=\"\">CREATE EXTENSION IF NOT EXISTS timescaledb;\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0394\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03af\u03b1 Hypertable \u03ba\u03b1\u03b9 \u0395\u03b9\u03c3\u03b1\u03b3\u03c9\u03b3\u03ae \u0394\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>Hypertable<\/strong> \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf \u03ba\u03cd\u03c1\u03b9\u03bf \u03c0\u03bb\u03b5\u03bf\u03bd\u03ad\u03ba\u03c4\u03b7\u03bc\u03b1 \u03c4\u03b7\u03c2 TimescaleDB. \u0393\u03b9\u03b1 \u03c4\u03bf\u03bd \u03c7\u03c1\u03ae\u03c3\u03c4\u03b7 \u03c6\u03b1\u03af\u03bd\u03b5\u03c4\u03b1\u03b9 \u03ba\u03b1\u03b9 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b5\u03af \u03b1\u03ba\u03c1\u03b9\u03b2\u03ce\u03c2 \u03cc\u03c0\u03c9\u03c2 \u03ad\u03bd\u03b1\u03c2 \u03ba\u03b1\u03bd\u03bf\u03bd\u03b9\u03ba\u03cc\u03c2 \u03c0\u03af\u03bd\u03b1\u03ba\u03b1\u03c2. \u03a3\u03c4\u03bf \u03c0\u03b1\u03c1\u03b1\u03c3\u03ba\u03ae\u03bd\u03b9\u03bf \u03cc\u03bc\u03c9\u03c2, \u03b7 TimescaleDB \u03c3\u03c0\u03ac\u03b5\u03b9 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1 \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03c3\u03b5 \u03bc\u03b9\u03ba\u03c1\u03cc\u03c4\u03b5\u03c1\u03b1 \u03c7\u03c1\u03bf\u03bd\u03b9\u03ba\u03ac partitions \u03c0\u03bf\u03c5 \u03bf\u03bd\u03bf\u03bc\u03ac\u03b6\u03bf\u03bd\u03c4\u03b1\u03b9 <strong>Chunks<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03c1\u03c7\u03b9\u03ba\u03ac, \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03bf\u03cd\u03bc\u03b5 \u03ad\u03bd\u03b1\u03bd \u03ba\u03bb\u03b1\u03c3\u03b9\u03ba\u03cc \u03c0\u03af\u03bd\u03b1\u03ba\u03b1 PostgreSQL \u03c0\u03bf\u03c5 \u03b8\u03b1 \u03ba\u03c1\u03b1\u03c4\u03ac\u03b5\u03b9 \u03bc\u03b5\u03c4\u03c1\u03ae\u03c3\u03b5\u03b9\u03c2 \u03b1\u03c0\u03cc \u03b1\u03b9\u03c3\u03b8\u03b7\u03c4\u03ae\u03c1\u03b5\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=\"\">CREATE TABLE sensor_data (\n    time TIMESTAMPTZ NOT NULL,\n    sensor_id INT NOT NULL,\n    temperature DOUBLE PRECISION,\n    cpu_load DOUBLE PRECISION\n);<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a3\u03c4\u03b7 \u03c3\u03c5\u03bd\u03ad\u03c7\u03b5\u03b9\u03b1, \u03bc\u03b5 \u03bc\u03af\u03b1 \u03bc\u03cc\u03bd\u03bf \u03b5\u03bd\u03c4\u03bf\u03bb\u03ae, \u03c4\u03bf\u03bd \u03bc\u03b5\u03c4\u03b1\u03c4\u03c1\u03ad\u03c0\u03bf\u03c5\u03bc\u03b5 \u03c3\u03b5 <strong>Hypertable<\/strong>, \u03bf\u03c1\u03af\u03b6\u03bf\u03bd\u03c4\u03b1\u03c2 \u03cc\u03c4\u03b9 \u03b8\u03ad\u03bb\u03bf\u03c5\u03bc\u03b5 \u03bd\u03b1 \u03c7\u03c9\u03c1\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1 \u03c3\u03b5 <strong>Chunks \u03b1\u03bd\u03ac 1 \u03b7\u03bc\u03ad\u03c1\u03b1<\/strong> (<code>INTERVAL &#039;1 day&#039;<\/code>) \u03bc\u03b5 \u03b2\u03ac\u03c3\u03b7 \u03c4\u03b7 \u03c3\u03c4\u03ae\u03bb\u03b7 <code>time<\/code>:<\/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 create_hypertable('sensor_data', by_range('time', INTERVAL '1 day'));<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03c2 \u03b5\u03b9\u03c3\u03ac\u03b3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03ce\u03c1\u03b1 100.000 \u03c4\u03c5\u03c7\u03b1\u03af\u03b5\u03c2 \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ad\u03c2 \u03bc\u03b5 \u03b5\u03cd\u03c1\u03bf\u03c2 \u03c4\u03b9\u03c2 \u03c4\u03b5\u03bb\u03b5\u03c5\u03c4\u03b1\u03af\u03b5\u03c2 10 \u03b7\u03bc\u03ad\u03c1\u03b5\u03c2 \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03b4\u03bf\u03ba\u03b9\u03bc\u03ac\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b7 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1 \u03c4\u03bf\u03c5:<\/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=\"\">INSERT INTO sensor_data (time, sensor_id, temperature, cpu_load)\nSELECT\n    NOW() - (random() * INTERVAL '10 days'),\n    (random() * 50)::INT,\n    20.0 + (random() * 15.0),\n    random() * 100.0\nFROM generate_series(1, 100000);<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a7\u03c9\u03c1\u03af\u03c2 \u03bd\u03b1 \u03c7\u03c1\u03b5\u03b9\u03b1\u03c3\u03c4\u03b5\u03af \u03bd\u03b1 \u03c6\u03c4\u03b9\u03ac\u03be\u03bf\u03c5\u03bc\u03b5 \u03ba\u03b1\u03bd\u03ad\u03bd\u03b1 partition \u03c7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03b1, \u03b7 TimescaleDB \u03b5\u03af\u03b4\u03b5 \u03c4\u03b1 timestamps \u03c4\u03c9\u03bd \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ce\u03bd \u03c0\u03bf\u03c5 \u03b2\u03ac\u03bb\u03b1\u03bc\u03b5 \u03ba\u03b1\u03b9 \u03b4\u03b7\u03bc\u03b9\u03bf\u03cd\u03c1\u03b3\u03b7\u03c3\u03b5 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1 \u03c4\u03b1 \u03b1\u03bd\u03c4\u03af\u03c3\u03c4\u03bf\u03b9\u03c7\u03b1 \u03b7\u03bc\u03b5\u03c1\u03ae\u03c3\u03b9\u03b1 Chunks. \u039c\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c4\u03b1 \u03b4\u03bf\u03cd\u03bc\u03b5 \u03b5\u03ba\u03c4\u03b5\u03bb\u03ce\u03bd\u03c4\u03b1\u03c2 \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 chunk_name, range_start, range_end, is_compressed \nFROM timescaledb_information.chunks \nWHERE hypertable_name = 'sensor_data'\nORDER BY range_start DESC;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1002\" height=\"672\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_02.png\" alt=\"\" class=\"wp-image-6251\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_02.png 1002w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_02-300x201.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_02-18x12.png 18w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_02-768x515.png 768w\" sizes=\"auto, (max-width: 1002px) 100vw, 1002px\" \/><figcaption class=\"wp-element-caption\">02<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0398\u03b1 \u03b4\u03bf\u03cd\u03bc\u03b5 \u03cc\u03c4\u03b9 \u03bf \u03c0\u03af\u03bd\u03b1\u03ba\u03b1\u03c2 \u03bc\u03b1\u03c2 \u03ad\u03c7\u03b5\u03b9 \u03ae\u03b4\u03b7 \u03c7\u03c9\u03c1\u03b9\u03c3\u03c4\u03b5\u03af \u03c3\u03b5 \u03b5\u03c0\u03b9\u03bc\u03ad\u03c1\u03bf\u03c5\u03c2 \u03b7\u03bc\u03b5\u03c1\u03ae\u03c3\u03b9\u03b1 \u03ba\u03bf\u03bc\u03bc\u03ac\u03c4\u03b9\u03b1 (chunks), \u03ba\u03ac\u03bd\u03bf\u03bd\u03c4\u03b1\u03c2 \u03c4\u03b1 \u03b5\u03c1\u03c9\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03c0\u03bf\u03c5 \u03c8\u03ac\u03c7\u03bd\u03bf\u03c5\u03bd \u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03b5\u03c2 \u03b7\u03bc\u03b5\u03c1\u03bf\u03bc\u03b7\u03bd\u03af\u03b5\u03c2 \u03b5\u03be\u03b1\u03b9\u03c1\u03b5\u03c4\u03b9\u03ba\u03ac \u03b3\u03c1\u03ae\u03b3\u03bf\u03c1\u03b1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0395\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03af\u03b7\u03c3\u03b7 Hypercore (Columnstore \/ Compression)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a3\u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 Time-Series, \u03c4\u03b1 \u03c0\u03c1\u03cc\u03c3\u03c6\u03b1\u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03b4\u03ad\u03c7\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c3\u03c5\u03bd\u03b5\u03c7\u03ce\u03c2 \u03bd\u03ad\u03b5\u03c2 \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ad\u03c2, \u03b1\u03bb\u03bb\u03ac \u03c4\u03b1 \u03c0\u03b1\u03bb\u03b1\u03b9\u03cc\u03c4\u03b5\u03c1\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 (\u03c0.\u03c7. \u03c0\u03c1\u03bf\u03b7\u03b3\u03bf\u03cd\u03bc\u03b5\u03bd\u03c9\u03bd \u03b7\u03bc\u03b5\u03c1\u03ce\u03bd \u03ae \u03bc\u03b7\u03bd\u03ce\u03bd) \u03c0\u03b1\u03c1\u03b1\u03bc\u03ad\u03bd\u03bf\u03c5\u03bd \u03c3\u03c4\u03b1\u03c4\u03b9\u03ba\u03ac \u03ba\u03b1\u03b9 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 \u03bc\u03cc\u03bd\u03bf \u03b3\u03b9\u03b1 \u03b1\u03bd\u03ac\u03b3\u03bd\u03c9\u03c3\u03b7 (reporting\/analytics).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u039c\u03ad\u03c3\u03c9 \u03c4\u03b7\u03c2 \u03b1\u03c1\u03c7\u03b9\u03c4\u03b5\u03ba\u03c4\u03bf\u03bd\u03b9\u03ba\u03ae\u03c2 <strong>Hypercore<\/strong> (Columnar Compression), \u03b7 TimescaleDB \u03bc\u03b1\u03c2 \u03b5\u03c0\u03b9\u03c4\u03c1\u03ad\u03c0\u03b5\u03b9 \u03bd\u03b1 \u03c3\u03c5\u03bc\u03c0\u03b9\u03ad\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b1 \u03c0\u03b1\u03bb\u03b9\u03ac Chunks \u03bc\u03b5\u03c4\u03b1\u03c4\u03c1\u03ad\u03c0\u03bf\u03bd\u03c4\u03ac\u03c2 \u03c4\u03b1 \u03b1\u03c0\u03cc row-based \u03b1\u03c0\u03bf\u03b8\u03ae\u03ba\u03b5\u03c5\u03c3\u03b7 \u03c3\u03b5 \u03b1\u03c0\u03bf\u03b8\u03ae\u03ba\u03b5\u03c5\u03c3\u03b7 \u03c3\u03c4\u03b7\u03bb\u03ce\u03bd (Columnstore).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03c1\u03c7\u03b9\u03ba\u03ac, \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03bf\u03cd\u03bc\u03b5 \u03c4\u03b7 \u03b4\u03c5\u03bd\u03b1\u03c4\u03cc\u03c4\u03b7\u03c4\u03b1 \u03c3\u03c5\u03bc\u03c0\u03af\u03b5\u03c3\u03b7\u03c2 \/ Columnstore \u03c0\u03ac\u03bd\u03c9 \u03c3\u03c4\u03bf Hypertable \u03bc\u03b1\u03c2, \u03bf\u03c1\u03af\u03b6\u03bf\u03bd\u03c4\u03b1\u03c2 \u03c0\u03ce\u03c2 \u03b8\u03b1 \u03bf\u03bc\u03b1\u03b4\u03bf\u03c0\u03bf\u03b9\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 (<code>compress_segmentby<\/code>) \u03ba\u03b1\u03b9 \u03c0\u03ce\u03c2 \u03b8\u03b1 \u03c4\u03b1\u03be\u03b9\u03bd\u03bf\u03bc\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 (<code>compress_orderby<\/code>) \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03bc\u03ad\u03c3\u03b1 \u03c3\u03c4\u03b1 \u03c3\u03c5\u03bc\u03c0\u03b9\u03b5\u03c3\u03bc\u03ad\u03bd\u03b1 chunks:<\/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 sensor_data SET (\n    timescaledb.compress,\n    timescaledb.compress_segmentby = 'sensor_id',\n    timescaledb.compress_orderby = 'time DESC'\n);<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u03a7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03b7 \u03a3\u03c5\u03bc\u03c0\u03af\u03b5\u03c3\u03b7 (Manual Compression)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03bd \u03b8\u03ad\u03bb\u03bf\u03c5\u03bc\u03b5 \u03bd\u03b1 \u03c3\u03c5\u03bc\u03c0\u03b9\u03ad\u03c3\u03bf\u03c5\u03bc\u03b5 \u03ac\u03bc\u03b5\u03c3\u03b1 (\u03c7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03b1) \u03cc\u03bb\u03b1 \u03c4\u03b1 Chunks \u03c0\u03bf\u03c5 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c0\u03b1\u03bb\u03b1\u03b9\u03cc\u03c4\u03b5\u03c1\u03b1 \u03b1\u03c0\u03cc 5 \u03b7\u03bc\u03ad\u03c1\u03b5\u03c2, \u03b5\u03ba\u03c4\u03b5\u03bb\u03bf\u03cd\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=\"\">SELECT compress_chunk(i) \nFROM show_chunks('sensor_data', older_than => INTERVAL '5 days') i;<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u0391\u03c5\u03c4\u03bf\u03bc\u03b1\u03c4\u03bf\u03c0\u03bf\u03b9\u03b7\u03bc\u03ad\u03bd\u03b7 \u03a3\u03c5\u03bc\u03c0\u03af\u03b5\u03c3\u03b7 (Compression Policy)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a3\u03c4\u03b7\u03bd \u03c0\u03c1\u03ac\u03be\u03b7, \u03b4\u03b5\u03bd \u03b8\u03ad\u03bb\u03bf\u03c5\u03bc\u03b5 \u03bd\u03b1 \u03c4\u03c1\u03ad\u03c7\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b7 \u03c3\u03c5\u03bc\u03c0\u03af\u03b5\u03c3\u03b7 \u03c7\u03b5\u03b9\u03c1\u03bf\u03ba\u03af\u03bd\u03b7\u03c4\u03b1. \u039c\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03bf\u03c1\u03af\u03c3\u03bf\u03c5\u03bc\u03b5 \u03ad\u03bd\u03b1 <strong>Compression Policy<\/strong>, \u03ce\u03c3\u03c4\u03b5 \u03b7 TimescaleDB \u03bd\u03b1 \u03c3\u03c5\u03bc\u03c0\u03b9\u03ad\u03b6\u03b5\u03b9 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1 \u03c3\u03c4\u03bf background \u03ba\u03ac\u03b8\u03b5 Chunk \u03bc\u03cc\u03bb\u03b9\u03c2 \u03b1\u03c5\u03c4\u03cc \u03be\u03b5\u03c0\u03b5\u03c1\u03ac\u03c3\u03b5\u03b9 \u03c4\u03b9\u03c2 5 \u03b7\u03bc\u03ad\u03c1\u03b5\u03c2 \u03b7\u03bb\u03b9\u03ba\u03af\u03b1\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=\"\">SELECT add_compression_policy('sensor_data', INTERVAL '5 days');<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0391\u03bd \u03b3\u03b9\u03b1 \u03bf\u03c0\u03bf\u03b9\u03bf\u03bd\u03b4\u03ae\u03c0\u03bf\u03c4\u03b5 \u03bb\u03cc\u03b3\u03bf \u03b8\u03ad\u03bb\u03bf\u03c5\u03bc\u03b5 \u03bd\u03b1 \u03b1\u03c6\u03b1\u03b9\u03c1\u03ad\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf policy \u03b1\u03c5\u03c4\u03bf\u03bc\u03b1\u03c4\u03bf\u03c0\u03bf\u03af\u03b7\u03c3\u03b7\u03c2, \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=\"\">SELECT remove_compression_policy('sensor_data');<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0393\u03b9\u03b1 \u03bd\u03b1 \u03b5\u03bb\u03ad\u03b3\u03be\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b1 \u03b5\u03bd\u03b5\u03c1\u03b3\u03ac background jobs \u03c3\u03c5\u03bc\u03c0\u03af\u03b5\u03c3\u03b7\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=\"\">SELECT * FROM timescaledb_information.jobs WHERE proc_name = 'policy_compression';<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"438\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_03-1024x438.png\" alt=\"\" class=\"wp-image-6252\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_03-1024x438.png 1024w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_03-766x328.png 766w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_03-18x8.png 18w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_03-300x128.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2026\/10\/dpts_03.png 1191w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">03<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0393\u03b9\u03b1 \u03bd\u03b1 \u03b4\u03bf\u03cd\u03bc\u03b5 \u03c0\u03cc\u03c3\u03bf \u03c7\u03ce\u03c1\u03bf \u03b5\u03be\u03bf\u03b9\u03ba\u03bf\u03bd\u03bf\u03bc\u03ae\u03c3\u03b1\u03bc\u03b5 \u03c0\u03c1\u03b9\u03bd \u03ba\u03b1\u03b9 \u03bc\u03b5\u03c4\u03ac \u03c4\u03b7 \u03c3\u03c5\u03bc\u03c0\u03af\u03b5\u03c3\u03b7, \u03b5\u03ba\u03c4\u03b5\u03bb\u03bf\u03cd\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=\"\">SELECT * FROM hypertable_compression_stats('sensor_data');<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a3\u03c4\u03b1 \u03b1\u03c0\u03bf\u03c4\u03b5\u03bb\u03ad\u03c3\u03bc\u03b1\u03c4\u03b1 <code>before_compression_total_bytes<\/code> vs. <code class=\"\">after_compression_total_bytes<\/code>, \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c0\u03b1\u03c1\u03b1\u03c4\u03b7\u03c1\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b7\u03bd  \u03bc\u03b5\u03af\u03c9\u03c3\u03b7 \u03c3\u03c4\u03bf \u03bc\u03ad\u03b3\u03b5\u03b8\u03bf\u03c2 \u03c0\u03bf\u03c5 \u03ba\u03b1\u03c4\u03b1\u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03bf\u03c5\u03bd \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03bc\u03b1\u03c2, \u03b5\u03bd\u03ce \u03c3\u03c5\u03bd\u03b5\u03c7\u03af\u03b6\u03bf\u03c5\u03bc\u03b5 \u03bd\u03b1 \u03ba\u03ac\u03bd\u03bf\u03c5\u03bc\u03b5 \u03ba\u03b1\u03bd\u03bf\u03bd\u03b9\u03ba\u03ac <code>SELECT<\/code> on the table <code>sensor_data<\/code> \u03c7\u03c9\u03c1\u03af\u03c2 \u03bd\u03b1 \u03b1\u03bb\u03bb\u03ac\u03be\u03bf\u03c5\u03bc\u03b5 \u03b1\u03c0\u03bf\u03bb\u03cd\u03c4\u03c9\u03c2 \u03c4\u03af\u03c0\u03bf\u03c4\u03b1 \u03c3\u03c4\u03bf\u03bd \u03ba\u03ce\u03b4\u03b9\u03ba\u03b1 \u03c4\u03b7\u03c2 \u03b5\u03c6\u03b1\u03c1\u03bc\u03bf\u03b3\u03ae\u03c2 \u03bc\u03b1\u03c2!<\/p>\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\/\">PostgreSQL 18.4 Documentation<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.tigerdata.com\/docs\/deploy\/self-hosted\" data-type=\"link\" data-id=\"https:\/\/www.tigerdata.com\/docs\/get-started\/choose-your-path\/install-timescaledb\">TimescaleDB Documentation<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.tigerdata.com\/docs\/learn\/hypertables\/understand-hypertables\" data-type=\"link\" data-id=\"https:\/\/www.tigerdata.com\/docs\/learn\/hypertables\/understand-hypertables\">Understand hypertables<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.tigerdata.com\/docs\/learn\/columnar-storage\/understand-hypercore\" data-type=\"link\" data-id=\"https:\/\/www.tigerdata.com\/docs\/learn\/columnar-storage\/understand-hypercore\">Understand hypercore<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>\u03a3\u03c4\u03b1 \u03c3\u03cd\u03b3\u03c7\u03c1\u03bf\u03bd\u03b1 \u03c0\u03b5\u03c1\u03b9\u03b2\u03ac\u03bb\u03bb\u03bf\u03bd\u03c4\u03b1 \u03b2\u03ac\u03c3\u03b5\u03c9\u03bd \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd, \u03cc\u03bb\u03bf \u03ba\u03b1\u03b9 \u03c0\u03b9\u03bf \u03c3\u03c5\u03c7\u03bd\u03ac \u03ba\u03b1\u03bb\u03bf\u03cd\u03bc\u03b1\u03c3\u03c4\u03b5 \u03bd\u03b1 \u03b1\u03c0\u03bf\u03b8\u03b7\u03ba\u03b5\u03cd\u03c3\u03bf\u03c5\u03bc\u03b5 \u03ba\u03b1\u03b9 \u03bd\u03b1 \u03b1\u03bd\u03b1\u03bb\u03cd\u03c3\u03bf\u03c5\u03bc\u03b5 Time-Series \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1. \u03a4\u03ad\u03c4\u03bf\u03b9\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b3\u03b9\u03b1 \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1 \u03bf\u03b9 \u03bc\u03b5\u03c4\u03c1\u03ae\u03c3\u03b5\u03b9\u03c2 \u03b1\u03c0\u03cc \u03b1\u03b9\u03c3\u03b8\u03b7\u03c4\u03ae\u03c1\u03b5\u03c2 (IoT), \u03c4\u03b1 metrics \u03c0\u03b1\u03c1\u03b1\u03ba\u03bf\u03bb\u03bf\u03cd\u03b8\u03b7\u03c3\u03b7\u03c2 \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd (CPU, RAM), \u03c4\u03b1 logs \u03b5\u03c6\u03b1\u03c1\u03bc\u03bf\u03b3\u03ce\u03bd \u03ae \u03bf\u03b9 \u03bf\u03b9\u03ba\u03bf\u03bd\u03bf\u03bc\u03b9\u03ba\u03ad\u03c2 \u03c3\u03c5\u03bd\u03b1\u03bb\u03bb\u03b1\u03b3\u03ad\u03c2, \u03cc\u03c0\u03bf\u03c5 \u03ba\u03ac\u03b8\u03b5 \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ae \u03c3\u03c5\u03bd\u03bf\u03b4\u03b5\u03cd\u03b5\u03c4\u03b1\u03b9 \u03b1\u03c0\u03cc \u03ad\u03bd\u03b1 timestamp. \u038c\u03c4\u03b1\u03bd \u03b1\u03c5\u03c4\u03ac \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03c6\u03c4\u03ac\u03c3\u03bf\u03c5\u03bd \u03c3\u03b5 \u03b4\u03b9\u03c3\u03b5\u03ba\u03b1\u03c4\u03bf\u03bc\u03bc\u03cd\u03c1\u03b9\u03b1 \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ad\u03c2, [&hellip;]<\/p>","protected":false},"author":1,"featured_media":6249,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,123],"tags":[29,48,124,30,499,498],"class_list":["post-6248","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-databases","category-postgresql","tag-databases","tag-performance_tuning","tag-postgresql","tag-rdbms","tag-tigerdata","tag-timescaledb"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u03a4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b7 TimescaleDB (Tiger Data) \u03ba\u03b1\u03b9 \u03c0\u03ce\u03c2 \u03b4\u03b9\u03b1\u03c7\u03b5\u03b9\u03c1\u03b9\u03b6\u03cc\u03bc\u03b1\u03c3\u03c4\u03b5 Time-Series \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03c3\u03c4\u03b7 PostgreSQL - DataPlatform.gr<\/title>\n<meta name=\"robots\" content=\"index, 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