{"id":5162,"date":"2015-06-15T12:50:51","date_gmt":"2015-06-15T10:50:51","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/what-is-more-efficient-arrays-or-single-columns-values-oracle\/"},"modified":"2015-06-15T12:50:51","modified_gmt":"2015-06-15T10:50:51","slug":"what-is-more-efficient-arrays-or-single-columns-values-oracle","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/what-is-more-efficient-arrays-or-single-columns-values-oracle\/","title":{"rendered":"What is more efficient: arrays or single columns values? – oracle"},"content":{"rendered":"

In the last post<\/a> on this topic it turned out that using an array as a column type needs more space than using a column per value in PostgreSQL. Now I’ll do the same test case in Oracle.
\n\"Read
\nAs with the PostgreSQL test case I’ll create two test tables in Oracle: One using 10 columns and one just using one column of type varray:<\/p>\n

SQL> create table single_values ( a number, b number, c number, d number, e number, f number, g number, h number, i number, j number );\n\nTable created.\n\nSQL> create type typ_num_arr as varray(10) of number;\n  2  \/\n\nType created.\n\nSQL> create table arr_values ( a typ_num_arr );\n\nTable created.\n\n<\/pre>\n
The same logic will be used to populate the tables:<\/p>\n
set timi on\ntruncate table single_values;\ndeclare\n  ln number := 1000;\nbegin\n  for i in 0..1e6\n  loop\n    insert into single_values (a,b,c,d,e,f,g,h,i,j)\n           values (ln,ln,ln,ln,ln,ln,ln,ln,ln,ln);\n  end loop;\nend;\n\/\ncommit;\n\nTable truncated.\n\nElapsed: 00:00:00.07\n\nPL\/SQL procedure successfully completed.\n\nElapsed: 00:00:29.56\n\nCommit complete.\n\nElapsed: 00:00:00.00\nSQL> \n<\/pre>\n
For the table using the varray:<\/p>\n
set timi on\ntruncate table arr_values;\ndeclare\n  ln number := 1000;\n  lt typ_num_arr := typ_num_arr(ln,ln,ln,ln,ln,ln,ln,ln,ln,ln);\nbegin\n  for i in 0..1e6\n  loop\n    insert into arr_values (a)\n           values (lt); \n  end loop;\nend;\n\/\ncommit;\n\nTable truncated.\n\nElapsed: 00:00:00.01\n\nPL\/SQL procedure successfully completed.\n\nElapsed: 00:00:33.05\n\nCommit complete.\n\nElapsed: 00:00:00.01\n\n<\/pre>\n
Now, what about the space the two tables have allocated:<\/p>\n
SQL> select sum(bytes)\/1024\/1024 MB from dba_extents where SEGMENT_NAME = 'SINGLE_VALUES';\n\n\tMB\n----------\n\t38\n\nElapsed: 00:00:00.23\nSQL> select sum(bytes)\/1024\/1024 MB from dba_extents where SEGMENT_NAME = 'ARR_VALUES';\n\n\tMB\n----------\n\t47\n\nElapsed: 00:00:00.20\nSQL> \n\n<\/pre>\n
The same behavior as in PostgreSQL. The table with the varray needs more space than the table with the columns per value.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the last post on this topic it turned out that using an array as a column type needs more space than using a column per value in PostgreSQL. Now I’ll do the same test case in Oracle. As with the PostgreSQL test case I’ll create two test tables in Oracle: One using 10 columns […]<\/p>\n","protected":false},"author":29,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229],"tags":[96],"type_dbi":[],"class_list":["post-5162","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","tag-oracle"],"acf":[],"yoast_head":"\nWhat is more efficient: arrays or single columns values? - oracle - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/what-is-more-efficient-arrays-or-single-columns-values-oracle\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is more efficient: arrays or single columns values? - oracle\" \/>\n<meta property=\"og:description\" content=\"In the last post on this topic it turned out that using an array as a column type needs more space than using a column per value in PostgreSQL. Now I’ll do the same test case in Oracle. As with the PostgreSQL test case I’ll create two test tables in Oracle: One using 10 columns […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/what-is-more-efficient-arrays-or-single-columns-values-oracle\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2015-06-15T10:50:51+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/wwwold.dbi-services.com\/plugins\/editors\/jce\/tiny_mce\/plugins\/article\/img\/trans.gif\" \/>\n<meta name=\"author\" content=\"Daniel Westermann\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@westermanndanie\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Daniel Westermann\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/what-is-more-efficient-arrays-or-single-columns-values-oracle\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/what-is-more-efficient-arrays-or-single-columns-values-oracle\/\"},\"author\":{\"name\":\"Daniel Westermann\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66\"},\"headline\":\"What is more efficient: arrays or single columns values? 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He has more than 15 years of experience in management, engineering and optimization of databases and infrastructures, especially on Oracle and PostgreSQL. Since the beginning of his career, he has specialized in Oracle Technologies and is Oracle Certified Professional 12c and Oracle Certified Expert RAC\/GridInfra. Over time, Daniel has become increasingly interested in open source technologies, becoming \u201cTechnology Leader Open Infrastructure\u201d and PostgreSQL expert. \u00a0Based on community or EnterpriseDB tools, he develops and installs complex high available solutions with PostgreSQL. He is also a certified PostgreSQL Plus 9.0 Professional and a Postgres Advanced Server 9.4 Professional. He is a regular speaker at PostgreSQL conferences in Switzerland and Europe. Today Daniel is also supporting our customers on AWS services such as AWS RDS, database migrations into the cloud, EC2 and automated infrastructure management with AWS SSM (System Manager). He is a certified AWS Solutions Architect Professional. Prior to dbi services, Daniel was Management System Engineer at LC SYSTEMS-Engineering AG in Basel. Before that, he worked as Oracle Developper &\u00a0Project Manager at Delta Energy Solutions AG in Basel (today Powel AG). Daniel holds a diploma in Business Informatics (DHBW, Germany). His branch-related experience mainly covers the pharma industry, the financial sector, energy, lottery and telecommunications.\",\"sameAs\":[\"https:\/\/x.com\/westermanndanie\"],\"url\":\"https:\/\/www.dbi-services.com\/blog\/author\/daniel-westermann\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"What is more efficient: arrays or single columns values? - oracle - dbi Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.dbi-services.com\/blog\/what-is-more-efficient-arrays-or-single-columns-values-oracle\/","og_locale":"en_US","og_type":"article","og_title":"What is more efficient: arrays or single columns values? - oracle","og_description":"In the last post on this topic it turned out that using an array as a column type needs more space than using a column per value in PostgreSQL. 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He is a certified AWS Solutions Architect Professional. Prior to dbi services, Daniel was Management System Engineer at LC SYSTEMS-Engineering AG in Basel. Before that, he worked as Oracle Developper &\u00a0Project Manager at Delta Energy Solutions AG in Basel (today Powel AG). Daniel holds a diploma in Business Informatics (DHBW, Germany). His branch-related experience mainly covers the pharma industry, the financial sector, energy, lottery and telecommunications.","sameAs":["https:\/\/x.com\/westermanndanie"],"url":"https:\/\/www.dbi-services.com\/blog\/author\/daniel-westermann\/"}]}},"_links":{"self":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/5162","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/users\/29"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/comments?post=5162"}],"version-history":[{"count":0,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/5162\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/media?parent=5162"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/categories?post=5162"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/tags?post=5162"},{"taxonomy":"type","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/type_dbi?post=5162"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}