Um Identificador Universalmente Único (UUID) é um valor de 16 bytes usado para identificar registros. Para informações detalhadas sobre UUIDs, consulte a Wikipedia.Embora existam diferentes variantes de UUID, por exemplo, UUIDv4 e UUIDv7 (veja RFC 9562), o ClickHouse não valida se os UUIDs inseridos estão em conformidade com alguma variante específica.
Internamente, os UUIDs são tratados como uma sequência de 16 bytes aleatórios, com representação 8-4-4-4-12 no nível SQL.Exemplo de valor UUID:
61f0c404-5cb3-11e7-907b-a6006ad3dba0
O UUID padrão é composto só por zeros. Ele é usado, por exemplo, quando um novo registro é inserido, mas nenhum valor é especificado para uma coluna UUID:
00000000-0000-0000-0000-000000000000
Por motivos históricos, os UUIDs são ordenados pela segunda metade.Embora isso seja aceitável para valores UUIDv4, pode prejudicar o desempenho de colunas UUIDv7 usadas em definições de índice primário (o uso em chaves de ordenação ou de partição não é um problema).
Mais especificamente, os valores UUIDv7 consistem em um timestamp na primeira metade e um contador na segunda metade.
Assim, a ordenação de UUIDv7 em índices primários esparsos (isto é, os primeiros valores de cada grânulo de índice) será pelo campo do contador.
Supondo que os UUIDs fossem ordenados pela primeira metade (timestamp), espera-se que a etapa de análise do índice primário no início das consultas descarte todas as marcas em todas as partes, exceto uma.
No entanto, com a ordenação pela segunda metade (contador), espera-se que pelo menos uma marca seja retornada para todas as partes, levando a acessos desnecessários ao disco.
Exemplo:
Query
CREATE TABLE tab (uuid UUID) ENGINE = MergeTree PRIMARY KEY (uuid);INSERT INTO tab SELECT generateUUIDv7() FROM numbers(2);INSERT INTO tab SELECT generateUUIDv7() FROM numbers(2);INSERT INTO tab SELECT generateUUIDv7() FROM numbers(2);INSERT INTO tab SELECT generateUUIDv7() FROM numbers(2);INSERT INTO tab SELECT generateUUIDv7() FROM numbers(2);SELECT * FROM tab;
Como solução alternativa, o UUID pode ser convertido em um timestamp extraído da segunda metade:
Query
CREATE TABLE tab (uuid UUID) ENGINE = MergeTree PRIMARY KEY (UUIDv7ToDateTime(uuid));-- Or alternatively: [...] PRIMARY KEY (toStartOfHour(UUIDv7ToDateTime(uuid)));INSERT INTO tab SELECT generateUUIDv7() FROM numbers(2);INSERT INTO tab SELECT generateUUIDv7() FROM numbers(2);INSERT INTO tab SELECT generateUUIDv7() FROM numbers(2);INSERT INTO tab SELECT generateUUIDv7() FROM numbers(2);INSERT INTO tab SELECT generateUUIDv7() FROM numbers(2);SELECT * FROM tab;
Resultado (supondo que os mesmos dados sejam inseridos):
O tipo de dado UUID suporta apenas as funções que também são compatíveis com o tipo de dado String (por exemplo, min, max e count).O tipo de dado UUID não oferece suporte a operações aritméticas (por exemplo, abs) nem a funções de agregação, como sum e avg.
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ClickHouse","sidebarTitle":"UUID","slug":"/sql-reference/data-types/uuid","title":"UUID","doc_type":"reference","href":"/pt-BR/reference/data-types/uuid"},"description":{"compiledSource":"\"use strict\";\nconst {jsx: _jsx} = arguments[0];\nconst {useMDXComponents: _provideComponents} = arguments[0];\nfunction _createMdxContent(props) {\n const _components = {\n p: \"p\",\n ..._provideComponents(),\n ...props.components\n };\n return _jsx(_components.p, {\n children: \"Documentação do tipo de dado UUID no ClickHouse\"\n });\n}\nfunction MDXContent(props = {}) {\n const {wrapper: MDXLayout} = {\n ..._provideComponents(),\n ...props.components\n };\n return MDXLayout ? _jsx(MDXLayout, {\n ...props,\n children: _jsx(_createMdxContent, {\n ...props\n })\n }) : _createMdxContent(props);\n}\nreturn {\n default: MDXContent\n};\n","frontmatter":{},"scope":{}},"pageType":"default","mdx":{"mdxSource":{"compiledSource":"\"use strict\";const{Fragment:_Fragment,jsx:_jsx,jsxs:_jsxs}=arguments[0];const{useMDXComponents:_provideComponents}=arguments[0];function _createMdxContent(props){const _components={a:`a`,code:`code`,p:`p`,pre:`pre`,span:`span`,strong:`strong`,..._provideComponents(),...props.components},{CodeBlock,Heading,Warning}=_components;if(!CodeBlock)_missingMdxReference(`CodeBlock`,true);if(!Heading)_missingMdxReference(`Heading`,true);if(!Warning)_missingMdxReference(`Warning`,true);return _jsxs(_Fragment,{children:[_jsxs(_components.p,{children:[`Um Identificador Universalmente Único (UUID) é um valor de 16 bytes usado para identificar registros. Para informações detalhadas sobre UUIDs, consulte a `,_jsx(_components.a,{href:`https://en.wikipedia.org/wiki/Universally_unique_identifier`,children:`Wikipedia`}),`.`]}),`\n`,_jsxs(_components.p,{children:[`Embora existam diferentes variantes de UUID, por exemplo, UUIDv4 e UUIDv7 (veja `,_jsx(_components.a,{href:`https://www.rfc-editor.org/rfc/rfc9562`,children:`RFC 9562`}),`), o ClickHouse não valida se os UUIDs inseridos estão em conformidade com alguma variante específica.\nInternamente, os UUIDs são tratados como uma sequência de 16 bytes aleatórios, com representação `,_jsx(_components.a,{href:`https://en.wikipedia.org/wiki/Universally_unique_identifier#Textual_representation`,children:`8-4-4-4-12`}),` no nível SQL.`]}),`\n`,_jsx(_components.p,{children:`Exemplo de valor UUID:`}),`\n`,_jsx(CodeBlock,{filename:``,numberOfLines:`2`,language:`text`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`text`,children:_jsxs(_components.code,{language:`text`,numberOfLines:`2`,children:[_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`61f0c404-5cb3-11e7-907b-a6006ad3dba0`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{})})]})})}),`\n`,_jsx(_components.p,{children:`O UUID padrão é composto só por zeros. 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dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`text`,children:_jsxs(_components.code,{language:`text`,numberOfLines:`14`,children:[_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`┌─uuid─────────────────────────────────┐`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 019d2555-7868-7333-89d1-2bd1639899c3 │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 019d2555-7868-7333-89d1-2bd297eb7d42 │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 019d2555-786c-73e9-a031-4a7936df7d56 │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 019d2555-786c-73e9-a031-4a7a35a9544f │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 019d2555-7870-7432-ba62-5250ac595328 │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 019d2555-7870-7432-ba62-5251da22bd19 │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 019d2555-7874-7e9d-a284-9b45a0b2f165 │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 019d2555-7874-7e9d-a284-9b46c3353be7 │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 019d2555-7878-77fc-a36f-4081aa58ec2b │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 019d2555-7878-77fc-a36f-40826555fb9b │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`└──────────────────────────────────────┘`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{})})]})})}),`\n`,_jsx(_components.p,{children:`ORDER BY (UUIDv7ToDateTime(uuid), uuid)`}),`\n`,_jsx(`div`,{id:`generating-uuids`,children:_jsx(Heading,{level:`2`,id:`gerando-uuids`,children:`Gerando UUIDs`})}),`\n`,_jsxs(_components.p,{children:[`O ClickHouse fornece a função `,_jsx(_components.a,{href:`/pt-BR/reference/functions/regular-functions/uuid-functions`,children:`generateUUIDv4`}),` para gerar UUIDs aleatórios da versão 4.`]}),`\n`,_jsx(`div`,{id:`usage-example`,children:_jsx(Heading,{level:`2`,id:`exemplo-de-uso`,children:`Exemplo de uso`})}),`\n`,_jsx(_components.p,{children:_jsx(_components.strong,{children:`Exemplo 1`})}),`\n`,_jsx(_components.p,{children:`Este exemplo demonstra a criação de uma tabela com uma coluna UUID e a inserção de um valor na tabela.`}),`\n`,_jsx(CodeBlock,{filename:`Query`,numberOfLines:`5`,language:`sql`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`sql`,children:_jsxs(_components.code,{language:`sql`,numberOfLines:`5`,children:[_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`CREATE`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:` TABLE`}),_jsx(_components.span,{style:{color:`#8250DF`,\"--shiki-dark\":`#DCDCAA`},children:` t_uuid`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` (x UUID, y String) ENGINE`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D4D4D4`},children:`=`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`TinyLog`})]}),`\n`,_jsx(_components.span,{className:`line`}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`INSERT INTO`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` t_uuid `}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`SELECT`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` generateUUIDv4(), `}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:`'Example 1'`})]}),`\n`,_jsx(_components.span,{className:`line`}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`SELECT`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D4D4D4`},children:` *`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:` FROM`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` t_uuid`})]}),`\n`]})})}),`\n`,_jsx(CodeBlock,{filename:`Response`,numberOfLines:`4`,language:`text`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`text`,children:_jsxs(_components.code,{language:`text`,numberOfLines:`4`,children:[_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`┌────────────────────────────────────x─┬─y─────────┐`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 417ddc5d-e556-4d27-95dd-a34d84e46a50 │ Example 1 │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`└──────────────────────────────────────┴───────────┘`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{})})]})})}),`\n`,_jsx(_components.p,{children:_jsx(_components.strong,{children:`Exemplo 2`})}),`\n`,_jsx(_components.p,{children:`Neste exemplo, nenhum valor é especificado para a coluna UUID quando o registro é inserido, ou seja, o valor UUID padrão é inserido:`}),`\n`,_jsx(CodeBlock,{filename:``,numberOfLines:`3`,language:`sql`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`sql`,children:_jsxs(_components.code,{language:`sql`,numberOfLines:`3`,children:[_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`INSERT INTO`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` t_uuid (y) `}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`VALUES`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` (`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:`'Example 2'`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`)`})]}),`\n`,_jsx(_components.span,{className:`line`}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`SELECT`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D4D4D4`},children:` *`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:` FROM`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` t_uuid`})]}),`\n`]})})}),`\n`,_jsx(CodeBlock,{filename:``,numberOfLines:`5`,language:`text`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`text`,children:_jsxs(_components.code,{language:`text`,numberOfLines:`5`,children:[_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`┌────────────────────────────────────x─┬─y─────────┐`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 417ddc5d-e556-4d27-95dd-a34d84e46a50 │ Example 1 │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`│ 00000000-0000-0000-0000-000000000000 │ Example 2 │`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{children:`└──────────────────────────────────────┴───────────┘`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{})})]})})}),`\n`,_jsx(`div`,{id:`restrictions`,children:_jsx(Heading,{level:`2`,id:`restrições`,children:`Restrições`})}),`\n`,_jsxs(_components.p,{children:[`O tipo de dado UUID suporta apenas as funções que também são compatíveis com o tipo de dado `,_jsx(_components.a,{href:`/pt-BR/reference/data-types/string`,children:`String`}),` (por exemplo, `,_jsx(_components.a,{href:`/pt-BR/reference/functions/aggregate-functions/min`,children:`min`}),`, `,_jsx(_components.a,{href:`/pt-BR/reference/functions/aggregate-functions/max`,children:`max`}),` e `,_jsx(_components.a,{href:`/pt-BR/reference/functions/aggregate-functions/count`,children:`count`}),`).`]}),`\n`,_jsxs(_components.p,{children:[`O tipo de dado UUID não oferece suporte a operações aritméticas (por exemplo, `,_jsx(_components.a,{href:`/pt-BR/reference/functions/regular-functions/arithmetic-functions#abs`,children:`abs`}),`) nem a funções de agregação, como `,_jsx(_components.a,{href:`/pt-BR/reference/functions/aggregate-functions/sum`,children:`sum`}),` e `,_jsx(_components.a,{href:`/pt-BR/reference/functions/aggregate-functions/avg`,children:`avg`}),`.`]})]})}function MDXContent(props={}){const{wrapper:MDXLayout}={..._provideComponents(),...props.components};return MDXLayout?_jsx(MDXLayout,{...props,children:_jsx(_createMdxContent,{...props})}):_createMdxContent(props)}return{default:MDXContent};function _missingMdxReference(id,component){throw new Error(`Expected `+(component?`component`:`object`)+\" `\"+id+\"` to be defined: you likely forgot to import, pass, or provide it.\")}","frontmatter":{},"scope":{"config":{},"pageMetadata":{"description":"Documentação do tipo de dado UUID no 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