ClickHouse/docs/en/engines/database-engines/lazy.md

---
toc_priority: 31
toc_title: Lazy
---

# Lazy {#lazy}

Keeps tables in RAM only `expiration_time_in_seconds` seconds after last access. Can be used only with \*Log tables.

It’s optimized for storing many small \*Log tables, for which there is a long time interval between accesses.

## Creating a Database {#creating-a-database}

    CREATE DATABASE testlazy ENGINE = Lazy(expiration_time_in_seconds);

[Original article](https://clickhouse.com/docs/en/database_engines/lazy/) <!--hide-->
-												Get rid of toc_en.yml (#10023)


											
										
										
											2020-04-03 13:23:32 +00:00
+								---
 								toc_priority: 31
 								toc_title: Lazy
 								---
-												Normalization for en markdown (#9763)


											
										
										
											2020-03-20 10:10:48 +00:00
+								# Lazy {#lazy}
-												docs

											
										
										
											2019-10-08 08:31:12 +00:00
-												Update lazy.md
											
										
										
											2020-02-03 15:12:03 +00:00
+								Keeps tables in RAM only `expiration_time_in_seconds` seconds after last access. Can be used only with \*Log tables.
-												docs

											
										
										
											2019-10-08 08:31:12 +00:00
-												Normalization for en markdown (#9763)


											
										
										
											2020-03-20 10:10:48 +00:00
+								It’s optimized for storing many small \*Log tables, for which there is a long time interval between accesses.
-												docs

											
										
										
											2019-10-08 08:31:12 +00:00
-												Normalization for en markdown (#9763)


											
										
										
											2020-03-20 10:10:48 +00:00
+								## Creating a Database {#creating-a-database}
-												docs

											
										
										
											2019-10-08 08:31:12 +00:00
-												[experimental] add "es" docs language as machine translated draft (#9787)

* replace exit with assert in test_single_page

* improve save_raw_single_page docs option

* More grammar fixes

* "Built from" link in new tab

* fix mistype

* Example of include in docs

* add anchor to meeting form

* Draft of translation helper

* WIP on translation helper

* Replace some fa docs content with machine translation

* add normalize-en-markdown.sh

* normalize some en markdown

* normalize some en markdown

* admonition support

* normalize

* normalize

* normalize

* support wide tables

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* lightly edited machine translation of introdpection.md

* lightly edited machhine translation of lazy.md

* WIP on translation utils

* Normalize ru docs

* Normalize other languages

* some fixes

* WIP on normalize/translate tools

* add requirements.txt

* [experimental] add es docs language as machine translated draft

* remove duplicate script

* Back to wider tab-stop (narrow renders not so well)
											
										
										
											2020-03-21 04:11:51 +00:00
+								    CREATE DATABASE testlazy ENGINE = Lazy(expiration_time_in_seconds);
-												fix

											
										
										
											2019-10-09 19:19:50 +00:00
-												find . -type f -name '*.md'| xargs -I{} perl -pi -e 's|https://clickhouse.tech|https://clickhouse.com|g' {}

											
										
										
											2021-09-19 20:05:54 +00:00
+								[Original article](https://clickhouse.com/docs/en/database_engines/lazy/) <!--hide-->