in memory json database

This problem is actually a matter of space and time. As you can imagine, if you store all URLs in the memory, the memory will soon be fully occupied. However, if a file exists, you must operate the file each time you read or add it. This performance consumption is relatively large. Therefore, we can quickly think of the reason why cache appears on the computer. My design philosophy is to create three levels

How can we optimize the memory usage of oracle? For the convenience of development, we want to reduce the memory occupied by oracle at ordinary times. The following describes how to reduce memory usage by adjusting oracle memory parameters. Solution: sqlplus“/assysdba" createpfile='d:/cj.ora'fromspfile; G

Note: This article source: Small yan Kevin "Oracle Database Memory adjustment increased memory "Simulated operating system memory increased from 2G to 8G, adjust the database memory parameters, the example parameter is not as the

(' #{time.strftime ('%f%x ')} '); ") .fetch_row puts "#{h[' host ']}#{item[' itemid ']}#{item[' name ']}#{total} ' endifitem[' name ']=~/available memory/ free=db.query ("Selectmin (Value_max) fromtrends_uintwhereitemid= ' #{item[' itemid '} ' andclock> unix_timestamp (' #{time.strftime ('%f%x ')} '); ") .fetch_row puts "#{h[' host ']}#{item[' itemid ']}#{item[' name ']}#{free} ' endend iffree!=0usage=free.to_s.to_f/total.to _s.to_f*100puts "#{h['

This article teaches you how to store the JSON content that you configure under the project in the MongoDB database when the project is started.As we all know, Spring Boo Project T is started with a main function. So we want to be able to do something at the start (that is, listen for startup events). By looking at the Spring Boot document (http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/h

PHP database read JSON and write database Has anyone written PHP database to export JSON and import database out of the box what I just learned from PHP is very messy. Just read it from the table. Test corresponding table other

Tags: Official document ble independent data compression span introduction Hash table first time neededThe hottest topic in the database industry this week is memsql, whether "old bottles of new wine" has sparked a lot of debate, and has raised questions about whether product technology is important or DBA. There are some introductions to memsql on the web, mostly from official documents. In this article, Curt Monash, a well-known independent analyst

Has anyone written PHP database to export JSON and import database out of the box what I just learned from PHP is very messy. Just read it from the table. Test corresponding table other corresponding fields Output JSON {"Test": [{"F1": "abc", "F2": 123, "BZX": false}]} JSON