|| apoc.warmup.run - APOC 核心文档 - Neo4j 文档

apoc.warmup.run

此过程不被认为可在多线程环境下安全运行。因此，并行运行时（在 Neo4j 5.13 中引入）不支持此功能。更多信息，请参阅Cypher 手册 → 并行运行时。

详情
语法	apoc.warmup.run([ loadProperties, loadDynamicProperties, loadIndexes ]) :: (pageSize, totalTime, transactionWasTerminated, nodesPerPage, nodesTotal, nodePages, nodesTime, relsPerPage, relsTotal, relPages, relsTime, relGroupsPerPage, relGroupsTotal, relGroupPages, relGroupsTime, propertiesLoaded, dynamicPropertiesLoaded, propsPerPage, propRecordsTotal, propPages, propsTime, stringPropsPerPage, stringPropRecordsTotal, stringPropPages, stringPropsTime, arrayPropsPerPage, arrayPropRecordsTotal, arrayPropPages, arrayPropsTime, indexesLoaded, indexPages, indexTime)
描述	将数据库中的所有 `NODE` 和 `RELATIONSHIP` 值加载到内存中。
输入参数	名称	类型	描述
	`loadProperties`	`布尔值`	loadProperties = false :: BOOLEAN 默认值为：`false`。
	`loadDynamicProperties`	`布尔值`	loadDynamicProperties = false :: BOOLEAN 默认值为：`false`。
	`loadIndexes`	`布尔值`	loadIndexes = false :: BOOLEAN 默认值为：`false`。
返回参数	名称	类型	描述
	`pageSize`	`整数`	pageSize :: INTEGER
	`totalTime`	`整数`	totalTime :: INTEGER
	`transactionWasTerminated`	`布尔值`	transactionWasTerminated :: BOOLEAN
	`nodesPerPage`	`整数`	nodesPerPage :: INTEGER
	`nodesTotal`	`整数`	nodesTotal :: INTEGER
	`nodePages`	`整数`	nodePages :: INTEGER
	`nodesTime`	`整数`	nodesTime :: INTEGER
	`relsPerPage`	`整数`	relsPerPage :: INTEGER
	`relsTotal`	`整数`	relsTotal :: INTEGER
	`relPages`	`整数`	relPages :: INTEGER
	`relsTime`	`整数`	relsTime :: INTEGER
	`relGroupsPerPage`	`整数`	relGroupsPerPage :: INTEGER
	`relGroupsTotal`	`整数`	relGroupsTotal :: INTEGER
	`relGroupPages`	`整数`	relGroupPages :: INTEGER
	`relGroupsTime`	`整数`	relGroupsTime :: INTEGER
	`propertiesLoaded`	`布尔值`	propertiesLoaded :: BOOLEAN
	`dynamicPropertiesLoaded`	`布尔值`	dynamicPropertiesLoaded :: BOOLEAN
	`propsPerPage`	`整数`	propsPerPage :: INTEGER
	`propRecordsTotal`	`整数`	propRecordsTotal :: INTEGER
	`propPages`	`整数`	propPages :: INTEGER
	`propsTime`	`整数`	propsTime :: INTEGER
	`stringPropsPerPage`	`整数`	stringPropsPerPage :: INTEGER
	`stringPropRecordsTotal`	`整数`	stringPropRecordsTotal :: INTEGER
	`stringPropPages`	`整数`	stringPropPages :: INTEGER
	`stringPropsTime`	`整数`	stringPropsTime :: INTEGER
	`arrayPropsPerPage`	`整数`	arrayPropsPerPage :: INTEGER
	`arrayPropRecordsTotal`	`整数`	arrayPropRecordsTotal :: INTEGER
	`arrayPropPages`	`整数`	arrayPropPages :: INTEGER
	`arrayPropsTime`	`整数`	arrayPropsTime :: INTEGER
	`indexesLoaded`	`布尔值`	indexesLoaded :: BOOLEAN
	`indexPages`	`整数`	indexPages :: INTEGER
	`indexTime`	`整数`	indexTime :: INTEGER

使用示例

本节示例基于以下示例图

MERGE (michael:Person {name: "Michael"})
WITH michael
CALL {
    WITH michael
    UNWIND range(0, 10000) AS id
    MERGE (p:Person {name: "Person" + id})
    MERGE (michael)-[:KNOWS]-(p)
    RETURN count(*) AS friends
}
RETURN friends;

结果
friends
10001

CALL apoc.warmup.run()
YIELD nodesTotal, nodePages, relsTotal, relPages, propPages, propertiesLoaded
RETURN nodesTotal, nodePages, relsTotal, relPages, propPages, propertiesLoaded;

结果
nodesTotal	nodePages	relsTotal	relPages	propPages	propertiesLoaded
10002	184	10001	417	503	假

CALL apoc.warmup.run(true, true, false)
YIELD nodesTotal, nodePages, relsTotal, relPages, propPages, propertiesLoaded
RETURN nodesTotal, nodePages, relsTotal, relPages, propPages, propertiesLoaded;

结果
nodesTotal	nodePages	relsTotal	relPages	propPages	propertiesLoaded
10002	184	10001	417	503	真

此过程仅适用于数据库记录格式为 standard、aligned 或 high_limit。记录格式通过 Neo4j 配置设置 db.format 进行设置。