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第四章：线程安全问题
学习目标 1. 什么是线程安全 1.1 线程安全的定义 1.2 线程安全的重要性 2. 共享资源访问的竞态条件 2.1 什么是竞态条件 2.2 竞态条件示例 2.3 竞态条件的类型 读-改-写竞态条件 检查再执行竞态条件 3. 线程安全问题的表现形式 3.1 原子性问题 3.2 可见性问题 3.3 有序性问题 4. 实战案例：商品... -
List Functions
Data Setup keys range labels nodes relationships toBooleanList Data Setup SELECT * from cypher ( 'graph_name' , $$ CREATE ( A : Person { name : 'Alice' , age ... -
Flink Queries
Flink Queries Iceberg support streaming and batch read With Apache Flink ‘s DataStream API and Table API. Reading with SQL Iceberg support both streaming and batch read in Flink... -
Cypher in SQL expressions
Using Cypher with ‘=’ Working with Postgres’s IN Clause Working with the Postgres EXISTS Clause Querying Multiple Graphs Cypher cannot be used in an expression— the query must... -
Structured Streaming
Spark Structured Streaming Iceberg uses Apache Spark’s DataSourceV2 API for data source and catalog implementations. Spark DSv2 is an evolving API with different levels of support... -
TDengine
Description Key features Options url [string] username [string] password [string] database [string] stable [string] lower_bound [long] upper_bound [long] Example source ... -
SET
Terminal SET clauses Set a property Return created vertex Remove a property Set multiple properties using one SET clause The SET clause is used to update labels and properti... -
JDO v JPA : API
The two persistence standards in Java have very similar API’s on the face of it. Here we give a comparison of the method calls and their equivalent in the other API. Operation... -
Writes
Spark Writes To use Iceberg in Spark, first configure Spark catalogs . Some plans are only available when using Iceberg SQL extensions in Spark 3. Iceberg uses Apache Spark’s D... -
DELETE
Terminal DELETE clauses Introduction Delete isolated vertices Delete all vertices and edges associated with them Delete edges only Return a deleted vertex The DELETE clause...
