1.neo4j节点数和边关系数达到千万上亿,频繁崩溃,查看内存显示java占用内存过高
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关注 解决方案:
使用命令:./neo4j-admin memrec --database=graph.db
得到如下信息:
# Memory settings recommendation from neo4j-admin memrec: # # Assuming the system is dedicated to running Neo4j and has 7800m of memory, # we recommend a heap size of around 3500m, and a page cache of around 1900m, # and that about 2500m is left for the operating system, and the native memory # needed by Lucene and Netty. # # Tip: If the indexing storage use is high, e.g. there are many indexes or most # data indexed, then it might advantageous to leave more memory for the # operating system. # # Tip: The more concurrent transactions your workload has and the more updates # they do, the more heap memory you will need. However, don't allocate more # than 31g of heap, since this will disable pointer compression, also known as # "compressed oops", in the JVM and make less effective use of the heap. # # Tip: Setting the initial and the max heap size to the same value means the # JVM will never need to change the heap size. Changing the heap size otherwise # involves a full GC, which is desirable to avoid. # # Based on the above, the following memory settings are recommended: dbms.memory.heap.initial_size=3500m dbms.memory.heap.max_size=3500m dbms.memory.pagecache.size=1900m # # The numbers below have been derived based on your current data volume in database and index configuration of database 'graph.db'. # They can be used as an input into more detailed memory analysis. # Lucene indexes: 0k # Data volume and native indexes: 14200m
根据给出的推荐配置,修改neo4j.conf如下三个选项,重启neo4j即可。
```bash dbms.memory.heap.initial_size dbms.memory.heap.max_size bms.memory.pagecache.size=1900m
```
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