mongodb in memory

I was also a recent contact with MongoDB, the understanding of MongoDB is not too deep, here to share a bit of personal experience in using MongoDB, the content may be wrong, for reference only.MongoDB is a nosql non-relational database, is the big data with a relatively large number of non-relational database, providing high concurrency, which in the design of t

Anyone who first came into contact with MongoDB was surprised that it was greedy for memory. For the reason, let me first talk about how Linux manages memory and how MongoDB uses memory, the answer is clear. It is said that learning with problems is more effective, first lo

Label:Currently, MongoDB uses a memory-mapped storage engine, it will convert the disk IO operation into memory operations, if it is read operation, in-memory data play a role in the cache, if it is a write operation, memory can also convert random write operations into sequ

MongoDB is a database based on distributed file storage. Written by the C + + language. Designed to provide scalable, high-performance data storage solutions for Web applications.MongoDB is a product between relational database and non relational database, and is the most powerful and relational database in the relational database. The data structure he supports is very loose and is a JSON-like Bson format, so you can store more complex data types. Th

Basic ideas The use of MongoDB as a memory database (In-memory db), which is not allowing MongoDB to save data to disk, has aroused more and more people's interest. This usage is very useful for the following applications: Write-intensive caching before a slow RDBMS system Embedded system PCI compatible s

MongoDB is a database based on distributed file storage. Written by the C + + language. Designed to provide scalable, high-performance data storage solutions for Web applications.MongoDB is a product between relational database and non relational database, and is the most powerful and relational database in the relational database. The data structure he supports is very loose and is a JSON-like Bson format, so you can store more complex data types. Th

use MongoDB as a pure memory database (Redis style) Basic Ideas The use of MongoDB as a memory database (In-memory db), which is not allowing MongoDB to save data to disk, has aroused more and more people's interest. This usage

This method is extremely useful for the following applications: Write-intensive high-speed cache placed before a slow RDBMS System Embedded System PCI compatible systems without persistent data Unit testing, which requires a lightweight database and can easily clear data in the database) If all this can be achieved, it is really elegant: We can skillfully use the MongoDB query/retrieval function without involving disk operations. You may also know tha

MongoDB has a cool design decision, that is, it can use memory-mappedfile to process read/write requests to data in disk files. This is MongoDB has a cool design decision, that is, it can use memory-mapped file to process read/write requests to data in disk files. This is Basic Ideas

Label: There is a project to use MongoDB, we are deployed in the Windows 2008 64-bit environment, why not deploy to Linux under it, we do not have so many servers, can only be a bit. We all know that MongoDB eat memory is too strong, if not restart the service, memory has been rubbing to rise, timed to restart the

You can bind a cpu to prevent mutual interference between multiple instances. Mongodb memory can also be restricted to the master to prevent all memory occupied by one instance. You can bind a cpu to prevent mutual interference between multiple instances. Mongodb memory can

Basic Ideas MongoDB is used as an in-memory database, that is, it does not allow MongoDB to save data to a disk at all, which has aroused more and more people's interest. This method is extremely useful for the following applications: Write-intensive high-speed cache placed before a slow RDBMS System Embedded System PCI compatible systems without persistent d

100w data query will be very fast";So how to determine the MONGO machine to the memory is reasonable? Here's the formula: physical Memory >mongo The thermal data +mongo the index dataYou can also use the Mongostat command to monitor the memory usage of MongoDB as follows:shell> mongostat mapped vsize res faults 940g 1

Linux limits mongodb memory usage for multiple instances: You can bind a cpu to prevent mutual interference between multiple instances. The memory of www.2cto.com mongodb can also be restricted to the master to prevent all memory occupied by one instance. # Tudou@ B2C .xiaom

Linux limits mongodb memory usage for multiple instances: you can bind a cpu to prevent mutual interference between multiple instances. The memory of www.2cto. commongodb can also be restricted to the master to prevent all memory from being occupied by one instance. # Tudou@ B2C .xiaomi.com [plain] ulimit-s4096 amp ;.

Recently MongoDB will often suddenly hang up, check log found the following error: Copy Code code as follows: Tcmalloc:large alloc 2061584302080 bytes = = (Nil) @ Tue Nov 17:45:04.539 out of memory, printing stack and exiting: 0xdddd81 0x6cfb4e 0x121021d 0xafcc1f 0xaf815f 0xaf8d1d 0xaf8e0f 0xaf52ae 0xaf53c9 0xb1eb11 0x8ab6a2 0x8d78ca 0x8d951d 0x8d Aa72 0xa80970 0xa8523c 0x9f9079 0x9fa5a3 0x6e

Under multiple instances: You can bind a cpu to prevent mutual interference between multiple instances. Mongodb memory can also be restricted to the master to prevent all memory occupied by one instance. Ulimit-s 4096 ulimit-m 31457280 sudo-u mongodb numactl -- cpunodebind = 0 -- localalloc/opt/soft/

Limits MongoDB memory usage Because MongoDB's memory is managed by the system's virtual memory, MongoDB does not interfere with memory management. This can simplify Mongo's work, but the memor