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发布于 2015-09-14 14:43:52 | 214 次阅读 | 评论: 0 | 来源: 网络整理
FAQ: 基础
MongoDB是什么类型的数据库?
MongoDB数据库有表吗?
MongoDB数据库有模式吗?
What languages can I use to work with the MongoDB?
Does MongoDB support SQL?
What are typical uses for MongoDB?
Does MongoDB support transactions?
Does MongoDB require a lot of RAM?
How do I configure the cache size?
Does MongoDB require a separate caching layer for application-level caching?
Does MongoDB handle caching?
Are writes written to disk immediately, or lazily?
What language is MongoDB written in?
What are the limitations of 32-bit versions of MongoDB?
FAQ: 应用开发者
What is a namespace in MongoDB?
How do you copy all objects from one collection to another?
If you remove a document, does MongoDB remove it from disk?
When does MongoDB write updates to disk?
How do I do transactions and locking in MongoDB?
How do you aggregate data with MongoDB?
Why does MongoDB log so many “Connection Accepted” events?
Does MongoDB run on Amazon EBS?
Why are MongoDB’s data files so large?
How do I optimize storage use for small documents?
When should I use GridFS?
How does MongoDB address SQL or Query injection?
How does MongoDB provide concurrency?
What is the compare order for BSON types?
How do I query for fields that have null values?
Are there any restrictions on the names of Collections?
How do I isolate cursors from intervening write operations?
When should I embed documents within other documents?
Can I manually pad documents to prevent moves during updates?
FAQ:
mongo
壳
How can I enter multi-line operations in the
mongo
shell?
How can I access to different databases temporarily?
Does the
mongo
shell support tab completion and other keyboard shortcuts?
How can I customize the
mongo
shell prompt?
Can I edit long shell operations with an external text editor?
FAQ: 并发
MongoDB使用什么类型的锁?
How granular are locks in MongoDB?
How do I see the status of locks on my
mongod
instances?
Does a read or write operation ever yield the lock?
Which operations lock the database?
Which administrative commands lock the database?
Does a MongoDB operation ever lock more than one database?
How does sharding affect concurrency?
How does concurrency affect a replica set primary?
How does concurrency affect secondaries?
What kind of concurrency does MongoDB provide for JavaScript operations?
FAQ: 分片
Is sharding appropriate for a new deployment?
How does sharding work with replication?
Can I change the shard key after sharding a collection?
What happens to unsharded collections in sharded databases?
How does MongoDB distribute data across shards?
What happens if a client updates a document in a chunk during a migration?
What happens to queries if a shard is inaccessible or slow?
How does MongoDB distribute queries among shards?
How does MongoDB sort queries in sharded environments?
How does MongoDB ensure unique
_id
field values when using a shard key
other
than
_id
?
I’ve enabled sharding and added a second shard, but all the data is still on one server. Why?
Is it safe to remove old files in the
moveChunk
directory?
How does
mongos
use connections?
Why does
mongos
hold connections open?
Where does MongoDB report on connections used by
mongos
?
What does
writebacklisten
in the log mean?
How should administrators deal with failed migrations?
What is the process for moving, renaming, or changing the number of config servers?
When do the
mongos
servers detect config server changes?
Is it possible to quickly update
mongos
servers after updating a replica set configuration?
What does the
maxConns
setting on
mongos
do?
How do indexes impact queries in sharded systems?
Can shard keys be randomly generated?
Can shard keys have a non-uniform distribution of values?
Can you shard on the
_id
field?
Can shard key be in ascending order, like dates or timestamps?
What do
moveChunk
commit
failed
errors mean?
How does draining a shard affect the balancing of uneven chunk distribution?
FAQ: 副本集和在MongoDB中复制
What kinds of replication does MongoDB support?
What do the terms “primary” and “master” mean?
What do the terms “secondary” and “slave” mean?
How long does replica set failover take?
Does replication work over the Internet and WAN connections?
Can MongoDB replicate over a “noisy” connection?
What is the preferred replication method: master/slave or replica sets?
What is the preferred replication method: replica sets or replica pairs?
Why use journaling if replication already provides data redundancy?
Are write operations durable if write concern does not acknowledge writes?
How many arbiters do replica sets need?
What information do arbiters exchange with the rest of the replica set?
Which members of a replica set vote in elections?
Do hidden members vote in replica set elections?
Is it normal for replica set members to use different amounts of disk space?
FAQ: 存储
What are memory mapped files?
How do memory mapped files work?
How does MongoDB work with memory mapped files?
What are page faults?
What is the difference between soft and hard page faults?
What tools can I use to investigate storage use in MongoDB?
What is the working set?
Why are the files in my data directory larger than the data in my database?
How can I check the size of a collection?
How can I check the size of indexes?
How do I know when the server runs out of disk space?
FAQ: 索引
Should you run
ensureIndex()
after every insert?
How do you know what indexes exist in a collection?
How do you determine the size of an index?
What happens if an index does not fit into RAM?
How do you know what index a query used?
How do you determine what fields to index?
How do write operations affect indexes?
Will building a large index affect database performance?
Can I use index keys to constrain query matches?
Using
$ne
and
$nin
in a query is slow. Why?
Can I use a multi-key index to support a query for a whole array?
How can I effectively use indexes strategy for attribute lookups?
FAQ: 诊断
Where can I find information about a
mongod
process that stopped running unexpectedly?
Does TCP
keepalive
time affect sharded clusters and replica sets?
Memory Diagnostics
Sharded Cluster Diagnostics
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