MongoDB性能分析工具mongostat使用方法

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mongostat 是 MongoDB 自带的性能分析工具，用于检测 mongodb 的运行状态。

Test:Test/node-131 / # mongostat –help
Usage:
mongostat <options> <polling interval in seconds>

Monitor basic MongoDB server statistics.

See http://docs.mongodb.org/manual/reference/program/mongostat/ for more information.

general options:
–help print usage
–version print the tool version and exit

verbosity options:
-v, –verbose=<level> more detailed log output (include multiple times for more verbosity, e.g. -vvvvv, or specify a numeric value, e.g. –verbose=N)
–quiet hide all log output

connection options:
-h, –host=<hostname> mongodb host to connect to (setname/host1,host2 for replica sets)
–port=<port> server port (can also use –host hostname:port)

ssl options:
–ssl connect to a mongod or mongos that has ssl enabled
–sslCAFile=<filename> the .pem file containing the root certificate chain from the certificate authority
–sslPEMKeyFile=<filename> the .pem file containing the certificate and key
–sslPEMKeyPassword=<password> the password to decrypt the sslPEMKeyFile, if necessary
–sslCRLFile=<filename> the .pem file containing the certificate revocation list
–sslAllowInvalidCertificates bypass the validation for server certificates
–sslAllowInvalidHostnames bypass the validation for server name
–sslFIPSMode use FIPS mode of the installed openssl library

authentication options:
-u, –username=<username> username for authentication
-p, –password=<password> password for authentication
–authenticationDatabase=<database-name> database that holds the users credentials
–authenticationMechanism=<mechanism> authentication mechanism to use

stat options:
–noheaders dont output column names
-n, –rowcount=<count> number of stats lines to print (0 for indefinite)
–discover discover nodes and display stats for all
–http use HTTP instead of raw db connection
–all all optional fields
–json output as JSON rather than a formatted table

举例：

20 秒数据，每 1 秒钟输出

mongostat -h 80.81.2.3 -p 27017 –rowcount 20 1

300 秒数据，每 5 秒输出

mongostat -h 80.81.2.3 -p 27017 -n 300 5

以 json 格式输出

mongostat -h 80.81.2.4 -p 27017 -n 60 1 –json

搜集复制集 aCloud 中所有节点的 60 s 内运行状态，间隔1 s 刷新，保存到文件 mongostat_aCloud.log 中。

mongostat -h aCloud/80.81.2.4,80.81.2.5,80.81.2.6 -p 27017 -n 60 1 >> mongostat_aCloud.log

Sangfor:aCloud/node-131 /var/lib/mongodb # mongostat -h 80.81.2.4 -p 27017 -n 60 1
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time
4327 0 0 0 445 748|0 0.5 4.1 0 1.1G 437.0M 0|0 0|0 834k 1m 7 aCloud PRI 2016-07-21T20:56:48+08:00
3857 0 0 0 442 752|0 0.5 4.1 0 1.1G 438.0M 0|0 0|0 771k 1m 7 aCloud PRI 2016-07-21T20:56:49+08:00

结果解析：

insert 每秒 instert 操作次数
query 每秒 query 操作次数
update 每秒 update 操作次数
delete 每秒 delete 操作次数
getmore 每秒 getmore 操作次数
command 每秒 command 执行次数
flushes 每秒执行 fsync 将数据写入硬盘的次数
vsize 虚拟内存使用量，单位是 MB
res 物理内存使用量，单位 MB
qr|qw 队列中 waiting 的读 / 写次数
ar|aw 已激活 active 的读 / 写次数
netIn 接收端网络速率，单位是bytes
netOut 发送端网络速率，单位是bytes
conn 连接数(open connections)
set 复制集 (replica set) 名称
repl 成员在复制集中的状态(PRI|SEC|ARB|REC)