MongoDB常用操作

批量更改字段名

db.getCollection('db_hosts').update({},
{$rename :
{"aggregate_top_5_avg_cpu_metric" : "aggregate_cpu_metric_top_5_avg"
}
}, {multi:true}
)

批量删除字段与值

db.getCollection('db_hosts').update({},
{$unset :
{"aggregate_cpu_metric_top_5_avg" : ""}
}
, {multi:true}
)

添加索引

db.getCollection('db_hosts').ensureIndex({'value': -1})

添加组合索引并去重

db.getCollection('db_memory_metric').ensureIndex(
{"host":1,"BusinessMinute":1},
{'unique': true, 'dropDups': true}
)

复杂查询

$or

{
$or: [{a: 2}, {a: 3}],
$or: [{b: 5}, {b: 4}]
}

$or

$and

{
$and: [
{$or : [{'a':2},{'b':3}]},
{$or : [{'a':4},{'b':5}]}
]
}

$or

$and

db.getCollection('aggregate_day_host_metric2').find({"$and":[
{"BusinessDay":{"$gte":17043,"$lte":17043}},
{"$or":[
{"cpu_metric.top_5_avg":{"$gte":0,"$lte":20}},
{"memory_metric.top_5_avg":{"$gte":0,"$lte":19}}]},
{"$or":[
{"host.az_id":4001},
{"host.az_id":5001}]}
]
})