mongodb修改Read/Write tickets

进入数据库修改：

use admin
db.adminCommand( { setParameter: 1, wiredTigerConcurrentReadTransactions: 256 } )
db.adminCommand( { setParameter: 1, wiredTigerConcurrentWriteTransactions: 256 } )

或者在配置文件中修改：

# Two options below can be used for wiredTiger and inMemory storage engines
setParameter:
    wiredTigerConcurrentReadTransactions: 256
    wiredTigerConcurrentWriteTransactions: 256