Tag Archives: MongoDB
MongoDB set up admin and security after installed
You must set an admin and password before using mongDB for security reason. You may receive some error when you login to MongoDB shell.
Fast way to find duplicate data in MongoDB
I need to find out the duplicate data content in my 40 Millions records, then I can make the unique index to my name field. > db.collecton.aggregate([ … { $group : {_id : “$field_name”, total : { $sum : 1 } } }, … { $match : { total : { $gte : 2 } Continue reading “Fast way to find duplicate data in MongoDB”
How to Install MongoDB 3.2 on CentOS 7
vim /etc/yum.repos.d/mongodb.repo Paste this to the file and save using :wq [MongoDB] name=MongoDB Repository baseurl=http://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.2/x86_64/ gpgcheck=0 enabled=1 Download and install mongodb using yum yum install mongodb-org -y Start mongod and configure auto start while system boot /etc/init.d/mongod restart chkconfig mongod on Check all the versions [root@juzhax ~]# mongo –version MongoDB shell version: 3.2.3 [root@juzhax ~]# Continue reading “How to Install MongoDB 3.2 on CentOS 7”
WARNING: /sys/kernel/mm/transparent_hugepage/enabled is ‘always’.
After I install MongoDB 3.2.3 in Centos 7, I received this error when I start mongo in shell. Solution Create the init.d script. Create the following file at /etc/init.d/disable-transparent-hugepages: Make it executable. Run the following command to ensure that the init script can be used:
WARNING: Cannot detect if NUMA interleaving is enabled. Failed to probe “/sys/devices/system/node/node1”: Permission denied
[root@master ~]# mongo MongoDB shell version: 3.2.3 connecting to: test Server has startup warnings: 2016-02-29T23:11:36.666+0700 I CONTROL [initandlisten] 2016-02-29T23:11:36.667+0700 I CONTROL [initandlisten] ** WARNING: Cannot detect if NUMA interleaving is enabled. Failed to probe “/sys/devices/system/node/node1”: Permission denied 2016-02-29T23:11:36.667+0700 W CONTROL [initandlisten] 2016-02-29T23:11:36.667+0700 W CONTROL [initandlisten] Failed to probe “/sys/kernel/mm/transparent_hugepage”: Permission denied 2016-02-29T23:11:36.667+0700 W CONTROL [initandlisten] Continue reading “WARNING: Cannot detect if NUMA interleaving is enabled. Failed to probe “/sys/devices/system/node/node1”: Permission denied”
WARNING: soft rlimits too low. rlimits set to 4096 processes, 64000 files. Number of processes should be at least 32000 : 0.5 times number of files.
I’ve received this error while starting mongo in shell while installing on [root@master ~]# mongod –version db version v3.2.3 git version: b326ba837cf6f49d65c2f85e1b70f6f31ece7937 OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013 allocator: tcmalloc modules: none build environment: distmod: rhel70 distarch: x86_64 target_arch: x86_64 [root@master ~]# mongo –version MongoDB shell version: 3.2.3 CentOS Linux release 7.2.1511 (Core) WARNING: Continue reading “WARNING: soft rlimits too low. rlimits set to 4096 processes, 64000 files. Number of processes should be at least 32000 : 0.5 times number of files.”