Blog for DBA

Blog For DBA. Learn Mangodb, cassandra, mysql, orcale, sql server. This is a blog about database administration.

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Blogfordba.org news digest

  • 5 years

    Upgrade Config Server to Replica Set

    Upgrade Config Servers to Replica Set
    Only upgrade Mirrored config servers (SCCC) to CSRS if all members of the mongod config instance are at least v3.2.4.
    The existing config server must be in sync.

  • 6 years

    Configure 3 member replica set with RBAC

    To Configure 3 member replica set, I have configured 3 virtual box for demonstration purpose. These are below steps to configure it.
    Step 1.
    Make directories for data, log, config file, keyfile  in each members of replica set. Data directory will store the actual data files, log directory will store the log info of the mongodb , config directory will be used for storing the config file and...

  • 6 years

    How Cassandra Reads the data?

    To Satisfy read/write request, it must achieve consistency level (whatever we define, either CL = 1, 2 or Quorum. To know more, please check consistency level).
    To complete the read request, Cassandra combine the request set of active MemTable and SSTables....

  • 6 years

    Reconfigure Grid Infrastructure on Standalone Environment (11.2.0.4):

    De-configure has:
    [root@DG2 ~]# /u01/app/11.2.0.4/grid/perl/bin/perl /u01/app/11.2.0.4/grid/crs/install/roothas.pl -deconfig -force
    Using configuration parameter file: /u01/app/11.2.0.4/grid/crs/install/crsconfig_params

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