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    Creative Commons License
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    Sat, 13 Dec 2014


    /Admin/databases/Oracle: Importing a Dump File in Oracle

    In Oracle, there is an old way to import ("imp") and a new way ("impdp"). Here I have examples of both.

    There is a one-to-one relationship between users and schemas (="database"), but not all users have schemas. The first step in creating a new schema/database is to create a new user (C## prefix required):

    SQL> create user C##anewuser identified by anewuser;

    Grant some minimal privileges:

    SQL> grant connect, create session, imp_full_database to C##anewuser;
    SQL> alter user C##anewuser quota 200M on users;

    Prepare to import the dump file:

    su oracle
    cd /home/oracle/app/oracle/product/12.1.0/dbhome_1/bin

    Import an old-style dump file:

    ./imp \"/ as sysdba\" file=/home/oracle/app/oracle/admin/orcl/dpdump/dumpfile.dmp fromuser=olduser touser=C##anewuser log=/tmp/dumpfile.log;

    Import an new-style dump file:

    ./impdp C##newuser/password dumpfile=expdp_dumpfile.dmp remap_schema=olduser:C##newuser log=expdp_dumpfile.log full=y;

    Some gotchas..... Both of the above require knowing the old schema name, which is not terribly easy to figure out. Try leaving out the fromuser/touser/remap_schema stuff on the first pass and just look at the error messages in the log. Sometimes an import is looking for a tablespace that does not exist. Create the stupid thing:

    SQL> CREATE TABLESPACE ONBASETEMP DATAFILE 'ONBASETEMP.dat' SIZE 40M ONLINE;

    and then re-run the import.

    Now verify new schema shows up in list of existing schemas:

    SQL> select distinct owner from dba_objects;

    Verify tables exist in newly imported schema:

    SQL> SELECT DISTINCT OWNER, OBJECT_NAME FROM DBA_OBJECTS WHERE OBJECT_TYPE = 'TABLE' AND OWNER = 'C##anewuser';

    Verify a table has columns:

    SQL> describe C##anewuser.sometablename;

    Verify a table has contents:

    SQL> select * from C##anewuser.sometablename;

    posted at: 05:20 | path: /Admin/databases/Oracle | permanent link to this entry


    /Admin/LVM: How to Add a New Disk to LVM

    Find the new disk:

    fdisk -l

    Initialize the disk for LVM use:

    pvcreate /dev/sdb

    You can now see the new physical LVM volume with pvs. Add the physical volume to an existing volume group:

    vgextend vg_oracle /dev/sdb

    vgs should now show that the vg_oracle volume group now has a bunch of new free space (VFree). This space can be added to an existing logical volume with lvextend, or it can be used to create new logical volumes.

    posted at: 03:17 | path: /Admin/LVM | permanent link to this entry