Problem
You want to reset RMAN configuration to its default state, quickly with one step
Solution
Use the below procedure:
SQL> exec dbms_backup_restore.resetConfig;
This will reset all RMAN configuration to their default values
You want to reset RMAN configuration to its default state, quickly with one step
Use the below procedure:
SQL> exec dbms_backup_restore.resetConfig;
This will reset all RMAN configuration to their default values
You need to configure a CDB database for enabling a GoldenGate extract for replication
Perform the following actions on the source CDB database to prepare for a GoldenGate extract:
At CDB$ROOT:
CREATE USER c##ggadmin IDENTIFIED BY "<password>"
PROFILE <profile>
DEFAULT TABLESPACE SYSAUX
TEMPORARY TABLESPACE TEMP;
GRANT DBA to c##ggadmin;
EXEC DBMS_GOLDENGATE_AUTH.GRANT_ADMIN_PRIVILEGE(GRANTEE => 'C##GGADMIN', CONTAINER => 'ALL' );
alter system set ENABLE_GOLDENGATE_REPLICATION=true scope=both;
alter system set STREAMS_POOL_SIZE=<#_of_extracts * 1>G scope=both;
ALTER DATABASE FORCE LOGGING;
ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;
At PDB level:
ALTER SESSION SET CONTAINER=<pdb>;
CREATE USER ggadmin IDENTIFIED BY "<password>"
PROFILE <profile>
DEFAULT TABLESPACE SYSAUX
TEMPORARY TABLESPACE TEMP;
GRANT DBA TO ggadmin;
EXEC DBMS_GOLDENGATE_AUTH.GRANT_ADMIN_PRIVILEGE('ggadmin');
ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;
You need to configure an Oracle Database 19c for a GoldenGate Extract
1) At CDB$ROOT, create a common admin user for GoldenGate:
CREATE USER c##ggadmin IDENTIFIED BY "<password>"
profile <profile>
DEFAULT TABLESPACE sysaux
TEMPORARY TABLESPACE temp;
GRANT dba to c##ggadmin;
EXEC DBMS_GOLDENGATE_AUTH.GRANT_ADMIN_PRIVILEGE(grantee=>'c##ggadmin', container=>'all');
2) At a PDB, create a local admin user for GoldenGate:
ALTER SESSION SET CONTAINER=<pdb_name>;
CREATE USER ggadmin IDENTIFIED BY "<password>"
profile <profile>
default tablespace users
temporary tablespace temp;
GRANT DBA TO ggadmin;
EXEC DBMS_GOLDENGATE_AUTH.GRANT_ADMIN_PRIVILEGE('ggadmin');
3) At CDB$ROOT, enable GoldenGate for the database:
alter system set ENABLE_GOLDENGATE_REPLICATION=true scope=both;
4) At CDB$ROOT, set the STREAMS_POOL_SIZE parameter based on the formula 1 EXT x 1 GB:
alter system set STREAMS_POOL_SIZE=1g scope=both sid='*';
5) Configure the logging options:
At CDB$ROOT:
ALTER DATABASE FORCE LOGGING;
At CDB$ROOT, and source PDBs:
ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;
Verify with:
SELECT SUPPLEMENTAL_LOG_DATA_MIN, FORCE_LOGGING FROM V$DATABASE;
At CDB$ROOT:
ALTER SYSTEM SWITCH LOGFILE;
You need a better understanding on how Oracle database triggers work with Oracle GoldenGate replication
By default in an Oracle database, triggers do fire only when a statement executed from a user process, and do not fire in case of Oracle-maintained processes, like Logical standby SQL Apply or Oracle Streams replication processes
The property can be changed by using the procedure:
DBMS_DDL.SET_TRIGGER_FIRING_PROPERTY
When set to FALSE, triggers will fire during replication, that is, the statements issued by Replicat processes
You want to create a database link on an Autonomous Database in OCI (Oracle Cloud Infrastructure)
Use commands below to create a db link:
If db link being created in a schema other than ADMIN, grant required privileges:
SQL> grant execute on DBMS_CLOUD_ADMIN to <schema>;
SQL> grant CREATE DATABASE LINK to <schema>;
Create credential;
BEGIN
DBMS_CLOUD.CREATE_CREDENTIAL(
credential_name => '<credential_name>',
username => '<username>',
password => '<password>'
);
END;
Create database link:
BEGIN
DBMS_CLOUD_ADMIN.CREATE_DATABASE_LINK(
db_link_name => '<db_link_name>',
hostname => 'target_db_host_name',
port => '<port>',
service_name => '<service_name>',
ssl_server_cert_dn => NULL,
credential_name => '<credential_name>',
directory_name => NULL,
private_target => true);
END;
While configuring openssh for cygwin, ssh key authentication does not work, the key does not get accepted
Make sure the .ssh directory and the authorized_keys files have required permissions and ownership:
chown <your_username>:none ~/
chmod g-w ~/
chmod 700 ~/.ssh/
chmod 600 ~/.ssh/authorized_keys
You want to change euid or ruid for a process, for example, the snippet below tries to start bash as user oracle executed by user grid:
[grid] $ python3 -c 'import os; import pwd; import sys; import subprocess; uid=pwd.getpwnam("oracle").pw_uid; os.setreuid(uid,uid); retval = subprocess.run(["bash", "--norc"]).returncode; sys.exit(retval);'
Traceback (most recent call last):
File "<string>", line 1, in <module>
PermissionError: [Errno 1] Not owner
Though executing the same snippet as user root succeeds
AIX 7.2 provides Role Based Access Control (RBAC) mechanisms which allows to control certain security aspects of a system.
In particular, RBAC allows to grant privileges to users, roles and process to perform certain actions
To allow a process to call setreuid() run as root:
# setsecattr -c accessauths=ALLOW_ALL innateprivs=PV_DAC_O,PV_DAC_UID secflags=FSF_EPS euid=0 egid=0 /opt/bin/python3.7
# setkst
Note. Aliases not accepted by setsecatt, only direct executables
[grid] $ python3 -c 'import os; import pwd; import sys; import subprocess; uid=pwd.getpwnam("oracle").pw_uid; os.setreuid(uid,uid); retval = subprocess.run(["bash", "--norc"]).returncode; sys.exit(retval);'
[oracle] $
Reference:
You want to manually install the Java Component in a Oracle Database version 11.2 and up
Note. The solution is application only for the first-time installation. If the Java component was previously installed, then this procedure is not applicable for repair/re-install.
1) Optionally, cleanly stop the database, create a guaranteed restore point, enable restricted session:
shutdown immediate;
startup mount;
alter database archivelog;
alter system enable restricted session;
alter database open;
alter system switch logfile;
create restore point before_java guarantee flashback database;
2) Install Java component:
alter system set "_system_trig_enabled" = false scope=memory;
alter system set "java_jit_enabled" = false scope=memory;
spool /tmp/full_jvminst.log;
@?/javavm/install/initjvm.sql
@?/xdk/admin/initxml.sql
@?/xdk/admin/xmlja.sql
11g only @?/rdbms/admin/catexf.sql
@?/rdbms/admin/utlrp.sql
alter system set java_jit_enabled = true scope=memory;
alter system set "_system_trig_enabled"=true scope=memory;
spool off
3) In case of any of the actions of Step 1) was performed, perform the reverse actions:
drop restore point before_java;
shutdown immediate;
startup mount;
alter database noarchivelog;
alter database open;
Reference:
You need to create a dump of a controlfile
Use the below command to dump a controlfile to a trace file:
alter session set events 'immediate trace name controlf level 9';
Identify the location of a trace file by either:
v$diag_info
or
oradebug setmypid
oradebug tracefile_name
You want to disable VIEW PUSHED PREDICATE transformation in a session or for the whole system
Apply the hidden parameter at session or system level:
alter session set "_optimizer_push_pred_cost_based"=false;