VirtualBox VRDP authentication fails with mstsc.exe

I had this problem, when trying to connect with the External Authentication Method, using the Remote Display server in VirtualBox (4.1.8 and 4.2.0). When I want to connect with Microsoft’s Remote Desktop (mstsc.exe), it failed every time with “Your Remote Desktop session has ended. Your network administrator might have ended the connection (…)”.

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Oracle SQL Developer and a SQL Server Instance

Sometimes… as Oracle DBA you need to connect to SQL Server (with Oracle SQL Developer and jTDS plug-in installed).

When using ‘SQL Server Management Studio’, the ‘Server name’ is in the format:


This won’t work in SQL Developer:

Status : Failure -Unknown server host name 'SERVERNAME\INSTANCE'.

This can be solved using the ‘hostname’ in the next format in SQL Developer:


For me it worked :)

Get wget command for a Metalink / My Oracle Support download with FireFox cliget add-on

Today I ran into an add-on for FireFox which can create a wget command from a download file dialog box. First thing that came in mind was; Will this work for Metalink / My Oracle Support? Yes is does!

The add-on is called ‘cliget’ and can be downloaded here: cliget add-on for FireFox. Continue reading

Installing VirtualBox Guest additions using the command line

[Commands used were against VirtualBox version 4…]

Sometimes you don’t want to use a lot of disk space on your VirtualBox for install software or any ‘temporary’ need of space.

Adding shared folders from your host to your VirtualBox guest is a good option to use. If you have a Windows guest and a GUI based Host, it it’s very easy; click, click, done.

But if you are using a command line based guest and/or host, it a bit more complex. Use this post as a guideline, Linux knowledge is assumed… Continue reading

Kill, cancel and resume or restart datapump expdp and impdp jobs

The expdp and impdp utilities are command-line driven, but when starting them from the OS-prompt, one does not notice it. When you run impdp or expdp and use ‘ctrl-c’ and you want to kill, cancel, start or resume a job, you will end up in the datapump command prompt… now what?!

All command shown here can be used with expdp and impdp datapump. Continue reading

The expdp equivalent of ‘exp consistent=y’…

Update: Legacy Mode

In 11.2, Oracle introduced ‘legacy mode‘ options for expdp and impdp.

One now can use the old exp and imp parameters, including ‘CONSISTENT=Y’.

Legacy Mode Active due to the following parameters:
Legacy Mode Parameter: "consistent=TRUE" Location: Parameter File, Replaced with:
  "flashback_time=TO_TIMESTAMP('2013-05-07 07:18:29', 'YYYY-MM-DD HH24:MI:SS')"
Legacy Mode has set reuse_dumpfiles=true parameter.

For 11.1 and older, original post:

Last few weeks I have been exporting 10g databases for migrating them to 11g. I knew Export Data Pump was read consistent (I have been running into ORA-01555‘s), but I was surprised to see a ORA-02298 (parent keys not found) when importing:

ORA-39083: Object type REF_CONSTRAINT failed to create with error:
ORA-02298: cannot validate (SCOTT.FK_SCALE_ID) - parent keys not found
Failing sql is:

I thought the expdp had made an consistent database dump, but didn’t! The FK’s present in SALARY were not present as PK’s in the SCALE table, so this could only mean the dump was not database consistent at all!

Solution: Using the flashback_time option

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SQLPlus and Easy Connect without password on the command line

The Easy Connect Naming Method allows you to connect to a database service without having to configure Net Service Names.

The most found example on internet is the one with typing the password at the command prompt when starting sqlplus:

sqlplus username/password@[//]host[:port][/service_name]
$> sqlplus system/manager@db_machine:1521/db_servicename

However, this means that the password will be stored in you history of commands (linux). This is not really secure… but sqlplus does not accept it when no password is supplied when using easy connect.

Two solutions

If you want to login with easy connect without typing the password on the command line, you have two options: Continue reading

Use USE_DB_RECOVERY_FILE_DEST for self-managing deletion rules of the Archived Log files

When using the Fast Recovery Area for storing archive logs, one probably wants to use this location to make use of the self-managing deletion rules of files.

One of these rules is that files are obsolete under the retention policy are eligible for deletion. When for instance RMAN needs space for backup (without delete obsolete option), Oracle will do a similar ‘delete obsolete’ command to make space in the Fast Recovery Area.

For archived logs to be eligible, one MUST use the USE_DB_RECOVERY_FILE_DEST setting for log_archive_dest_x. If the actual location is used, Oracle does not include archived logs in the self-managing deletion rules of files!!! Continue reading