What is a Flex ASM and how to check if it is enabled?

In versions prior to 12c, the ASM instance needed to be run on each of the nodes of the cluster. In case ASM was not able to start, the database instance located on the same node was not able to come up also. There were a hard dependency between database and ASM instances.

With Oracle Flex ASM, databases are able to connect remote ASM using network connection(ASM network). In case of ASM instance fails, the database instance will reconnect to another ASM instance on another node. This feature is called Oracle Flex ASM.

Check if you are using such a great feature using the following command:

[grid@rac1 ~]$ asmcmd
ASMCMD> showclustermode
ASM cluster : Flex mode enabled


Install PL/SQL Developer under Wine on Linux

First of all, let’s install Wine.

Note: when in the beginning there is # sign, means user is root and where there is $ the user is oracle.

Installing Wine

But if you have internet access you can run just the following :

# sudo apt-get install wine

Because of I don’t have internet on my server, I use the following steps to install wine.

0. Before installing wine you must have flex version 2.5.33 or more.

Download link: http://flex.sourceforge.net/

# cd flex-2.5.33
# make
# make install
# make clean
# make distclean
# flex –version

1. Download wine installation from: http://www.winehq.org/download/

Section: Wine Source Downloads

My downloaded file is named wine-1.3.13.tar.bz2.

2. Extract

# tar -jxvf wine-1.3.13.tar.bz2
#  cd wine-1.3.13
#  ./configure
#  make depend
#  make
#  make install

It needs some time to complete, so be patient. 🙂

Installing the Oracle Client

1. Download file from here: http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html

I choose Instant Client for Microsoft Windows (32-bit) and then instantclient-basic-nt- here are all files required to run OCI, OCCI, and JDBC-OCI applications.

2. Extract

$ unzip instantclient-basic-nt-

3. Create necessary directories, locate software and set variables

Run winecfg, it will create .wine directory under $HOME.

$ winecfg

Under Drives tab, there will be entries like:

Letter   |  Drive Mapping
C:         |  ../drive_c
Z:          | /

Means our C drive will be $HOME/.wine/drive_c

Now create directories……..

$ cd $HOME/.wine/drive_c
$ mkdir -p oracle/bin
$ mkdir -p oracle/network/admin

Go to the directory where you have extracted instantclient_11_2 and copy its content to oracle/bin directory:
$ mv instantclient_11_2/*  $HOME/.wine/drive_c/oracle/bin

Now we have all neccessary .dll files in $HOME/.wine/drive_c/oracle/bin the same as C:\oracle\bin

Modifying regedit…

$ wine regedit

Under HKEY_LOCAL_MACHINE\Software add new key called Oracle.
Under HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SessionManager\Environment
Edit the following values at the end of the PATH variable: c:\oracle;c:\oracle\bin
Create new string value named TNS_ADMIN with the value data c:\oracle\network\admin.


Now place sqlnet.ora and tnsnames.ora files into the c:\oracle\network\admin directory:





(ADDRESS = (PROTOCOL = TCP)(HOST = compname)(PORT = 1521))

Installing PL/SQL Developer

1. Download the software from here(note, it is a trial): http://www.allroundautomations.com/

Install and run the software.

You will see incomplete login window, where “Connect as” field is not displayed.

Now let’s solve this:

1. Close the window and under Preferences->Oracle->Connection fill the following fields:

Oracle Home (empty is autodetect): C:\oracle
OCI library (empty is autodetect): C:\oracle\bin\oci.dll

2. Preferences-> User Interface->Appearance  uncheck Faded disabled buttons

Re-run PL/SQL Developer.

That’s it.