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"libnnz19.so: cannot open shared object file: No such file or directory

I have installed cx_oracle(python3) and instant client 21_1 inside a container. When I try to first time I got this error
Cannot locate a 64-bit Oracle Client library: "/python-
env/instantclient_21_1/lib/libclntsh.so:
So I have created lib under /python-env/instantclient_21_1/ and tried again, now I'm getting this error
cx_Oracle.DatabaseError: DPI-1047: Cannot locate a 64-bit Oracle Client library: "libnnz19.so: cannot open shared object file: No such file or directory". See https://cx-oracle.readthedocs.io/en/latest/user_guide/installation.html for help
I don't understand where is it searching for the that so file. It is already present in /python-
env/instantclient_21_1/lib/
Please help

Follow the Instant Client installation steps or cx_Oracle Installation steps and use ldconfig to set the library path to include the Instant Client directory.
You could set DPI_DEBUG_LEVEL=64 (see here) to trace how cx_Oracle is looking for the libraries.
Also see Docker for Oracle Database Applications in Node.js and Python.

How to locate Oracle Instant Client in Python in Docker CI/CD pipeline

I am trying to connect to oracle DB to execute some SQL queries and fetch data through a python script . I have imported cx_Oracle and tried connecting.I got the error as - Exception - DPI-1047: Cannot locate a 64-bit Oracle Client library: "libclntsh.so: cannot open shared object file: No such file or directory". See https://cx-oracle.readthedocs.io/en/latest/user_guide/installation.html for help was raised.
I downloaded instaclient and used that in my script and it worked using the below commands :
LOCATION = r"C:\instantclient_19_5"
os.environ["PATH"] = LOCATION + ";" + os.environ["PATH"]
But now I need to use this in CI CD pipeline. I have created a docker image for instaclient and python I am trying use this into my script. But I am not sure how to use add instaclient location in script (like the above code snippet) Could you please help me with this.

If you were deploying to Windows (or macOS), you could have used the new cx_Oracle 8 init_oracle_client() function, which is preferred to fiddling with PATH.
However it seems you are deploying to Linux, meaning the system library search path needs to contain all library directories before the process start. So you need to use ldconfig or set LD_LIBRARY_PATH as traditionally used on Linux. The cx_Oracle doc Installing cx_Oracle on Linux and Locating the Oracle Client Libraries covers this.
Also see sample docker images for Linux developers and for basic Oracle Instant Client. If you are not on an RPM based system, check out the sample Docker files in Docker for Oracle Database Applications in Node.js and Python.
In summary, download Oracle Instant Client Basic or Basic Light packages from here. If you got the ZIP files then run something like:
RUN echo /opt/oracle/instantclient_19_8 > /etc/ld.so.conf.d/oic.conf && \
ldconfig
The details vary with what base Docker image you are using, and whether you want to install Instant Client from ZIP files or RPMs.

error trying to access IBM DB2 using python

I tried connecting my python server with IBM DB2 and got this error. I searched online, tried many things and nothing could fix it. I couldn't find the db2dsdriver.config anywhere in the IBM folder. For context, I'm trying to access an online IBM db using a python flask server that I'm running locally
File "server.py", line 8, in <module>
conn = ibm_db.connect("BLUDB","MyDB2loginhere","psswd")
Exception: [IBM][CLI Driver] SQL1531N The connection failed because the name specified with the DSN connection string keyword could not be found in either the db2dsdriver.cfg configuration file or the db2cli.ini configuration file. Data s SQLCODE=-1531cified in the connection string: "BLUDB"

Answered by comments.
By default when you install python module ibm_db it delivers a small ODBC driver from IBM called clidriver for connecting to local or remote Db2 databases. Other ODBC drivers are available, including from other suppliers different from IBM. With an IBM supplied driver (including clidriver), an additional license may be required only for accessing Db2-for-Z/OS, or Db2 for i series. Specifically for i-series, it is cheaper to use the ODBC driver option that is available via IBM product called IBM i access (cheaper than buying a license for Db2-connect to use with clidriver).
To connect to a database, you either use an externally configured DSN (data source name), or use a connection string in your code.
Externally configured DSNs mean that your code does not hard-code any connectivity details, so it is easier to move between different environments without changing code, because the configuration is all external data. You can also arrange the connection-strings to be external.
To configure an external DSN, either use local tools or edit the db2dsdriver.cfg file, which is a small XML file you can create and edit manually or via db2cli command lines. Local tools can be odbcad32 on MS-Windows or unixODBC on Linux/Unix/MacOS. The IBM published documentation in the Db2 Knowledge Center gives all the details of db2dsdriver.cfg.
To use a connection-string, you need the target database hostname (server name, or cloud service name), the port-number, the database-name, and a userid+password (or personal-certificate for Db2-for-Z/OS). The format of the connection string is a semi-colon separated/terminated collection of X=Y pairs, like this:
conn_string="Server=hostname_or_ip_address_of_the_Db2_server_Or_Cloud_Service;Port=50000;Database=BLUDB;UID=***;PWD=***;"
Many other additional and optional settings can be set in that connection string to control other aspects of the connection, or to specify encryption. These are connection attributes or connection properties and are all documented in the Db2 knowledge centre.
The python code to use the connection string looks like:
conn = ibm_db.connect( conn_string , "", "" )
or
conn = ibm_db.connect( conn_string, user, password)
if you exclude the UID and PWD from the connection string and supply then as the second and third parameters to the ibm_db.connect() .

How I managed to do in 2021. What you will need:
Python 3.7
PipEnv
Ibm-db
Ibm-db version is not important but this lib only works with Python 3.7 (current python version is 3.9).
Install Python 3.7.6 in your machine (this is the version that worked).
In your IDE create a new python file.
Let's create a Virtual Enviroment to make sure we will use Python 3.7
pip install pipenv
After installing
pipenv install --python 3.7
Activate the Virtual Environment
pipenv shell
You can use pip list to verify if you are in the new Virtual Enviroment - if list only shows 3 or 4 libs, it's because you are
Now you can download Ibm_db
pip install ibm-db
You may add this to your code to confirm what is the version you are using
from platform import python_version
print(python_version())
Now accessing the DB2
import ibm_db_dbi as db
# Connect to DB2B1 (keep Protocol as TCPIP)
conn = db.connect("DATABASE=DBNAME;HOSTNAME=hostname;PORT=port;PROTOCOL=TCPIP;UID=Your User;PWD=Your Password;", "", "")
Checking all tables available
for t in conn.tables():
print(t)
Your SQL code:
sql_for_df = """SELECT *
FROM TABLE
WHERE ..."""
Visualizing as DataFrame
First install pandas as it will not be present in your Virtual Environment
pip install pandas
After that import to your code and play around
import pandas as pd
df = pd.read_sql(sql_for_df, conn)
df.head()
To exit the VIrtual Enviroment just write exit in your terminal. If you want to remove the Virtual Enviroment write in the terminal pipenv --rm
That's pretty much all I could learn so far. I hope it helps you all.

When using cx_Oracle does Oracle need to be installed on all computers with the python application?

I created an exe of my program that communicates with an oracle database using cx_Oracle to create excel sheets. If someone else uses this exe will they need Oracle installed?

Any computer that runs Python programs using cx_Oracle will need an 'Oracle client' installed. This is the set of Oracle libraries needed by cx_Oracle that allow connections to a database. The database can be on a remote computer. The Oracle client libraries are available in three different installs:
With the Oracle Database install
With a 'full' Oracle Client install
From Oracle Instant Client
The most common in your case would be to use Oracle Instant Client, which is relatively small and is simple to install.
You download the Instant Client 'Basic' package matching your operating system and the Python architecture (32 or 64 bit). Unzip it. Set your operating system search path such as PATH (on Windows) or LD_LIBRARY_PATH or ldconfig (on Linux) to the directory you unzipped.
Instant Client Downloads and instructions are at https://www.oracle.com/database/technologies/instant-client.html
cx_Oracle installation instructions are at https://cx-oracle.readthedocs.io/en/latest/user_guide/installation.html

DLL file load failed For Cx_oracle

I'm using Python 3.1.2. I've downloaded cx_Oracle (Windows x86 Installer (Oracle 10g, Python 3.1)). I'm using Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64-bit.
I'm trying to access a remote Oracle server. I haven't installed any Oracle client. However, I use SQLTools 1.5.0, which I manually copy-pasted from some place.
I came to know cx_Oracle needs a DLL file from an Oracle client to access a remote database, so I copied all the DLL files from the folder of SQLTools to a location. I added the location where I kept the ora.dll into the system's environment variable (PATH and ORACLE_HOME). But it doesn't seem to work. I get the same error:
ImportError: DLL load failed: The specified module could not be found.
I'm missing something. Will this manual work do the job or do I have to install an Oracle client?

The Oracle client isn't an installer, but a series of zip packages. Download the appropriate Instant Client from this here (http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html), unzip them, stick them on your C drive or anywhere you prefer, and add it to your LD_LIBRARY_PATH and ORACLE_HOME env vars.