postgreSQL error initdb: command not found - database

i was installing postgresql on ubuntu using linuxbrew:
brew install postgresql
it seems to work fine but after that because i was installing PostgreSQL for the first time i tried creating a database:
initdb /usr/local/var/postgres -E utf8
but it returned as:
initdb: command not found
i tried running the command with sudo but that doesn't helped

run locate initdb it should give you the list to chose. smth like:
MacBook-Air:~ vao$ locate initdb
/usr/local/Cellar/postgresql/9.5.3/bin/initdb
/usr/local/Cellar/postgresql/9.5.3/share/doc/postgresql/html/app-initdb.html
/usr/local/Cellar/postgresql/9.5.3/share/man/man1/initdb.1
/usr/local/Cellar/postgresql/9.6.1/bin/initdb
/usr/local/Cellar/postgresql/9.6.1/share/doc/postgresql/html/app-initdb.html
/usr/local/Cellar/postgresql/9.6.1/share/man/man1/initdb.1
/usr/local/bin/initdb
/usr/local/share/man/man1/initdb.1
So in my case I want to run
/usr/local/Cellar/postgresql/9.6.1/bin/initdb
If you don't have mlocate installed, either install it or use
sudo find / -name initdb

There's a good answer to a similar question on SuperUser.
In short:
Postgres groups databases into "clusters", each of which is a named collection of databases sharing a configuration and data location, and running on a single server instance with its own TCP port.
If you only want a single instance of Postgres, the installation includes a cluster named "main", so you don't need to run initdb to create one.
If you do need multiple clusters, then the Postgres packages for Debian and Ubuntu provide a different command pg_createcluster to be used instead of initdb, with the latter not included in PATH so as to discourage end users from using it directly.
And if you're just trying to create a database, not a database cluster, use the createdb command instead.

I had the same problem and found the answer here.
Ubuntu path is
/usr/lib/postgresql/9.6/bin/initdb
Edit: Sorry, Ahmed asked about linuxbrew, I'm talking about Ubuntu.
I Hope this answer helps somebody.

I had a similar issue caused by the brew install postgresql not properly linking postgres. The solve for me was to run:
brew link --overwrite postgresql

you can add the PATH to run from any location
sudo nano ~/.profile
inside nano go to the end and add the following
# set PATH so it includes user's private bin if it exists
if [ -d "/usr/lib/postgresql/14/bin/" ] ; then
PATH="/usr/lib/postgresql/14/bin/:$PATH"
fi
and configure the alternative
sudo update-alternatives --install /usr/bin/initdb initdb /usr/lib/postgresql/14/bin/initdb 1

Related

cx_Oracle in Azure Databricks

I am unable to establish connection to my Oracle database from Azure Databricks although it works in ADF where I am able to query the table. But ADF takes time to filter the records so I am still trying to connect from Databricks.
I followed the steps from this Microsoft link, both manually and using init-script but error seems to persist.
When I looked into my cluster event log it says the init-script execution was successfully.
Error message when I tried to establish the connection:
DPI-1047: Cannot locate a 64-bit Oracle Client library: "/databricks/driver/oracle_ctl//lib/libclntsh.so: cannot open shared object file: No such file or directory".
When I executed the following command
dbutils.fs.ls("/databricks/driver/")
there was no such directory
This triggered me to post some questions here:
Does this mean the init-script did not perform its job?
Is /databricks/driver/oracle_ctl a hidden directory for dbutils.fs.ls?
Error message points to /databricks/driver/oracle_ctl//lib/libclntsh.so, when I manually inspected the downloaded oracle client, there is no such folder called lib although libclntsh.so exists in the main directory. Is there a problem that databricks is checking the wrong directory for the libclntsh.so?
Does this connections still works for others?
Syntax for connection: cx_Oracle.connect(user= user_name, password= password,dsn= IP+':'+Port+'/'+DB_name)
Above syntax works fine when connected from inside a on-premises machine.
Try installing the latest major release of cx_Oracle - which got renamed to python-oracledb, see the release announcement.
This version doesn't need Oracle Instant Client. The API is the same as cx_Oracle, although obviously the name is different.
If I understand the instructions, your init script would do something like:
/databricks/python/bin/pip install oracledb
Application code would be like:
import oracledb
connection = oracledb.connect(user='scott', password=mypw, dsn='yourdbhostname/yourdbservicename')
with connection.cursor() as cursor:
for row in cursor.execute('select city from locations'):
print(row)
Resources:
Home page: oracle.github.io/python-oracledb/
Quick start: Quick Start python-oracledb Installation
Documentation: python-oracle.readthedocs.io/en/latest/index.html
PyPI: pypi.org/project/oracledb/
Source: github.com/oracle/python-oracledb
Upgrading: Upgrading from cx_Oracle 8.3 to python-oracledb
Changed the path from "/databricks/driver/oracle_ctl/" to "/databricks/driver/oracle_ctl/instantclient" in the init-script and that error does not appear anymore.
Please use the following init script instead
dbutils.fs.put("dbfs:/databricks/<init-script-folder-name>/oracle_ctl.sh","""
#!/bin/bash
sudo apt-get install libaio1
wget --quiet -O /tmp/instantclient-basiclite-linuxx64.zip https://download.oracle.com/otn_software/linux/instantclient/instantclient-basiclite-linuxx64.zip
unzip /tmp/instantclient-basiclite-linuxx64.zip -d /databricks/driver/oracle_ctl/
mv /databricks/driver/oracle_ctl/instantclient* /databricks/driver/oracle_ctl/instantclient
sudo echo 'export LD_LIBRARY_PATH="/databricks/driver/oracle_ctl/instantclient/"' >> /databricks/spark/conf/spark-env.sh
sudo echo 'export ORACLE_HOME="/databricks/driver/oracle_ctl/instantclient/"' >> /databricks/spark/conf/spark-env.sh
""", True)
Notes:
The above init-script was advised by a databricks employee and can be found here.
As mentioned by Christopher Jones in one of the comments, cx_Oracle has been recently upgraded to oracledb with a thin and thick version.
You will get the above error if you don’t have Oracle instant client in your Cluster.
To resolve above error in azure databricks, please follow this code:
%sh
mkdir -p /opt/oracle
cd /opt/oracle
wget https://download.oracle.com/otn_software/nt/instantclient/19600/instantclient-basic-windows.x64-19.6.0.0.0dbru.zip
unzip instantclient-basic-windows.x64-19.6.0.0.0dbru.zip
set ORACLE_HOME=%ORABAS%\instantclient_19_3
set TNS_ADMIN=%ORACLE_HOME%
set PATH=%ORACLE_HOME%;%PATH%
To create init script, use the following code:
As per official doc,
dbutils.fs.put("dbfs:/databricks/<init-script-folder>/oracle_ctl.sh","""
#!/bin/bash
wget --quiet -O /tmp/instantclient-basiclite-linuxx64.zip https://download.oracle.com/otn_software/linux/instantclient/instantclient-basiclite-linuxx64.zip
unzip /tmp/instantclient-basiclite-linuxx64.zip -d /databricks/driver/oracle_ctl/
sudo echo 'export LD_LIBRARY_PATH="/databricks/driver/oracle_ctl/"' >> /databricks/spark/conf/spark-env.sh
sudo echo 'export ORACLE_HOME="/databricks/driver/oracle_ctl/"' >> /databricks/spark/conf/spark-env.sh
""", True)
To read data from oracle database in PySpark follow this article by Emrah Mete
For more information refer this official document:
https://docs.databricks.com/data/data-sources/oracle.html#oracle

Issue running Postgresql 9.6 backup (pg_dump/pg_dumpall)

I have a postgreSQL 9.6 installation on Ubuntu 16.04, provided by the EnterpriseDB. I've been connecting to the local server and using it for a number of months. I figured I should backup the server at this point, so I tried using the pg_dump command as follows:
cd to postgres bin at /opt/PostgreSQL/9.6/bin
Run pg_dump via sudo pg_dumpall > /sata_ssd2/pgdump/0419.bkp
This gives an error: Error: You must install at least one postgresql-client-<version> package. I tried installing via: sudo apt-get install postgresql-client-9.6 but that package does not seem to exist.
I also tried to run pg_dump and pg_dumpall via pgAdmin4. It first made me fill in the binary paths for EDB Advanced Server Binary Path and PostgreSQL Binary Path; I put in opt/PostgreSQL/9.6/bin/, which is where the pg_dump executable is. When I tried to run the backups, I got the error: 'ascii' codec can't decode byte 0xe1 in position 1: ordinal not in range(128). I found an answer to this elsewhere that recommended changing from client_encoding = SQLascii to client_encoding = utf8 in postgresql.conf, but this did not help.
Does anyone have any advice on where to go from here?
In a unix/linux system the current directory . is not on the PATH and not searched for binaries.
If you want to run the command pg_basebackup in /opt/PostgreSQL/9.6/bin/, you run /opt/PostgreSQL/9.6/bin/pg_basebackup.
If you did want to run the command pg_basebackup that you knew was in the current directory you could write ./pg_basebackup instead. But just using the full path rather than cding unnecessarily is better.

Not allowed do anything in PostgreSQL

I've seen plenty of answers across the internet saying that to combat the
psql:FATAL: role <username> does not exist
one must use the createuser command, but about a dozen different attempts with that command have only yielded a similar error message.
I've installed PostgreSQL using Ubuntu 15.04's sudo apt-get install postgresql, but PostgreSQL permits to do absolutely nothing.
Do I need to install some dependencies or something?
Try doing these actions as the postgres user:
$ sudo -u postgres -i
The PostgreSQL installation makes a postgres user which runs the PostgreSQL service. It is essentially the superuser of your database. In most cases, you don't know the password for this user but any superuser of a system can log in to other accounts.

Uninstall MongoDB on Mac OS X

When I try to run mongod from the terminal, I get the following error:
2014-07-02T23:56:24.797-0700 [initandlisten] ERROR: listen(): bind() failed errno:48 Address already in use for socket: 0.0.0.0:27017
2014-07-02T23:56:24.797-0700 [initandlisten] ERROR: addr already in use
I recently realize that I have two versions of MongoDB on my Mac, and think this may be the source for the above error. (Plus, I do not need two version.) I tried Googling, but was not able to find clear directions on how I can uninstall. I have development version 2.7.0 AND 2.6.3.
Thanks so much in advance for the help!
Run the following commands to remove mongodb from the launch/startup and to uninstall it using Homebrew:
# See if mongo is in the launch/startup list
launchctl list | grep mongo
# Remove mongodb from the launch/startup
launchctl remove homebrew.mxcl.mongodb
# Kill the mongod process just in case it's running
pkill -f mongod
# Now you can safely remove mongodb using Homebrew
brew uninstall mongodb
Just double-check in /usr/local/bin/ to make sure that the mongodb commands are removed.
For uninstalling the community version, i found that the command brew uninstall mongodb-community worked for me
Nitin Jadhav version worked for me, brew uninstall mongodb kept given me Error: No such keg: /usr/local/Cellar/mongodb. I was removing a mongodb-community.
use cd /usr/local/Cellar then run ls -a and then run rm -rf mongodb-community to remove it
I would suggest navigating into your /usr/local/Cellar and run an ls -a, I had a community version of mongo installed that wasn't being picked up by the command given above. If you find any mongo versions there just rm -rf each instance
For those having this error in osx:
brew uninstall mongodb Error: No such keg: /usr/local/Cellar/mongodb
execute brew list | grep mongo
for example, it could show something like:
mongodb-community#4.2
mongodb-database-tools
mongosh
remove them with brew uninstall mongodb-community#4.2 mongodb-database-tools mongosh
Also execute launchctl remove homebrew.mxcl.mongodb as #anuvrat-tiku says in his answer.

Setting up PostgreSQL, could not connect to database postgres

I will create a django app on Debian 7 with postgreSQL 9.2.
I created a droplet in digital ocean. I updated and upgraded the system.
I used the following command
sudo aptitude install postgresql postgresql-contrib
to install postgresql.
When I changed user to postgres and I wanted to create a new db user with createuser -P
I filled all the fields it wanted but it came up with this error:
createuser: could not connect to database postgres: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
I tried same process a few times with new droplets in Ubuntu 12.04 and Debian 7.
What should I do?
I want to use Debian 7, so I prefer solutions with Debian.
I am new at this stuff so be explanatory please.
Thanks.
I figured it out with fixing locale problem and reinstall PostgreSQL
First:
http://perlgeek.de/en/article/set-up-a-clean-utf8-environment
Second:
How to thoroughly purge and reinstall postgresql on ubuntu?
Set up the locale and make a clean installation for postgreSQL.
Thanks!

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