Thread: Sample database with difficult SQL questions
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From: g.singh@utwente.nl
To: <pgsql-general@postgresql.org>
Subject: [GENERAL] Postgres 8.4 stopped working---Please urgent help needed
Date: Sat, Jun 8, 2013 5:04 pm
I have a problem with PostgreSQL 8.4. It was working perfectly fine but after the restart (within a couple of minutes) of my system whenever I login to PostgreSQL 8.4 (localhost:5432) it gives error as under:
Server doesn't listen
The server doesn't accept connections: the connection library reports
could not connect to server: Connection refused (0x0000274D/10061) Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432? could not connect to server: Connection refused (0x0000274D/10061) Is the server running on host "localhost" (127.0.0.1) and accepting TCP/IP connections on port 5432?
If you encounter this message, please check if the server you're trying to contact is actually running PostgreSQL on the given port. Test if you have network connectivity from your client to the server host using ping or equivalent tools. Is your network / VPN / SSH tunnel / firewall configured correctly?
For security reasons, PostgreSQL does not listen on all available IP addresses on the server machine initially. In order to access the server over the network, you need to enable listening on the address first.
For PostgreSQL servers starting with version 8.0, this is controlled using the "listen_addresses" parameter in the postgresql.conf file. Here, you can enter a list of IP addresses the server should listen on, or simply use '*' to listen on all available IP addresses. For earlier servers (Version 7.3 or 7.4), you'll need to set the "tcpip_socket" parameter to 'true'.
You can use the postgresql.conf editor that is built into pgAdmin III to edit the postgresql.conf configuration file. After changing this file, you need to restart the server process to make the setting effective.
If you double-checked your configuration but still get this error message, it's still unlikely that you encounter a fatal PostgreSQL misbehaviour. You probably have some low level network connectivity problems (e.g. firewall configuration). Please check this thoroughly before reporting a bug to the PostgreSQL community.
I checked the pg_log file and it shows following:
2013-06-08 20:16:58 CESTLOG: database system was shut down at 2013-06-08 20:10:02 CEST
2013-06-08 20:16:58 CESTFATAL: the database system is starting up
2013-06-08 20:16:58 CESTLOG: database system is ready to accept connections
2013-06-08 20:16:58 CESTLOG: autovacuum launcher started
I am unable to make out what is going wrong. Then I try to restart the Postgres service but it does not get started and gives error continuously. The error is:
Windows could not start the PostgreSQL Server 8.4 service on Local Computer.
Error 1053: The service did not respond to the start or control request in a timely fashion.
Please I need urgent help please…
Thanks and Regards
Gaurav
On 06/09/2013 07:42 AM, Alexander Gataric wrote: > I need a sample database and hard practice SQL questions (multiple joins, window functions, subqueries, CTEs) to writead hoc queries or perform database tasks. Any suggestions are welcome. Thanks in advance. One option would be to look through Stack Overflow problems tagged [postgresql] and assemble a list. All user-generated content on Stack Overflow is licensed under cc-wiki with attribution required (see the footer): http://creativecommons.org/licenses/by-sa/3.0/ http://blog.stackoverflow.com/2009/06/attribution-required/ so you're free to take things like sample data people have posted and use them in the DB so long as you identify the sources of what you use and make it available to others under the same terms. Additional tags like [crosstab], [window-functionss], [pivot], [subquery], [join], [common-table-expression] etc will sometimes help you find more - in cases where it was primarily about subqueries, CTEs, etc rather than answers just incidentally using them. Don't rely solely on these tags, you'll want to do a bit of searching too. It would be quite valuable to have such a collection. I'm not aware of anything along those lines that already exists for PostgreSQL - a wholly artificial demo data DB for SQL problems or one assembled from user examples. -- Craig Ringer http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services