Pooler Error No Such Database
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Pgbouncer No Such Database
From: Dave Page
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Hello again, > > I tried entering "flybase" (the database I am trying to query) in the > maintenance DB field and am now confronted with three database symbols > (under my server connection in the "object browser" panel) with a red "x" > over each of them: > > FB2012_04 > postgres > template1 > > Upon clicking any of them
Pgbouncer No Such User Postgres
I get the same "no such database" error. > > Is the "maintenance DB" a newer addition to PostgreSQL? Might I need to > revert to an older version of pgAdmin? No, it's nothing special - just the first database pgAdmin connects to to examine the server. It's worked that way for 10+ years. So I logged into the server myself, and you're right, pgAdmin doesn't like it. After poking around in psql, I think what they're doing is using either pgBouncer or pgPool (both connection poolers) in front of the database server. The pooler is configured to accept connections to the "flybase" database, and direct them to a database on the server called FB2012_04. The problem is that pgAdmin has no way of knowing about that redirection, and as soon as you click on the FB2012_04 database (or postgres or template1), it tries to connect to it by name, but the pooler doesn't accept the connections, returning the error you see. Unfortunately there's not really anything we can do about that - you'll just have to use psql on the command line I'
2015 Tags: cloud, database, pgbouncer, postgres Waterfall photo by Luke Price The recent release of PgBouncer 1.6, a connection pooler for Postgres, brought a number of new features. psql: error: pgbouncer cannot connect to server The two I want to demonstrate today are the per-database and per-use pool_modes.
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To get this effect previously, one had to run separate instances of PgBouncer. As we shall see, a single pgbouncer config instance can now run different pool_modes seamlessly. There are three pool modes available in PgBouncer, representing how aggressive the pooling becomes: session mode, transaction mode, and statement mode. Session pool mode is https://www.postgresql.org/message-id/CA%2BOCxozgH5LvLGsZvgQVJxGA%2B_4QpxsDam%3DQVKDW81A17cR%2BeQ@mail.gmail.com the default, and simply allows you to avoid the startup costs for new connections. PgBouncer connects to Postgres, keeps the connection open, and hands it off to clients connecting to PgBouncer. This handoff is faster than connecting to Postgres itself, as no new backends need to be spawned. However, it offers no other benefits, and many clients/applications already do their own connection pooling, making http://blog.endpoint.com/2015/09/pgbouncer-user-and-database-poolmode.html this the least useful pool mode. Transaction pool mode is probably the most useful one. It works by keeping a client attached to the same Postgres backend for the duration of a transaction only. In this way, many clients can share the same backend connection, making it possible for Postgres to handle a large number of clients with a small max_connections setting (each of which consumes resources). Statement pool mode is the most interesting one, as it makes no promises at all to the client about maintaining the same Postgres backend. In other words, every time a client runs a SQL statement, PgBouncer releases that connections back to the pool. This can make for some great performance gains, although it has drawbacks, the primary one being no multi-statement transactions. To demonstrate the new pool_mode features, I decided to try out a new service mentioned by a coworker, called Scaleway. Like Amazon Web Services (AWS), it offers quick-to-create cloud servers, ideal for testing and demonstrating. The unique things about Scaleway is the servers are all ARM-based SSDs. Mini-review of Scaleway: I liked it a lot. The interface was smooth and uncluttered
log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might http://dba.stackexchange.com/questions/34136/struggling-with-pgbouncer have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Database Administrators Questions Tags Users Badges Unanswered Ask Question _ Database Administrators Stack Exchange is a question and answer site for database professionals who wish to no such improve their database skills and learn from others in the community. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Struggling with pgBouncer up vote 5 down vote favorite I've got Postgres 9.2 pgbouncer no such and PgBouncer (The version that came with the 'stack builder'). I have a .net application connecting via Npgsql version 2.0.12 on a win7 machine. My application can happily connect straight to the postgres server, but always fails to connect via the pgbouncer. My connection string to npgsql (after some substitution is) Sslmode=Prefer;Timeout=40;Server={0};Port={3};User Id={4};Password={1};Database={2};Pooling=False; (I've also tried to connect to PgBounce with Protocol=3 explicitly and that didn't work.) The database line from pgBounce ini is: [databases] something = host=localhost port=5433 dbname=somethingelse user=someone password=aaa and in the userlist.txt I have "someone" "aaa" as required. When my app runs the npgsql says "connection forcibly closed" and the pgbouncer error log says: 2013-02-06 20:16:57.594 2444 LOG File descriptor limit: -1 (H:-1), max_client_conn: 1000, max fds possible: 1030 2013-02-06 20:16:57.649 2444 LOG listening on ::/6433 2013-02-06 20:16:57.657 2444 LOG listening on 0.0.0.0:6433 2013-02-06 20:16:57.659 2444 LOG process up: pgbouncer 1.5.2, libevent 2.0.19-stable (win32), adns: evdns2 2013-02-06 20:17:22.066 2444 LOG C-01819410: something/someone@fe80::997b:396e:eacc:dd2b:3013 login attempt: db=somethingelse user=someone 2013-02-06 20:17:22.130 2444 LOG S-01836648: something/someone@127.0.0.1:5433