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Are there any issues with the pgpool set up?
I have a set up where I have 1 pgpool, 1 primary postgres and 2 standby postgres. And I am seeing following issues: Issue 1 : Pgpool is not able to detect primary and says all are standby.
How to run a query on a pool?
Often we only need to run a single query on the database, so as convenience the pool has a method to run a query on the first available idle client and return its result. pool.query (callback: (err?:
How does the pool work in PostgreSQL backend?
Whenever the pool establishes a new client connection to the PostgreSQL backend it will emit the connect event with the newly connected client. This presents an opportunity for you to run setup commands on a client. Whenever a client is checked out from the pool the pool will emit the acquire event with the client that was acquired.
When to use pool.query or releasecallback?
Notice in the example above no releaseCallback was necessary. The pool is doing the acquiring and releasing internally. I find pool.query to be a handy shortcut in a lot of situations. Do not use pool.query if you need transactional integrity: the pool will dispatch every query passed to pool.query on the first available idle client.
How does pgpool II work with PostgreSQL database?
Pgpool-II saves connections to the PostgreSQL servers, and reuse them whenever a new connection with the same properties (i.e. username, database, protocol version) comes in. It reduces connection overhead, and improves system’s overall throughput. Pgpool-II can manage multiple PostgreSQL servers.
What are the child processes in pgpool database?
PIDs 101498 and 101499 are the child processes and any one of them can act as PID1 (referenced in the diagram), depending on which one of these is handling incoming client requests. Let’s make a connection to PgPool in order to connect to the database.
What is the output of PG is in recovery?
Here’s the output for pg_is_in_recovery () on all the nodes where it correctly says which is primary’f’ and which is standby’t’: Issue 2 : Pgpool creates persistent connection with only one of the standby with status 2