PostgreSQL 9.1 max_wal_senders – The Missing Documentation
When setting up Log Shipping or Streaming Replication with PostgreSQL 9.1, you’ll inevitably come across the max_wal_senders configuration variable. The docs on this are sparse, saying only: “Specifies...
View ArticleApproximating Postgres Replication Delay
Coming from the MySQL world, I’m used to being able to easily determine the replication delay (in seconds) via the SHOW SLAVE STATUS command: mysql> show slave status\G ***************************...
View ArticlePostgres unaware of it’s own connection limits?
Normally I’d just file a bug with something like this, but there’s no PostgreSQL bug tracker. So I’m left with a blog post … I was doing some testing with PostgreSQL memory usage and needed to know...
View Articlepg_stat_activity shows future queries!
This morning I was working on getting some statistics on average transaction open time on a relatively underutilized host when I noticed some oddities. Periodically, I would see that my average...
View ArticlePredicting Postgres Performance By Looking At Old MySQL Bugs
While putting PostgreSQL 9.2 through it’s paces, I noticed some behavior that was eerily familiar. Back in January of 2006, Peter Zaitsev opened a bug against MySQL 4.1 that complained of a comparison...
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