Detection of COMMIT queries stuck because of synchronous replication in Postgres

2015-09-30 04:10:43 +0000

Since its introduction in 9.1, [synchronous replication] (https://www.postgresql.org/docs/devel/static/warm-standby.html#SYNCHRONOUS-REPLICATION), or the ability to wait for a WAL flush confirmation from a standby before committing a transaction on the master node (depends on synchronous_commit whose default value is on), ensuring that the transaction committed has not been lost on the standby should a failover need to be done, has faced a wide adoption in many production environments for applications that need a no-data-loss scenario. Still, such application or clients may have seen something like that:

Postgres 9.6 feature highlight - Lock names with trace_lwlocks

2015-09-13 12:07:11 +0000

Today, here is some highlight about a small feature that will available in Postgres 9.6, useful for application and monitoring purposes:

Postgres extension to retrieve file system information

2015-09-05 14:02:22 +0000

The set of [file access functions] (https://www.postgresql.org/docs/devel/static/functions-admin.html#FUNCTIONS-ADMIN-GENFILE) already present in PostgreSQL offer no direct possibility to retrieve file system information, giving for example no coverage of how a file system is behaving while running a given PostgreSQL instance. Modern platforms offer usually the Posix system call statvfs, that allows to retrieve this information. However, there is no direct equivalent on Windows, making the chance to have an in-core feature available depend on what are the equivalent things available statvfs for Windows, which may become ugly because this would require at quick glance the use of multiple low-level functions like for example GetDiskFreeSpaceExW to get the amount of free space available in a given path. At least that would be less elegant than calling simply statvfs.

Postgres 9.6 feature highlight - Lock reductions for ALTER TABLE SET

2015-08-24 14:06:56 +0000

ALTER TABLE has been known for many years in the Postgres ecosystem as being a command taking systematically an ACCESS EXCLUSIVE lock on the relation being modified, preventing all operations on the relation in parallel. Those locks are getting more and more relaxed, with for example in Postgres 9.4 the following commands that got improvements:

Postgres 9.6 feature highlight - Replication slot improvements

2015-08-14 07:15:11 +0000

Today here are highlights about new features regarding replication slots that have been lately committed and will be present as part of PostgreSQL 9.6:

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Michael Paquier - PostgreSQL committer

Detection of COMMIT queries stuck because of synchronous replication in Postgres

Postgres 9.6 feature highlight - Lock names with trace_lwlocks

Postgres extension to retrieve file system information

Postgres 9.6 feature highlight - Lock reductions for ALTER TABLE SET

Postgres 9.6 feature highlight - Replication slot improvements

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