PostgreSQL

Drilling down the pgSentinel Active Session History

By Franck Pachot . In pgSentinel: the sampling approach for PostgreSQL I mentioned that one of the advantages of the ASH approach is the ability to drill down from an overview of the database activity,(…)

pgSentinel: the sampling approach for PostgreSQL

By Franck Pachot . Here is the first test I did with the beta of pgSentinel. This Active Session History sampling is a new approach to Postgres tuning. For people coming from Oracle, this is something(…)

PGIO, PG_STAT_ACTIVITY and PG_STAT_STATEMENTS

By Franck Pachot . For an Oracle DBA, we are used to join active sessions (from V$SESSION where status='ACTIVE) with active statements (from V$SQL where users_executing>0) on the SQL_ID. V$ACTIVE_SESSION_HISTORY also displays the TOP_LEVEL_SQL_ID to get the entrypoint of the(…)

Lighty for PostgreSQL

By Franck Pachot . If you follow this blog, you should know how I like Orachrome Lighty for Oracle, for its efficiency to monitor database performance statistics. Today Orachrome released the beta version of Lighty for Postgres:(…)

Which Bitnami service to choose in the Oracle Cloud Infrastructure?

By Franck Pachot . In the Oracle Cloud PaaS you have a marketplace where you can choose your service. Some are packaged from Bitnami and available on multiple OS. My first idea is that in PaaS you do not care(…)

Postgres, the fsync() issue, and ‘pgio’ (the SLOB method for PostgreSQL)

By Franck Pachot . That's a long blog post title, which is actually just a good pretext to play with Kevin Closson SLOB method for PostgreSQL: pgio I use the beta version of pgio here. If you want to read(…)

PostgreSQL – logical replication with pglogical

Although PostgreSQL 10 integrate native logical replication (have a look here or here), it is always interesting to be aware of alternative solutions to the available in-core features. One of those is called(…)

Full page logging in Postgres and Oracle

By Franck Pachot . In my opinion, the volume of logging (aka redo log, aka xlog, aka WAL) is the most important factor for OLTP performance, availability and scalability, for several reasons: This is the only structure where disk latency(…)

Server process name in Postgres and Oracle

By Franck Pachot . Every database analysis should start with system load analysis. If the host is in CPU starvation, then looking at other statistics can be pointless. With ‘top’ on Linux, or equivalent such as process explorer on(…)

Postgres vs. Oracle access paths XI – Sample Scan

By Franck Pachot . I was going to end this series with the previous post because the last access path available in Postgres is a bit special: a Seq Scan that returns only a sample of(…)