Connect to AWS Aurora PostgreSQL/Amazon Redshift Database from AWS Lambda

In this blog post I will discuss following scenarios to connect to databases from AWS Lambda function: Connecting to Amazon Aurora PostgreSQL database in private subnet with public accessibility set to No in same AWS account.Connecting to cross account Amazon Redshift database in public subnet with public accessibility set to Yes. Connect to Amazon Aurora …

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PostgreSQL – LWLock:multixact_offset

On one of the PostgreSQL db , the active sessions were waiting on IO:SLRURead and LWLock:multixact_offset causing application latency. As per PostgreSQL doc, SLRURead is waiting for a read of an SLRU page and multixact_offset is waiting for I/O on a multixact offset buffer. Diagnosing the issue took some time so cut to the chase …

PostgreSQL – CPU Utilization and Index

One of the Production Aurora PostgreSQL instance running on db.r4.16xlarge instance (64 vCPU and 488 GB ) was reporting high CPU Utilization spiking upto 100%. With such issues, one of the first thing is to look for the SQLs with high buffers shared hit. I have built a small tool called pgsnap which is something …