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kyle Hailey

Metrics vs Statistics

Here are the tuning metrics tables (SQL stats are not in “metric” tables per say) (*DBA_HIST_…_HISTORY views are sort of confusing....

kyle Hailey

Wait Metrics vs Wait Events

Here is a quick table comparison of different types of metrics views The first line of the table is the classic wait event and statistic...

kyle Hailey

Enqueue – PK, FK or Bitmap Index problem?

Primary/Unique Key: inserting a unique key when someone else has already inserted that key but not committed Foreign Key: Inserting a...

kyle Hailey

Oracle I/O latency monitoring

db file sequential read db file scattered read log file parallel write direct path reads direct path reads temp Of course it would be...

kyle Hailey

CURSOR_SHARING : a picture is worth a 1000 words

Anyone who has been around Oracle performance over the years knows the grief that hard parsing SQL queries can cause on highly concurrent...

kyle Hailey

Oracle CPU Time

Image from Bertrand Drouvot UPDATE: thanks to a discussion in the comments it’s come to my attention that there should be some more...

kyle Hailey

Where to begin with Oracle and SQL

Here is my list and everything on this list is excellent. I’m sure I missed a few good ones, but maybe people can add them in the...

kyle Hailey

TCP Trace Analysis for NFS

How do we know where latency comes from when there is a disparity in reported I/O latency on the I/O subsystem and that of the latency...

kyle Hailey

Oracle time units in V$ views

Oracle has a crazy mix of units of time in various v$ views seconds centi-seconds milliseconds microseconds Some are straight forward...