wpsimpletools

Shows default WP / PHP log file from admin interface, gives the possibility to erase it. 
Log viewer is accessible from WP ‘Tools’ menu.

Basic Log Viewer

Does what it says

Useful plugin

Shows default WP / PHP log file from admin interface, gives the possibility to erase it. Only works if debug mode is active.

shawfactor

This plugin logs all wordpress queries to a log file so you can review them later
Read the faq to learn more
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LH Log sql queries to file

Log all queries to a text file for development and debugging purposes

Basic Log Viewer vs LH Log sql queries to file