Fatal error in class-wpdb.php

My blog displays just fine and I can get into the dashboard but if I try anything else I get:

Fatal error: Allowed memory size of 805306368 bytes exhausted (tried to allocate 251658272 bytes) in (redacted)/public_html/wp-includes/class-wpdb.php on line 1533

The line: $query = vsprintf( $query, $args );

Any ideas where to look?

 

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