Hello, I have the same "expr" logs going to file AND sql. With file-only logging it works great. When I'm enabling SQL logging it stops writing both to file and to sql ~1-10min(from 10 000 to 200 000 lines) after start. Every time there are no dropped messages, but 1000 stored for SQL location. syslog-ng 3.3.6 - number of nodes: ~150 - max-connections(200) - log_iw_size(20000) - log_fetch_limit(100) - log_fifo_size (400000); - flush_lines(100) - flush_timeout(100) - flags(flow-control) # the same issue with and without flow control syslog-server ~ % sudo syslog-ng-ctl stats | sort -rnk6 -t ";" | grep expr dst.file;d_app_expr#0;/logs/app/expr.log;o;processed;30457 destination;d_app_expr;;a;processed;30457 destination;d_mysql_expr;;a;processed;30003 * dst.sql;d_mysql_expr#0;mysql,mysql-db-ip,port,syslog_production,expr_${HOST}_${R_Y;a;stored;1000 * dst.sql;d_mysql_expr#0;mysql,mysql-db-ip,port,syslog_production,expr_${HOST}_${R_Y;a;dropped;0 dst.file;d_app_expr#0;/logs/app/expr.log;o;stored;0 dst.file;d_app_expr#0;/logs/app/expr.log;o;dropped;0 I see no errors in syslog-ng debug logs or mysql error log. After restarting syslog-ng it writes both logs for some time and stops again. I will appreciate any help. Additional question: is there any mysqltuner.pl-like tool for syslog-ng? I don't feel happy to tune all those buffers and windows manually with no being sure it will help. -- Best regards, Koldaev Anton