Logs on it-grossniklaus.ch

Binary Logs

Mon, 01 Jan 0001 00:00:00 +0000

SHOW BINARY LOGS;
PURGE BINARY LOGS TO 'mysql-bin.000nnn';
PURGE BINARY LOGS BEFORE '2015-04-10 22:46:26';

SET GLOBAL expire_logs_days=5;
FLUSH LOGS;

SHOW BINLOG EVENTS LIMIT 0,30;
SHOW BINLOG EVENTS IN 'mysql-bin.000nn' LIMIT 10;

mysqlbinlog /var/lib/mysql/mysqld-relay-bin.000140 | tail -20

cd $HOME/tmp
for file in /var/log/mysql/mysql-bin.00nnn*; do
    echo "mysqlbinlog $file > " $(basename $file).txt;
done

cd $HOME/tmp
for file in /var/lib/mysql/mysqld-relay-bin.00nnn*; do
    echo "mysqlbinlog $file > " $(basename $file).txt;
done

Flush

Mon, 01 Jan 0001 00:00:00 +0000

FLUSH TABLES

FLUSH LOGS;
FLUSH TABLES WITH READ LOCK;
UNLOCK TABLES;

Transaction => Binlog Flush

innodb_flush_log_at_trx_commit=1

The default value of 1 is required for full ACID compliance. With this value, the log buffer is written out to the log file at each transaction commit and the flush to disk operation is performed on the log file.

innodb_flush_log_at_trx_commit=0

With a value of 0, any mysqld process crash can erase the last second of transactions. The log buffer is written out to the log file once per second and the flush to disk operation is performed on the log file, but nothing is done at a transaction commit.

Slow Log

Mon, 01 Jan 0001 00:00:00 +0000

mysqldumpslow -t 100 /var/log/mysql/mysql-slow.log

SET GLOBAL slow_query_log =off;
FLUSH LOGS;
TRUNCATE mysql.slow_log;
SET GLOBAL slow_query_log =on;

SET GLOBAL long_query_time = 1;
SET GLOBAL log_queries_not_using_indexes=off;

SQL loggen

Mon, 01 Jan 0001 00:00:00 +0000

# neues slow log beginnen
logrotate -f /etc/logrotate.d/mysql-server

SHOW GLOBAL VARIABLES like "%long_query_time%";
SET GLOBAL long_query_time=0;

-- so lange warten wie man will
SET GLOBAL long_query_time=1;
SHOW GLOBAL VARIABLES like "%long_query_time%";

# neues slow log beginnen
logrotate -f /etc/logrotate.d/mysql-server