Hi Serg,
On Sat, Nov 29, 2014 at 1:54 PM, Sergei Golubchik
Hi, Nirbhay!
On Nov 28, nirbhay@mariadb.com wrote:
revision-id: 7a5559421f4f3dda44d04bf946e79661d09b4dc2 parent(s): 7b55b67de5fdfe91283357fe6c7ccc3f9e355925 committer: Nirbhay Choubey branch nick: b4412 timestamp: 2014-11-28 20:53:02 -0500 message:
MDEV-4412 : SLOW QUERY LOG - add affected rows (UPDATE / DELETE) in slow query log
Added Rows_affected to slow query log & mysql.slow_log table.
Just a couple of comments:
diff --git a/scripts/mysql_system_tables_fix.sql b/scripts/mysql_system_tables_fix.sql index b9bb59c..4973dc9 100644 --- a/scripts/mysql_system_tables_fix.sql +++ b/scripts/mysql_system_tables_fix.sql @@ -262,7 +262,8 @@ ALTER TABLE slow_log MODIFY insert_id INTEGER NOT NULL, MODIFY server_id INTEGER UNSIGNED NOT NULL, MODIFY sql_text MEDIUMTEXT NOT NULL, - MODIFY thread_id BIGINT(21) UNSIGNED NOT NULL; + MODIFY thread_id BIGINT(21) UNSIGNED NOT NULL, + MODIFY rows_affected INTEGER NOT NULL;
Eh? That makes no sense. This file is for mysql_upgrade. Your ALTER TABLE would help if there was some MariaDB version where rows_affected column would've been nullable and you wanted to change it to NOT NULL. But there was no such MariaDB version. There was MariaDB version without rows_affected column at all. So, instead of this MODIFY rows_affected, you need to put another ALTER TABLE statement that adds rows_affected INTEGER NOT NULL column.
Right, I have fixed this.
SET GLOBAL slow_query_log = @old_log_state;
ALTER TABLE plugin diff --git a/sql/log.cc b/sql/log.cc index ff04105..24e5283 100644 --- a/sql/log.cc +++ b/sql/log.cc @@ -2918,12 +2924,16 @@ bool MYSQL_QUERY_LOG::write(THD *thd, time_t current_time, sprintf(lock_time_buff, "%.6f", ulonglong2double(lock_utime)/1000000.0); if (my_b_printf(&log_file, "# Thread_id: %lu Schema: %s QC_hit: %s\n" \ - "# Query_time: %s Lock_time: %s Rows_sent: %lu Rows_examined: %lu\n", + "# Query_time: %s Lock_time: %s Rows_sent: %lu Rows_examined: %lu\n" \ + "# Rows_affected: %lu\n",
I'd rather have Rows_affected on the same line with Rows_sent and Rows_examined
Based on how mysqldumpslow parses the slow log file, IMO adding a new attribute to the same line may render the existing line non-parsable to older versions. I also had to make a tiny modification to the script for it to consider "QC_hit:". Best, Nirbhay
(ulong) thd->thread_id, (thd->db ? thd->db : ""), ((thd->query_plan_flags & QPLAN_QC) ? "Yes" : "No"), query_time_buff, lock_time_buff, (ulong) thd->get_sent_row_count(), - (ulong) thd->get_examined_row_count()) == (size_t)
-1)
+ (ulong) thd->get_examined_row_count(), + thd->get_stmt_da()->is_ok() ? + (ulong) thd->get_stmt_da()->affected_rows() : + 0) == (size_t) -1) tmp_errno= errno; if ((thd->variables.log_slow_verbosity & LOG_SLOW_VERBOSITY_QUERY_PLAN) && (thd->query_plan_flags &
Regards, Sergei