Hi, I think I found a bug in mysql. I tried the mysqlbug thing but it
didn't work right away. I hope this message will be detailed enough.
I am not subscribed to the mailing list.
In the following sections are the output of, respectively:
mysql -e "SHOW VARIABLES"
mysqldump sqmail sequence_data
mysql -e "EXPLAIN SELECT * FROM sqmail.sequence_data WHERE sid = 16
ORDER BY sid desc,id desc LIMIT 10"
The output of the last command contains "Using filesort" when it seems
like it shouldn't.
Variable_name Value
ansi_mode OFF
back_log 50
basedir /usr/
bdb_cache_size 8388600
bdb_log_buffer_size 32768
bdb_home /var/lib/mysql/
bdb_max_lock 10000
bdb_logdir
bdb_shared_data OFF
bdb_tmpdir /tmp/
bdb_version Sleepycat Software: Berkeley DB 3.2.9a: (May 9, 2001)
binlog_cache_size 32768
character_set latin1
character_sets latin1 big5 cp1251 cp1257 croat czech danish dec8 dos estonia euc_kr
gb2312 gbk german1 greek hebrew hp8 hungarian koi8_ru koi8_ukr latin2 latin5 swe7 usa7
win1250 win1251 win1251ukr ujis sjis tis620
concurrent_insert ON
connect_timeout 5
datadir /var/lib/mysql/
delay_key_write ON
delayed_insert_limit 100
delayed_insert_timeout 300
delayed_queue_size 1000
flush OFF
flush_time 0
have_bdb YES
have_gemini NO
have_innodb NO
have_isam YES
have_raid NO
have_ssl NO
init_file
interactive_timeout 28800
join_buffer_size 131072
key_buffer_size 8388600
language /usr/share/mysql/english/
large_files_support ON
locked_in_memory OFF
log OFF
log_update OFF
log_bin OFF
log_slave_updates OFF
long_query_time 10
low_priority_updates OFF
lower_case_table_names 0
max_allowed_packet 1048576
max_binlog_cache_size 4294967295
max_binlog_size 1073741824
max_connections 100
max_connect_errors 10
max_delayed_threads 20
max_heap_table_size 16777216
max_join_size 4294967295
max_sort_length 1024
max_user_connections 0
max_tmp_tables 32
max_write_lock_count 4294967295
myisam_recover_options OFF
myisam_max_extra_sort_file_size 256
myisam_max_sort_file_size 2047
myisam_sort_buffer_size 8388608
net_buffer_length 16384
net_read_timeout 30
net_retry_count 10
net_write_timeout 60
open_files_limit 0
pid_file /var/run/mysqld/mysqld.pid
port 3306
protocol_version 10
record_buffer 131072
query_buffer_size 0
safe_show_database OFF
server_id 0
skip_locking ON
skip_networking OFF
skip_show_database OFF
slow_launch_time 2
socket /var/lib/mysql/mysql.sock
sort_buffer 2097144
table_cache 64
table_type MYISAM
thread_cache_size 0
thread_stack 65536
transaction_isolation READ-COMMITTED
timezone PDT
tmp_table_size 1048576
tmpdir /tmp/
version 3.23.38
wait_timeout 28800
# MySQL dump 8.14
#
# Host: localhost Database: sqmail
#--------------------------------------------------------
# Server version 3.23.38
#
# Table structure for table 'sequence_data'
#
CREATE TABLE sequence_data (
sid int(10) unsigned NOT NULL default '0',
id int(10) unsigned NOT NULL default '0',
PRIMARY KEY (sid,id)
) TYPE=MyISAM;
#
# Dumping data for table 'sequence_data'
#
INSERT INTO sequence_data VALUES (1,1);
INSERT INTO sequence_data VALUES (1,2);
table type possible_keys key key_len ref rows Extra
sequence_data ref sidid sidid 4 const 1 where used; Using
index; Using filesort
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