The didn't show up on the list 2 days after posting it, so I'm posting it again.
---------- Forwarded message ----------
From: Mike Wexler <[EMAIL PROTECTED]>
Date: Fri, 22 Oct 2004 14:39:49 -0700
Subject: Very slow query
To: [EMAIL PROTECTED]
The following query:
CREATE TEMPORARY TABLE orders.recentClickOrders
SELECT recentHeader.transNum, recentClickLog.adRunId, links.letterId,
recentHeader.transactionTime
FROM orders.recentHeader, banner.recentClickLog, mailing_list.links
WHERE recentHeader.cookie=recentClickLog.cookie
AND recentClickLog.adRunId=links.adRunId
AND recentClickLog.cookie IS NOT NULL
explain says:
+----------------+------+----------------+---------+---------+------------------------+------+-------------+
| table | type | possible_keys | key | key_len | ref
| rows | Extra |
+----------------+------+----------------+---------+---------+------------------------+------+-------------+
| recentHeader | ALL | cookie | NULL | NULL | NULL
| 9456 | |
| recentClickLog | ref | adRunId,cookie | cookie | 256 |
recentHeader.cookie | 5 | Using where |
| links | ref | adRunId | adRunId | 4 |
recentClickLog.adRunId | 12 |
describe orders.recentHeader;
+-----------------+--------------+------+-----+---------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+--------------+------+-----+---------------------+-------+
| transNum | int(11) | | | 0 | |
| cookie | varchar(128) | YES | MUL | NULL | |
| transactionTime | datetime | | | 0000-00-00 00:00:00 | |
+-----------------+--------------+------+-----+---------------------+-------+
describe banner.recentClickLog;
+-----------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+------------------+------+-----+---------+-------+
| logKey | int(12) unsigned | | | 0 | |
| timeStamp | timestamp(14) | YES | | NULL | |
| adRunId | int(11) | | MUL | 0 | |
| cookie | varchar(255) | YES | MUL | NULL | |
| letterId | int(11) | | MUL | 0 | |
+-----------+------------------+------+-----+---------+-------+
describe mailing_list.links;
+----------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+------------------+------+-----+---------+----------------+
| linkId | int(12) unsigned | | PRI | NULL | auto_increment |
| letterId | int(11) | | MUL | 0 | |
| adRunId | int(11) | | MUL | 0 | |
+----------+------------------+------+-----+---------+----------------+
and
show keys from mailing_list.links;
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name |
Collation | Cardinality | Sub_part | Packed | Null | Index_type |
Comment |
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| links | 0 | PRIMARY | 1 | linkId | A
| 563158 | NULL | NULL | | BTREE | |
| links | 1 | adRunId | 1 | adRunId | A
| NULL | NULL | NULL | | BTREE | |
| links | 1 | letterId | 1 | letterId | A
| NULL | NULL | NULL | | BTREE | |
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
show keys from orders.recentHeader;
+--------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name |
Collation | Cardinality | Sub_part | Packed | Null | Index_type |
Comment |
+--------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| recentHeader | 1 | cookie | 1 | cookie |
A | 4728 | NULL | NULL | YES | BTREE |
|
+--------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
show keys from banner.recentClickLog;
+----------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name
| Collation | Cardinality | Sub_part | Packed | Null | Index_type |
Comment |
+----------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| recentClickLog | 1 | letterId | 1 | letterId
| A | 4 | NULL | NULL | | BTREE |
|
| recentClickLog | 1 | adRunId | 1 | adRunId
| A | 161 | NULL | NULL | | BTREE |
|
| recentClickLog | 1 | cookie | 1 | cookie
| A | 70112 | NULL | NULL | YES | BTREE |
|
+----------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
and
show status;
+--------------------------+------------+
| Variable_name | Value |
+--------------------------+------------+
| Aborted_clients | 40100 |
| Aborted_connects | 36 |
| Bytes_received | 457363285 |
| Bytes_sent | 3484164219 |
| Com_admin_commands | 9953963 |
| Com_alter_table | 258934 |
| Com_analyze | 0 |
| Com_backup_table | 0 |
| Com_begin | 0 |
| Com_change_db | 259 |
| Com_change_master | 0 |
| Com_check | 0 |
| Com_commit | 0 |
| Com_create_db | 1 |
| Com_create_function | 0 |
| Com_create_index | 0 |
| Com_create_table | 1666860 |
| Com_delete | 100908 |
| Com_delete_multi | 0 |
| Com_drop_db | 0 |
| Com_drop_function | 0 |
| Com_drop_index | 0 |
| Com_drop_table | 1114301 |
| Com_flush | 257 |
| Com_grant | 0 |
| Com_ha_close | 0 |
| Com_ha_open | 0 |
| Com_ha_read | 0 |
| Com_insert | 13432947 |
| Com_insert_select | 257491 |
| Com_kill | 17 |
| Com_load | 2 |
| Com_load_master_data | 0 |
| Com_load_master_table | 0 |
| Com_lock_tables | 252 |
| Com_optimize | 0 |
| Com_purge | 0 |
| Com_rename_table | 0 |
| Com_repair | 2 |
| Com_replace | 328400 |
| Com_replace_select | 0 |
| Com_reset | 0 |
| Com_restore_table | 0 |
| Com_revoke | 0 |
| Com_rollback | 0 |
| Com_savepoint | 0 |
| Com_select | 40562877 |
| Com_set_option | 9311979 |
| Com_show_binlog_events | 0 |
| Com_show_binlogs | 0 |
| Com_show_create | 16230 |
| Com_show_databases | 49 |
| Com_show_fields | 25467 |
| Com_show_grants | 0 |
| Com_show_keys | 9208 |
| Com_show_logs | 0 |
| Com_show_master_status | 0 |
| Com_show_new_master | 0 |
| Com_show_open_tables | 0 |
| Com_show_processlist | 78187 |
| Com_show_slave_hosts | 0 |
| Com_show_slave_status | 0 |
| Com_show_status | 130960 |
| Com_show_innodb_status | 0 |
| Com_show_tables | 16506 |
| Com_show_variables | 15 |
| Com_slave_start | 0 |
| Com_slave_stop | 0 |
| Com_truncate | 0 |
| Com_unlock_tables | 257 |
| Com_update | 5163103 |
| Connections | 1024902 |
| Created_tmp_disk_tables | 570308 |
| Created_tmp_tables | 2117221 |
| Created_tmp_files | 195 |
| Delayed_insert_threads | 0 |
| Delayed_writes | 0 |
| Delayed_errors | 0 |
| Flush_commands | 1 |
| Handler_commit | 0 |
| Handler_delete | 93163 |
| Handler_read_first | 2920280 |
| Handler_read_key | 1056100137 |
| Handler_read_next | 2282343339 |
| Handler_read_prev | 266770 |
| Handler_read_rnd | 357811101 |
| Handler_read_rnd_next | 1182457546 |
| Handler_rollback | 0 |
| Handler_update | 186790175 |
| Handler_write | 435888015 |
| Key_blocks_used | 498760 |
| Key_read_requests | 47290755 |
| Key_reads | 4493537 |
| Key_write_requests | 59326328 |
| Key_writes | 46525533 |
| Max_used_connections | 300 |
| Not_flushed_key_blocks | 1 |
| Not_flushed_delayed_rows | 0 |
| Open_tables | 3742 |
| Open_files | 6452 |
| Open_streams | 0 |
| Opened_tables | 4152273 |
| Questions | 73492318 |
| Qcache_queries_in_cache | 0 |
| Qcache_inserts | 0 |
| Qcache_hits | 0 |
| Qcache_lowmem_prunes | 0 |
| Qcache_not_cached | 0 |
| Qcache_free_memory | 0 |
| Qcache_free_blocks | 0 |
| Qcache_total_blocks | 0 |
| Rpl_status | NULL |
| Select_full_join | 1104537 |
| Select_full_range_join | 369 |
| Select_range | 936361 |
| Select_range_check | 0 |
| Select_scan | 4100201 |
| Slave_open_temp_tables | 0 |
| Slave_running | OFF |
| Slow_launch_threads | 2 |
| Slow_queries | 7974 |
| Sort_merge_passes | 61 |
| Sort_range | 2809596 |
| Sort_rows | 329971010 |
| Sort_scan | 3380980 |
| Table_locks_immediate | 91911640 |
| Table_locks_waited | 107862 |
| Threads_cached | 29 |
| Threads_created | 1404 |
| Threads_connected | 22 |
| Threads_running | 1 |
| Uptime | 2704214 |
+--------------------------+------------+
show variables;
| Variable_name | Value
|
+---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| back_log | 50
|
| basedir | /
|
| binlog_cache_size | 32768
|
| bulk_insert_buffer_size | 8388608
|
| character_set | latin1
|
| character_sets | latin1 big5 czech euc_kr gb2312
gbk latin1_de sjis tis620 ujis dec8 dos german1 hp8 koi8_ru latin2
swe7 usa7 cp1251 danish hebrew win1251 estonia hungarian koi8_ukr
win1251ukr greek win1250 croat cp1257 latin5 |
| concurrent_insert | ON
|
| connect_timeout | 5
|
| convert_character_set |
|
| datadir | /var/lib/mysql/
|
| default_week_format | 0
|
| delay_key_write | ON
|
| delayed_insert_limit | 100
|
| delayed_insert_timeout | 300
|
| delayed_queue_size | 1000
|
| flush | OFF
|
| flush_time | 0
|
| ft_boolean_syntax | + -><()~*:""&|
|
| ft_min_word_len | 3
|
| ft_max_word_len | 254
|
| ft_max_word_len_for_sort | 20
|
| ft_stopword_file |
|
| have_bdb | NO
|
| have_crypt | YES
|
| have_innodb | DISABLED
|
| have_isam | YES
|
| have_raid | NO
|
| have_symlink | YES
|
| have_openssl | NO
|
| have_query_cache | YES
|
| init_file |
|
| innodb_additional_mem_pool_size | 1048576
|
| innodb_buffer_pool_size | 8388608
|
| innodb_data_file_path |
|
| innodb_data_home_dir |
|
| innodb_file_io_threads | 4
|
| innodb_force_recovery | 0
|
| innodb_thread_concurrency | 8
|
| innodb_flush_log_at_trx_commit | 1
|
| innodb_fast_shutdown | ON
|
| innodb_flush_method |
|
| innodb_lock_wait_timeout | 50
|
| innodb_log_arch_dir |
|
| innodb_log_archive | OFF
|
| innodb_log_buffer_size | 1048576
|
| innodb_log_file_size | 5242880
|
| innodb_log_files_in_group | 2
|
| innodb_log_group_home_dir |
|
| innodb_mirrored_log_groups | 1
|
| innodb_max_dirty_pages_pct | 90
|
| interactive_timeout | 28800
|
| join_buffer_size | 1044480
|
| key_buffer_size | 536870912
|
| language | /usr/share/mysql/english/
|
| large_files_support | ON
|
| local_infile | ON
|
| locked_in_memory | OFF
|
| log | OFF
|
| log_update | OFF
|
| log_bin | OFF
|
| log_slave_updates | OFF
|
| log_slow_queries | ON
|
| log_warnings | OFF
|
| long_query_time | 2
|
| low_priority_updates | OFF
|
| lower_case_table_names | 0
|
| max_allowed_packet | 1047552
|
| max_binlog_cache_size | 4294967295
|
| max_binlog_size | 1073741824
|
| max_connections | 300
|
| max_connect_errors | 10
|
| max_delayed_threads | 20
|
| max_heap_table_size | 16777216
|
| max_join_size | 4294967295
|
| max_relay_log_size | 0
|
| max_seeks_for_key | 4294967295
|
| max_sort_length | 1024
|
| max_user_connections | 0
|
| max_tmp_tables | 32
|
| max_write_lock_count | 4294967295
|
| myisam_max_extra_sort_file_size | 268435456
|
| myisam_max_sort_file_size | 2147483647
|
| myisam_repair_threads | 1
|
| myisam_recover_options | BACKUP,FORCE
|
| myisam_sort_buffer_size | 67108864
|
| net_buffer_length | 16384
|
| net_read_timeout | 30
|
| net_retry_count | 10
|
| net_write_timeout | 60
|
| new | OFF
|
| open_files_limit | 8502
|
| pid_file |
/var/lib/mysql/carlstadt.lionbrand.com.pid
|
| log_error |
|
| port | 3306
|
| protocol_version | 10
|
| query_alloc_block_size | 8192
|
| query_cache_limit | 1048576
|
| query_cache_size | 0
|
| query_cache_type | ON
|
| query_prealloc_size | 8192
|
| range_alloc_block_size | 2048
|
| read_buffer_size | 2093056
|
| read_only | OFF
|
| read_rnd_buffer_size | 8384512
|
| rpl_recovery_rank | 0
|
| server_id | 1
|
| slave_net_timeout | 3600
|
| skip_external_locking | ON
|
| skip_networking | OFF
|
| skip_show_database | OFF
|
| slow_launch_time | 2
|
| socket | /tmp/mysql.sock
|
| sort_buffer_size | 4194296
|
| sql_mode | 0
|
| table_cache | 4096
|
| table_type | MYISAM
|
| thread_cache_size | 32
|
| thread_stack | 126976
|
| tx_isolation | REPEATABLE-READ
|
| timezone | PDT
|
| tmp_table_size | 16777216
|
| tmpdir | /tmp/
|
| transaction_alloc_block_size | 8192
|
| transaction_prealloc_size | 4096
|
| version | 4.0.18-standard-log
|
| version_comment | Official MySQL RPM
|
| wait_timeout | 28800
|
+---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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