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large table indexing problem
Posted by: geonjae yu
Date: January 26, 2012 08:12PM

Hi,

I had run the alter table command to add index on a large table - MyISAM, about 70million rows, 12GB file size - 2 day ago.
but, this command is running for 171735 seconds as below.
Connect 172299 copy to tmp table alter table Results_a04_20120118 add index idxCpc(cpcCode)

most cpu is idling, 10GB free memory... load average 1.00, 1.00, 1.00

Strangely, when I restart mysql, running time is shortened considerably.

Partitioning is not used.

Please help me!!

MySQL Server version is 5.1.55 Source distribution.

The system is
2.13Gh x 2 cpu(4cores), total 8 core,
64GB memory,
2TB SATA x 10 (RAID 5)

my.cnf is
[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld_safe]
open-files-limit = 8192
[mysqld]
skip-name-resolve
skip-external-locking
skip-character-set-client-handshake
default-storage-engine = MyISAM
character-set-server = utf8
collation-server = utf8_general_ci
event_scheduler = on
general-log = 0
slow-query-log = 0
long_query_time = 5
back_log = 100
max_connections = 500
max_connect_errors = 500
connect_timeout = 30
wait_timeout = 30
max_allowed_packet = 64M
max_heap_table_size = 128M
tmp_table_size = 128M
join_buffer_size = 16M
read_buffer_size = 16M
sort_buffer_size = 32M
read_rnd_buffer_size = 32M
thread_cache_size = 16
thread_concurrency = 16
table_cache = 2048
query_cache_type = 1
query_cache_size = 128M
concurrent_insert = 1
key_buffer_size = 6G
bulk_insert_buffer_size = 32M
myisam_sort_buffer_size = 1G
delay-key-write = OFF
ignore-builtin-innodb
plugin-load=innodb=ha_innodb_plugin.so
innodb_buffer_pool_size = 1G
innodb_additional_mem_pool_size = 32M
innodb_file_io_threads = 4
innodb_thread_concurrency = 8
innodb_log_buffer_size = 1M
innodb_log_file_size = 256M
innodb_log_files_in_group = 2
innodb_lock_wait_timeout = 30
innodb_max_dirty_pages_pct = 90
innodb_flush_log_at_trx_commit = 2
sync_binlog = 0
[mysqldump]
quick
max_allowed_packet = 64M
[mysql]
no-auto-rehash
[isamchk]
key_buffer = 128M
sort_buffer_size = 2M
read_buffer = 2M
write_buffer = 2M
[myisamchk]
key_buffer = 2G
sort_buffer_size = 1G
read_buffer = 1G
write_buffer = 256M
[mysqlhotcopy]
interactive-timeout



Edited 5 time(s). Last edit at 01/26/2012 06:30PM by geonjae yu.

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