UBB.Developers Forums Community Development Programming MySQL and Server Configuration my.cnf

OK - I have a new server with CPanel that I plan to resell some space on -

The my.cnf file is pretty empty:
[]
[mysqld]
set-variable = max_connections=500
[/]


This is my server:
AMD 2100 XP Athlon
1GB RAM
60 GB Hard Drive


I've looked at the my-medium & my-large - but not sure if I should just blindly put these in there - since I'll be reselling some space.

Any advice for settings I should tweak based on the hardware?

I will show you my my.cnf that has specs similar to yours, and it works flawlessly. Took a bit of tweaking and testing for a few days, but I think I have found the optimal config

[mysqld]
max_connections=500
skip-innodb
query_cache_limit = 1
query_cache_size = 32
query_cache_type = 1
interactive_timeout=100
wait_timeout=100
connect_timeout=10
thread_cache_size=128
key_buffer=16M
join_buffer=1M
max_allowed_packet=16M
table_cache=1024
record_buffer=1M
sort_buffer_size=2M
read_buffer_size=2M
max_connect_errors=10

Now.. one more thing to note which is fairly important, but I assume you are using mysql4 correct? Because the query_cache is new to 4, so if you were using 3, it would be pointless to add those.

there are other options you can setup as well to tweak things like mysqldump and databsae repairing and such in this file... but the options I choose there will give you hopefully the most performance improvements up front.

Thank you.

Mine had "set-varibale" in front of it. Is that not needed.

Do you just need to restart mySQL for that to take effect?

set-varibale can be removed in MySQL 4, and yes, you will need to restart mysqld for the changes to take effect.

Cool.
Yeah, I've got mysql 4.0.12.

Cpanel/WebHostmanager made it easy to upgrade. I had to upgrade Apache out of the gate - but it was easy.

Thanks for the help.

No problem, and you may see better results with these values.. each machine is different so it is hard to say But these values also work very well on a single CPU with 1GB of ram, too large of cache files can hurt more than they help.. but with so many other factors, you won't know until you try

thread_cache_size=80
key_buffer=150M
table_cache=512
sort_buffer_size=1M
read_buffer_size=1M
read_rnd_buffer_size=768K
thread_concurrency=2

Thanks. I'll pay attention as I actually put some sites on the server. And tweak as needed.

I appreciate the advice.

OK - more help. On another server.

Here is the my.cnf file that they had:
[]
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

[mysql.server]
user=mysql
basedir=/var/lib

[safe_mysqld]
err-log=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[/]

And this is the server's specs:

DELL DUAL XEON - 2.0Ghz -
(2) 73 GB HD
1 GBRAM

Any changes I should make. Not really using the server yet - but thought I'd try to get MySQL tuned right first.

http://www.mysql.com/doc/en/SHOW_VARIABLES.html
http://www.mysql.com/doc/en/SHOW_STATUS.html

Some comments about the above:

If Opened_tables is big, then your table_cache variable is probably too small.
If Key_reads is big, then your key_buffer_size variable is probably too small. The cache miss rate can be calculated with Key_reads/Key_read_requests.
If Handler_read_rnd is big, then you probably have a lot of queries that require MySQL to scan whole tables or you have joins that don't use keys properly.
If Threads_created is big, you may want to increase the thread_cache_size variable. The cache hit rate can be calculated with Threads_created/Connections.
If Created_tmp_disk_tables is big, you may want to increase the tmp_table_size variable to get the temporary tables memory-based instead of disk based.

==============
it seems to me that most of the above problems occur in my case.
I have a dual PII 600 with 256 meg memory, 30-50 concurrent users at most times.

** I dont quite understand why
query_cache_limit = 1
query_cache_size = 32
query_cache_type = 1

but seems in the server query_cache_size is zero. Maybe it does not read my my.cnf file? I did a myslq stop and mysql start in /etc/rc.d/init.d (linux)

Is the file type ok? myisam?? Any other problem that might be lurking? maybe bad upgrade that forgot an index??


===============
[mario@a3p etc]$ cat /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

max_connections=500
skip-innodb
query_cache_limit = 1
query_cache_size = 32
query_cache_type = 1
interactive_timeout=100
wait_timeout=100
connect_timeout=10
thread_cache_size=128
key_buffer=16M
join_buffer=1M
max_allowed_packet=16M
table_cache=1024
record_buffer=1M
sort_buffer_size=2M
read_buffer_size=2M
max_connect_errors=10





[mysql.server]
user=mysql
basedir=/var/lib

[safe_mysqld]
err-log=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[mario@a3p etc]$
[mario@a3p etc]$ x
==================
mysql> 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 | 10 |
| convert_character_set | |
| 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 |
| ft_boolean_syntax | + -><()~*:""&| |
| ft_min_word_len | 4 |
| ft_max_word_len | 254 |
| ft_max_word_len_for_sort | 20 |
| ft_stopword_file | (built-in) |
| 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 | 100 |
| join_buffer_size | 1044480 |
| key_buffer_size | 16777216 |
| 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 | OFF |
| log_warnings | OFF |
| long_query_time | 10 |
| low_priority_updates | OFF |
| lower_case_table_names | OFF |
| max_allowed_packet | 16776192 |
| max_binlog_cache_size | 4294967295 |
| max_binlog_size | 1073741824 |
| max_connections | 500 |
| 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_max_extra_sort_file_size | 268435456 |
| myisam_max_sort_file_size | 2147483647 |
| myisam_repair_threads | 1 |
| myisam_recover_options | OFF |
| myisam_sort_buffer_size | 8388608 |
| net_buffer_length | 16384 |
| net_read_timeout | 30 |
| net_retry_count | 10 |
| net_write_timeout | 60 |
| new | OFF |
| open_files_limit | 0 |
| pid_file | /var/lib/mysql/a3p.a3p.com.pid |
| log_error | |
| port | 3306 |
| protocol_version | 10 |
| read_buffer_size | 2093056 |
| read_rnd_buffer_size | 262144 |
| rpl_recovery_rank | 0 |
| query_cache_limit | 1 |
| query_cache_size | 0 |
| query_cache_type | ON |
| server_id | 0 |
| slave_net_timeout | 3600 |
| skip_external_locking | ON |
| skip_networking | OFF |
| skip_show_database | OFF |
| slow_launch_time | 2 |
| socket | /var/lib/mysql/mysql.sock |
| sort_buffer_size | 2097144 |
| sql_mode | 0 |
| table_cache | 1024 |
| table_type | MYISAM |
| thread_cache_size | 128 |
| thread_stack | 126976 |
| tx_isolation | REPEATABLE-READ |
| timezone | EDT |
| tmp_table_size | 33554432 |
| tmpdir | /tmp/ |
| version | 4.0.13 |
| wait_timeout | 100 |
+---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
117 rows in set (0.00 sec)
=====================================
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2661 to server version: 4.0.13

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> show status;
+--------------------------+-----------+
| Variable_name | Value |
+--------------------------+-----------+
| Aborted_clients | 2165 |
| Aborted_connects | 0 |
| Bytes_received | 81226012 |
| Bytes_sent | 328805911 |
| Com_admin_commands | 0 |
| Com_alter_table | 0 |
| Com_analyze | 0 |
| Com_backup_table | 0 |
| Com_begin | 0 |
| Com_change_db | 14463 |
| Com_change_master | 0 |
| Com_check | 0 |
| Com_commit | 0 |
| Com_create_db | 0 |
| Com_create_function | 0 |
| Com_create_index | 0 |
| Com_create_table | 0 |
| Com_delete | 4861 |
| Com_delete_multi | 0 |
| Com_drop_db | 0 |
| Com_drop_function | 0 |
| Com_drop_index | 0 |
| Com_drop_table | 0 |
| Com_flush | 0 |
| Com_grant | 0 |
| Com_ha_close | 0 |
| Com_ha_open | 0 |
| Com_ha_read | 0 |
| Com_insert | 3402 |
| Com_insert_select | 0 |
| Com_kill | 0 |
| Com_load | 0 |
| Com_load_master_data | 0 |
| Com_load_master_table | 0 |
| Com_lock_tables | 1 |
| Com_optimize | 3 |
| Com_purge | 0 |
| Com_rename_table | 0 |
| Com_repair | 0 |
| Com_replace | 14255 |
| Com_replace_select | 0 |
| Com_reset | 0 |
| Com_restore_table | 0 |
| Com_revoke | 0 |
| Com_rollback | 0 |
| Com_select | 149555 |
| Com_set_option | 18 |
| Com_show_binlog_events | 0 |
| Com_show_binlogs | 0 |
| Com_show_create | 18 |
| Com_show_databases | 0 |
| Com_show_fields | 18 |
| Com_show_grants | 0 |
| Com_show_keys | 0 |
| Com_show_logs | 0 |
| Com_show_master_status | 0 |
| Com_show_new_master | 0 |
| Com_show_open_tables | 0 |
| Com_show_processlist | 0 |
| Com_show_slave_hosts | 0 |
| Com_show_slave_status | 0 |
| Com_show_status | 13941 |
| Com_show_innodb_status | 0 |
| Com_show_tables | 1 |
| Com_show_variables | 2 |
| Com_slave_start | 0 |
| Com_slave_stop | 0 |
| Com_truncate | 0 |
| Com_unlock_tables | 0 |
| Com_update | 14718 |
| Connections | 2663 |
| Created_tmp_disk_tables | 341 |
| Created_tmp_tables | 11948 |
| Created_tmp_files | 10 |
| Delayed_insert_threads | 0 |
| Delayed_writes | 0 |
| Delayed_errors | 0 |
| Flush_commands | 1 |
| Handler_commit | 0 |
| Handler_delete | 4466 |
| Handler_read_first | 1116 |
| Handler_read_key | 507346 |
| Handler_read_next | 265654814 |
| Handler_read_prev | 285045 |
| Handler_read_rnd | 1099965 |
| Handler_read_rnd_next | 4047770 |
| Handler_rollback | 0 |
| Handler_update | 234038 |
| Handler_write | 34513 |
| Key_blocks_used | 15586 |
| Key_read_requests | 8554464 |
| Key_reads | 28379 |
| Key_write_requests | 65199 |
| Key_writes | 35567 |
| Max_used_connections | 33 |
| Not_flushed_key_blocks | 0 |
| Not_flushed_delayed_rows | 0 |
| Open_tables | 69 |
| Open_files | 87 |
| Open_streams | 0 |
| Opened_tables | 116 |
| Questions | 201794 |
| 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 | 0 |
| Select_full_range_join | 0 |
| Select_range | 4425 |
| Select_range_check | 0 |
| Select_scan | 23061 |
| Slave_open_temp_tables | 0 |
| Slave_running | OFF |
| Slow_launch_threads | 0 |
| Slow_queries | 290 |
| Sort_merge_passes | 0 |
| Sort_range | 52948 |
| Sort_rows | 4123249 |
| Sort_scan | 22924 |
| Table_locks_immediate | 188411 |
| Table_locks_waited | 9910 |
| Threads_cached | 14 |
| Threads_created | 34 |
| Threads_connected | 20 |
| Threads_running | 1 |
| Uptime | 37865 |
+--------------------------+-----------+
131 rows in set (0.02 sec)

mysql> flush tables;
ERROR 2006: MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 2712
Current database: *** NONE ***

Query OK, 0 rows affected (0.06 sec)

mysql> show status;
+--------------------------+-----------+
| Variable_name | Value |
+--------------------------+-----------+
| Aborted_clients | 2215 |
| Aborted_connects | 0 |
| Bytes_received | 82468714 |
| Bytes_sent | 331280816 |
| Com_admin_commands | 0 |
| Com_alter_table | 0 |
| Com_analyze | 0 |
| Com_backup_table | 0 |
| Com_begin | 0 |
| Com_change_db | 14669 |
| Com_change_master | 0 |
| Com_check | 0 |
| Com_commit | 0 |
| Com_create_db | 0 |
| Com_create_function | 0 |
| Com_create_index | 0 |
| Com_create_table | 0 |
| Com_delete | 4929 |
| Com_delete_multi | 0 |
| Com_drop_db | 0 |
| Com_drop_function | 0 |
| Com_drop_index | 0 |
| Com_drop_table | 0 |
| Com_flush | 1 |
| Com_grant | 0 |
| Com_ha_close | 0 |
| Com_ha_open | 0 |
| Com_ha_read | 0 |
| Com_insert | 3453 |
| Com_insert_select | 0 |
| Com_kill | 0 |
| Com_load | 0 |
| Com_load_master_data | 0 |
| Com_load_master_table | 0 |
| Com_lock_tables | 1 |
| Com_optimize | 3 |
| Com_purge | 0 |
| Com_rename_table | 0 |
| Com_repair | 0 |
| Com_replace | 14459 |
| Com_replace_select | 0 |
| Com_reset | 0 |
| Com_restore_table | 0 |
| Com_revoke | 0 |
| Com_rollback | 0 |
| Com_select | 151738 |
| Com_set_option | 18 |
| Com_show_binlog_events | 0 |
| Com_show_binlogs | 0 |
| Com_show_create | 18 |
| Com_show_databases | 0 |
| Com_show_fields | 18 |
| Com_show_grants | 0 |
| Com_show_keys | 0 |
| Com_show_logs | 0 |
| Com_show_master_status | 0 |
| Com_show_new_master | 0 |
| Com_show_open_tables | 0 |
| Com_show_processlist | 0 |
| Com_show_slave_hosts | 0 |
| Com_show_slave_status | 0 |
| Com_show_status | 14143 |
| Com_show_innodb_status | 0 |
| Com_show_tables | 1 |
| Com_show_variables | 2 |
| Com_slave_start | 0 |
| Com_slave_stop | 0 |
| Com_truncate | 0 |
| Com_unlock_tables | 0 |
| Com_update | 14955 |
| Connections | 2715 |
| Created_tmp_disk_tables | 351 |
| Created_tmp_tables | 12131 |
| Created_tmp_files | 10 |
| Delayed_insert_threads | 0 |
| Delayed_writes | 0 |
| Delayed_errors | 0 |
| Flush_commands | 2 |
| Handler_commit | 0 |
| Handler_delete | 4539 |
| Handler_read_first | 1129 |
| Handler_read_key | 513855 |
| Handler_read_next | 268818314 |
| Handler_read_prev | 285153 |
| Handler_read_rnd | 1117897 |
| Handler_read_rnd_next | 4073775 |
| Handler_rollback | 0 |
| Handler_update | 237286 |
| Handler_write | 35023 |
| Key_blocks_used | 15586 |
| Key_read_requests | 8638064 |
| Key_reads | 28887 |
| Key_write_requests | 66218 |
| Key_writes | 36105 |
| Max_used_connections | 33 |
| Not_flushed_key_blocks | 0 |
| Not_flushed_delayed_rows | 0 |
| Open_tables | 13 |
| Open_files | 23 |
| Open_streams | 0 |
| Opened_tables | 129 |
| Questions | 204750 |
| 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 | 0 |
| Select_full_range_join | 0 |
| Select_range | 4468 |
| Select_range_check | 0 |
| Select_scan | 23397 |
| Slave_open_temp_tables | 0 |
| Slave_running | OFF |
| Slow_launch_threads | 0 |
| Slow_queries | 290 |
| Sort_merge_passes | 0 |
| Sort_range | 53674 |
| Sort_rows | 4196111 |
| Sort_scan | 23263 |
| Table_locks_immediate | 191304 |
| Table_locks_waited | 9938 |
| Threads_cached | 17 |
| Threads_created | 34 |
| Threads_connected | 17 |
| Threads_running | 1 |
| Uptime | 38585 |
+--------------------------+-----------+
131 rows in set (0.00 sec)

mysql> show status;
+--------------------------+-----------+
| Variable_name | Value |
+--------------------------+-----------+
| Aborted_clients | 2216 |
| Aborted_connects | 0 |
| Bytes_received | 82552734 |
| Bytes_sent | 331473570 |
| Com_admin_commands | 0 |
| Com_alter_table | 0 |
| Com_analyze | 0 |
| Com_backup_table | 0 |
| Com_begin | 0 |
| Com_change_db | 14682 |
| Com_change_master | 0 |
| Com_check | 0 |
| Com_commit | 0 |
| Com_create_db | 0 |
| Com_create_function | 0 |
| Com_create_index | 0 |
| Com_create_table | 0 |
| Com_delete | 4932 |
| Com_delete_multi | 0 |
| Com_drop_db | 0 |
| Com_drop_function | 0 |
| Com_drop_index | 0 |
| Com_drop_table | 0 |
| Com_flush | 1 |
| Com_grant | 0 |
| Com_ha_close | 0 |
| Com_ha_open | 0 |
| Com_ha_read | 0 |
| Com_insert | 3456 |
| Com_insert_select | 0 |
| Com_kill | 0 |
| Com_load | 0 |
| Com_load_master_data | 0 |
| Com_load_master_table | 0 |
| Com_lock_tables | 1 |
| Com_optimize | 3 |
| Com_purge | 0 |
| Com_rename_table | 0 |
| Com_repair | 0 |
| Com_replace | 14472 |
| Com_replace_select | 0 |
| Com_reset | 0 |
| Com_restore_table | 0 |
| Com_revoke | 0 |
| Com_rollback | 0 |
| Com_select | 151885 |
| Com_set_option | 18 |
| Com_show_binlog_events | 0 |
| Com_show_binlogs | 0 |
| Com_show_create | 18 |
| Com_show_databases | 0 |
| Com_show_fields | 18 |
| Com_show_grants | 0 |
| Com_show_keys | 0 |
| Com_show_logs | 0 |
| Com_show_master_status | 0 |
| Com_show_new_master | 0 |
| Com_show_open_tables | 0 |
| Com_show_processlist | 0 |
| Com_show_slave_hosts | 0 |
| Com_show_slave_status | 0 |
| Com_show_status | 14157 |
| Com_show_innodb_status | 0 |
| Com_show_tables | 1 |
| Com_show_variables | 2 |
| Com_slave_start | 0 |
| Com_slave_stop | 0 |
| Com_truncate | 0 |
| Com_unlock_tables | 0 |
| Com_update | 14970 |
| Connections | 2718 |
| Created_tmp_disk_tables | 351 |
| Created_tmp_tables | 12143 |
| Created_tmp_files | 10 |
| Delayed_insert_threads | 0 |
| Delayed_writes | 0 |
| Delayed_errors | 0 |
| Flush_commands | 2 |
| Handler_commit | 0 |
| Handler_delete | 4542 |
| Handler_read_first | 1129 |
| Handler_read_key | 514245 |
| Handler_read_next | 268955608 |
| Handler_read_prev | 285153 |
| Handler_read_rnd | 1119232 |
| Handler_read_rnd_next | 4074272 |
| Handler_rollback | 0 |
| Handler_update | 237450 |
| Handler_write | 35055 |
| Key_blocks_used | 15586 |
| Key_read_requests | 8642738 |
| Key_reads | 28957 |
| Key_write_requests | 66269 |
| Key_writes | 36130 |
| Max_used_connections | 33 |
| Not_flushed_key_blocks | 0 |
| Not_flushed_delayed_rows | 0 |
| Open_tables | 13 |
| Open_files | 23 |
| Open_streams | 0 |
| Opened_tables | 129 |
| Questions | 204945 |
| 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 | 0 |
| Select_full_range_join | 0 |
| Select_range | 4471 |
| Select_range_check | 0 |
| Select_scan | 23420 |
| Slave_open_temp_tables | 0 |
| Slave_running | OFF |
| Slow_launch_threads | 0 |
| Slow_queries | 290 |
| Sort_merge_passes | 0 |
| Sort_range | 53728 |
| Sort_rows | 4201492 |
| Sort_scan | 23286 |
| Table_locks_immediate | 191493 |
| Table_locks_waited | 9941 |
| Threads_cached | 15 |
| Threads_created | 34 |
| Threads_connected | 19 |
| Threads_running | 1 |
| Uptime | 38618 |
+--------------------------+-----------+
131 rows in set (0.00 sec)

please use persistent connections.

[] Most MySQL distributions come with four sample configuration files:

my-huge.cnf For systems with more than 1GB memory that are mostly dedicated to MySQL.

my-large.cnf For systems with at least 512MB memory that are mostly dedicated to MySQL.

my-medium.cnf For systems with at least 32MB memory dedicated entirely to MySQL or with at least 128MB on a machine that serves multiple purposes (such as a dual web/database server).

my-small.cnf For systems with less than 64MB memory where MySQL cannot take up too much of the resources.

[/]

hello

whenever i put those variable in my.cnf file, the mysqld wont run. there is no error message, it just won't run.

any experience?

Which variables?