MySQL 5.6 config ��

Jan 18, 20152 likes746 views

This document provides tuning recommendations for various MySQL configuration variables. It recommends: - Tuning variables one at a time and being aware of interdependencies - Setting innodb_buffer_pool_size to 2x RAM for write-intensive workloads - Setting max_connections to over 1000 is not recommended and to use a thread pool instead - Avoid using innodb_file_per_table for workloads with over 10k tables - Setting innodb_flush_log_at_trx_commit to 1 for safety and 2 for replication.

�{��ԭ�t
1.һ��{��һ��
2.Set Global:��ԓ׃��dynamic��t��
runtime��variables��restart��ʧ��O
��option file
3.ע��variable��P��
4.ram 2�治��ж��2��

innodb_buffer_pool_size
1.cache both data and index
2.512M:for normal
3.4G:for ��
4.5.6 above
5.redo log

max_connections
1.>1000 is not OK(��O2000)
2.thread pool
3.connection pool

innodb_file_per_table
1.bad performance
2.>10k table is not good
3.reclaim space as dropping, truncating or
rebuilding

innodb_flush_log_at_trx_commit
=1
1.safety
2.flush�r��ж��fsyncs
3.��ȫACID

innodb_flush_log_at_trx_commit
=2
1.ÿ�� flush committed transactions �� redo log
2.�m��replica
3.loss data as OS crash
=0
1.crash�r��Gʧ

innodb_flush_method
1.ͨ��O_DIRECT
2.sysbench��Д�

innodb_log_buffer_size
-flushed every 1 sec
-default is ok for medium write & shorter
transactions
-more for activity spikes or lots of blobs work

innodb_log_buffer_size
-not committed yet
-1MB
-innodb_log_waits
-larger will save disk I/O

innodb_log_file_size
larger:
-better performance
-longer recovery time
-less checkpoint flush activity

innodb_log_file_size
BUG #69477
5.6.20 5.6.22
10 times larger than
the largest BLOB +
length of other
variable length
fields
redo log BLOB��s
max is 10% of redo
log size

Query_cache_size
1.well-known bottleneck
2.better to be zero
3.good indexing, replicas, external cache
4.not good for real practice
5.Today��s machine is much faster than before

log_bin
1.for replication master
2.also got to set server_id
3.to save disk space:
a.expire_logs_days
b.purge binary logs

skip_name_resolve
1.enable it to prevent the slow DNS let you
slow
2.GRANT got to use IP address
3.skip_name_resolve

PS
1.table_cache
2.thread_cache:dont create thread for normal
operation

PS
http://dev.mysql.com/doc/refman/5.
6/en/server-system-variables.
html#sysvar_table_definition_cache

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MySQL 5.6 config ��

1. MySQL config Tuning Alexis

2. �{��ԭ�t 1.һ��{��һ�� 2.Set Global:��ԓ׃��dynamic��t�� runtime��variables��restart��ʧ��O ��option file 3.ע��variable��P�� 4.ram 2�治��ж��2��

3. innodb_buffer_pool_size 1.cache both data and index 2.512M:for normal 3.4G:for �� 4.5.6 above 5.redo log

4. max_connections 1.>1000 is not OK(��O2000) 2.thread pool 3.connection pool

5. innodb_file_per_table 1.bad performance 2.>10k table is not good 3.reclaim space as dropping, truncating or rebuilding

6. innodb_flush_log_at_trx_commit =1 1.safety 2.flush�r��ж��fsyncs 3.��ȫACID

7. innodb_flush_log_at_trx_commit =2 1.ÿ�� flush committed transactions �� redo log 2.�m��replica 3.loss data as OS crash =0 1.crash�r��Gʧ

8. innodb_flush_method 1.ͨ��O_DIRECT 2.sysbench��Д�

9. innodb_log_buffer_size -flushed every 1 sec -default is ok for medium write & shorter transactions -more for activity spikes or lots of blobs work

10. innodb_log_buffer_size -not committed yet -1MB -innodb_log_waits -larger will save disk I/O

11. innodb_log_file_size larger: -better performance -longer recovery time -less checkpoint flush activity

12. innodb_log_file_size BUG #69477 5.6.20 5.6.22 10 times larger than the largest BLOB + length of other variable length fields redo log BLOB��s max is 10% of redo log size

13. Query_cache_size 1.well-known bottleneck 2.better to be zero 3.good indexing, replicas, external cache 4.not good for real practice 5.Today��s machine is much faster than before

14. log_bin 1.for replication master 2.also got to set server_id 3.to save disk space: a.expire_logs_days b.purge binary logs

15. skip_name_resolve 1.enable it to prevent the slow DNS let you slow 2.GRANT got to use IP address 3.skip_name_resolve

16. PS 1.table_cache 2.thread_cache:dont create thread for normal operation

17. PS http://dev.mysql.com/doc/refman/5. 6/en/server-system-variables. html#sysvar_table_definition_cache

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