…innodb_read_io_threads = 16 innodb_write_io_threads = 16 innodb_io_capacity = 20000 innodb_io_capacity_max = 40000 #not innodb…table_size = 64M sort_buffer_size = 4M join_buffer_size = 4M thread_cache_size … myisam_sort_buffer_size = 8M myisam_max_sort_file_size = 10G myisam_repair_threads = 1 myisam…
Comment: Using CHAR keys for joins, how much is the overhead ?
June 19, 2007 By 18 Comments
… BIGINT slowed down join speed for MyISAM tables from 1.7 seconds to 3.8 seconds, which is slower than Innodb with chars…. First one is LATIN1 which improved join speed from 6.1 to 4.4 seconds for Innodb tables. Using VARBINARY instead gave…) in my “short” varchar join tests for Innodb table with utf8 encoding. This caused some degradation slowing down join speed from 4.5…
Post: MySQL 5.5 and MySQL 5.6 default variable values differences
February 21, 2013 By 8 Comments
…-5.6.10-linux-glibc2. | | MAX_ALLOWED_PACKET | 1048576 | 4194304 | | JOIN_BUFFER_SIZE | 131072 | 262144 | | TMPDIR | /mnt/data/sandboxes/msb_5….30 | 5.6.10 | | INNODB_CONCURRENCY_TICKETS | 500 | 5000 | | INNODB_PURGE_THREADS | 0 | 1 | | INNODB_OPEN_FILES | 300 | 2000 | | INNODB_DATA_FILE_PATH | ibdata1… which is good change as trying to create Innodb table but getting MyISAM because Innodb was disabled for some reason was very error…
Post: Why MySQL could be slow with large tables ?
June 9, 2006 By 141 Comments
… access, jam packed rows – quite possible scenario for MyISAM tables. Now if we take the same hard … are scanned. There are also clustered keys in Innodb which combine index access with data access, saving … gap but I doubt it will be closed. Joins Joins are used to compose the complex object which …
Post: MySQL Indexing Best Practices: Webinar Questions Followup
August 16, 2012 By 4 Comments
… Innodb Table id2 is not needed pas part of second key as PRIMARY key is appended to it internally anyway. For MyISAM… such unusual setup. Q: Table1 has a primary key. Table2 joins to table1 using Table1′s primary key. Should table2 have… index for “order by desc” indicates a double linked list. Innodb has double linked list – each leaf page contains pointers to…
Comment: Should you move from MyISAM to Innodb ?
January 28, 2009 By 59 Comments
… one which ran 3 mins before optimization), as each query joins several tables, often 5-6-7 ones. And when the… without InnoDB. So I think I should stick to MyISAM. I can guess that now, when you started developing XtraDB based on InnoDB, you will be almost entirely focused on InnoDB…
Comment: MySQL Server Memory Usage
September 1, 2006 By 21 Comments
… ’1462755007′ ‘Rpl_status’, ‘NULL’ ‘Select_full_join‘, ’0′ ‘Select_full_range_join‘, ’0′ ‘Select_range’, ’5683551′ ‘…key_buffer_size=32M # Only for MyISAM which isnt used. sort_buffer_size…innodb_additional_mem_pool_size=20M innodb_file_io_threads=4 innodb_lock_wait_timeout=15 # CHANGED from 50 innodb…
Post: Percona XtraDB Cluster - installation and setup webinar follow up Q&A
October 28, 2012 By 4 Comments
…have any specific recommandations for Zabbix, but general InnoDB tuning recommendations apply here, in large zabbix deployments…_cluster_name as an argument. It will join the cluster, but won’t store or serve… works as a sst method for myisam? A: Yes, but for MyISAM xtrabackup is blocking, since it …
Comment: Why MySQL could be slow with large tables ?
June 20, 2007 By 141 Comments
…timeout=5 thread_cache_size=60 key_buffer=750M join_buffer=10M max_heap_table_size=50M tmp_…size=9M max_connect_errors=10 thread_concurrency=4 myisam_sort_buffer_size=950M character-set-server=utf8 …available, for instance) and eking performance out of an InnoDB table for raw SELECT speed will take a …
Comment: How much memory can MySQL use in the worst case?
February 19, 2009 By 17 Comments
… sale and/or rent. We are currently using MySQL and MyISAM tables and we keep running out of memory so the… out as not good to be, here are a few: Innodb_buffer_pool_reads 12 Handler_read_rnd 2,448 k… the server some….maybe use InnoDB since the database is 3NF and uses alot of selects using joins? Any tips and help…
