Post: Common MySQL traps webinar questions followup
…spot and this query is a good candidate for optimization. I have even seen a case where one … you will need to alter the table, which may be difficult if the table is big. So the best … Q: Are these...
View ArticlePost: The Optimization That (Often) Isn't: Index Merge Intersection
… execution plan: *************************** 1. row *************************** id: 1 select_type: SIMPLE table: users type: index_merge possible_keys: PRIMARY,parent_id,…a few possibilities: A new...
View ArticlePost: Is there room for more MySQL IO Optimization?
… cached — system files, binary log, FRM files, MySQL MyISAM system tables etc. Starting MySQL 5.5 MySQL uses asynchronous IO which should allow it… have and old table which was not optimized for...
View ArticleComment: MySQL 5.5 and 5.6 default variable values differences
…_THREAD_INSTANCES | 1000 | 224 | | SOCKET | /tmp/mysql_sandbox5530.sock | /tmp/mysql_sandbox5610.sock | | INNODB_FILE_PER_TABLE | OFF | ON | | SYNC_MASTER_INFO | 0… sense in my opinion. MySQL 5.6 adds...
View ArticlePost: Percona MySQL Webinar: Really Large Queries: Advanced Optimization...
…=”attachment_12964″ align=”alignright” width=”285″] Really Large Queries: Advanced Optimization Techniques: Wednesday, February 27, 2013 10 a.m. PST[/caption… as a 7 table join. In this webinar, we...
View ArticlePost: Is MySQL 5.6 slower than MySQL 5.5?
… advantage of any of new MySQL 5.6 optimizations so it is geared towards worse case scenario for MySQL 5.6 performance. Here…_6_10# sysbench –test=oltp –mysql-socket=/tmp/mysql_sandbox5610.sock...
View ArticlePost: Implications of Metadata Locking Changes in MySQL 5.5
...| | checking permissions | 0.000006 | | Opening tables | 213.028481 | | System lock | 0.000009 | | init | 0.000014 | | optimizing | 0.000002 | | statistics | 0.000005 | | ...table that is already in...
View ArticlePost: MySQL optimizer: ANALYZE TABLE and Waiting for table flush
… MySQL optimizer makes the decision of what execution plan to use based… execution plan for another query we run ANALYZE TABLE: mysql> analyze table t; +——–+———+———-+———-+ | Table | Op | Msg_type |...
View ArticlePost: InnoDB Full-text Search in MySQL 5.6 (part 1)
…_count | | | optimize_start_time | | | optimize_end_time | | | stopword_table_name | | | use_stopword | 1 | | table_state | 0 | +—————————+———+ 10 rows in set (0.02 sec) mysql> optimize table...
View ArticlePost: Announcing Percona Server for MySQL 5.5.30-30.1
…” align=”alignright” width=”247″] Percona Server for MySQL version 5.5.30-30.1[/caption] … log disabled. Bug fixed #1123915 (Alexey Kopytov). Optimization cleanup to avoid calls related to extended...
View ArticlePost: MySQL 5.6 vs MySQL 5.5 and the Star Schema Benchmark
... in pages afterwards: mysql> select sq.*, pages / (@@innodb_buffer_pool_size / 16384) * 100 pct_buffer_pool from ( select table_name, index_name... promised, here are the results from joining the...
View ArticlePost: MySQL 5.6.10 Optimizer Limitations: Index Condition Pushdown
…one of the nicest features of the newer MySQL optimizer: the Index Condition Pushdown Optimization, or ICP, which we have previously discussed … ‘%Jaime%’\G *************************** 1. row...
View ArticlePost: Implications of Metadata Locking Changes in MySQL 5.5
...| | checking permissions | 0.000006 | | Opening tables | 213.028481 | | System lock | 0.000009 | | init | 0.000014 | | optimizing | 0.000002 | | statistics | 0.000005 | | ...table that is already in...
View ArticlePost: Is there room for more MySQL IO Optimization?
… cached — system files, binary log, FRM files, MySQL MyISAM system tables etc. Starting MySQL 5.5 MySQL uses asynchronous IO which should allow it… have and old table which was not optimized for...
View ArticlePost: 5 Percona Toolkit Tools for MySQL That Could Save Your Day: April 6...
… improve to get optimal response times pt-archiver, to efficiently purge purge data from huge tables pt-table-checksum/pt-table-sync, to check… solve typical, real-world MySQL database administration...
View ArticlePost: MySQL 5.6 Compatible Percona Toolkit 2.2 Released
… how. There’s still one noticeable omission: pt-table-sync. It’s still unclear if or how…feature is still in development while we determine the optimal JSON structure. Version check is on by default…...
View ArticlePost: Implications of Metadata Locking Changes in MySQL 5.5
...| | checking permissions | 0.000006 | | Opening tables | 213.028481 | | System lock | 0.000009 | | init | 0.000014 | | optimizing | 0.000002 | | statistics | 0.000005 | | ...table that is already in...
View ArticlePost: Is MySQL 5.6 slower than MySQL 5.5?
… advantage of any of new MySQL 5.6 optimizations so it is geared towards worse case scenario for MySQL 5.6 performance. Here…_6_10# sysbench –test=oltp –mysql-socket=/tmp/mysql_sandbox5610.sock...
View ArticlePost: Percona Server for MySQL 5.5.30-30.2 now available
… secondary keys from deferred key creation optimization. Bug fixed #1081016 (Alexey Kopytov). Percona Server for MySQL was built with YaSSL which could… (Alexey Bychko). Percona Server for MySQL was...
View ArticlePost: Percona MySQL Webinar: Really Large Queries: Advanced Optimization...
…=”attachment_12964″ align=”alignright” width=”285″] Really Large Queries: Advanced Optimization Techniques: Wednesday, February 27, 2013 10 a.m. PST[/caption… as a 7 table join. In this webinar, we...
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