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10 Newer Entries Showing entries 121 to 130 of 842 10 Older Entries

Displaying posts with tag: innodb (reset)

Fun with Bugs #31 - what's new in MySQL 5.6.17
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MySQL 5.6.17 will probably be announced loudly at or immediately before Percona Live MySQL Conference & Expo next week. But official release announcement via email was made on March 28, release notes and binaries to download are already available, so why not to check them carefully to find out what to expect from this 8th minor release of MySQL 5.6 GA...

First of all, it seems Oracle still does not hesitate to introduce new features and …

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Innodb redo log archiving
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Percona Server 5.6.11-60.3 introduces a new “log archiving” feature. Percona XtraBackup 2.1.5 supports “apply archived logs.” What does it mean and how it can be used?

Percona products propose three kinds of incremental backups. The first is full scan of data files and comparison the data with backup data to find some delta. This approach provides a history of changes and saves disk space by storing only data deltas. But the disadvantage …

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MySQL 5.6.17: Improved Online Optimize Table For INNODB and PARTITIONED INNODB Tables
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OPTIMIZE TABLE is a maintenance operation used to recover the disk space and improve IO efficiency. It is recommended that the operation is carried out under the cases noted in the optimize table documentation.

MySQL versions prior to MySQL 5.6.17 does not allow concurrent changes (inserts, updates, deletes) to the table when the OPTIMIZE TABLE operation is being performed on that table. This causes downtime for user applications and is relatively high for large tables.

OPTIMIZE TABLE for INNODB or PARTITIONED …

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InnoDB Primary Key versus Secondary Index: An Interesting Lesson from EXPLAIN
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I ran into an interesting issue today, while examining some EXPLAIN outputs, and wanted to share the findings, as some of this is undocumented.

Basically, you can start with a very simple InnoDB table - 2 INT columns, Primary Key (PK) on the 1st column, regular index on the 2nd:

CREATE TABLE `t1` (
  `id1` int(10) unsigned NOT NULL,
  `id2` int(10) unsigned DEFAULT NULL,
  PRIMARY KEY (`id1`),
  KEY `id2` (`id2`)
) ENGINE=InnoDB;

The query is:

SELECT id1 FROM t1;

This is a straight-forward query with no WHERE clause.

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InnoDB Primary Key versus Secondary Index: An Interesting Lesson from EXPLAIN
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I ran into an interesting issue today, while examining some EXPLAIN outputs, and wanted to share the findings, as some of this is undocumented.

Basically, you can start with a very simple InnoDB table – 2 INT columns, Primary Key (PK) on the 1st column, regular index on the 2nd:

CREATE TABLE `t1` (
  `id1` int(10) unsigned NOT NULL,
  `id2` int(10) unsigned DEFAULT NULL,
  PRIMARY KEY (`id1`),
  KEY `id2` (`id2`)
) ENGINE=InnoDB;

The query is:

SELECT id1 FROM t1;

This is a straight-forward query with no WHERE clause.

Given no WHERE clause, we know there will be a full table or index scan. Let’s look at EXPLAIN:

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Presenting MySQL 5.7 Performance & Benchmarks at Percona Live
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I’ll speak about MySQL 5.7 Performance & Benchmarks during the incoming Percona Live and will be happy to share with you all our latest finding, improvements, benchmark results, open issues and many other stuff keeping our brains in constant activity ) As you know, there is no a “silver bullet” solution for MySQL Performance tuning.. – only by a good understanding of what is going inside of MySQL and InnoDB you may configure your MySQL server in the most optimal way for your workloads. And this topic …

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innodb_flush_logs_on_trx_commit and Galera Cluster
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We deploy Galera Cluster (in MariaDB) for some clients, and innodb_flush_logs_on_trx_commit is one of the settings we’ve been playing with. The options according to the manual:

  • =0 don’t write or flush at commit, write and flush once per second
  • =1 write and flush at trx commit
  • =2 write log, but only flush once per second

The flush (fsync) refers to the mechanism the filesystem uses to try and guarantee that written data is actually on the physical medium/device and not just in a buffer (of course cached RAID controllers, SANs and other devices use some different logic …

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Presenting MySQL/InnoDB at Percona Live 2014
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I will be presenting at Percona Live 2014 and I’m excited to share and discuss the latest and greatest features and improvements that we have made to MySQL/InnoDB in 5.7. Great performance improvements, there are some new exciting compression features that we are working on,  GIS support,  temporary table performance etc.. There is a long list. Also, we are always interested to hear about user issues and priorities so that we can address them and/or work them into our plan. Your feedback is very important for us, if you want to influence the direction of InnoDB development then you need to talk to me .

MariaDB 10.0.9 now available
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The MariaDB project is pleased to announce the immediate availability of MariaDB 10.0.9. This is a Release Candidate release.

Among other changes, XtraDB is now the default InnoDB implementation, Oracle’s InnoDB is included as a plugin and can be dynamically loaded if desired. Packages for Ubuntu 14.04 “trusty” and Debian “Sid” have also been added to the MariaDB Ubuntu and Debian repositories.

See the …

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Engineer duo from Google, LinkedIn join again for InnoDB talks
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Google senior systems engineer Jeremy Cole is once again teaming with LinkedIn senior software engineer Davi Arnaut for two InnoDB-focused sessions at the upcoming Percona Live MySQL Conference and Expo 2014 this April 1-4 in Santa Clara, California.

The duo will present “InnoDB: A journey to the core II” on April 2 and “ …

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10 Newer Entries Showing entries 121 to 130 of 842 10 Older Entries

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