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登入 | 注册Planet MySQLClose 主页Meta常见问题LanguageEnglishDeutschEspañolFrançaisItaliano日本語РусскийPortuguês中文Submit Your FeedAggregate feed表示 进入内容 1 去 10 的 36839下一步 10 较早的记录 »Oct292016MyRocks has some strange performance issues for index scansPosted by Justin Swanharton Sat 29 Oct 2016 11:46 UTCTags:bug, MySQL, Performance, MyRocks, rockdbThe details on this issue are here:https://github.com/facebook/mysql-5.6/issues/369This test is very simple. I loaded the SSB (star schemabenchmark) data for scale factor 20 (12GB raw data), addedindexes, and tried to count the rows in the table.After loading data and creating indexes, the .rocksdb datadirectory is 17GB in size.A full table scan "count(*)" query takes less than four minutes,sometimes reading over 1M rows per second, but when scanning theindex to accomplish the same count, the database can only scanaround 2000 rows per second. The four minute query would take anestimated 1000 minutes, a 250x difference.I have eliminated the type of CRC32 function (SSE vs non-SSE) byforcing the hardware SSE function by patching the code.There seem to be problems with any queries …[获取更多]Oct292016MySQL Support Engineer's Chronicles, Issue #2Posted by Valeriy Kravchukon Sat 29 Oct 2016 07:10 UTCTags:Replication, innodb, partitioning, FOSDEM, gdb, Locks, optimizer, performance_schema, perf, galera, PMP, MySQL, speculations, names, MyRocksIt's time to continue my new series that I've started 2 weeks ago. I'd like to start with a reminderthat it's time to send your talks for "MySQL and Friends Devroom" at FOSDEM 2017 -the only MySQL-related event next year that I plan to attend inany case. It seems we have one more week to submit, but I'vealready filled in all the details for the "main" talk,"Understanding MyRocks locks and deadlocks". I'd like toapply my usual source code reading and gdb breakpoints approach in case if bythe end of January, 2017 official documentation still missesimportant details. Official MySQL …[获取更多]Oct292016FromDual.en: FromDual Backup and Recovery Manager for MySQL 1.2.3 has been releasedPosted by FromDualon Sat 29 Oct 2016 12:50 UTCFromDual has the pleasure to announce the release of the newversion 1.2.3 of the popular Backup and Recovery Manager for MySQL and MariaDB(fromdual_brman).You can download the FromDual Backup and Recovery Manager f
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