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https://stackoverflow.com/questions/6067093/in-mysql-why-is-it-safe-to-turn-off-innodb-support-xa-for-single-threaded-updat
Nov 22, 2011 · obtain mutex write innodb log and fsync, for prepare-phase (skip if innodb_support_xa=0) write binlog (fsync as appropriate if sync_binlog > 0) write innodb log and fsync, for commit-phase release mutex On and after InnoDB Plugin 1.0.4 (and MySQL 5.5), it is now:
https://www.percona.com/blog/2011/03/02/what-is-innodb_support_xa/
Mar 03, 2011 · A common misunderstanding about innodb_support_xa is that it enables user-initiated XA transactions, that is, transactions that are prepared and then committed on multiple systems, with an external transaction coordinator. This is actually not precisely what this option is for. It enables two-phase commit in InnoDB (prepare, then commit). This is necessary not only for user-initiated …
https://dev.mysql.com/doc/refman/5.7/en/innodb-parameters.html
innodb_large_prefix is deprecated and will be removed in a future release. innodb_large_prefix was introduced to disable large index key prefixes for compatibility with earlier versions of InnoDB that do not support large index key prefixes. innodb_limit_optimistic_insert_debug
https://dev.mysql.com/doc/refman/8.0/en/innodb-parameters.html
Controls loading of the InnoDB storage engine, if the server was compiled with InnoDB support. This option has a tristate format, with possible values of OFF, ON, or FORCE.See Section 5.6.1, “Installing and Uninstalling Plugins”. To disable InnoDB, use --innodb=OFF or --skip-innodb.
https://bugs.mysql.com/bug.php?id=35786
Advice Turn off XA distributed transaction support if you do not need it: Add innodb_support_xa=0 to your my.cnf/my.ini file and restart the server. Recommended Action SET GLOBAL innodb_support_xa = 0; <<--- So customers not sure when they should consider that alert valuable.
https://forums.mysql.com/read.php?22,443753,467613
Oct 15, 2011 · innodb_support_xa=0 Using either of those two InnoDB options means that you can get events written to the binary log in a different order from the order in which they are committed in the database. That different order can cause a slave or restore of backup and binary log reply to have different data in the table than was there originally.
https://www.percona.com/blog/2006/05/19/group-commit-and-xa/
Returning to post Group commit and real fsync I made several experiments: I ran sysbench update_key benchmarks without —log-bin, with —log-bin, and with —log-bin and —innodb-support-xa=0 (default value is 1). Results (in transactions / sec) threads without —log-bin —log-bin —log-bin and —innodb_support-xa=0 1 1218.68 614.94 1010.44 4 2686.36 667.77 1162.60 16 3993.59 666.14 ...
https://bugs.mysql.com/bug.php?id=81899
We experienced the same problem across various clients and found out that the problem was due to setting the value of innodb_lru_scan_depth from the default of 1024 to as low as 128.
https://stackoverflow.com/questions/35638126/mysql-unknown-variable-in-my-cnf
I follow these instructions to speed up loading a big local file (500+M, 10+M rows) into MySQL, adding configurations to /etc/mysql/my.cnf: [mysql] #no-auto-rehash # faster start of mysql but no tab completition local-infile=1 # add following code innodb_doublewrite = 0 innodb_support_xa = 0
https://planet.mysql.com/?tag_search=1303
Mar 28, 2018 · innodb_flush_log_at_trx_commmit = 0 innodb_support_xa = 0 skip-innodb-doublewrite disable log-bin & log_slow_queries Since the goal is to reload data quickly, we need to eliminate any potential bottlenecks. Setting innodb_flush_log_at_trx_commit = 0 this will reduce the amount of disk I/O by avoiding a flush to disk on each commit.
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