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set_var.cc, mysqld.cc, ha_innodb.cc, sql_class.h:

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Add a settable session variable innodb_support_xa; setting it to 0 can save up to 10 % of CPU time and 150 bytes of space in each undo log
trx0trx.h, trx0undo.c, trx0trx.c, trx0roll.c:
  Enable XA if innodb_support_xa is not set to 0; make prepare to do log fsync's according to innodb_flush_log_at_trx_commit
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heikki@hundin.mysql.fi
2005-03-13 12:49:39 +02:00
parent 536728c5e8
commit a95f09e228
8 changed files with 127 additions and 53 deletions
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6
sql/mysqld.cc
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@@ -4211,6 +4211,7 @@ enum options_mysqld
OPT_INNODB_STATUS_FILE,
OPT_INNODB_MAX_DIRTY_PAGES_PCT,
OPT_INNODB_TABLE_LOCKS,
OPT_INNODB_SUPPORT_XA,
OPT_INNODB_OPEN_FILES,
OPT_INNODB_AUTOEXTEND_INCREMENT,
OPT_INNODB_SYNC_SPIN_LOOPS,
@@ -4514,6 +4515,11 @@ Disable with --skip-innodb-doublewrite.", (gptr*) &innobase_use_doublewrite,
(gptr*) &global_system_variables.innodb_table_locks,
(gptr*) &global_system_variables.innodb_table_locks,
0, GET_BOOL, OPT_ARG, 1, 0, 0, 0, 0, 0},
{"innodb_support_xa", OPT_INNODB_SUPPORT_XA,
"Enable InnoDB support for the XA two-phase commit",
(gptr*) &global_system_variables.innodb_support_xa,
(gptr*) &global_system_variables.innodb_support_xa,
0, GET_BOOL, OPT_ARG, 1, 0, 0, 0, 0, 0},
#endif /* End HAVE_INNOBASE_DB */
{"isam", OPT_ISAM, "Enable ISAM (if this version of MySQL supports it). \
Disable with --skip-isam.",