步骤一:编辑配置文件 打开MySQL的配置文件my.cnf,并添加如下配置项: [mysqld] slow_query_log = 1 # 开启慢查询日志 slow_query_log_file = /var/log/mysql/slow.log # 慢查询日志文件路径 long_query_time = 2 # 定义慢查询时间阈值,单位为秒 这段代码中,我们通过设置slow_query_log为1来开启慢查询日...
mysql.slave_relay_log_info OK mysql.slave_worker_info OK mysql.slow_log OK mysql.tables_priv OK mysql.time_zone OK mysql.time_zone_leap_second OK mysql.time_zone_name OK mysql.time_zone_transition OK mysql.time_zone_transition_type OK mysql.userOK 实际上该工具是为了方便用户使用,而使用了...
Slow_queries:慢查询的次数。2 定位执行效率较低的 SQL 语句可以通过以下两种方式定位执行效率较低的 SQL 语句。通过慢查询日志定位那些执行效率较低的 SQL 语句,用--log-slow-queries[=file_name]选项启动时,mysqld 写一个包含所有执行时间超过 long_query_time 秒的 SQL 语句的日志文件。具体可以查看本书第 ...
mysql.servers OK mysql.slave_master_info OK mysql.slave_relay_log_info OK mysql.slave_worker_info OK mysql.slow_log OK mysql.tables_priv OK mysql.time_zone OK mysql.time_zone_leap_second OK mysql.time_zone_name OK mysql.time_zone_transition OK mysql.time_zone_transition_type OK mysql.us...
tOKmysql.serversOKmysql.slave_master_infoOKmysql.slave_relay_log_infoOKmysql.slave_worker_infoOKmysql.slow_logOKmysql.tables_privOKmysql.time_zoneOKmysql.time_zone_leap_secondOKmysql.time_zone_nameOKmysql.time_zone_transitionOKmysql.time_zone_transition_typeOKmysql.userOKsys.sys_configOKtest.db_...
サーバーへの接続に使用する MySQL アカウントのユーザー名。 --verbose,-v 冗長モード。 プログラム処理のさまざまな段階についての情報を出力します。 --version,-V バージョン情報を表示して終了します。 --write-binlog このオプションはデフォルトで有効で、mysqlcheckによって生成され...
Write a debugging log. A typicaldebug_optionsstring isd:t:o,file_name. The default isd:t:o. This option is available only if MySQL was built usingWITH_DEBUG. MySQL release binaries provided by Oracle arenotbuilt using this option.
mysql.innodb_index_stats OK mysql.innodb_table_stats OK mysql.ndb_binlog_index OK mysql.plugin OK mysql.proc OK mysql.procs_priv OK mysql.proxies_priv OK mysql.servers OK mysql.slave_master_info OK mysql.slave_relay_log_info OK mysql.slave_worker_info OK mysql.slow_log OK mysql.tables...
MySQL log will show the following errors: ERROR, InnoDB: Cannot create file './EDMconfluence/supporthealthchecks.ibd' ERROR, InnoDB: The file './EDMconfluence/supporthealthchecks.ibd' already exists though the corresponding table did not exist in the InnoDB data dictionary. Have...
It turns out the issue is that mysqld spends all of its time in _checkchunk() (safemalloc is enabled due to a debug build) and thus all tables remain perpetually locked. Only a single CPU core is used, the rest are idle. While the manual does say that safemalloc is very slow, I...