daily_issues
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daily_issues [2016/05/13 14:45] k2patel [Reading Binlog] |
daily_issues [2020/08/10 02:35] |
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| - | ==== Mysql Upgrade Issue ==== | ||
| - | |||
| - | ==== Easy Command List ==== | ||
| - | |||
| - | == How to check Type of Table == | ||
| - | You can use any of the following command to determine table type. | ||
| - | |||
| - | <code sql> | ||
| - | SHOW TABLE STATUS WHERE Name = 'table_name'; | ||
| - | OR | ||
| - | SHOW CREATE TABLE 'table_name'; | ||
| - | OR | ||
| - | SHOW TABLE STATUS; | ||
| - | </code> | ||
| - | |||
| - | |||
| - | |||
| - | ==== MySQL Cluster information gathering ==== | ||
| - | |||
| - | === How to find which master log slave reading === | ||
| - | <code sql> | ||
| - | cat slaves | while read i ; do echo $i; mysql -h$i -e "SHOW SLAVE STATUS \G" | grep "Relay_Master_Log_File"; done | ||
| - | </code> | ||
| - | |||
| - | === How continue with the next statement in the replication === | ||
| - | |||
| - | NOTE : Make sure you run the query manually on slave if it is query issue. | ||
| - | |||
| - | <code sql> | ||
| - | STOP SLAVE; SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1; START SLAVE; | ||
| - | </code> | ||
| - | |||
| - | ==== Issue / Solutions ==== | ||
| - | |||
| - | |||
| - | == Â appeared after upgrade == | ||
| - | |||
| - | This issue is appeared due to the default character set.\\ | ||
| - | As Both version of database diff. character set. | ||
| - | To get rid of that character try to following steps. | ||
| - | |||
| - | <code text> | ||
| - | 1. insert following line to your my.cnf | ||
| - | set-variable=character-set-server=UTF8 | ||
| - | 2. re-import database should fix the issue. | ||
| - | </code> | ||
| - | |||
| - | == mysqldump does not save stored procedure / functions / triggers. == | ||
| - | |||
| - | By default mysqldump only store triggers not procedures/functions. | ||
| - | |||
| - | In order to include to your mysqldump there is switch \\ | ||
| - | -R, --routines Dump stored routines (functions and procedures). | ||
| - | |||
| - | In order to include triggers to your mysqldump there is switch \\ | ||
| - | --triggers Dump triggers for each dumped table | ||
| - | |||
| - | <code mysql> | ||
| - | mysqldump -R -u <username> -p<password> <database> | ||
| - | </code> | ||
| - | |||
| - | |||
| - | == After upgrade from 4.0 to 4.1 see issue on charset == | ||
| - | |||
| - | Use following line in your my.cnf will resolve the issue. | ||
| - | as latin1 is default character set in 4.0 and 4.1 has utf8 | ||
| - | |||
| - | <code text | my.cnf> | ||
| - | set-variable=character-set-server=latin1 | ||
| - | </code> | ||
| - | |||
| - | |||
| - | ==== General Log ==== | ||
| - | |||
| - | It log each and every query.\\ | ||
| - | You can enable it in TABLE or FILE.\\ | ||
| - | |||
| - | Following method shows how to enable it in table without restarting,\\ | ||
| - | Also same you can apply in my.cnf\\ | ||
| - | |||
| - | Structure usually created with mysql installation if you don't see could be old structure.\\ | ||
| - | try running //mysql_upgrade// | ||
| - | |||
| - | <code sql | Table Structure> | ||
| - | CREATE TABLE `general_log` ( | ||
| - | `event_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, | ||
| - | `user_host` mediumtext, | ||
| - | `thread_id` int(11) DEFAULT NULL, | ||
| - | `server_id` int(11) DEFAULT NULL, | ||
| - | `command_type` varchar(64) DEFAULT NULL, | ||
| - | `argument` mediumtext) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='General log' | ||
| - | </code> | ||
| - | |||
| - | You can choose //log_output// to be file OR table OR both. | ||
| - | |||
| - | <code sql | Variable> | ||
| - | general_log=1 | ||
| - | log_output=TABLE,FILE | ||
| - | </code> | ||
| - | |||
| - | Following command can help you apply changes without restart. | ||
| - | |||
| - | <code sql | Command > | ||
| - | SET GLOBAL log_output='TABLE'; | ||
| - | SET GLOBAL general_log='ON'; | ||
| - | </code> | ||
| - | |||
| - | How to flush log. | ||
| - | |||
| - | <code sql | Flush log> | ||
| - | mysql -u root -pp4ssw0rd -e "TRUNCATE TABLE mysql.general_log" | ||
| - | </code> | ||
| - | |||
| - | ==== mysql dump only partition information ==== | ||
| - | If you were planning to drop a partition, you may need to back it up. find out the range of the partition by | ||
| - | |||
| - | <code> | ||
| - | show create table tablename | ||
| - | </code> | ||
| - | |||
| - | replace the range fields as follows: | ||
| - | <code> | ||
| - | mysqldump -S --no-create-info --where="RANGE(day) >= lowrange AND RANGE(day) < highrange" database_name table_name > /jtmp/table.sql | ||
| - | </code> | ||
| - | |||
| - | ==== Reading Binlog ==== | ||
| - | |||
| - | Simple command to read binlog is | ||
| - | <code bash> | ||
| - | mysqlbinlog mysql-bin.000013 | ||
| - | </code> | ||
| - | |||
| - | You can use following regularly used options. | ||
| - | <code bash> | ||
| - | --start-datetime= | ||
| - | --start-position= | ||
| - | --server-id= | ||
| - | </code> | ||
| - | |||
| - | ==== Can't open file ==== | ||
| - | |||
| - | I've started seeing following error in my log.\\ | ||
daily_issues.txt · Last modified: 2020/08/10 02:35 (external edit)
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