69 lines
2.2 KiB
Markdown
69 lines
2.2 KiB
Markdown
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title = "mysql"
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draft = false
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tags = [
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"code",
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"db",
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"mysql"
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]
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date = "2014-09-11"
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+++
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# MySQL
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### DB Syncing
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Mogelijk met verschillende tools, over verschillende DB types heen. Bvb om schema's te syncen tussen MSSQL DBs en MySQL DBs, etc etc. Enkele voorbeeldtools:
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* MSSQL: AdeptSQL Diff [http:*www.adeptsql.com/](http:*www.adeptsql.com/)
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* MYSQL: SQLyog [https:*www.webyog.com/](https:*www.webyog.com/)
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Maakt een SQL DDL aan met het verschil tussen database schema's naar keuze.
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<img style='float: left; width: nolink |px;' src='/img//code/db/powertools.png'>
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### ADO.NET connection
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##### Pooling
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Enabled by default, zie [Connector .NET Connection options](http://dev.mysql.com/doc/connector-net/en/connector-net-connection-options.html); voorbeeld:
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`Server######server; Port3306; Database######db; Uidroot; Pwd######root; Poolingtrue;`
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Dingen als maximum pool size, initial size etc ook instelbaar (zie link)
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### Monitoring
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##### configuratie properties via SQL uitlezen
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Bijvoorbeeld **max connections**: `show variables like "max_connections";`
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Allemaal aanpasbaar via `set global max_connections = 200;` (root rechten required)
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##### Aantal momenteel actieve threads bezien
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`SHOW GLOBAL STATUS where variable_name like '%Threads%';` geeft:
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```
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Variable_name value
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----------------------------
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Delayed_insert_threads 0
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Slow_launch_threads 0
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Threads_cached 8
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Threads_connected 56
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Threads_created 138
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Threads_running 2
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```
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##### Huidige connecties killen
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Zie [Mass killing of MySQL connections](http://www.mysqlperformanceblog.com/2009/05/21/mass-killing-of-mysql-connections/)
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Gaat **niet rechtstreeks**; eerst een file maken met `kill` commands en die dan sourcen in een mysql command line:
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`select concat('KILL ', id, ';') from information_schema.processlist where host like '%myhost%' into outfile 'c:<br/>a.txt';`
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:exclamation: Forward slashen in Windows gebruiken, of dubbele backslash.
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Stap 2: `source c:/a.txt` - géén single quotes hierrond (anders error code 22) en geen single baskslash (anders error code 2, = file not found)
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MySQL command line opstarten: ga naar bin dir van installed server, en execute `mysql --user###### --pass`.
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