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Illegal division by zero #423

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Jean-Marie Renouard 2019-03-06 14:25:59 +00:00
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README.md
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@ -61,6 +61,9 @@ that you trust. **Always** test your changes on staging environments, and
always keep in mind that improvements in one area can **negatively affect** always keep in mind that improvements in one area can **negatively affect**
MySQL in other areas. MySQL in other areas.
It's **also important** to wait at least a day of uptime to get accurated results. In fact, running
**mysqltuner** on a fresh restarted server is completely useless.
**Seriously - please review the FAQ section below.** **Seriously - please review the FAQ section below.**
@ -96,13 +99,13 @@ Optional Sysschema installation for MySQL 5.6
Sysschema is installed by default under MySQL 5.7 and MySQL 8 from Oracle. Sysschema is installed by default under MySQL 5.7 and MySQL 8 from Oracle.
By default, on MySQL 5.6/5.7/8, performance schema is enabled by default. By default, on MySQL 5.6/5.7/8, performance schema is enabled by default.
For previous 5.6 version, you can follow this command to create a new database sys containing very useful view on Performance schema: For previous 5.6 version, you can follow this command to create a new database sys containing very useful view on Performance schema:
curl "https://codeload.github.com/mysql/mysql-sys/zip/master" > sysschema.zip curl "https://codeload.github.com/mysql/mysql-sys/zip/master" > sysschema.zip
# check zip file # check zip file
unzip -l sysschema.zip unzip -l sysschema.zip
unzip sysschema.zip unzip sysschema.zip
cd mysql-sys-master cd mysql-sys-master
mysql -uroot -p < sys_56.sql mysql -uroot -p < sys_56.sql
Optional Performance schema and Sysschema installation for MariaDB 10.x Optional Performance schema and Sysschema installation for MariaDB 10.x
-- --
@ -114,7 +117,7 @@ By default, on MariaDB, performance schema is disabled by default. consider acti
performance_schema = on performance_schema = on
You can follow this command to create a new database sys containing very useful view on Performance schema: You can follow this command to create a new database sys containing very useful view on Performance schema:
curl "https://codeload.github.com/good-dba/mariadb-sys/zip/master" > mariadb-sys.zip curl "https://codeload.github.com/good-dba/mariadb-sys/zip/master" > mariadb-sys.zip
# check zip file # check zip file
unzip -l mariadb-sys.zip unzip -l mariadb-sys.zip
@ -127,7 +130,7 @@ Performance tips
Metadata statistic updates can impact strongly performance of database servers and MySQLTuner. Metadata statistic updates can impact strongly performance of database servers and MySQLTuner.
Be sure that innodb_stats_on_metadata is disabled. Be sure that innodb_stats_on_metadata is disabled.
set global innodb_stats_on_metadata = 0; set global innodb_stats_on_metadata = 0;
Specific usage Specific usage
-- --
@ -152,7 +155,7 @@ __Usage:__ Enable CVE vulnerabilities check for your MariaDB or MySQL version
perl mysqltuner.pl --cvefile=vulnerabilities.csv perl mysqltuner.pl --cvefile=vulnerabilities.csv
__Usage:__ Write your result in a file with information displayed __Usage:__ Write your result in a file with information displayed
perl mysqltuner.pl --outputfile /tmp/result_mysqltuner.txt perl mysqltuner.pl --outputfile /tmp/result_mysqltuner.txt