Mysql

Mysql

MySQL is an open-source relational database management system. Its name is a combination of "My", the name of co-founder Michael Widenius`s daughter, and "SQL", the abbreviation for Structured Query Language.

Available solutions




This template is for Zabbix version: 6.2
Also available for: 6.0 5.4 5.0

Source: https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/db/mysql_agent?at=release/6.2

MySQL by Zabbix agent

Overview

For Zabbix version: 6.2 and higher
The template is developed for monitoring DBMS MySQL and its forks.

This template was tested on:

  • MySQL, version 5.7, 8.0
  • Percona, version 8.0
  • MariaDB, version 10.4, 10.6.8

Setup

See Zabbix template operation for basic instructions.

  1. Install Zabbix agent and MySQL client. If necessary, add the path to the mysql and mysqladmin utilities to the global environment variable PATH.
  2. Copy template_db_mysql.conf into the folder with Zabbix agent configuration (/etc/zabbix/zabbix_agentd.d/ by default). Don't forget to restart Zabbix agent.
  3. Create a MySQL user for monitoring (<password> at your discretion):
CREATE USER 'zbx_monitor'@'%' IDENTIFIED BY '<password>';
GRANT REPLICATION CLIENT,PROCESS,SHOW DATABASES,SHOW VIEW ON *.* TO 'zbx_monitor'@'%';

For more information, please see MySQL documentation https://dev.mysql.com/doc/refman/8.0/en/grant.html

  1. Create .my.cnf in the home directory of Zabbix agent for Linux (/var/lib/zabbix by default ) or my.cnf in c:\ for Windows. The file must have three strings:
[client]
user='zbx_monitor'
password='<password>'

NOTE: Use systemd to start Zabbix agent on Linux OS. For example, in Centos use "systemctl edit zabbix-agent.service" to set the required user to start the Zabbix agent.

Add the rule to the SELinux policy (example for Centos):

# cat <<EOF > zabbix_home.te
module zabbix_home 1.0;

require {
        type zabbix_agent_t;
        type zabbix_var_lib_t;
        type mysqld_etc_t;
        type mysqld_port_t;
        type mysqld_var_run_t;
        class file { open read };
        class tcp_socket name_connect;
        class sock_file write;
}

#============= zabbix_agent_t ==============

allow zabbix_agent_t zabbix_var_lib_t:file read;
allow zabbix_agent_t zabbix_var_lib_t:file open;
allow zabbix_agent_t mysqld_etc_t:file read;
allow zabbix_agent_t mysqld_port_t:tcp_socket name_connect;
allow zabbix_agent_t mysqld_var_run_t:sock_file write;
EOF
# checkmodule -M -m -o zabbix_home.mod zabbix_home.te
# semodule_package -o zabbix_home.pp -m zabbix_home.mod
# semodule -i zabbix_home.pp
# restorecon -R /var/lib/zabbix

Zabbix configuration

No specific Zabbix configuration is required.

Macros used

Name Description Default
{$MYSQL.ABORTED_CONN.MAX.WARN}

The number of failed attempts to connect to the MySQL server for trigger expression.

 3
{$MYSQL.BUFF_UTIL.MIN.WARN}

The minimum buffer pool utilization in percentage for trigger expression.

 50
{$MYSQL.CREATED_TMP_DISK_TABLES.MAX.WARN}

The maximum number of created tmp tables on a disk per second for trigger expressions.

 10
{$MYSQL.CREATED_TMP_FILES.MAX.WARN}

The maximum number of created tmp files on a disk per second for trigger expressions.

 10
{$MYSQL.CREATED_TMP_TABLES.MAX.WARN}

The maximum number of created tmp tables in memory per second for trigger expressions.

 30
{$MYSQL.HOST}

Hostname or IP of MySQL host or container.

 127.0.0.1
{$MYSQL.INNODB_LOG_FILES}

Number of physical files in the InnoDB redo log for calculating innodb_log_file_size.

 2
{$MYSQL.PORT}

MySQL service port.

 3306
{$MYSQL.REPL_LAG.MAX.WARN}

The lag of slave from master for trigger expression.

 30m
{$MYSQL.SLOW_QUERIES.MAX.WARN}

The number of slow queries for trigger expression.

 3

Template links

There are no template links in this template.

Discovery rules

Name Description Type Key and additional info
Database discovery

Scanning databases in DBMS.

 ZABBIX_PASSIVE mysql.db.discovery["{$MYSQL.HOST}","{$MYSQL.PORT}"]

Preprocessing:

- JAVASCRIPT: return JSON.stringify(value.split("\n").map(function (name) { return ({"{#DBNAME}": name}); }));

- DISCARD_UNCHANGED_HEARTBEAT: 1d

Filter:

AND_OR

- {#DBNAME} NOT_MATCHES_REGEX information_schema
MariaDB discovery

Additional metrics if MariaDB is used.

 DEPENDENT mysql.extra_metric.discovery

Preprocessing:

- JAVASCRIPT: return JSON.stringify(value.search('MariaDB')>-1 ? [{'{#SINGLETON}': ''}] : []);
Replication discovery

If "show slave status" returns Master_Host, "Replication: *" items are created.

 ZABBIX_PASSIVE mysql.replication.discovery["{$MYSQL.HOST}","{$MYSQL.PORT}"]

Preprocessing:

- JAVASCRIPT: The text is too long. Please see the template.

- DISCARD_UNCHANGED_HEARTBEAT: 1d

Items collected

Group Name Description Type Key and additional info
MySQL MySQL: Status ZABBIX_PASSIVE mysql.ping["{$MYSQL.HOST}","{$MYSQL.PORT}"]

Preprocessing:

- JAVASCRIPT: return value.indexOf('is alive') !== -1 ? 1 : 0;

- DISCARD_UNCHANGED_HEARTBEAT: 10m
MySQL MySQL: Version ZABBIX_PASSIVE mysql.version["{$MYSQL.HOST}","{$MYSQL.PORT}"]

Preprocessing:

- REGEX: (Server version)\s+(.+) \2

- DISCARD_UNCHANGED_HEARTBEAT: 1d
MySQL MySQL: Uptime

The amount of seconds that the server has been up.

 DEPENDENT mysql.uptime

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Uptime']/field[@name='Value']/text()
MySQL MySQL: Aborted clients per second

Number of connections that were aborted because the client died without closing the connection properly.

 DEPENDENT mysql.aborted_clients.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Aborted_clients']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Aborted connections per second

Number of failed attempts to connect to the MySQL server.

 DEPENDENT mysql.aborted_connects.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Aborted_connects']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Connection errors accept per second

Number of errors that occurred during calls to accept() on the listening port.

 DEPENDENT mysql.connection_errors_accept.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Connection_errors_accept']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Connection errors internal per second

Number of refused connections due to internal server errors, for example, out of memory errors, or failed thread starts.

 DEPENDENT mysql.connection_errors_internal.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Connection_errors_internal']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Connection errors max connections per second

Number of refused connections due to the max_connections limit being reached.

 DEPENDENT mysql.connection_errors_max_connections.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Connection_errors_max_connections']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Connection errors peer address per second

Number of errors while searching for the connecting client IP address.

 DEPENDENT mysql.connection_errors_peer_address.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Connection_errors_peer_address']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Connection errors select per second

Number of errors during calls to select() or poll() on the listening port. The client would not necessarily have been rejected in these cases.

 DEPENDENT mysql.connection_errors_select.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Connection_errors_select']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Connection errors tcpwrap per second

Number of connections the libwrap library has refused.

 DEPENDENT mysql.connection_errors_tcpwrap.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Connection_errors_tcpwrap']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Connections per second

Number of connection attempts (successful or not) to the MySQL server.

 DEPENDENT mysql.connections.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Connections']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Max used connections

The maximum number of connections that have been in use simultaneously since the server start.

 DEPENDENT mysql.max_used_connections

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Max_used_connections']/field[@name='Value']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 1h
MySQL MySQL: Threads cached

Number of threads in the thread cache.

 DEPENDENT mysql.threads_cached

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Threads_cached']/field[@name='Value']/text()
MySQL MySQL: Threads connected

Number of currently open connections.

 DEPENDENT mysql.threads_connected

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Threads_connected']/field[@name='Value']/text()
MySQL MySQL: Threads created per second

Number of threads created to handle connections. If Threads_created is big, you may want to increase the thread_cache_size value. The cache miss rate can be calculated as Threads_created/Connections.

 DEPENDENT mysql.threads_created.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Threads_created']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Threads running

Number of threads which are not sleeping.

 DEPENDENT mysql.threads_running

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Threads_running']/field[@name='Value']/text()
MySQL MySQL: Buffer pool efficiency

The item shows how effectively the buffer pool is serving reads.

 CALCULATED mysql.buffer_pool_efficiency

Expression:

last(//mysql.innodb_buffer_pool_reads) / ( last(//mysql.innodb_buffer_pool_read_requests) + ( last(//mysql.innodb_buffer_pool_read_requests) = 0 ) ) * 100 * ( last(//mysql.innodb_buffer_pool_read_requests) > 0 )
MySQL MySQL: Buffer pool utilization

Ratio of used to total pages in the buffer pool.

 CALCULATED mysql.buffer_pool_utilization

Expression:

( last(//mysql.innodb_buffer_pool_pages_total) - last(//mysql.innodb_buffer_pool_pages_free) ) / ( last(//mysql.innodb_buffer_pool_pages_total) + ( last(//mysql.innodb_buffer_pool_pages_total) = 0 ) ) * 100 * ( last(//mysql.innodb_buffer_pool_pages_total) > 0 )
MySQL MySQL: Created tmp files on disk per second

How many temporary files mysqld has created.

 DEPENDENT mysql.created_tmp_files.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Created_tmp_files']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Created tmp tables on disk per second

Number of internal on-disk temporary tables created by the server while executing statements.

 DEPENDENT mysql.created_tmp_disk_tables.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Created_tmp_disk_tables']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Created tmp tables on memory per second

Number of internal temporary tables created by the server while executing statements.

 DEPENDENT mysql.created_tmp_tables.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Created_tmp_tables']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: InnoDB buffer pool pages free

The total size of the InnoDB buffer pool, in pages.

 DEPENDENT mysql.innodb_buffer_pool_pages_free

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_buffer_pool_pages_free']/field[@name='Value']/text()
MySQL MySQL: InnoDB buffer pool pages total

The total size of the InnoDB buffer pool, in pages.

 DEPENDENT mysql.innodb_buffer_pool_pages_total

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_buffer_pool_pages_total']/field[@name='Value']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 1h
MySQL MySQL: InnoDB buffer pool read requests per second

Number of logical read requests per second.

 DEPENDENT mysql.innodb_buffer_pool_read_requests.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_buffer_pool_read_requests']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: InnoDB buffer pool reads per second

Number of logical reads per second that InnoDB could not satisfy from the buffer pool, and had to read directly from the disk.

 DEPENDENT mysql.innodb_buffer_pool_reads.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_buffer_pool_reads']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: InnoDB row lock time

The total time spent in acquiring row locks for InnoDB tables, in milliseconds.

 DEPENDENT mysql.innodb_row_lock_time

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_row_lock_time']/field[@name='Value']/text()

- MULTIPLIER: 0.001

- DISCARD_UNCHANGED_HEARTBEAT: 1h
MySQL MySQL: InnoDB row lock time max

The maximum time to acquire a row lock for InnoDB tables, in milliseconds.

 DEPENDENT mysql.innodb_row_lock_time_max

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_row_lock_time_max']/field[@name='Value']/text()

- MULTIPLIER: 0.001

- DISCARD_UNCHANGED_HEARTBEAT: 1h
MySQL MySQL: InnoDB row lock waits

Number of times operations on InnoDB tables had to wait for a row lock.

 DEPENDENT mysql.innodb_row_lock_waits

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_row_lock_waits']/field[@name='Value']/text()
MySQL MySQL: Slow queries per second

Number of queries that have taken more than long_query_time seconds.

 DEPENDENT mysql.slow_queries.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Slow_queries']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Bytes received

Number of bytes received from all clients.

 DEPENDENT mysql.bytes_received.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Bytes_received']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Bytes sent

Number of bytes sent to all clients.

 DEPENDENT mysql.bytes_sent.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Bytes_sent']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Command Delete per second

The Com_delete counter variable indicates the number of times the delete statement has been executed.

 DEPENDENT mysql.com_delete.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Com_delete']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Command Insert per second

The Com_insert counter variable indicates the number of times the insert statement has been executed.

 DEPENDENT mysql.com_insert.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Com_insert']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Command Select per second

The Com_select counter variable indicates the number of times the select statement has been executed.

 DEPENDENT mysql.com_select.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Com_select']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Command Update per second

The Com_update counter variable indicates the number of times the update statement has been executed.

 DEPENDENT mysql.com_update.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Com_update']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Queries per second

Number of statements executed by the server. This variable includes statements executed within stored programs, unlike the Questions variable.

 DEPENDENT mysql.queries.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Queries']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Questions per second

Number of statements executed by the server. This includes only statements sent to the server by clients and not statements executed within stored programs, unlike the Queries variable.

 DEPENDENT mysql.questions.rate

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Questions']/field[@name='Value']/text()

- CHANGE_PER_SECOND
MySQL MySQL: Binlog cache disk use

Number of transactions that used a temporary disk cache because they could not fit in the regular binary log cache, being larger than binlog_cache_size.

 DEPENDENT mysql.binlog_cache_disk_use

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Binlog_cache_disk_use']/field[@name='Value']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 6h
MySQL MySQL: Innodb buffer pool wait free

Number of times InnoDB waited for a free page before reading or creating a page. Normally, writes to the InnoDB buffer pool happen in the background. When no clean pages are available, dirty pages are flushed first in order to free some up. This counts the numbers of wait for this operation to finish. If this value is not small, look at the increasing innodb_buffer_pool_size.

 DEPENDENT mysql.innodb_buffer_pool_wait_free

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_buffer_pool_wait_free']/field[@name='Value']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 6h
MySQL MySQL: Innodb number open files

Number of open files held by InnoDB. InnoDB only.

 DEPENDENT mysql.innodb_num_open_files

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_num_open_files']/field[@name='Value']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 6h
MySQL MySQL: Open table definitions

Number of cached table definitions.

 DEPENDENT mysql.open_table_definitions

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Open_table_definitions']/field[@name='Value']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 6h
MySQL MySQL: Open tables

Number of tables that are open.

 DEPENDENT mysql.open_tables

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Open_tables']/field[@name='Value']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 6h
MySQL MySQL: Innodb log written

Number of bytes written to the InnoDB log.

 DEPENDENT mysql.innodb_os_log_written

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_os_log_written']/field[@name='Value']/text()
MySQL MySQL: Calculated value of innodb_log_file_size

Calculated by (innodb_os_log_written-innodb_os_log_written(time shift -1h))/{$MYSQL.INNODB_LOG_FILES} value of the innodb_log_file_size. Innodb_log_file_size is the size in bytes of the each InnoDB redo log file in the log group. The combined size can be no more than 512GB. Larger values mean less disk I/O due to less flushing checkpoint activity, but also slower recovery from a crash.

 CALCULATED mysql.innodb_log_file_size

Preprocessing:

- DISCARD_UNCHANGED_HEARTBEAT: 6h

Expression:

(last(//mysql.innodb_os_log_written) - last(//mysql.innodb_os_log_written,#1:now-1h)) / {$MYSQL.INNODB_LOG_FILES}
MySQL MySQL: Size of database {#DBNAME}

-

 ZABBIX_PASSIVE mysql.dbsize["{$MYSQL.HOST}","{$MYSQL.PORT}","{#DBNAME}"]

Preprocessing:

- DISCARD_UNCHANGED_HEARTBEAT: 1h
MySQL MySQL: Replication Slave SQL Running State {#MASTER_HOST}

This shows the state of the SQL driver threads.

 DEPENDENT mysql.slave_sql_running_state["{#MASTER_HOST}"]

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Slave_SQL_Running_State']/field[@name='Value']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 6h
MySQL MySQL: Replication Seconds Behind Master {#MASTERHOST}

The number of seconds that the slave SQL thread is behind processing the master binary log.

A high number (or an increasing one) can indicate that the slave is unable to handle events

from the master in a timely fashion.

 DEPENDENT mysql.seconds_behind_master["{#MASTERHOST}"]

Preprocessing:

- XMLPATH: /resultset/row/field[@name='Seconds_Behind_Master']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 1h

- NOT_MATCHES_REGEX: null

⛔️ON_FAIL: CUSTOM_ERROR -> Replication is not performed.
MySQL MySQL: Replication Slave IO Running {#MASTERHOST}

Whether the I/O thread for reading the master's binary log is running.

Normally, you want this to be Yes unless you have not yet started replication or have

explicitly stopped it with STOP SLAVE.

 DEPENDENT mysql.slave_io_running["{#MASTERHOST}"]

Preprocessing:

- XMLPATH: /resultset/row/field[@name='Slave_IO_Running']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 1h
MySQL MySQL: Replication Slave SQL Running {#MASTERHOST}

Whether the SQL thread for executing events in the relay log is running.

As with the I/O thread, this should normally be Yes.

 DEPENDENT mysql.slave_sql_running["{#MASTERHOST}"]

Preprocessing:

- XMLPATH: /resultset/row/field[@name='Slave_SQL_Running']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 1h
MySQL MySQL: Binlog commits

Total number of transactions committed to the binary log.

 DEPENDENT mysql.binlog_commits[{#SINGLETON}]

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Binlog_commits']/field[@name='Value']/text()
MySQL MySQL: Binlog group commits

Total number of group commits done to the binary log.

 DEPENDENT mysql.binlog_group_commits[{#SINGLETON}]

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Binlog_group_commits']/field[@name='Value']/text()
MySQL MySQL: Master GTID wait count

The number of times MASTER_GTID_WAIT called.

 DEPENDENT mysql.master_gtid_wait_count[{#SINGLETON}]

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Master_gtid_wait_count']/field[@name='Value']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 6h
MySQL MySQL: Master GTID wait time

Total number of time spent in MASTER_GTID_WAIT.

 DEPENDENT mysql.master_gtid_wait_time[{#SINGLETON}]

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Master_gtid_wait_time']/field[@name='Value']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 6h
MySQL MySQL: Master GTID wait timeouts

Number of timeouts occurring in MASTER_GTID_WAIT.

 DEPENDENT mysql.master_gtid_wait_timeouts[{#SINGLETON}]

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Master_gtid_wait_timeouts']/field[@name='Value']/text()

- DISCARD_UNCHANGED_HEARTBEAT: 6h
Zabbix raw items MySQL: Get status variables

The item gets server global status information.

 ZABBIX_PASSIVE mysql.get_status_variables["{$MYSQL.HOST}","{$MYSQL.PORT}"]
Zabbix raw items MySQL: InnoDB buffer pool read requests

Number of logical read requests.

 DEPENDENT mysql.innodb_buffer_pool_read_requests

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_buffer_pool_read_requests']/field[@name='Value']/text()
Zabbix raw items MySQL: InnoDB buffer pool reads

Number of logical reads that InnoDB could not satisfy from the buffer pool, and had to read directly from the disk.

 DEPENDENT mysql.innodb_buffer_pool_reads

Preprocessing:

- XMLPATH: /resultset/row[field/text()='Innodb_buffer_pool_reads']/field[@name='Value']/text()
Zabbix raw items MySQL: Replication Slave status {#MASTERHOST}

The item gets status information on the essential parameters of the slave threads.

 ZABBIX_PASSIVE mysql.slave_status["{$MYSQL.HOST}","{$MYSQL.PORT}","{#MASTERHOST}"]

Triggers

Name Description Expression Severity Dependencies and additional info
MySQL: Service is down

-

 last(/MySQL by Zabbix agent/mysql.ping["{$MYSQL.HOST}","{$MYSQL.PORT}"])=0 HIGH
MySQL: Version has changed

MySQL version has changed. Ack to close.

 last(/MySQL by Zabbix agent/mysql.version["{$MYSQL.HOST}","{$MYSQL.PORT}"],#1)<>last(/MySQL by Zabbix agent/mysql.version["{$MYSQL.HOST}","{$MYSQL.PORT}"],#2) and length(last(/MySQL by Zabbix agent/mysql.version["{$MYSQL.HOST}","{$MYSQL.PORT}"]))>0 INFO

Manual close: YES
MySQL: Service has been restarted

MySQL uptime is less than 10 minutes.

 last(/MySQL by Zabbix agent/mysql.uptime)<10m INFO
MySQL: Failed to fetch info data

Zabbix has not received data for items for the last 30 minutes.

 nodata(/MySQL by Zabbix agent/mysql.uptime,30m)=1 INFO

Depends on:

- MySQL: Service is down
MySQL: Server has aborted connections

The number of failed attempts to connect to the MySQL server is more than {$MYSQL.ABORTED_CONN.MAX.WARN} in the last 5 minutes.

 min(/MySQL by Zabbix agent/mysql.aborted_connects.rate,5m)>{$MYSQL.ABORTED_CONN.MAX.WARN} AVERAGE

Depends on:

- MySQL: Refused connections
MySQL: Refused connections

Number of refused connections due to the max_connections limit being reached.

 last(/MySQL by Zabbix agent/mysql.connection_errors_max_connections.rate)>0 AVERAGE
MySQL: Buffer pool utilization is too low

The buffer pool utilization is less than {$MYSQL.BUFF_UTIL.MIN.WARN}% in the last 5 minutes. This means that there is a lot of unused RAM allocated for the buffer pool, which you can easily reallocate at the moment.

 max(/MySQL by Zabbix agent/mysql.buffer_pool_utilization,5m)<{$MYSQL.BUFF_UTIL.MIN.WARN} WARNING
MySQL: Number of temporary files created per second is high

Possibly the application using the database is in need of query optimization.

 min(/MySQL by Zabbix agent/mysql.created_tmp_files.rate,5m)>{$MYSQL.CREATED_TMP_FILES.MAX.WARN} WARNING
MySQL: Number of on-disk temporary tables created per second is high

Possibly the application using the database is in need of query optimization.

 min(/MySQL by Zabbix agent/mysql.created_tmp_disk_tables.rate,5m)>{$MYSQL.CREATED_TMP_DISK_TABLES.MAX.WARN} WARNING
MySQL: Number of internal temporary tables created per second is high

Possibly the application using the database is in need of query optimization.

 min(/MySQL by Zabbix agent/mysql.created_tmp_tables.rate,5m)>{$MYSQL.CREATED_TMP_TABLES.MAX.WARN} WARNING
MySQL: Server has slow queries

The number of slow queries is more than {$MYSQL.SLOW_QUERIES.MAX.WARN} in the last 5 minutes.

 min(/MySQL by Zabbix agent/mysql.slow_queries.rate,5m)>{$MYSQL.SLOW_QUERIES.MAX.WARN} WARNING
MySQL: Replication lag is too high

-

 min(/MySQL by Zabbix agent/mysql.seconds_behind_master["{#MASTERHOST}"],5m)>{$MYSQL.REPL_LAG.MAX.WARN} WARNING
MySQL: The slave I/O thread is not running

Whether the I/O thread for reading the master's binary log is running.

 count(/MySQL by Zabbix agent/mysql.slave_io_running["{#MASTERHOST}"],#1,"eq","No")=1 AVERAGE
MySQL: The slave I/O thread is not connected to a replication master

-

 count(/MySQL by Zabbix agent/mysql.slave_io_running["{#MASTERHOST}"],#1,"ne","Yes")=1 WARNING

Depends on:

- MySQL: The slave I/O thread is not running
MySQL: The SQL thread is not running

Whether the SQL thread for executing events in the relay log is running.

 count(/MySQL by Zabbix agent/mysql.slave_sql_running["{#MASTERHOST}"],#1,"eq","No")=1 WARNING

Depends on:

- MySQL: The slave I/O thread is not running

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