Percona-Tookit工具包之pt-find

 

Preface

 

    We used to use "find" command in linux or AIX when we need to get a certain file but cannot rember the precise name.We will execute "find /pathtobegin -name xxx" in our OS prompt.Is there any tool can find a specific table of MySQL database which similarly as "find" does?

 

Introduce

 

    pt-find is a very useful tool to find out a sepcific table with a condition you've specified.It even can execute a sql operation when finding it simutaneously.

 

Procedure

 

Usage

 pt-find [OPTIONS] [DATABASES]

Common parameters

 Options:
 --day-start //Specify the meassure mothed of time when using "--cmin,--mmin,--ctime,--mtime,etc".
 --or //Change the combination test behavior as "or" instead of default "and".

 Actions:
 --exec //Specify the executing sql statement with each item found.
 --exec-plus //Specify the executing sql statement with all items at once.
 --print //Print the target database and table name.
 --printf //Print with a certain format.

 Tests:
 --autoinc //Speicfy a value of auto_increment to test whether has auto_inrcrement column.
 --avgrowlen //Specify the average
 --cmin //Specify the target table created n minutes ago.
 --ctime //Specify the target table created n days ago.
 --mmin //Specify the target table modified n minutes ago.
 --mtime //Specify the target table modified n days ago.
 --kmim //Specify the target table checked n minutes ago.
 --ktime //Specify the target table checked n days ago.
 --rowformat //Specify the row format of tables to match pattern.
 --rows //Specify the rows the table contains.
 --tablesize //Specify the size the table is.
 --empty //Specify the talbe which has no rows.
 --engines //Specify the engine of tabls.

Example

 

Find out all tables in all databases.

 [root@zlm2 :: /data/mysql/mysql3308/data]
 #pt-find -h192.168.1. -P3308 -uzlm -pzlmzlm
 `mysql`.`columns_priv`
 `mysql`.`db`
 `mysql`.`engine_cost`
 `mysql`.`event`
 `mysql`.`func`
 `mysql`.`general_log`
 `mysql`.`gtid_executed`
 `mysql`.`help_category`
 `mysql`.`help_keyword`
 `mysql`.`help_relation`
 `mysql`.`help_topic`
 `mysql`.`innodb_index_stats`
 `mysql`.`innodb_table_stats`
 `mysql`.`ndb_binlog_index`
 `mysql`.`plugin`
 `mysql`.`proc`
 `mysql`.`procs_priv`
 `mysql`.`proxies_priv`
 `mysql`.`server_cost`
 `mysql`.`servers`
 `mysql`.`slave_master_info`
 `mysql`.`slave_relay_log_info`
 `mysql`.`slave_worker_info`
 `mysql`.`slow_log`
 `mysql`.`tables_priv`
 `mysql`.`time_zone`
 `mysql`.`time_zone_leap_second`
 `mysql`.`time_zone_name`
 `mysql`.`time_zone_transition`
 `mysql`.`time_zone_transition_type`
 `mysql`.`user`
 `performance_schema`.`accounts`
 `performance_schema`.`cond_instances`
 `performance_schema`.`events_stages_current`
 `performance_schema`.`events_stages_history`
 `performance_schema`.`events_stages_history_long`
 `performance_schema`.`events_stages_summary_by_account_by_event_name`
 `performance_schema`.`events_stages_summary_by_host_by_event_name`
 `performance_schema`.`events_stages_summary_by_thread_by_event_name`
 `performance_schema`.`events_stages_summary_by_user_by_event_name`
 `performance_schema`.`events_stages_summary_global_by_event_name`
 `performance_schema`.`events_statements_current`
 `performance_schema`.`events_statements_history`
 `performance_schema`.`events_statements_history_long`
 `performance_schema`.`events_statements_summary_by_account_by_event_name`
 `performance_schema`.`events_statements_summary_by_digest`
 `performance_schema`.`events_statements_summary_by_host_by_event_name`
 `performance_schema`.`events_statements_summary_by_program`
 `performance_schema`.`events_statements_summary_by_thread_by_event_name`
 `performance_schema`.`events_statements_summary_by_user_by_event_name`
 `performance_schema`.`events_statements_summary_global_by_event_name`
 `performance_schema`.`events_transactions_current`
 `performance_schema`.`events_transactions_history`
 `performance_schema`.`events_transactions_history_long`
 `performance_schema`.`events_transactions_summary_by_account_by_event_name`
 `performance_schema`.`events_transactions_summary_by_host_by_event_name`
 `performance_schema`.`events_transactions_summary_by_thread_by_event_name`
 `performance_schema`.`events_transactions_summary_by_user_by_event_name`
 `performance_schema`.`events_transactions_summary_global_by_event_name`
 `performance_schema`.`events_waits_current`
 `performance_schema`.`events_waits_history`
 `performance_schema`.`events_waits_history_long`
 `performance_schema`.`events_waits_summary_by_account_by_event_name`
 `performance_schema`.`events_waits_summary_by_host_by_event_name`
 `performance_schema`.`events_waits_summary_by_instance`
 `performance_schema`.`events_waits_summary_by_thread_by_event_name`
 `performance_schema`.`events_waits_summary_by_user_by_event_name`
 `performance_schema`.`events_waits_summary_global_by_event_name`
 `performance_schema`.`file_instances`
 `performance_schema`.`file_summary_by_event_name`
 `performance_schema`.`file_summary_by_instance`
 `performance_schema`.`global_status`
 `performance_schema`.`global_variables`
 `performance_schema`.`host_cache`
 `performance_schema`.`hosts`
 `performance_schema`.`memory_summary_by_account_by_event_name`
 `performance_schema`.`memory_summary_by_host_by_event_name`
 `performance_schema`.`memory_summary_by_thread_by_event_name`
 `performance_schema`.`memory_summary_by_user_by_event_name`
 `performance_schema`.`memory_summary_global_by_event_name`
 `performance_schema`.`metadata_locks`
 `performance_schema`.`mutex_instances`
 `performance_schema`.`objects_summary_global_by_type`
 `performance_schema`.`performance_timers`
 `performance_schema`.`prepared_statements_instances`
 `performance_schema`.`pxc_cluster_view`
 `performance_schema`.`replication_applier_configuration`
 `performance_schema`.`replication_applier_status`
 `performance_schema`.`replication_applier_status_by_coordinator`
 `performance_schema`.`replication_applier_status_by_worker`
 `performance_schema`.`replication_connection_configuration`
 `performance_schema`.`replication_connection_status`
 `performance_schema`.`replication_group_member_stats`
 `performance_schema`.`replication_group_members`
 `performance_schema`.`rwlock_instances`
 `performance_schema`.`session_account_connect_attrs`
 `performance_schema`.`session_connect_attrs`
 `performance_schema`.`session_status`
 `performance_schema`.`session_variables`
 `performance_schema`.`setup_actors`
 `performance_schema`.`setup_consumers`
 `performance_schema`.`setup_instruments`
 `performance_schema`.`setup_objects`
 `performance_schema`.`setup_timers`
 `performance_schema`.`socket_instances`
 `performance_schema`.`socket_summary_by_event_name`
 `performance_schema`.`socket_summary_by_instance`
 `performance_schema`.`status_by_account`
 `performance_schema`.`status_by_host`
 `performance_schema`.`status_by_thread`
 `performance_schema`.`status_by_user`
 `performance_schema`.`table_handles`
 `performance_schema`.`table_io_waits_summary_by_index_usage`
 `performance_schema`.`table_io_waits_summary_by_table`
 `performance_schema`.`table_lock_waits_summary_by_table`
 `performance_schema`.`threads`
 `performance_schema`.`user_variables_by_thread`
 `performance_schema`.`users`
 `performance_schema`.`variables_by_thread`
 `sys`.`host_summary`
 `sys`.`host_summary_by_file_io`
 `sys`.`host_summary_by_file_io_type`
 `sys`.`host_summary_by_stages`
 `sys`.`host_summary_by_statement_latency`
 `sys`.`host_summary_by_statement_type`
 `sys`.`innodb_buffer_stats_by_schema`
 `sys`.`innodb_buffer_stats_by_table`
 `sys`.`innodb_lock_waits`
 `sys`.`io_by_thread_by_latency`
 `sys`.`io_global_by_file_by_bytes`
 `sys`.`io_global_by_file_by_latency`
 `sys`.`io_global_by_wait_by_bytes`
 `sys`.`io_global_by_wait_by_latency`
 `sys`.`latest_file_io`
 `sys`.`memory_by_host_by_current_bytes`
 `sys`.`memory_by_thread_by_current_bytes`
 `sys`.`memory_by_user_by_current_bytes`
 `sys`.`memory_global_by_current_bytes`
 `sys`.`memory_global_total`
 `sys`.`metrics`
 `sys`.`processlist`
 `sys`.`ps_check_lost_instrumentation`
 `sys`.`schema_auto_increment_columns`
 `sys`.`schema_index_statistics`
 `sys`.`schema_object_overview`
 `sys`.`schema_redundant_indexes`
 `sys`.`schema_table_lock_waits`
 `sys`.`schema_table_statistics`
 `sys`.`schema_table_statistics_with_buffer`
 `sys`.`schema_tables_with_full_table_scans`
 `sys`.`schema_unused_indexes`
 `sys`.`session`
 `sys`.`session_ssl_status`
 `sys`.`statement_analysis`
 `sys`.`statements_with_errors_or_warnings`
 `sys`.`statements_with_full_table_scans`
 `sys`.`statements_with_runtimes_in_95th_percentile`
 `sys`.`statements_with_sorting`
 `sys`.`statements_with_temp_tables`
 `sys`.`sys_config`
 `sys`.`user_summary`
 `sys`.`user_summary_by_file_io`
 `sys`.`user_summary_by_file_io_type`
 `sys`.`user_summary_by_stages`
 `sys`.`user_summary_by_statement_latency`
 `sys`.`user_summary_by_statement_type`
 `sys`.`version`
 `sys`.`wait_classes_global_by_avg_latency`
 `sys`.`wait_classes_global_by_latency`
 `sys`.`waits_by_host_by_latency`
 `sys`.`waits_by_user_by_latency`
 `sys`.`waits_global_by_latency`
 `sys`.`x$host_summary`
 `sys`.`x$host_summary_by_file_io`
 `sys`.`x$host_summary_by_file_io_type`
 `sys`.`x$host_summary_by_stages`
 `sys`.`x$host_summary_by_statement_latency`
 `sys`.`x$host_summary_by_statement_type`
 `sys`.`x$innodb_buffer_stats_by_schema`
 `sys`.`x$innodb_buffer_stats_by_table`
 `sys`.`x$innodb_lock_waits`
 `sys`.`x$io_by_thread_by_latency`
 `sys`.`x$io_global_by_file_by_bytes`
 `sys`.`x$io_global_by_file_by_latency`
 `sys`.`x$io_global_by_wait_by_bytes`
 `sys`.`x$io_global_by_wait_by_latency`
 `sys`.`x$latest_file_io`
 `sys`.`x$memory_by_host_by_current_bytes`
 `sys`.`x$memory_by_thread_by_current_bytes`
 `sys`.`x$memory_by_user_by_current_bytes`
 `sys`.`x$memory_global_by_current_bytes`
 `sys`.`x$memory_global_total`
 `sys`.`x$processlist`
 `sys`.`x$ps_digest_95th_percentile_by_avg_us`
 `sys`.`x$ps_digest_avg_latency_distribution`
 `sys`.`x$ps_schema_table_statistics_io`
 `sys`.`x$schema_flattened_keys`
 `sys`.`x$schema_index_statistics`
 `sys`.`x$schema_table_lock_waits`
 `sys`.`x$schema_table_statistics`
 `sys`.`x$schema_table_statistics_with_buffer`
 `sys`.`x$schema_tables_with_full_table_scans`
 `sys`.`x$session`
 `sys`.`x$statement_analysis`
 `sys`.`x$statements_with_errors_or_warnings`
 `sys`.`x$statements_with_full_table_scans`
 `sys`.`x$statements_with_runtimes_in_95th_percentile`
 `sys`.`x$statements_with_sorting`
 `sys`.`x$statements_with_temp_tables`
 `sys`.`x$user_summary`
 `sys`.`x$user_summary_by_file_io`
 `sys`.`x$user_summary_by_file_io_type`
 `sys`.`x$user_summary_by_stages`
 `sys`.`x$user_summary_by_statement_latency`
 `sys`.`x$user_summary_by_statement_type`
 `sys`.`x$wait_classes_global_by_avg_latency`
 `sys`.`x$wait_classes_global_by_latency`
 `sys`.`x$waits_by_host_by_latency`
 `sys`.`x$waits_by_user_by_latency`
 `sys`.`x$waits_global_by_latency`
 `zlm`.`t1`
 `zlm`.`t2`

 //It shows all the tables in all databases one line each table.

Find out all the MyISAM tables.

 [root@zlm2 :: /data/mysql/mysql3308/data]
 #pt-find -h192.168.1. -P3308 -uzlm -pzlmzlm --engine=MyISAM
 `mysql`.`columns_priv`
 `mysql`.`db`
 `mysql`.`event`
 `mysql`.`func`
 `mysql`.`ndb_binlog_index`
 `mysql`.`proc`
 `mysql`.`procs_priv`
 `mysql`.`proxies_priv`
 `mysql`.`tables_priv`
 `mysql`.`user`

Find out all the tables in database "zlm" which does not have auto_increment column.

 [root@zlm2 :: /data/mysql/mysql3308/data]
 #pt-find -h192.168.1. -P3308 -uzlm -pzlmzlm --dblike=zlm --autoinc=
 `zlm`.`t1`
 `zlm`.`t2`

Find out all the tables which is empty.

 [root@zlm2 :: /data/mysql/mysql3308/data]
 #pt-find -h192.168.1. -P3308 -uzlm -pzlmzlm --empty
 `mysql`.`columns_priv`
 `mysql`.`event`
 `mysql`.`func`
 `mysql`.`ndb_binlog_index`
 `mysql`.`plugin`
 `mysql`.`procs_priv`
 `mysql`.`servers`
 `mysql`.`slave_master_info`
 `mysql`.`slave_relay_log_info`
 `mysql`.`slave_worker_info`
 `mysql`.`time_zone`
 `mysql`.`time_zone_leap_second`
 `mysql`.`time_zone_name`
 `mysql`.`time_zone_transition`
 `mysql`.`time_zone_transition_type`
 `performance_schema`.`metadata_locks`
 `performance_schema`.`prepared_statements_instances`
 `performance_schema`.`replication_group_member_stats`
 `performance_schema`.`replication_group_members`

Find out all the tables sorted descendingly by size.

 [root@zlm2 :: /data/mysql/mysql3308/data]
 #pt-find -h192.168.1. -P3308 -uzlm -pzlmzlm --printf "%T\t%D.%N\n" | sort -rn
     `mysql`.`help_topic`
     `mysql`.`proc`
     `mysql`.`help_keyword`
     `mysql`.`help_relation`
     `mysql`.`help_category`
     `zlm`.`t2`
     `zlm`.`t1`
     `sys`.`sys_config`
     `mysql`.`time_zone_transition_type`
     `mysql`.`time_zone_transition`
     `mysql`.`time_zone_name`
     `mysql`.`time_zone_leap_second`
     `mysql`.`time_zone`
     `mysql`.`slave_worker_info`
     `mysql`.`slave_relay_log_info`
     `mysql`.`slave_master_info`
     `mysql`.`servers`
     `mysql`.`server_cost`
     `mysql`.`plugin`
     `mysql`.`innodb_table_stats`
     `mysql`.`innodb_index_stats`
     `mysql`.`gtid_executed`
     `mysql`.`engine_cost`
     `mysql`.`tables_priv`
     `mysql`.`proxies_priv`
     `mysql`.`db`
     `mysql`.`user`
     `mysql`.`procs_priv`
     `mysql`.`columns_priv`
     `mysql`.`event`
     `mysql`.`ndb_binlog_index`
     `mysql`.`func`
     `sys`.`x$waits_global_by_latency`
     `sys`.`x$waits_by_user_by_latency`
     `sys`.`x$waits_by_host_by_latency`
     `sys`.`x$wait_classes_global_by_latency`
     `sys`.`x$wait_classes_global_by_avg_latency`
     `sys`.`x$user_summary_by_statement_type`
     `sys`.`x$user_summary_by_statement_latency`
     `sys`.`x$user_summary_by_stages`
     `sys`.`x$user_summary_by_file_io_type`
     `sys`.`x$user_summary_by_file_io`
     `sys`.`x$user_summary`
     `sys`.`x$statements_with_temp_tables`
     `sys`.`x$statements_with_sorting`
     `sys`.`x$statements_with_runtimes_in_95th_percentile`
     `sys`.`x$statements_with_full_table_scans`
     `sys`.`x$statements_with_errors_or_warnings`
     `sys`.`x$statement_analysis`
     `sys`.`x$session`
     `sys`.`x$schema_tables_with_full_table_scans`
     `sys`.`x$schema_table_statistics_with_buffer`
     `sys`.`x$schema_table_statistics`
     `sys`.`x$schema_table_lock_waits`
     `sys`.`x$schema_index_statistics`
     `sys`.`x$schema_flattened_keys`
     `sys`.`x$ps_schema_table_statistics_io`
     `sys`.`x$ps_digest_avg_latency_distribution`
     `sys`.`x$ps_digest_95th_percentile_by_avg_us`
     `sys`.`x$processlist`
     `sys`.`x$memory_global_total`
     `sys`.`x$memory_global_by_current_bytes`
     `sys`.`x$memory_by_user_by_current_bytes`
     `sys`.`x$memory_by_thread_by_current_bytes`
     `sys`.`x$memory_by_host_by_current_bytes`
     `sys`.`x$latest_file_io`
     `sys`.`x$io_global_by_wait_by_latency`
     `sys`.`x$io_global_by_wait_by_bytes`
     `sys`.`x$io_global_by_file_by_latency`
     `sys`.`x$io_global_by_file_by_bytes`
     `sys`.`x$io_by_thread_by_latency`
     `sys`.`x$innodb_lock_waits`
     `sys`.`x$innodb_buffer_stats_by_table`
     `sys`.`x$innodb_buffer_stats_by_schema`
     `sys`.`x$host_summary_by_statement_type`
     `sys`.`x$host_summary_by_statement_latency`
     `sys`.`x$host_summary_by_stages`
     `sys`.`x$host_summary_by_file_io_type`
     `sys`.`x$host_summary_by_file_io`
     `sys`.`x$host_summary`
     `sys`.`waits_global_by_latency`
     `sys`.`waits_by_user_by_latency`
     `sys`.`waits_by_host_by_latency`
     `sys`.`wait_classes_global_by_latency`
     `sys`.`wait_classes_global_by_avg_latency`
     `sys`.`version`
     `sys`.`user_summary_by_statement_type`
     `sys`.`user_summary_by_statement_latency`
     `sys`.`user_summary_by_stages`
     `sys`.`user_summary_by_file_io_type`
     `sys`.`user_summary_by_file_io`
     `sys`.`user_summary`
     `sys`.`statements_with_temp_tables`
     `sys`.`statements_with_sorting`
     `sys`.`statements_with_runtimes_in_95th_percentile`
     `sys`.`statements_with_full_table_scans`
     `sys`.`statements_with_errors_or_warnings`
     `sys`.`statement_analysis`
     `sys`.`session_ssl_status`
     `sys`.`session`
     `sys`.`schema_unused_indexes`
     `sys`.`schema_tables_with_full_table_scans`
     `sys`.`schema_table_statistics_with_buffer`
     `sys`.`schema_table_statistics`
     `sys`.`schema_table_lock_waits`
     `sys`.`schema_redundant_indexes`
     `sys`.`schema_object_overview`
     `sys`.`schema_index_statistics`
     `sys`.`schema_auto_increment_columns`
     `sys`.`ps_check_lost_instrumentation`
     `sys`.`processlist`
     `sys`.`metrics`
     `sys`.`memory_global_total`
     `sys`.`memory_global_by_current_bytes`
     `sys`.`memory_by_user_by_current_bytes`
     `sys`.`memory_by_thread_by_current_bytes`
     `sys`.`memory_by_host_by_current_bytes`
     `sys`.`latest_file_io`
     `sys`.`io_global_by_wait_by_latency`
     `sys`.`io_global_by_wait_by_bytes`
     `sys`.`io_global_by_file_by_latency`
     `sys`.`io_global_by_file_by_bytes`
     `sys`.`io_by_thread_by_latency`
     `sys`.`innodb_lock_waits`
     `sys`.`innodb_buffer_stats_by_table`
     `sys`.`innodb_buffer_stats_by_schema`
     `sys`.`host_summary_by_statement_type`
     `sys`.`host_summary_by_statement_latency`
     `sys`.`host_summary_by_stages`
     `sys`.`host_summary_by_file_io_type`
     `sys`.`host_summary_by_file_io`
     `sys`.`host_summary`
     `performance_schema`.`variables_by_thread`
     `performance_schema`.`user_variables_by_thread`
     `performance_schema`.`users`
     `performance_schema`.`threads`
     `performance_schema`.`table_lock_waits_summary_by_table`
     `performance_schema`.`table_io_waits_summary_by_table`
     `performance_schema`.`table_io_waits_summary_by_index_usage`
     `performance_schema`.`table_handles`
     `performance_schema`.`status_by_user`
     `performance_schema`.`status_by_thread`
     `performance_schema`.`status_by_host`
     `performance_schema`.`status_by_account`
     `performance_schema`.`socket_summary_by_instance`
     `performance_schema`.`socket_summary_by_event_name`
     `performance_schema`.`socket_instances`
     `performance_schema`.`setup_timers`
     `performance_schema`.`setup_objects`
     `performance_schema`.`setup_instruments`
     `performance_schema`.`setup_consumers`
     `performance_schema`.`setup_actors`
     `performance_schema`.`session_variables`
     `performance_schema`.`session_status`
     `performance_schema`.`session_connect_attrs`
     `performance_schema`.`session_account_connect_attrs`
     `performance_schema`.`rwlock_instances`
     `performance_schema`.`replication_group_member_stats`
     `performance_schema`.`replication_group_members`
     `performance_schema`.`replication_connection_status`
     `performance_schema`.`replication_connection_configuration`
     `performance_schema`.`replication_applier_status_by_worker`
     `performance_schema`.`replication_applier_status_by_coordinator`
     `performance_schema`.`replication_applier_status`
     `performance_schema`.`replication_applier_configuration`
     `performance_schema`.`pxc_cluster_view`
     `performance_schema`.`prepared_statements_instances`
     `performance_schema`.`performance_timers`
     `performance_schema`.`objects_summary_global_by_type`
     `performance_schema`.`mutex_instances`
     `performance_schema`.`metadata_locks`
     `performance_schema`.`memory_summary_global_by_event_name`
     `performance_schema`.`memory_summary_by_user_by_event_name`
     `performance_schema`.`memory_summary_by_thread_by_event_name`
     `performance_schema`.`memory_summary_by_host_by_event_name`
     `performance_schema`.`memory_summary_by_account_by_event_name`
     `performance_schema`.`hosts`
     `performance_schema`.`host_cache`
     `performance_schema`.`global_variables`
     `performance_schema`.`global_status`
     `performance_schema`.`file_summary_by_instance`
     `performance_schema`.`file_summary_by_event_name`
     `performance_schema`.`file_instances`
     `performance_schema`.`events_waits_summary_global_by_event_name`
     `performance_schema`.`events_waits_summary_by_user_by_event_name`
     `performance_schema`.`events_waits_summary_by_thread_by_event_name`
     `performance_schema`.`events_waits_summary_by_instance`
     `performance_schema`.`events_waits_summary_by_host_by_event_name`
     `performance_schema`.`events_waits_summary_by_account_by_event_name`
     `performance_schema`.`events_waits_history_long`
     `performance_schema`.`events_waits_history`
     `performance_schema`.`events_waits_current`
     `performance_schema`.`events_transactions_summary_global_by_event_name`
     `performance_schema`.`events_transactions_summary_by_user_by_event_name`
     `performance_schema`.`events_transactions_summary_by_thread_by_event_name`
     `performance_schema`.`events_transactions_summary_by_host_by_event_name`
     `performance_schema`.`events_transactions_summary_by_account_by_event_name`
     `performance_schema`.`events_transactions_history_long`
     `performance_schema`.`events_transactions_history`
     `performance_schema`.`events_transactions_current`
     `performance_schema`.`events_statements_summary_global_by_event_name`
     `performance_schema`.`events_statements_summary_by_user_by_event_name`
     `performance_schema`.`events_statements_summary_by_thread_by_event_name`
     `performance_schema`.`events_statements_summary_by_program`
     `performance_schema`.`events_statements_summary_by_host_by_event_name`
     `performance_schema`.`events_statements_summary_by_digest`
     `performance_schema`.`events_statements_summary_by_account_by_event_name`
     `performance_schema`.`events_statements_history_long`
     `performance_schema`.`events_statements_history`
     `performance_schema`.`events_statements_current`
     `performance_schema`.`events_stages_summary_global_by_event_name`
     `performance_schema`.`events_stages_summary_by_user_by_event_name`
     `performance_schema`.`events_stages_summary_by_thread_by_event_name`
     `performance_schema`.`events_stages_summary_by_host_by_event_name`
     `performance_schema`.`events_stages_summary_by_account_by_event_name`
     `performance_schema`.`events_stages_history_long`
     `performance_schema`.`events_stages_history`
     `performance_schema`.`events_stages_current`
     `performance_schema`.`cond_instances`
     `performance_schema`.`accounts`
     `mysql`.`slow_log`
     `mysql`.`general_log`

Find out all the tables over 16K.

 [root@zlm2 :: /data/mysql/mysql3308/data]
 #pt-find -h192.168.1. -P3308 -uzlm -pzlmzlm --tablesize +
 `mysql`.`columns_priv`
 `mysql`.`db`
 `mysql`.`engine_cost`
 `mysql`.`event`
 `mysql`.`func`
 `mysql`.`gtid_executed`
 `mysql`.`help_category`
 `mysql`.`help_keyword`
 `mysql`.`help_relation`
 `mysql`.`help_topic`
 `mysql`.`innodb_index_stats`
 `mysql`.`innodb_table_stats`
 `mysql`.`ndb_binlog_index`
 `mysql`.`plugin`
 `mysql`.`proc`
 `mysql`.`procs_priv`
 `mysql`.`proxies_priv`
 `mysql`.`server_cost`
 `mysql`.`servers`
 `mysql`.`slave_master_info`
 `mysql`.`slave_relay_log_info`
 `mysql`.`slave_worker_info`
 `mysql`.`tables_priv`
 `mysql`.`time_zone`
 `mysql`.`time_zone_leap_second`
 `mysql`.`time_zone_name`
 `mysql`.`time_zone_transition`
 `mysql`.`time_zone_transition_type`
 `mysql`.`user`
 `sys`.`sys_config`
 `zlm`.`t1`
 `zlm`.`t2`

Find out table in "zlm" database which name is like "t3" then drop it.

 (zlm@192.168.1.101 )[zlm]>create table t3 like t2;
 Query OK,  rows affected (0.02 sec)

 (zlm@192.168.1.101 )[zlm]>show create table t3\G
 *************************** . row ***************************
        Table: t3
 Create Table: CREATE TABLE `t3` (
   `id` int() NOT NULL,
   `name` char() DEFAULT NULL,
   PRIMARY KEY (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
  row in set (0.00 sec)

 (zlm@192.168.1.101 )[zlm]>show tables;
 +---------------+
 | Tables_in_zlm |
 +---------------+
 | t1            |
 | t2            |
 | t3            |
 +---------------+
  rows in set (0.00 sec)

 [root@zlm2 :: /data/mysql/mysql3308/data]
 #pt-find -h192.168.1. -P3308 -uzlm -pzlmzlm --print zlm --tbllike=t3 --exec-plus "drop table %s"
 `zlm`.`t3`

 (zlm@192.168.1.101 )[zlm]>show tables;
 +---------------+
 | Tables_in_zlm |
 +---------------+
 | t1            |
 | t2            |
 +---------------+
  rows in set (0.00 sec)

 //The table has been droped directly by the last command in pt-find.

Summary

• pt-find is rather useful when retrieving target table with flexible conditions you defined.
• pt-find has a lot of options.We should be more careful when using ddl statement by "--exec" or "--exec-plus".
• We can use it to collect the important information about a bunch of tables easily which can increse the working efficiency.