Mysql学习mysql show processlist 显示mysql查询进程

MYSQL必读mysql 查看当前连接数

MYSQL必读命令： show processlist; 
如果是root帐号,你能看到所有用户的当前连接.如果是其它普通帐号,只能看到自己占用的连接. 
show processlist;只列出前100条,如果想全列出请使用show full processlist; 
mysql> show processlist;

MYSQL必读命令： show status;

MYSQL必读Aborted_clients 由于客户没有正确关闭连接已经死掉,已经放弃的连接数量. 
Aborted_connects 尝试已经失败的MySQL服务器的连接的次数. 
Connections 试图连接MySQL服务器的次数. 
Created_tmp_tables 当执行语句时,已经被创造了的隐含临时表的数量. 
Delayed_insert_threads 正在使用的延迟插入处理器线程的数量. 
Delayed_writes 用INSERT DELAYED写入的行数. 
Delayed_errors 用INSERT DELAYED写入的发生某些错误(可能重复键值)的行数. 
Flush_commands 执行FLUSH命令的次数. 
Handler_delete 请求从一张表中删除行的次数. 
Handler_read_first 请求读入表中第一行的次数. 
Handler_read_key 请求数字基于键读行. 
Handler_read_next 请求读入基于一个键的一行的次数. 
Handler_read_rnd 请求读入基于一个固定位置的一行的次数. 
Handler_update 请求更新表中一行的次数. 
Handler_write 请求向表中插入一行的次数. 
Key_blocks_used 用于关键字缓存的块的数量. 
Key_read_requests 请求从缓存读入一个键值的次数. 
Key_reads 从磁盘物理读入一个键值的次数. 
Key_write_requests 请求将一个关键字块写入缓存次数. 
Key_writes 将一个键值块物理写入磁盘的次数. 
Max_used_connections 同时使用的连接的最大数目. 
Not_flushed_key_blocks 在键缓存中已经改变但是还没被清空到磁盘上的键块. 
Not_flushed_delayed_rows 在INSERT DELAY队列中等待写入的行的数量. 
Open_tables 打开表的数量. 
Open_files 打开文件的数量. 
Open_streams 打开流的数量(主要用于日志记载) 
Opened_tables 已经打开的表的数量. 
Questions 发往服务器的查询的数量. 
Slow_queries 要花超过long_query_time时间的查询数量. 
Threads_connected 当前打开的连接的数量. 
Threads_running 不在睡眠的线程数量. 
Uptime 服务器工作了多少秒.

MYSQL必读After create

MYSQL必读This occurs when the thread creates a table (including internal temporary tables), at the end of the function that creates the table. This state is used even if the table could not be created due to some error.

MYSQL必读Analyzing

MYSQL必读The thread is calculating a MyISAM table key distributions (for example, for ANALYZE TABLE).

MYSQL必读checking permissions

MYSQL必读The thread is checking whether the server has the required privileges to execute the statement.

MYSQL必读Checking table

MYSQL必读The thread is performing a table check operation.

MYSQL必读cleaning up

MYSQL必读The thread has processed one command and is preparing to free memory and reset certain state variables.

MYSQL必读closing tables

MYSQL必读The thread is flushing the changed table data to disk and closing the used tables. This should be a fast operation. If not, you should verify that you do not have a full disk and that the disk is not in very heavy use.

MYSQL必读converting HEAP to MyISAM

MYSQL必读The thread is converting an internal temporary table from a MEMORY table to an on-disk MyISAM table.

MYSQL必读copy to tmp table

MYSQL必读The thread is processing an ALTER TABLE statement. This state occurs after the table with the new structure has been created but before rows are copied into it.

MYSQL必读Copying to group table

MYSQL必读If a statement has different ORDER BY and GROUP BY criteria, the rows are sorted by group and copied to a temporary table.

MYSQL必读Copying to tmp table

MYSQL必读The server is copying to a temporary table in memory.

MYSQL必读Copying to tmp table on disk

MYSQL必读The server is copying to a temporary table on disk. The temporary result set was larger than tmp_table_size and the thread is changing the temporary table from in-memory to disk-based format to save memory.

MYSQL必读Creating index

MYSQL必读The thread is processing ALTER TABLE ... ENABLE KEYS for a MyISAM table.

MYSQL必读Creating sort index

MYSQL必读The thread is processing a SELECT that is resolved using an internal temporary table.

MYSQL必读creating table

MYSQL必读The thread is creating a table. This includes creation of temporary tables.

MYSQL必读Creating tmp table

MYSQL必读The thread is creating a temporary table in memory or on disk. If the table is created in memory but later is converted to an on-disk table, the state during that operation will be Copying to tmp table on disk.

MYSQL必读deleting from main table

MYSQL必读The server is executing the first part of a multiple-table delete. It is deleting only from the first table, and saving columns and offsets to be used for deleting from the other (reference) tables.

MYSQL必读deleting from reference tables

MYSQL必读The server is executing the second part of a multiple-table delete and deleting the matched rows from the other tables.

MYSQL必读discard_or_import_tablespace

MYSQL必读The thread is processing an ALTER TABLE ... DISCARD TABLESPACE or ALTER TABLE ... IMPORT TABLESPACE statement.

MYSQL必读end

MYSQL必读This occurs at the end but before the cleanup of ALTER TABLE, CREATE VIEW, DELETE, INSERT, SELECT, or UPDATE statements.

MYSQL必读executing

MYSQL必读The thread has begun executing a statement.

MYSQL必读Execution of init_command

MYSQL必读The thread is executing statements in the value of the init_command system variable.

MYSQL必读freeing items

MYSQL必读The thread has executed a command. This state is usually followed by cleaning up.

MYSQL必读Flushing tables

MYSQL必读The thread is executing FLUSH TABLES and is waiting for all threads to close their tables.

MYSQL必读FULLTEXT initialization

MYSQL必读The server is preparing to perform a natural-language full-text search.

MYSQL必读init

MYSQL必读This occurs before the initialization of ALTER TABLE, DELETE, INSERT, SELECT, or UPDATE statements.

MYSQL必读Killed

MYSQL必读Someone has sent a KILL statement to the thread and it should abort next time it checks the kill flag. The flag is checked in each major loop in MySQL, but in some cases it might still take a short time for the thread to die. If the thread is locked by some other thread, the kill takes effect as soon as the other thread releases its lock.

MYSQL必读Locked

MYSQL必读The query is locked by another query.

MYSQL必读logging slow query

MYSQL必读The thread is writing a statement to the slow-query log.

MYSQL必读NULL

MYSQL必读This state is used for the SHOW PROCESSLIST state.

MYSQL必读login

MYSQL必读The initial state for a connection thread until the client has been authenticated successfully.

MYSQL必读Opening tables, Opening table

MYSQL必读The thread is trying to open a table. This is should be very fast procedure, unless something prevents opening. For example, an ALTER TABLE or a LOCK TABLE statement can prevent opening a table until the statement is finished.

MYSQL必读preparing

MYSQL必读This state occurs during query optimization.

MYSQL必读Purging old relay logs

MYSQL必读The thread is removing unneeded relay log files.

MYSQL必读query end

MYSQL必读This state occurs after processing a query but before the freeing items state.

MYSQL必读Reading from net

MYSQL必读The server is reading a packet from the network.

MYSQL必读Removing duplicates

MYSQL必读The query was using SELECT DISTINCT in such a way that MySQL could not optimize away the distinct operation at an early stage. Because of this, MySQL requires an extra stage to remove all duplicated rows before sending the result to the client.

MYSQL必读removing tmp table

MYSQL必读The thread is removing an internal temporary table after processing a SELECT statement. This state is not used if no temporary table was created.

MYSQL必读rename

MYSQL必读The thread is renaming a table.

MYSQL必读rename result table

MYSQL必读The thread is processing an ALTER TABLE statement, has created the new table, and is renaming it to replace the original table.

MYSQL必读Reopen tables

MYSQL必读The thread got a lock for the table, but noticed after getting the lock that the underlying table structure changed. It has freed the lock, closed the table, and is trying to reopen it.

MYSQL必读Repair by sorting

MYSQL必读The repair code is using a sort to create indexes.

MYSQL必读Repair done

MYSQL必读The thread has completed a multi-threaded repair for a MyISAM table.

MYSQL必读Repair with keycache

MYSQL必读The repair code is using creating keys one by one through the key cache. This is much slower than Repair by sorting.

MYSQL必读Rolling back

MYSQL必读The thread is rolling back a transaction.

MYSQL必读Saving state

MYSQL必读For MyISAM table operations such as repair or analysis, the thread is saving the new table state to the .MYI file header. State includes information such as number of rows, the AUTO_INCREMENT counter, and key distributions.

MYSQL必读Searching rows for update

MYSQL必读The thread is doing a first phase to find all matching rows before updating them. This has to be done if the UPDATE is changing the index that is used to find the involved rows.

MYSQL必读Sending data

MYSQL必读The thread is processing rows for a SELECT statement and also is sending data to the client.

MYSQL必读setup

MYSQL必读The thread is beginning an ALTER TABLE operation.

MYSQL必读Sorting for group

MYSQL必读The thread is doing a sort to satisfy a GROUP BY.

MYSQL必读Sorting for order

MYSQL必读The thread is doing a sort to satisfy a ORDER BY.

MYSQL必读Sorting index

MYSQL必读The thread is sorting index pages for more efficient access during a MyISAM table optimization operation.

MYSQL必读Sorting result

MYSQL必读For a SELECT statement, this is similar to Creating sort index, but for nontemporary tables.

MYSQL必读statistics

MYSQL必读The server is calculating statistics to develop a query execution plan.

MYSQL必读System lock

MYSQL必读The thread is going to request or is waiting for an internal or external system lock for the table. If this state is being caused by requests for external locks and you are not using multiple mysqld servers that are accessing the same tables, you can disable external system locks with the --skip-external-locking option. However, external locking is disabled by default, so it is likely that this option will have no effect. For SHOW PROFILE, this state means the thread is requesting the lock (not waiting for it).

MYSQL必读Table lock

MYSQL必读The next thread state after System lock. The thread has acquired an external lock and is going to request an internal table lock.

MYSQL必读Updating

MYSQL必读The thread is searching for rows to update and is updating them.

MYSQL必读updating main table

MYSQL必读The server is executing the first part of a multiple-table update. It is updating only the first table, and saving columns and offsets to be used for updating the other (reference) tables.

MYSQL必读updating reference tables

MYSQL必读The server is executing the second part of a multiple-table update and updating the matched rows from the other tables.

MYSQL必读User lock

MYSQL必读The thread is going to request or is waiting for an advisory lock requested with a GET_LOCK() call. For SHOW PROFILE, this state means the thread is requesting the lock (not waiting for it).

MYSQL必读Waiting for tables, Waiting for table

MYSQL必读The thread got a notification that the underlying structure for a table has changed and it needs to reopen the table to get the new structure. However, to reopen the table, it must wait until all other threads have closed the table in question.

MYSQL必读This notification takes place if another thread has used FLUSH TABLES or one of the following statements on the table in question: FLUSH TABLES tbl_name, ALTER TABLE, RENAME TABLE, REPAIR TABLE, ANALYZE TABLE, or OPTIMIZE TABLE.

MYSQL必读Waiting on cond

MYSQL必读A generic state in which the thread is waiting for a condition to become true. No specific state information is available.

MYSQL必读Writing to net

MYSQL必读The server is writing a packet to the network.

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