我要评论背景描述
# time: 2019-01-24t00:08:14.705724+08:00 # user@host: **[**] @ [**] id: ** # schema: sentrymeta last_errno: 0 killed: 0 # query_time: 0.315758 lock_time: 0.001693 rows_sent: 9664 rows_examined: 36413 rows_affected: 0 # bytes_sent: 1616970 tmp_tables: 1 tmp_disk_tables: 1 tmp_table_sizes: 16384 # qc_hit: no full_scan: no full_join: no tmp_table: yes tmp_table_on_disk: yes # filesort: no filesort_on_disk: no merge_passes: 0 # innodb_io_r_ops: 0 innodb_io_r_bytes: 0 innodb_io_r_wait: 0.000000 # innodb_rec_lock_wait: 0.000000 innodb_queue_wait: 0.000000 # innodb_pages_distinct: 1085
total used free shared buffers cached mem: 125 38 87 0 0 19 -/+ buffers/cache: 18 107 swap: 31 0 31
root@(none)04:33:02>select version(); +---------------+ | version() | +---------------+ | 5.7.19-17-log | +---------------+ 1 row in set (0.00 sec) root@(none)04:33:07>show variables like '%table_size%'; +---------------------+-----------+ | variable_name | value | +---------------------+-----------+ | max_heap_table_size | 134217728 | | tmp_table_size | 16777216 | +---------------------+-----------+ 2 rows in set (0.00 sec)
问题分析
q1：为什么会产生临时表？
这个不多说，sql写的惹不起，反正就是半个小时看不懂的那种，就是一眼就知道一定会产生临时表的
您可能感兴趣的文章:
如您对本文有疑问或者有任何想说的，请点击进行留言回复，万千网友为您解惑！
网友评论