RECORD LOCKS space id 45 page no 5 n bits 72 index `uniq_c1` of table `test`.`tu` trx id 146751 lock_mode X locks rec but not gap RECORD LOCKS space id 45 page no 3 n bits 80 index `PRIMARY` of table `test`.`tu`
Method 1: Deleting a Single Row in SQL The DELETE statement in SQL uses the WHERE clause to specifically delete a record from the table. Example: CREATE TABLE customers (customer_id INT PRIMARY KEY,name VARCHAR(50),city VARCHAR(50),email VARCHAR(100));INSERT INTO customers (customer_id, ...
Notice the WHERE clause in the DELETE statement. The WHERE clause specifies which record(s) should be deleted. If you omit the WHERE clause, all records in the table will be deleted!It is possible to delete all rows in a table without deleting the table. This means that the table ...
DELETEFROMusersWHEREuser_idNOTIN(SELECTuser_idFROMorders); 1. 2.3 限制删除条目数量 大规模删除数据时,直接执行大规模的DELETE可能会导致性能问题或甚至引起数据库锁的问题,建议采取分批删除的方式: SET@done=0;WHILE@done=0DODELETEFROMusersWHEREage>30LIMIT1000;SET@done=ROW_COUNT();ENDWHILE; 1. 2. 3....
Start of record:上一条redo日志结束, 本条开始在页面中的地址。 注意:undo on在一个事务里从0开始递增,只要事务没有提交,后面的undo on都会+1。 如果记录中主键只包含一个列,那么在该类型trx_undo_insert_rec和undo日志中只需要吧该列占用的存储空间大小和真实值记录下来,如果记录中包含多个列,那么每列真实值...
Record lock, heap no 52 PHYSICAL RECORD: n_fields 57; compact format; info bits 0 事务2 中的session_endpoint表在执行insert操作的时候被阻塞了,而且这条插入SQL在等待插入意向锁(lock_mode X locks gap before rec insert intention waiting)
显然测试案例一中 sess2 持有记录(6,6)的lock X record lock but not gap,会阻塞 insert (3,3)申请LOCK S Next key lock . 2.4 测试用例 2.5 死锁日志 ***(1) TRANSACTION: TRANSACTION 2489, ACTIVE 43 sec inserting mysql tables inuse1, locked 1 ...
RECORD LOCKS space id 9016 page no 59 n bits 368 index PRIMARY of table `alice_user_04`.`UserExpirationItem_p04` trx id 13096962 lock_mode X locks rec but not gap waiting 说明: 1) 从php错误日志和mysql查询到的数据都说明是执行一个delete from UserExpirationItem_p04 where id in(…)的语句...
#下面再来看看控制文件 SQL> select * from gv$controlfile_record_section where type='ARCHIVED LOG'; INST_ID TYPE RECORD_SIZE RECORDS_TOTAL RECORDS_USED FIRST_INDEX LAST_INDEX LAST_RECID --- --- --- --- --- --- --- --- 1 ARCHIVED LOG 584 224 224 149 148 456 2 ARCHIVED LOG 584...
mysql-py> db.city.delete().where("Name = 'Olympia'")Delete the First Record To delete the first record in the city table, use the limit() method with a value of 1. mysql-py> db.city.delete().limit(1)Delete All Records in a Table You can delete all records in a table. To...