CREATE TABLE COLUMNS_hj as select * from information_schema.`COLUMNS`; INSERT INTO COLUMNS_hj SELECT * FROM COLUMNS_hj; -- 最后一次插入25万行 CREATE TABLE COLUMNS_hj2 as select * from information_schema.`COLUMNS`; explain format=tree SELECT COUNT(c1. PRIVILE
1>hset setname field value hset stuSet name zhangsan:1 2>hget setname field hget stuset name:nil hget stuSet name:zhangsan(说明redis是区分大小写的) 3>hsetnx setname field value 如果field存在,不做任何操作.如果没,则创建 hsetnx stuSet name lisi:0 hsetnx stuSet name
[20190415]关于shared latch(共享栓锁).txt http://andreynikolaev.wordpress.com/2010/11/17/shared-latch-behaves-like-enqueue/ For the shared latches Oracle 10g uses kslgetsl(laddr, wait, why, where, mode) function. Oracle 11g has kslgetsl_w()function with the