Sometimes it is necessary to write some timed task scripts, a brief summary, memos.
>>> import datetime
>>> datetime.datetime.now()
datetime.datetime(2018, 5, 23, 17, 16, 33, 61000)
>>> print
Tag: small knot
ZK small knot
One ZooKeeper function 1. File system
2. Notification mechanism
Each sub-directory item is called a znode. Like the file system, we can add and delete znodes freely. Add or delete sub-z
Hive small knot
(1) Basic introduction to hive
Hive is a data warehouse tool based on Hadoop, which can map structured data files to a database table and provide SQL-like query functions
Other knowledg
PowerDesigner use method summary
PowerDesigner is mostly used for database model design and has functions such as automatic generation of SQL statements. Of course, there are also many shortcomings, such as team sharing.
1.