- HDFS is a spread across multiple machines (Simple with commodity Hardware)
- Nothing unique about individual machine but unique part is a cluster as a whole is highly fault tolerant
- Well Suited for large Batch Jobs
- Not a low latency system
- Data is HDFS is very very large (Semi-Structured)
- Any data in HDFS in split across multiple disks where each disk in present on a diff machine in a cluster
- File system manage machine and space
- Setup by Master-Salve Nodes
- Master Node (Name Node) coordinates with Slave Nodes(Data Node)
- One Namenode/Cluster
- For Example - Name note is like a table of content of a book and data node are the actual chapters
- NameNode has 2 responsibilities
- Manage the overall file system
- Stores (Directory Structure)
- Other File metadata
- DataNode
- Physically stores the data
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Core aggregate functions like SUM, COUNT, MAX, MIN
Ranking functions like ROWNUM, RANK, NTILE String functions like SUBSTR, REPLACE,INSTR Data conversion functions like CAST, CONVERT Find Current database location
SELECT name, physical_name AS current_file_location FROM sys.master_files |
Join DFIR Global Slack ChannelMac Forensics
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