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Flash Usage Models for the Oracle Database


• Transparent disk replacement for databases
  – One for one replacement for conventional disks
  – Array caching layer
  – Auto-tiering storage layer
  Flash storage is transparent to the database and managed by the
    storage layer. The management of flash storage does not possess
    knowledge for how the database functions.
• Fast storage managed by the database kernel
  – Database Smart Flash Cache
  – Exadata Smart Flash Cache
  With respect to the management of flash storage, there is significant
    value of having internal knowledge of the database’s functionality.
Database Smart Flash Cache



                                                          Access Buffer Cache
                                                            -> Flash Cache



              SGA                                   SGA
  Hot Data                              Hot Data


        Warm Data                             Warm Data



                    If not enough space in
Cold Data            “Buffer Cache”, then
                     write “Clean Block” to               Cold Data
                         “Flash Cache”

                                                                                2
Exadata Smart Flash Cache

                               Exadata Database Machine


                                                  Storage Grid
                                                 • 14x 2-socket storage servers
                                                 • 100 TB high-speed disk, or
                                                   336 TB high-capacity disk
Database Grid Servers
                                                 • 5 TB PCI Flash
                                                     • Smart Flash Cache holds hot
                                                       data
 InfiniBand Internal Net
                                                     • Over 1.5 million IO/sec from
                                                       SQL (8K)
                                                     • Sub-millisecond response
                                                     • 75 GB/sec query throughput
1 or 10 Gb Ethernet to Data Center

   © 2011 Oracle Corporation
                                                                  3
Database Flash Usage Models

                         Physical Disks

                 FLASH


                 FLASH       Cache
                                          Storage
                         Logical Disks


                 FLASH




 Exadata Smart
                 FLASH
  Flash Cache

Database Smart
 Flash Cache     FLASH     Cache (SGA)
                                          Database

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Flash Usage Models for the Oracle Database

  • 1. Flash Usage Models for the Oracle Database • Transparent disk replacement for databases – One for one replacement for conventional disks – Array caching layer – Auto-tiering storage layer Flash storage is transparent to the database and managed by the storage layer. The management of flash storage does not possess knowledge for how the database functions. • Fast storage managed by the database kernel – Database Smart Flash Cache – Exadata Smart Flash Cache With respect to the management of flash storage, there is significant value of having internal knowledge of the database’s functionality.
  • 2. Database Smart Flash Cache Access Buffer Cache -> Flash Cache SGA SGA Hot Data Hot Data Warm Data Warm Data If not enough space in Cold Data “Buffer Cache”, then write “Clean Block” to Cold Data “Flash Cache” 2
  • 3. Exadata Smart Flash Cache Exadata Database Machine Storage Grid • 14x 2-socket storage servers • 100 TB high-speed disk, or 336 TB high-capacity disk Database Grid Servers • 5 TB PCI Flash • Smart Flash Cache holds hot data InfiniBand Internal Net • Over 1.5 million IO/sec from SQL (8K) • Sub-millisecond response • 75 GB/sec query throughput 1 or 10 Gb Ethernet to Data Center © 2011 Oracle Corporation 3
  • 4. Database Flash Usage Models Physical Disks FLASH FLASH Cache Storage Logical Disks FLASH Exadata Smart FLASH Flash Cache Database Smart Flash Cache FLASH Cache (SGA) Database