Exadata 12.2.1.1.0 Highlights

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突然发现,在中国农历新年的这几年里,Exadata 12.2版本已经发布了。

本起去docs.oracle.com上看看它的新特性,结果发现文档还没有更新:

下面是找到的一些资料,让我们来一睹为快吧:

Smart Analytics:

(1). In-Memory Formats in Columnar Flash Cache

  • In-Memory formats used in Smart Columnar Flash Cache
  • Enables vector processing on storage server during smart scans
    • Multiple column values evaluated in single instruction
  • Faster decompression speed than Hybrid Columnar Compression
  • Enables dictionary lookup and avoids processing unnecessary rows
  • Smart Scan results sent back to database in In-Memory Columnar format
    • Reduces Database node CPU utilization
  • In-memory performance seamlessly extended from DB node DRAM memory to 10x larger capacity flash in storage
    • Even bigger differentiation against all-flash arrays and other in-memory databases
  • Supports Database 12.1.0.2 and Database 12.2.0.1

(2). Storage Index Set Membership

  • Storage Index help skip unnecessary ios
    • Currently contains up to 8 columns of min/max summary
    • Created automatically and kept in memory
  • What about queries with low cardinality columns?
  • Traditional min/max not good enough
  • Database gathers stats and find that column has less than 400 distinct values
  • Database requests storage to compute bloom filter
  • Storage will compute distinct values and create a bloom filter
  • Smart Scans check value \'CA\' against bloom filter and saves performing I/O
  • Supports Database 12.1.0.2 and Database 12.2.0.1

(3). Smart Write Bursts and Temp IO in Flash Cache

  • Write throughput of four flash cards has become greater than the write throughput of 12-disks
  • When database write throughput exceeds throughput of disks, Smart Flash Cache intelligently caches writes
  • When queries write a lot of temp IO, Smart Flash Cache intelligently caches temp IO
    • Writes to flash for temp spill reduces elapsed time
    • Reads from flash for temp reduces elapsed time further
  • Smart Flash Cache prioritizes OLTP data and does not remove hot OLTP lines from the cache
  • Smart flash wear management for large writes
  • Supports Database 11.2.0.4, 12.1.0.2 and 12.2.0.1

(4). More Enhancements

  • Storage Index will now store information about 24 columns instead of 8
    • Metadata space shared by set membership summary and min/max summary
    • Workload determines which summary gets stored
  • Columnar Flash Cache for encrypted tablespaces
    • Data stays encrypted in columnar flash cache
    • Works seamlessly with In-Memory Formats in Flash Cache
    • Benefits Exadata Cloud Service as all data is encrypted in Oracle Public Cloud
  • Supports Database 12.1.0.2 and Database 12.2.0.1
  • Smart Scan Offload for Compressed Index Scan
  • Smart Scan enhancements for XML
  • Enhancements to XMLExists, XMLCast and XMLQuery
  • Smart Scan offload enhancements for LOBs
  • Extended to "LENGTH, SUBSTR, INSTRM CONCAT, LPAD, RPAD, LTRIM, RTRIM, LOWER, UPPER, NLS_LOWER, NLS_UPPER, NVL, REPLACE, REGEXP_INSTR, TO_CHAR"

     

Smart Consolidation:

(1). Up To 4,000 Pluggable Databases

  • Exadata offers unique end-to-end resource management and consolidation capabilities
  • Multitenant Option now allows greater than 252 Pluggable Databases within a single Oracle Multitenant Container Database
    • Up to thousands
  • Exclusively available on Exadata and DB PaaS

(2). Additional Ethernet Connectivity

  • Additional Ethernet card offered for customers that require additional connectivity
    • Dual port 10GE copper connectivity (part number 7100488)…OR
    • Dual port 10GE optical connectivity (part number X1109A-Z)
  • Installed in PCIe slot 1 on the Oracle Exadata X6-2 database server
  • Exadata SW automatically recognizes the new card and configures the two ports as eth6 and eth7 interfaces on the database server
  • Additional ports can be used for any purpose

 

Smart OLTP:

(1). End-to-End IO Latency Capping

  • Exadata Storage Server software detects and automatically eliminates IO latency outliers on disk and flash media
  • On very rare occasions network outliers can deteriorate latency between database and storage servers
  • Database 12.2 automatically redirects slow read I/O operations to another Exadata storage server
  • Ensures end-to-end low latency for OLTP read I/Os

(2). Extended Distance Clusters

  • Data Mirroring between two nearby sites
  • InfiniBand connected for high performance
    • Limited to 100m optical cables in 2016 (best for fire cells)
  • Implemented using 12.2 ASM Extended Diskgroups
    • Nested failure groups
  • Compute nodes at each site read data local to that site
  • Data is written to all sites
  • Smart Scans scan across cells on both sites increasing throughput
    • Row filtering, column projection, storage index, and flash cache provide extreme performance
  • Data Guard continues to be the recommended DR solution

(3). New Redo Log Write Metrics

  • Redo Log Write response times are very critical to large scale OLTP systems
  • New metrics to measure
    • Overall IO latency
    • Networking and other overhead
    • IOs serviced by Flash Log
    • Overall latency per storage server
  • Improves visibility of redo log write performance

 

Smart Manageability:

(1). Super Fast and Robust Software Updates

  • Oracle Public Cloud is the largest Exadata deployment with hundreds of Exadata Database Machine deployed
    • Each software release goes through thousands of upgrade cycles
    • All upgrade utilities get exercised thousands of times as well
    • Contributes to the robustness of the software release and utilities
  • 5x speed up in Storage Server Software Update
    • Parallel firmware upgrades across components such as hard disks, flash, ILOM/BIOS, InfiniBand card
    • Reduced reboots for Software updates, use kexec where possible
    • Manage a Cloud instead of managing a single rack
    • Use single patchmgr utility to upgrade hundreds of racks
  • Enable patchmgr to run from a non-Exadata system and run as low privileged user

(2). Miscellaneous Enhancements

  • Storage Server Rescue Plan
    • Create a per server repository of customizations such as IORM plans, thresholds, etc.
    • Invoke the rescue plan upon restoration
  • Make DNS, NTP, and other IP address changes online
  • Storage server to storage server offload support for ASM Scoped-Security
    • Enable keys, called cell keys, on storage servers to authenticate offload operation
    • Applies to ASM resync, rebalance, resilver, rebuild and database high throughput write operations
  • Quarantine Manager support for high throughput write
    • Automatically detects and quarantines any anomalous operation and uses alternate IO path
  • IPv6 + Virtual machine + VLAN deployments
  • Get graphs from Exawatcher
  • Seamless customer service with Automatic Service Requests sending diagnostic attachments
  • Oracle installer support for Quorum Disks in Database 12.2.0.1
  • Manage Compute nodes using a RESTful service
    • ExaCli enabled for compute nodes in addition to storage cells

 

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