In conjunction with Cluster Health Monitor (CHM), QoS Management's memory guard detects nodes that are at risk of failure due to the over commitment of memory. QoS Management then presents them in an integrated Enterprise Manager dashboard to review real-time performance of consolidated applications. Using a policy-based architecture, QoS Management correlates accurate run-time performance and resource metrics based on user-defined workload classes. Oracle Database Quality of Service (QoS) Management allows system administrators to directly measure application service levels hosted on Oracle RAC Enterprise Edition databases. This provides the storage benefits of Oracle's Hybrid Columnar Compression, which had previously been exclusive to the Oracle Exadata platform, to Oracle Database users who use Pillar Axiom or Sun ZFSSA storage (or both), enabling compression ratios of 10x to 50x, depending on the data and the compression level chosen by the user.ΔΆ.1.5 QoS Management Support for Oracle RAC Enterprise Edition The support of Hybrid Columnar Compression on Pillar and ZFSSA enables Oracle Database users to utilize Oracle's Hybrid Columnar Compression on Pillar Axiom and Sun ZFS Storage Appliance (ZFSSA) storage hardware. This feature extends Hybrid Columnar Compression to Pillar Axiom and Sun ZFS Storage Appliance (ZFSSA) storage. Storing column data together, with the same data type and similar characteristics, dramatically increases the storage savings achieved from compression. After the column data for a set of rows has been compressed, it is fit into the compression unit. When data is loaded, groups of rows are stored in columnar format, with the values for a given column stored and compressed together. A logical construct called the compression unit is used to store a set of HCC-compressed rows. HCC utilizes a combination of both row and columnar methods for storing data. Oracle's Hybrid Columnar Compression (HCC) technology is a new (to Oracle Database 11 g Release 2) method for organizing data within a database block. 2.1.1 Support Hybrid Columnar Compression on Pillar Axiom and Sun ZFSSA
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