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Oracle Parallel Server Tables

Oracle Tips by Burleson Consulting

Real Application Clusters

This section covers the tables that relate to the use of Oracle Parallel Server (OPS), which has been renamed to Real Application Clusters (RAC) in Oracle9i. The first table, stats$rowcache_summary, contains information relating to each of the many instances in the OPS environment. For the benefit of those who have never used Oracle Parallel Server, an OPS environment allows you to define multiple instances that share the same database. Because there are multiple instances for each database, the Oracle Integrated Distributed Lock Manager (IDLM), is used to manage the transportation of data blocks between the buffers in many instances. This process of transferring data blocks between instances is called pinging.

The stats$rowcache_summary Table

The activity within the IDLM is the purpose of the stats$rowcache_summary table. The stats$rowcache_summary table tracks block usage within each one of the instances in the OPS environment.

When using STATSPACK with OPS, you must connect to the instance you wish
to collect data for and to run the report. If you are using statsauto.sql in an OPS environment, the statsauto.sql script must be run once on each instance in the cluster. Similarly, the job_queue_processes parameter must also be set for each OPS instance.

L 4-32

SQL> desc STATS$ROWCACHE_SUMMARY;
 Name                                      Null?    Type
 ----------------------------------------- -------- -------------------
 SNAP_ID                                   NOT NULL NUMBER(6)
 DBID                                      NOT NULL NUMBER
 INSTANCE_NUMBER                           NOT NULL NUMBER
 PARAMETER                                 NOT NULL VARCHAR2(32)
 TOTAL_USAGE                                        NUMBER
 USAGE                                              NUMBER
 GETS                                               NUMBER
 GETMISSES                                          NUMBER
 SCANS                                              NUMBER
 SCANMISSES                                         NUMBER
 SCANCOMPLETES                                      NUMBER
 MODIFICATIONS                                      NUMBER
 FLUSHES                                            NUMBER
 DLM_REQUESTS                                       NUMBER
 DLM_CONFLICTS                                      NUMBER
 DLM_RELEASES                                       NUMBER

The stats$sgaxs Table

The stats$sgaxs table is used to cross-reference the multiple SGAs that are used in a single OPS environment. In many OPS environments, the database administrator can dynamically change the number of instances that are referencing an individual database, such that the number of databases in an OPS set of instances at any given time may be different.

Note: This table will only exist if you have Oracle Parallel Server (OPS in Oracle8i) or Real Application Clusters (RAC in Oracle9i) installed.

L 4-33

SQL> desc STATS$SGAXS;
 Name                                      Null?    Type
 ----------------------------------------- -------- -------------------
 SNAP_ID                                   NOT NULL NUMBER(6)
 DBID                                      NOT NULL NUMBER
 INSTANCE_NUMBER                           NOT NULL NUMBER
 STARTUP_TIME                              NOT NULL DATE
 PARALLEL                                  NOT NULL VARCHAR2(3)
 NAME                                      NOT NULL VARCHAR2(64)
 VERSION                                            VARCHAR2(17)
 VALUE                                              NUMBER


This is an excerpt from "Oracle9i High Performance tuning with STATSPACK" by Oracle Press.


If you like Oracle tuning, you may enjoy the new book "Oracle Tuning: The Definitive Reference", over 900 pages of BC's favorite tuning tips & scripts. 

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