DBA SGA Buffer Cache Object Usage

Description:

SGA buffer cache space usage by object names (in MB). ‘Object Percentage’ shows how much of one particular object is currently stored in the buffer cache. 100% means that the object is completely in the buffer cache.

Current SGA memory usage is also listed in views: select * from v$sga select * from v$sgainfo select * from v$sga_dynamic_components

Arup Nanda gives a good explanation on how the buffer cache works: http://arup.blogspot.ch/2014/11/cache-buffer-chains-demystified.html

Parameters

Show Block Status

Used tables

gv$bh

Dependencies

If you would like to try one of these Oracle EBS SQLs without having Blitz Report installed, note that some of the reports require functions from utility package xxen_util.

Example Report

DBA SGA Buffer Cache Object Usage 05-Apr-2020 014325.xlsx

Report SQL

www.enginatics.com/reports/dba-sga-buffer-cache-object-usage/

Blitz Report™ import options

DBA_SGA_Buffer_Cache_Object_Usage.xml

Case Study & Technical Analysis

Abstract

The DBA SGA Buffer Cache Object Usage report provides a detailed breakdown of how the Database Buffer Cache memory is being utilized. It identifies which database objects (tables, indexes, clusters) are currently resident in RAM. This insight is critical for verifying that the most frequently accessed data is being cached effectively and for identifying “cache pollution” where large, infrequently used segments are washing out critical data.

Technical Analysis

Core Metrics

Size (MB): The amount of buffer cache memory occupied by a specific object.
Object Percentage: The percentage of the object’s total size that is currently cached. A value of 100% means the entire table/index is in memory.
Block Status: (Optional) Can differentiate between xcur (exclusive current), scur (shared current), and cr (consistent read) blocks, which is useful for RAC cache fusion analysis.

Key View

GV$BH: The Buffer Header view. This is a high-volume view that lists every single block currently in the buffer cache. Querying this on a busy, large-SGA system can be expensive, so use with caution.

Operational Use Cases

Sizing Verification: Determining if DB_CACHE_SIZE is adequate for the working set.
Pinning Candidates: Identifying small, hot tables that are frequently re-read and might benefit from being pinned (though less common in modern Oracle versions).
Performance Tuning: Detecting if a full table scan on a massive log table has flushed useful indexes out of the cache.
RAC Analysis: Understanding block distribution across instances in a cluster.

Oracle E-Business Suite Reporting Library

We provide an open source Oracle EBS SQLs as a part of operational and project implementation support toolkits for rapid Excel reports generation.

Blitz Report™ is based on Oracle EBS forms technology, and hence requires minimal training. There are no data or performance limitations since the output files are created directly from the database without going through intermediate file formats such as XML.

Blitz Report can be used as BI Publisher and Oracle Discoverer replacement tool. Standard Oracle BI Publisher and Discoverer reports can also be imported into Blitz Report for immediate output to Excel. Typically, reports can be created and version tracked within hours instead of days. The concurrent request output automatically opens upon completion without the need for re-formatting.

The Filters, Columns, Rows and Values fields are used to create and deliver the data in pivot table format with full drill down to details.

Blitz Report Pivots

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Blitz Report Dashboard

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The installation and implementation process usually takes less than 1 hour; you can refer to our installation and user guides for specific details.

If you would like to optimize your Oracle EBS implementation and or operational reporting you can visit www.enginatics.com to review great ideas and example usage in blog. Or why not try for yourself in our demo environment.

Alert	CRM Foundation
ALR Alerts	JTF Grid Datasources
Contracts Core	Lease and Finance Management
OKC Contract Lines Summary	OKL Termination Quotes
Payments	Process Manufacturing Inventory
IBY Payment Process Request Details	GMI Cycle Count Forms
Public Sector Financials	Shipping Execution
PSA Budgetary Control Transactions	WSH Shipping/Delivery Transactions
Warehouse Management	XML Publisher
WMS Control Board Tasks	XDO Publisher Data Definitions
Capacity	Legal Entity Configurator
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Service Contracts	Applications DBA
OKS Service Contracts Billing History OKS Service Contracts Billing Schedule	AD Applied Patches AD Applied Patches 11i AD Applied Patches R12.2
Enterprise Asset Management	Installed Base
EAM Assets EAM Weekly Schedule EAM Work Orders	CSI Customer Products Summary CSI Installed Base Extended Attributes Summary CSI Installed Base Summary by Organization
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PAY Costing Detail PAY Employee Payroll History PAY Payroll Element Details	OPM Batch Lot Cost Details OPM Batch Lot Cost Trends OPM Reconcilation
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XLA Distribution Links Summary XLA Entity ID Mappings XLA Subledger Period Close Exceptions	WF Activity Status Summary WF Business Events and Subscriptions WF Notifications
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Property Manager	Advanced Supply Chain Planning
PN GL Reconciliation PN Generate Lease Analysis PN Generate Lease Details PN Generate Portfolio Detail PN Generate Portfolio Summary	MSC Exceptions MSC Horizontal Plan MSC Pegging Hierarchy MSC Pegging Hierarchy 11i MSC Plan Orders MSC Vertical Plan
E-Business Tax	Projects
ZX Financial Tax Register ZX Lines Summary ZX Party Tax Profiles ZX Tax Accounts ZX Tax Regimes ZX US Sales Tax	PA Capital Project Summary with Asset Detail PA Project Budget PA Revenue, Cost, Budgets by Resources PA Revenue, Cost, Budgets by Work Breakdown Structure PA Task Schedule PA Transaction Sources
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Order Management	Work in Process
ONT Cancelled Orders ONT Order Holds ONT Orders ONT Orders and Lines ONT Recurring Billing Plan ONT System Parameters ONT Transaction Types Listing ONT Transaction Types and Line WF Processes	WIP Account Distribution WIP Discrete Job Shortage WIP Entities WIP Entities Summary WIP Outside Processing WIP Required Components WIP Value WIP Value Summary
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CE Bank Account Balances CE Bank Branches CE Bank Statement Import Execution CE Bank Statement and Reconciliation CE Bank Transaction Codes Listing CE Cash in Transit CE Cleared Transactions CE General Ledger Cash Account Usage CE General Ledger Reconciliation CE Transactions Available for Reconciliation	CST AP and PO Accrual Reconciliation CST COGS Revenue Matching CST Cost Groups CST Detailed Item Cost CST Inventory Value - Multi-Organization (Element Costs) 11i CST Inventory Value - Multi-Organization (Item Costs) CST Inventory Value Report - by Subinventory (Item Cost) CST Item Cost Reports CST Miscellaneous Accrual Reconciliation CST Period Close Subinventory Value CST Period Close Subinventory Value Summary CST Periodic Inventory Value CST Supply Chain Indented Bills of Material Cost CST Uninvoiced Receipts
Purchasing	Discoverer
PO Approval Assignments PO Approval Groups PO Approved Supplier List PO Cancelled Purchase Orders PO Cancelled Requisitions PO Document Types PO Headers PO Headers 11i PO Headers and Lines PO Headers and Lines 11i PO Internal Requisitions and Sales Orders PO Internal Requisitions/Deliveries Discrepancy PO Invoice Price Variance PO Purchase Price Variance PO Purchase Requisitions with PO Details	DIS Access Privileges DIS Business Areas DIS Discoverer and Blitz Report Users DIS End User Layers DIS Folders, Business Areas, Items and LOVs DIS Import Performance DIS Items, Folders and Formulas DIS Migration identify missing EulConditions DIS Users DIS Workbook Export Script DIS Workbook Import Validation DIS Workbook Owner Export Script DIS Workbooks, Folders, Items and LOVs DIS Worksheet Execution History DIS Worksheet Execution Summary DIS Worksheet SQLs
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FA Additions By Source FA Asset Additions FA Asset Book Details FA Asset Book Details 11i FA Asset Cost FA Asset Impairments FA Asset Inventory FA Asset Inventory Report FA Asset Reclassification FA Asset Register FA Asset Retirements FA Asset Summary (Germany) FA CIP Cost FA Cost Adjustments FA Depreciation Projection FA Depreciation Reserve FA Journal Entry Reserve Ledger FA Revaluation Reserve FA Tax Reserve Ledger	AP 1099 Payments AP Accounted Invoice Aging AP Cash Requirement AP DPIVA Export LSNA AP Expenses AP Final Payment Register 11i AP Intercompany Invoice Details AP Invoice Approval Status AP Invoice Audit Listing AP Invoice Payments AP Invoice Payments 11i AP Invoice on Hold AP Invoice on Hold 11i AP Invoices and Lines AP Invoices and Lines 11i AP Invoices with PO, Intercompany and SLA Details AP Matched and Modified Receipts AP Negative Supplier Balance AP Open Balances Revaluation AP Open Items Revaluation AP Posted Invoice Register AP Posted Payment Register AP Preliminary Payment Register 11i AP Supplier Statement AP Suppliers AP Suppliers 11i AP Suppliers Revenue Summary AP Suppliers Revenue Summary 11i AP Trial Balance AP Trial Balance Report Definitions
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Application Object Library	Database Administration
FND Application Context File FND Applications FND Attached Documents FND Attachment Functions FND Audit Setup FND Audit Table Changes by Column FND Audit Table Changes by Record FND Concurrent Managers FND Concurrent Program Incompatibilities FND Concurrent Programs and Executables FND Concurrent Programs and Executables 11i FND Concurrent Request Conflicts FND Concurrent Requests FND Concurrent Requests 11i FND Concurrent Requests Summary FND Data Groups FND Descriptive Flexfield Table Columns FND Descriptive Flexfields FND Document Categories FND Document Sequence Assignments FND Document Sequences FND FNDLOAD Object Transfer FND Flex Hierarchies (Rollup Groups) FND Flex Value Hierarchy FND Flex Value Security Rules FND Flex Value Sets, Usages and Values FND Flex Values FND Form Functions FND Forms Personalizations FND Help Documents and Targets FND Histogram Columns FND Key Flexfields FND Languages FND Lobs FND Log Messages FND Lookup Search FND Lookup Values FND Lookup Values Comparison between environments FND Menu Entries FND Messages FND Nodes FND Profile Option Values FND Profile Options FND Request Groups FND Responsibilities FND Responsibility Access FND Responsibility Access 11i FND Responsibility Menu Exclusions FND Role Hierarchy FND Roles FND Rollup Groups FND SOA Runtime Error FND Tables and Columns FND User Login History FND User Login Page Favorites FND User Login Summary FND User Responsibilities FND User Roles FND User Roles 11i FND Users	DBA AWR Active Session History DBA AWR Blocking Session Summary DBA AWR CPU Load (active session history) DBA AWR CPU vs Wait Time Summary DBA AWR Interconnect Traffic DBA AWR Latch Summary DBA AWR Latch by Time DBA AWR PGA History DBA AWR SQL Execution Plan History DBA AWR SQL Performance Summary DBA AWR Settings DBA AWR System Metrics Summary DBA AWR System Time Percentages DBA AWR System Time Summary DBA AWR Tablespace Usage DBA AWR Wait Class by Time DBA AWR Wait Event Summary DBA AWR Wait Event Summary (active session history) DBA Alert Log DBA Archive / Redo Log Rate DBA Automated Maintenance Tasks DBA Blocking Sessions DBA CPU Benchmark1 DBA CPU Benchmark2 DBA CPU Benchmark3 DBA Dependencies (used by) DBA Dependencies (uses) DBA Editioned Object Summary DBA Editions DBA External Table Creation DBA Feature Usage Statistics DBA Hierarchical Profiler Data DBA Index Columns DBA Jobs DBA Log Switches DBA Objects DBA Parameters DBA Profiler Data DBA Redo Log Files DBA Registry SQL Patch DBA Result Cache Objects and Dependencies DBA Result Cache Statistics DBA SGA Active Session History DBA SGA Blocking Session Summary DBA SGA Buffer Cache Object Usage DBA SGA CPU Load (active session history) DBA SGA Memory Allocation DBA SGA SQL Execution Plan History DBA SGA SQL Performance Summary DBA SGA Target Advice DBA SGA Wait Event Summary (active session history) DBA SGA+PGA Memory Configuration DBA Scheduler Jobs DBA Segments DBA Session Longops DBA Table Columns DBA Table Modifications DBA Tablespace Usage DBA Text Search DBA Trace File Contents