DBA SGA Blocking Session Summary

Description:

Summary of blocked and blocking sessions based on the active session history from the SGA. The link to blocking sessions is deliberately nonunique without jointing to sample_id to increase the chance to fetch the blocking session’s additional information such as module, action and client_id. In some cases, such as row lock scenarios, the blocking session is idle and does not show up in the ASH.

We recommend doing further analysis with a pivot in Excel rather than by SQL, as Excel’s drag- and drop is a lot faster than typing commands manually.

Parameters

User Name, Module Type, Module contains, From Time, To Time, Wait Event, SID - Serial#, SQL Id, UI Sessions only, Session Type, Instance Id, Schema, Action contains, Program contains, Diagnostic Pack enabled

Used tables

v$waitstat, dual, dba_objects, gv$sqlarea, obj$, gv$active_session_history, dba_users, y

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 Blocking Session Summary 21-Jan-2019 083708.xlsx

Report SQL

www.enginatics.com/reports/dba-sga-blocking-session-summary/

Blitz Report™ import options

DBA_SGA_Blocking_Session_Summary.xml

Case Study & Technical Analysis

Abstract

The DBA SGA Blocking Session Summary report aggregates data from the Active Session History (ASH) in the SGA to provide a retrospective view of locking and contention. While the standard ASH report shows all activity, this report filters and summarizes specifically for blocking scenarios, helping DBAs understand the impact and duration of lock chains that occurred recently.

Technical Analysis

Core Logic

Source: Queries GV$ACTIVE_SESSION_HISTORY where BLOCKING_SESSION is not null.
Aggregation: Groups by the blocking session’s attributes to show which session/user was the “root blocker” and how much time other sessions spent waiting behind them.
Wait Events: Typically focuses on enq: TX - row lock contention, library cache lock, or buffer busy waits.

Limitations of ASH for Locking

Sampling Bias: Short locks (< 1 second) might be missed by the 1-second sampler.
Idle Blockers: As noted in the ASH analysis, if the blocker is idle, it won’t be in ASH. This report is best for finding “active” blockers—e.g., a batch job that is running slow SQL and holding locks that block online users.

Key View

GV$ACTIVE_SESSION_HISTORY: The in-memory circular buffer of active session samples.

Operational Use Cases

Post-Mortem: Analyzing a “system hang” that cleared up before a DBA could look at it.
Pattern Recognition: Identifying if a specific scheduled job consistently blocks users at 2:00 PM every day.
Concurrency Tuning: Identifying “hot” records or tables that are subject to frequent contention.

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.

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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
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Capacity	Legal Entity Configurator
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OKS Service Contracts Billing History OKS Service Contracts Billing Schedule	AD Applied Patches AD Applied Patches 11i AD Applied Patches R12.2
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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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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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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