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Tools and Tips for Oracle Performance and SQL Tuning

Archive for the ‘Active Session History’ Category

Meet: eAdam – Enkitec’s free AWR data mining tool

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You recently learned about eDB360, and now eAdam? What is this eAdam tool? Before you continue reading, please be aware that eAdam reads data from AWR, thus you must have a license for the Oracle Diagnostics Pack in order to use this new eAdam tool.

Introduction

New eAdam is a free tool to perform data mining on performance related historical data recorded by AWR. The main characteristics of eAdam are:

  • Installs nothing on the Source database (usually Production)
  • Extracts AWR performance related data as plain text flat files (no export or data pump binary files)
  • Upload extracted AWR data into a Staging database of same or different platform and release
  • Data mining is performed on the Staging database instead of Production

How does eAdam work?

It is better to explain eAdam by functions. So I would say eAdam has the following 4 modules:

  1. AWR extraction from Source (Production)
  2. eAdam installation on Staging system
  3. Loading into eAdam Stage a set of AWR  files extracted from Source
  4. AWR data mining on eAdam Stage

AWR extraction from Source (Production)

This is the simplest part. You just need to execute a simple and short script on a Source system (usually Production). This script extracts into flat files the content of the following AWR views. Then it compresses them into a TAR file. List below may expand over time as new eAdam versions become available.

DBA_HIST_ACTIVE_SESS_HISTORY
DBA_HIST_DATABASE_INSTANCE
DBA_HIST_DATAFILE
DBA_HIST_DLM_MISC
DBA_HIST_EVENT_HISTOGRAM
DBA_HIST_FILESTATXS
DBA_HIST_IOSTAT_DETAIL
DBA_HIST_IOSTAT_FILETYPE
DBA_HIST_IOSTAT_FUNCTION
DBA_HIST_OSSTAT
DBA_HIST_PGASTAT
DBA_HIST_SERVICE_STAT
DBA_HIST_SGA
DBA_HIST_SGASTAT
DBA_HIST_SNAPSHOT
DBA_HIST_SQL_PLAN
DBA_HIST_SQLSTAT
DBA_HIST_SQLTEXT
DBA_HIST_SYS_TIME_MODEL
DBA_HIST_SYSSTAT
DBA_HIST_SYSTEM_EVENT
DBA_HIST_TEMPFILE
DBA_HIST_TEMPSTATXS

eAdam installation on Staging system

You install eAdam once and then use it multiple times. If you download a newer version just install it on top of the prior one, so you get the eAdam delta. eAdam should be installed on a Staging database and not in Production or UAT. Pretty much any database could be your Staging database (QA or any other lower environment). It could even be a database on your laptop for example. Your Staging database does not have to be the same platform or database release than Source.

To install eAdam you simply execute another script. It creates a schema (you provide the name and password), and this script creates the eAdam repository on your Staging database.

Loading into eAdam Stage a set of AWR  files extracted from Source

You can load into eAdam as many TAR files as you want. Each set is identified within eAdam with a sequence key. So your eAdam repository can contain AWR data from different systems, and they could be from same or different platforms and database releases. The data model of your eAdam repository is determined from your Staging database release, so it is ideal your Staging database is of equal or higher release than your Sources, but this is not mandatory.

To load a TAR file with AWR data into your Staging eAdam repository, you execute another script that asks for the TAR name and it produces a set of External Tables, then uploads the AWR data from the temporary external Tables into permanent staging Tables:

DBA_HIST_ACTIVE_SESS_HIST_S
DBA_HIST_DATABASE_INSTANC_S
DBA_HIST_DATAFILE_S
DBA_HIST_DLM_MISC_S
DBA_HIST_EVENT_HISTOGRAM_S
DBA_HIST_FILESTATXS_S
DBA_HIST_IOSTAT_DETAIL_S
DBA_HIST_IOSTAT_FILETYPE_S
DBA_HIST_IOSTAT_FUNCTION_S
DBA_HIST_OSSTAT_S
DBA_HIST_PGASTAT_S
DBA_HIST_SERVICE_STAT_S
DBA_HIST_SGASTAT_S
DBA_HIST_SGA_S
DBA_HIST_SNAPSHOT_S
DBA_HIST_SQLSTAT_S
DBA_HIST_SQLTEXT_S
DBA_HIST_SQL_PLAN_S
DBA_HIST_SYSSTAT_S
DBA_HIST_SYSTEM_EVENT_S
DBA_HIST_SYS_TIME_MODEL_S
DBA_HIST_TEMPFILE_S
DBA_HIST_TEMPSTATXS_S
DBA_HIST_XTR_CONTROL_S
DBA_TAB_COLUMNS_S

AWR Data mining on eAdam Stage

Once your AWR is available inside eAdam, you can perform all the Data Mining you may need. A sample script that produces several CSV files out of your data is provided. This sample script is automatically executed at the end of your upload, so you get a set of CSV files that can be used on Excel or any other tool that reads CSV files. I use Excel, where I can easily generate Charts out of the CSV files created by the sample script. That means I can easily visualize trends out of performance data without having access to the Source (Production) environment.

To produce the sample CSV files, eAdam provides a set of views on top of its own repository. These set of views will evolve over time as new releases become available. As of 1st release we provide the following views:

SH_AAS_APPLICATION_V1
ASH_AAS_CLUSTER_V1
ASH_AAS_COMMIT_V1
ASH_AAS_CONCURRENCY_V1
ASH_AAS_ON_CPU_V1
ASH_AAS_OTHER_V1
ASH_AAS_SCHEDULER_V1
ASH_AAS_TOTAL_V1
ASH_AAS_USER_IO_V1
ASH_INST_V1
ASH_RAC_V1
EVENT_HISTOGRAM_INST_V1
EVENT_HISTOGRAM_IO_RAC_V1
EVENT_HISTOGRAM_RAC_V1
EVENT_HISTOGRAM_RAC_V2
OSSTAT_BUSY_TIME_PERC_V1
OSSTAT_DELTA_V1
OSSTAT_INST_V1
OSSTAT_LOAD_V1
OSSTAT_RAC_V1
SYSTEM_EVENT_DELTA_V1
SYSTEM_EVENT_INST_V1
SYSTEM_EVENT_NON_IDLE_V1
SYSTEM_EVENT_RAC_V1
SYS_TIME_MODEL_DB_CPU_V3
SYS_TIME_MODEL_DB_TIME_V3
SYS_TIME_MODEL_DB_WAIT_V3
SYS_TIME_MODEL_DELTA_V1
SYS_TIME_MODEL_INST_V1
SYS_TIME_MODEL_RAC_V1

FAQ

Q1: Where can I download eAdam?

A1: From the Enkitec web page. Click on the “Products” tab. The tool will be available on March 7, 2014.

Q2: Is it really free?

A2: Yes. And before you ask what is the catch: “there is no catch”. Just be aware you must have an Oracle Diagnostics Pack license in order to access AWR data, and this eAdam tool is not an exception. Besides that, eAdam is free to download and use.

Q3: I need some extra functionality. How do I get it?

A3: If you need something that eAdam does not provide out of the box, of course you can extend its functionality directly. If the addition is something of general interest, you can submit an “Enhancement Request” (an email actually or a comment on this post). But it you want something more advanced and of particular use, you can contact Enkitec for a quote for this customization on top of eAdam (for example an Apex application).

Q4: Can I share this eAdam tool or its output?

A4: Sure you can. Just credit Enkitec for the tool. In other words, use it any way you want, but please honor authorship and ownership.

Q5: Who “owns” eAdam?

A5: Enkitec owns this new tool. Carlos Sierra is the author of eAdam, but the vision and some critical components were provided by: Frits Hoogland, Karl Arao and Randy Johnson. So eAdam is the product of a collaboration effort of some geeks working for Enkitec.

Conclusion

Enkitec is providing this eAdam tool for AWR Data Mining for free. Having an Oracle Diagnostics Pack is a must before using this tool. Besides that, feel free to use this tool at will, and perform all your AWR Data Mining outside the Source system, which is very important for a Production environment. This eAdam is very resource conscious on the Source system, and it empowers anyone to do performance analysis without having direct access to the Source database.

Having an AWR repository created with eAdam, enables many possibilities, like having baselines for particular processes, or compare performance between different time intervals (pre and post an application upgrade for example) or between two different systems (UAT and Production for example). If you already have a set of scripts to do data mining on DBA_HIST views, you can easily convert them to use the matching eAdam Staging tables so you would no longer be constrained to connect to the live system.

Performing Data Mining in entities like ASH as stored by AWR is like digging in a gold mine. There is so much the database wants to tell you. You just need this kind of of tool to listen carefully and find what is important.

Written by Carlos Sierra

March 5, 2014 at 7:29 am

Posted in Active Session History, ASH, AWR, eAdam, edb360, Scripts

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Meet “edb360”: a free tool that provides a 360-degree view of an Oracle database

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Simply put: edb360 is a new free tool that provides a 360-degree view of an Oracle database.

What is “edb360“?

This “edb360” tool is the product of a collaborative effort of some very smart guys, and me. Special thanks to Frits Hoogland, Karl Arao, Randy Johnson, Martin Bach, Kyle Hailey, Tanel Poder, Alex Fatkulin, Mauro Pagano, Abel Macias, Jon Adams and Jack Agustin. These guys helped me to envision edb360, some directly and some indirectly, but their help and shared knowledge motivated me to develop edb360 and make it available today.

The edb360 tool started as a quick and dirty “script” to gather basic information about a database without knowing anything about it before hand. The first rule for edb360 was: it has to install nothing in the database. The second rule became: it has to provide some insight about a database.

The output is presented for the most part into 3 formats: HTML, Text and Comma-separated Values (CSV). Why? HTML and Text can be easily used to consolidate important findings into a Word report. Sometimes HTML is more useful and sometimes Text is better. Then CSV is used to produce charts out of Performance Trends. Some people can visualize trends easier with a graph (me included).

What about other tools?

Of course there are wonderful tools that can help in this arena, like Oracle Enterprise Manager (OEM) or Oracle’s Automatic Workload Repository (AWR). So why not using those tools? Well, if I had access to OEM or I knew before hand which time intervals I want to analyze with AWR, then I would not have a strong need to use edb360. The reality that we consultants face when we are getting acquainted of a system, is that we are not given any access to the database of interest (usually production). And asking for a server account feels like asking for coke’s secret formula: then we simply cannot poke the database at our own will, and that is understandable. So, what is our second best?: please run this script that installs nothing and generates a zip file with some metadata from your system.  The script is plain text and its output is also plain text (html, text and csv files). So, any DBA or System Administration can validate that no customer confidential data is extracted or exposed. A win-win!

If the system we want to understand is an Exadata system, we can also request for an Exacheck output, if  not an Exadata system but a RAC cluster, there is Raccheck. These two tools, available though My Oracle Support (MOS) make a good companion for the edb360. In other words, edb360 is not a replacement for the other two but more of an add-on or companion.

Why is edb360 free?

Why not? Often I get asked: why do you give away the tools and scripts you develop? The answer is simple: tools, scripts, white papers, blog entries like this, in my mind they all represent the same: sharing knowledge with our Oracle community. I wish for a community where knowledge (and tools) flows for all to benefit. Let’s say my personal time I invest building tools and scripts kinds of make it up for my lame blog postings. 😉

What is the catch?

No catch. Just be aware that edb360 makes use of some DBA_HIST views and ASH data, and those are part of the Oracle Diagnostics Pack. So when executing the tool it will ask  to indicate if your site has those licenses. Your answer determines the scope of the output. So if you specify you have a license for the Oracle Diagnostics Pack then your edb360 output includes pieces from AWR and ASH, else AWR and ASH are not accessed.

About versions, feedback and support

For the most part, I am committed to maintain this tool as my personal time permits. That means I can only work on it during odd hours and not every day. Nothing different than SQLTXPLAIN during the first few years of its existence, so I am not scared. Keep also in mind this edb360 is work in progress, and version v1405 is the first one I feel comfortable sharing with the community. In other words, it is far from perfect and I foresee it growing in multiple directions.

If you like this tool, and want to enhance its output, get SQLHC from MOS 1366133.1, and place the sqlhc.sql script into the same db360/sql directory. By doing so, you will also get 3 SQL health-checks. In other words, edb360 is SQLHC aware.

Conclusion

If you like free tools and have a use for this edb360 tool, you might as well download it and give it a shot. Nothing to lose (besides a few minutes of your spare time). A sample output is also available under same link above.

Life is Good!

Written by Carlos Sierra

February 19, 2014 at 7:34 pm

SQL Monitor and SQL ASH Scripts are now available

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I just uploaded two new scripts to my set of “Shared Scripts“. These are the sqlmon.sql and the sqlash.sql. They both input a SQL_ID and produce some txt/html/zip output.

The sqlmon.sql produces SQL Monitor Reports for all executions available on SQL Monitor for a given SQL. It is RAC aware and its output includes both text and “active” reports. You must have an Oracle Tuning Pack license on the system where you may want to use it.

The sqlash.sql produces Active Session History (ASH) Reports for one SQL_ID. It is also RAC aware and output includes both text and html formats. It produces these ASH reports from both memory and AWR. You must have an Oracle Diagnostics Pack license on the system where you may want to use it.

These two scripts are light weight. Install nothing, change nothing. If you need a more robust diagnostic tool in these areas, please use SQLHC and/or SQLT. In the other hand, for a quick understanding of one SQL you may want to use the trio: planx.sql, sqlash.sql and sqlmon.sql.

Written by Carlos Sierra

October 15, 2013 at 9:03 pm