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Tanel Poder Blog

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- Linux, Oracle, SQL performance tuning and troubleshooting training & writing.

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title Tanel Poder Blog
description - Linux, Oracle, SQL performance tuning and troubleshooting training & writing.

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Home Internas Passa sumo
About Internas Passa sumo
Code Internas Passa sumo
Contact Internas Passa sumo
Topics Internas Passa sumo
Videos Internas Passa sumo
Consulting Internas Passa sumo
Training Internas Passa sumo
Practical Linux Performance & Troubleshooting Internas Passa sumo
Dimensional Analysis of System Performance with eBPF & xtop Internas Passa sumo
Efficient, Always-On Thread Level Observability with eBPF Externas Passa sumo
Testing the Datadog Explain Plan Visualizer with Oracle execution plans Internas Passa sumo
New scripts: vstat.sql & dstat.sql for showing Oracle Sysmetric history with 1-minute granularity Internas Passa sumo
xb.sql and xbi.sql - Explain Oracle Execution Plans Better! (Part 3 - Cardinality Misestimates) Internas Passa sumo
tabhisthybrid.sql: Display Oracle hybrid histograms and filter cardinality estimates Internas Passa sumo
pqr.sql: Generate QR Codes with Pure SQL in PostgreSQL Internas Passa sumo
The xCapture and xtop eBPF tools are now in beta, with a demo dataset Internas Passa sumo
CatVector Demo Website Internas Passa sumo
New Tool: xstack - Completely Passive eBPF Linux Stack Profiling Without Any Tracepoints Internas Passa sumo
Webinar: Testing High-Performance Vector Search With CatBench on Google AlloyDB Omni Internas Passa sumo
My Blog Has Turned 18 Years Old Internas Passa sumo
Catbench Vector Search App has Postgres Query Throughput and Latency Monitoring Now Internas Passa sumo
Using Postgres pg_test_fsync tool for testing low latency writes Internas Passa sumo
Find which Oracle SQL_ID hits the SQL*Net break/reset to client event Internas Passa sumo
New Tool: lsds - List All Linux Block Devices and Settings in One Place Internas Passa sumo
Optimizing eBPF I/O latency accounting when running 37M IOPS on a 384-CPU server Internas Passa sumo
xCapture v3: Linux Performance Analysis with Modern eBPF and DuckDB Internas Passa sumo
Core Function Words Translated between English, Spanish, German, French and Swedish Internas Passa sumo
When eBPF task->stack->pt_regs reads return garbage on the latest Linux kernels, blame Fred! Internas Passa sumo
TracepointArgs: List Any Linux Tracepoint with Their Arguments, Datatypes and Related Structs Internas Passa sumo
CatBench Vector Search Playground Internas Passa sumo
Embedding Vectors of the Same Image Rotated Over 360 Degrees Internas Passa sumo
SQL Plan Execution FlameGraphs with Loop and Row Counts Internas Passa sumo
Embedding Vectors vs. Vector Embeddings Internas Passa sumo
Video: Testing the Silk Platform in 2024 Interview (12 minutes) Internas Passa sumo
Testing the Silk Platform in 2024: Achieving 20 GiB/s I/O Throughput in a Single Cloud VM Internas Passa sumo
Visualizing and Comparing Embedding Vectors as Heatmaps (Videos) Internas Passa sumo
Visualizing and Comparing Embedding Vectors as Heatmaps Internas Passa sumo
Tracking, not Tracing, Linux Thread Activity for Complete System Visibility (eBPF Summit) Internas Passa sumo
Python Supports Profiling with Perf - How Does It Work? Internas Passa sumo
Can a User Process Consume Kernel Mode CPU Without a Syscall? Internas Passa sumo
Next Big Thing: X-Ray Vision for Linux Systems with eBPF Internas Passa sumo
Syscallargs: List All Linux System Calls With Their Arguments Internas Passa sumo
RTX4090 converted into an eGPU Internas Passa sumo
Oracle Hint Scopes and Join Level Cardinality Hint Internas Passa sumo
New Commenting System Internas Passa sumo
Oracle Shared Pool Internals: Allocated Chunk Status Indicators in Heap Dumps Internas Passa sumo
Oracle Index Parallel Degree Fix After Parallel Creation or Rebuild Internas Passa sumo
Report Current Oracle Session Wait Chains from GV$SESSION without ASH Internas Passa sumo
Advanced Oracle Troubleshooting Guide, Part 13: OStackProf for Linux, Unix & MacOSX Clients Internas Passa sumo
Testing Oracle's Use of Optane Persistent Memory, Part 2 - Fast Log File Sync Waits Internas Passa sumo
Testing Oracle's Use of Optane Persistent Memory, Part 1 - Low Latency Commits Internas Passa sumo
MySQL Now Shows its Thread Names at OS Level for Better Troubleshooting Internas Passa sumo
xb.sql and xbi.sql - Explain Oracle Execution Plans Better! (Part 2) Internas Passa sumo
My New Learning Platform and What I'm Up To in 2022 Internas Passa sumo
Achieving 10 GB/s Scanning Rate in a Single Cloud VM Internas Passa sumo
Testing The Silk Platform - Hands-On Technical Analysis of High-Performance I/O in the Cloud Internas Passa sumo
Virtual Conference: Troubleshooting Very Complex Oracle Performance Problems Internas Passa sumo
Do Not Use '>' in Your Command Prompt (and How to Stay Safe in Shell) Internas Passa sumo
Is Your Linux Version Hiding Interrupt CPU Usage From You? Internas Passa sumo
Video: High Performance Block I/O on Linux Internas Passa sumo
Achieving 11M IOPS & 66 GiB/s IO on a Single ThreadRipper Workstation Internas Passa sumo
Oracle Wait Event Name vs. Display Name Internas Passa sumo
Measuring Java JVM thread activity in Linux with task state sampling Internas Passa sumo
Reasons why SELECT * is bad for SQL performance Internas Passa sumo
High System Load with Low CPU Utilization on Linux? Internas Passa sumo
Hacking Session: 7 Levels of Hint Invalidity in Oracle SQL Internas Passa sumo
Hacking Session: Oracle SQL Monitoring - Understanding the Execution Timeline column and CPU usage Internas Passa sumo
Virtual Conference: Systematic Oracle SQL Optimization Interview Videos Internas Passa sumo
Oracle Fatal Background Processes Internas Passa sumo
Virtual Conference Update: Systematic Oracle SQL Optimization in 2020 Internas Passa sumo
Oracle Shared Pool Internals: List Chunk Position in the LRU List Internas Passa sumo
SchedLat: a Low Tech Script for Measuring Process CPU Scheduling Latency on Linux Internas Passa sumo
Announcing My Retirement (in 2030)! Internas Passa sumo
ORA-12850: Could not allocate slaves on all specified instances error and a workaround for my scripts Internas Passa sumo
Oracle Performance Troubleshooting Without OS Access, Part 1: Identifying CPU Scheduling Latency Internas Passa sumo
Video: Troubleshooting Complex Oracle Performance Problems (Jan 2020) Internas Passa sumo
Hacking Session: Troubleshooting Complex Oracle Performance Problems (January 2020) Internas Passa sumo
help.sql: Show TPT Script Purpose and Syntax Internas Passa sumo
Oracle State Objects and Reading System State Dumps Hacking Session Video Internas Passa sumo
New scripts: xb.sql and xbi.sql - Explain Oracle Execution Plans Better! (Part 1) Internas Passa sumo
Dump Current Oracle SQL Execution Plan Line ID Using Oradebug Internas Passa sumo
pSnapper: Linux Process Snapper Page and Videos Internas Passa sumo
Announcing Linux Process Snapper tool and a Linux Troubleshooting Hacking Session (3rd April 9am PDT) Internas Passa sumo
What Caused This Wait Event: Using Oracle's wait_event[] tracing Internas Passa sumo
Tutorial: Troubleshooting Linux SSH Login Delay - Why does logging in always take 10 seconds? Internas Passa sumo
Practical Linux Performance & Application Troubleshooting Training Details and Table of Contents Internas Passa sumo
Scripts for Drilling Down Into Unknown Optimizer Changes Internas Passa sumo
Visualizing SQL Plan Execution Time With FlameGraphs Internas Passa sumo
Generate Oracle SQL Monitoring Reports as HTML using SQL Developer v18.3 (no Flash needed) Internas Passa sumo
Log file switch (checkpoint incomplete) wait events and LGWR waiting for checkpoint progress Internas Passa sumo
Oracle SQL Monitoring and Advanced ASH Usage Hacking Sessions! Internas Passa sumo
Oracle SQL Tuning training & Oracle Troubleshooting training and some Linux stuff too! Internas Passa sumo
Webinar: Troubleshooting a Complex Oracle Performance Issue Internas Passa sumo
My Performance & Troubleshooting scripts (TPT) for Oracle are now in GitHub and open sourced Internas Passa sumo
Video: Oracle X$TRACE, Wait Event Internals and Background Process Communication Internas Passa sumo
Secret Hacking Session: Oracle Background Process Communication, Exotic Wait Events and Some Tracing too Internas Passa sumo
Advanced Oracle Troubleshooting seminar in 2018! Internas Passa sumo
Apache Impala Internals Deep Dive with Tanel Poder + Gluent New World Training Month Internas Passa sumo
GNW01: In-Memory Processing for Databases Internas Passa sumo
My BIWA Summit Presentations Internas Passa sumo
RAM is the new disk – and how to measure its performance – Part 3 – CPU Instructions & Cycles Internas Passa sumo
My New Youtube Channel Internas Passa sumo
Troubleshooting Another Complex Performance Issue – Oracle direct path inserts and SEG$ contention Internas Passa sumo
SQL Monitoring in Oracle Database 12c Internas Passa sumo
Advanced Oracle Troubleshooting v2.5 (with 12c stuff too) Internas Passa sumo
RAM is the new disk – and how to measure its performance – Part 2 – Tools Internas Passa sumo
RAM is the new disk – and how to measure its performance – Part 1 – Introduction Internas Passa sumo
The Hybrid World is Coming Internas Passa sumo
Old ventures and new adventures Internas Passa sumo
Advanced Oracle Troubleshooting Guide – Part 12: control file reads causing enq: SQ – contention waits? Internas Passa sumo
Sqlplus is my second home, part 8: Embedding multiple sqlplus arguments into one variable Internas Passa sumo
Oracle Exadata Performance: Latest Improvements and Less Known Features Internas Passa sumo
Oracle In-Memory Column Store Internals – Part 1 – Which SIMD extensions are getting used? Internas Passa sumo
About index range scans, disk re-reads and how your new car can go 600 miles per hour! Internas Passa sumo
Combining Bloom Filter Offloading and Storage Indexes on Exadata Internas Passa sumo
What the heck are the /dev/shm/JOXSHM_EXT_x files on Linux? Internas Passa sumo
Oracle Memory Troubleshooting, Part 4: Drilling down into PGA memory usage with V$PROCESS_MEMORY_DETAIL Internas Passa sumo
Slides of my previous presentations Internas Passa sumo
Where does the Exadata storage() predicate come from? Internas Passa sumo
Oracle X$ tables – Part 1 – Where do they get their data from? Internas Passa sumo
cell flash cache read hits vs. cell writes to flash cache statistics on Exadata Internas Passa sumo
Hard Drive Predictive Failures on Linux and Exadata Internas Passa sumo
When do Oracle Parallel Execution Slaves issue buffered physical reads – Part 2? Internas Passa sumo
When do Oracle Parallel Execution Slaves issue buffered physical reads – Part 1? Internas Passa sumo
Diagnosing buffer busy waits with the ash_wait_chains.sql script (v0.2) Internas Passa sumo
SGA bigger than the amount of HugePages configured (Linux – 11.2.0.3) Internas Passa sumo
Why doesn’t ALTER SYSTEM SET EVENTS set the events or tracing immediately? Internas Passa sumo
Advanced Oracle Troubleshooting Guide – Part 11: Complex Wait Chain Signature Analysis with ash_wait_chains.sql Internas Passa sumo
Oracle Performance & Troubleshooting Online Seminars in 2013 Internas Passa sumo
Scalar Subqueries in Oracle SQL WHERE clauses (and a little bit of Exadata stuff too) Internas Passa sumo
ShowMOS: How to get rid of the annoying “The Page has Expired” dialog in My Oracle Support Internas Passa sumo
Oracle 12c: Scalar Subquery Unnesting transformation Internas Passa sumo
Oracle Database 12c R1 (12.1.0.1.0) is finally released! Internas Passa sumo
Getting the Most Out of ASH online seminar Internas Passa sumo
Forcing Smart Scans on Exadata – is the _serial_direct_read parameter safe to use in production? Internas Passa sumo
Debugger Dangers – Part 2 Internas Passa sumo
List Exadata Storage Cell disk summary with cellpd.sql and cellpdx.sql scripts Internas Passa sumo
List Exadata Disk Layout and Topology with the exadisktopo scripts Internas Passa sumo
V$CELL_THREAD_HISTORY – “ASH” for Exadata Storage Cells Internas Passa sumo
Understanding what a hint affects using the V$SQL_FEATURE views Internas Passa sumo
Listing Exadata storage cells and their configuration info from V$CELL_CONFIG Internas Passa sumo
Alter session force parallel query doesn’t really force anything Internas Passa sumo
asqlmon.sql: SQL Monitoring-like execution plan line level drilldown into SQL response time Internas Passa sumo
ExaSnapper 0.7 beta download and the hacking session videos Internas Passa sumo
Peeking into Linux kernel-land using /proc filesystem for quick’n’dirty troubleshooting Internas Passa sumo
Even more Snapper – v4.03 now works in SQL Developer too! Internas Passa sumo
Manual “before” and “after” snapshot support in Snapper v4 Internas Passa sumo
Snapper v4.02 and the Snapper launch party video Internas Passa sumo
Drilling Deep Into Exadata Performance with ASH, SQL Monitoring and Exadata Snapper – slides and a hacking session! Internas Passa sumo
Troubleshooting high CPU usage with poor-man’s stack profiler – in a one-liner! Internas Passa sumo
Session Snapper v4 – The World’s Most Advanced Oracle Troubleshooting Script! Internas Passa sumo
Sqlplus is my second home: Part 7 – Downloading files via sqlplus :-) Internas Passa sumo
Japanese translation of some of my blog articles Internas Passa sumo
What the heck is the INTERNAL_FUNCTION in execution plan predicate section? Internas Passa sumo
A tip for lazy Oracle users – type less with ANSI DATE and TIMESTAMP SQL syntax Internas Passa sumo
Snapper v3.61 released – and more work is in progress! Internas Passa sumo
Select statement generating redo – and lost write detection Internas Passa sumo
Sqlplus is my second home: Part 6 – Colorizing sqlplus and terminal output Internas Passa sumo
Optimizer statistics-driven direct path read decision for full table scans (_direct_read_decision_statistics_driven) Internas Passa sumo
The limitations of CURSOR_SHARING = FORCE and FORCE_MATCHING_SIGNATURE for SQL plan stability Internas Passa sumo
MOATS-like sqlplus “top” utility for RAC Internas Passa sumo
Oradebug hanganalyze with a prelim connection and “ERROR: Can not perform hang analysis dump without a process state object and a session state object.” Internas Passa sumo
Advanced Oracle Troubleshooting Guide – Part 10: Index unique scan doing multiblock reads?! Internas Passa sumo
Where is LOB data stored? Internas Passa sumo
Exadata Smart Scan predicate offloading and sequence.NEXTVAL Internas Passa sumo
Create a database link with the new host:port/service syntax Internas Passa sumo
Oracle Core: Essential Internals for DBAs and Developers book by Jonathan Lewis Internas Passa sumo
Profiling trace files with preprocessor external tables in 11g and some parallel execution hacking Internas Passa sumo
Evil things are happening in Oracle Internas Passa sumo
What the heck is the SQL Execution ID – SQL_EXEC_ID? Internas Passa sumo
V8 Bundled Exec call – and Oracle Program Interface (OPI) calls Internas Passa sumo
Full scans, direct path reads and ORA-8103 error hacking session video Internas Passa sumo
Are you getting the most out of your Exadata performance? Part 1 Internas Passa sumo
What is the purpose of segment level checkpoint before DROP/TRUNCATE of a table? Internas Passa sumo
Another cache buffers chains latch contention troubleshooting example using LatchProf Internas Passa sumo
Tech Reviewer, Tech Reviewer! ;-) Internas Passa sumo
IOUG Select Journal Editor’s Choice Award 2011 Internas Passa sumo
Knowing what you want to achieve before thinking of how to achieve it – a query optimization example Internas Passa sumo
Running SELECT … INTO :bind_variable from SQL Internas Passa sumo
Latch contention troubleshooting case study and Flashback Database performance issues with LOBs Internas Passa sumo
MOATS: The Mother of All Tuning Scripts! Internas Passa sumo
An index of my TPT scripts Internas Passa sumo
LOBREAD SQL Trace entry in Oracle 11.2 (and tracing OPI calls with event 10051) Internas Passa sumo
Implicit datatype conversion in the parsing phase – something new I learned today! Internas Passa sumo
ORA-4031 errors, contention, cursor management issues and shared pool fragmentation – free secret seminar! Internas Passa sumo
Exadata CAN do smart scans on bitmap indexes Internas Passa sumo
Oracle Exadata Performance series – Part 1: Should I use Hugepages on Linux Database Nodes? Internas Passa sumo
Finding Oracle Homes which Oracle instances are using on Linux Internas Passa sumo
New cursor_bind_capture_destination parameter in Oracle 11.2.0.2 Internas Passa sumo
Performance Stories from Exadata Migrations Internas Passa sumo
Is this valid SQL syntax? :-) Internas Passa sumo
Snapper 3.52 – With Oracle 9.2 support! Internas Passa sumo
Asynch descriptor resize wait event in Oracle Internas Passa sumo
A little new feature for shared pool geeks :-) Internas Passa sumo
COUNT STOPKEY operation (the where ROWNUM <= N predicate) doesn't process over ~4 Billion rows and returns wrong results Internas Passa sumo
Read currently running SQL statement’s bind variable values using V$SQL_MONITOR.BIND_XML in Oracle 11.2 Internas Passa sumo
The most fundamental difference between hash and nested loop joins Internas Passa sumo
Oracle Closed World presentation links Internas Passa sumo
Which number takes more space in an Oracle row? Internas Passa sumo
Exadata v2 Smart Scan Performance Troubleshooting article Internas Passa sumo
Dropping and creating tables in read only tablespaces?! Internas Passa sumo
The full power of Oracle’s diagnostic events, part 2: ORADEBUG DOC and 11g improvements Internas Passa sumo
Oracle memory troubleshooting article Internas Passa sumo
Flexible Sqlplus command line history with RLWRAP Internas Passa sumo
Execution plan Quiz: Shouldn’t these row sources be the other way around ;-) Internas Passa sumo
Quiz: Explaining index creation Internas Passa sumo
cursor: pin S waits, sporadic CPU spikes and systematic troubleshooting Internas Passa sumo
KGH: NO ACCESS – Buffer cache inside streams pool too! Internas Passa sumo
Non-trivial performance problems Internas Passa sumo
Calculate SQL_ID and SQL_HASH_VALUE from SQL text Internas Passa sumo
Oracle Latch Contention Troubleshooting Internas Passa sumo
Oracle Session Snapper v3.10 Internas Passa sumo
How to CANCEL a query running in another session? Internas Passa sumo
New versions of LatchProf and LatchProfX for latch contention troubleshooting and tuning Internas Passa sumo
Oracle Troubleshooting: How to read Oracle ERRORSTACK output?! Internas Passa sumo
Using Process Memory Matrix script for calculating Oracle process memory usage on Solaris Internas Passa sumo
Oracle Wait Event reference Internas Passa sumo
Oracle Peformance Visualization… Internas Passa sumo
Bind Variable Peeking – execution plan inefficiency Internas Passa sumo
Recursive sessions… Internas Passa sumo
Sometimes things are easy (Part 1): How to fix wrapped execution plan text? Internas Passa sumo
Beyond Oracle Wait Interface – Part 2 Internas Passa sumo
NULL is not zero! Internas Passa sumo
Measuring what matters Internas Passa sumo
Finding the reasons for excessive logical IOs Internas Passa sumo
Explain Plan For command may show you the wrong execution plan – Part 1 Internas Passa sumo
Detect chained and migrated rows in Oracle – Part 1 Internas Passa sumo
What’s a good way to learn some Oracle internals every day? Internas Passa sumo
SystemTap is production supported in Redhat EL5.4 Internas Passa sumo
KGL simulator, shared pool simulator and buffer cache simulator – what are these? Internas Passa sumo
KGH: NO ACCESS allocations in V$SGASTAT – buffer cache within shared pool! Internas Passa sumo
Oracle 11gR2 has been released – and with column oriented storage option Internas Passa sumo
latch: cache buffers chains latch contention – a better way for finding the hot block Internas Passa sumo
Select COUNT(*) and COUNT(column) are different things! Internas Passa sumo
Alter system kill session and ORA-00031: session marked for kill Internas Passa sumo
An interview with me Internas Passa sumo
How to detect when a cursor was closed from SQL trace output? Internas Passa sumo
Identify the SQL statement causing those WAIT #X lines in a (top-truncated) sql tracefile Internas Passa sumo
(Secret) Preview of Oracle 12g CBO leaked from Oracle labs… Internas Passa sumo
Oracle memory troubleshooting, Part 3: Automatic top subheap dumping with heapdump Internas Passa sumo
Using Perfsheet and TPT scripts for solving real life performance problems Internas Passa sumo
ORA-04031 errors and monitoring shared pool subpool memory utilization with sgastatx.sql Internas Passa sumo
Oracle Performance Visualization videos from Sydney Internas Passa sumo
Scripts for showing execution plans via plain SQL and also in Oracle 9i Internas Passa sumo
“Free” DBA_HIST AWR views in 11g… Internas Passa sumo
I have been troubleshooting since I was a kid! :) Internas Passa sumo
Tracing Oracle SQL plan execution with DTrace Internas Passa sumo
Seminar feedback and pictures from Singapore Internas Passa sumo
Read OS environment variables using DBMS_SYSTEM.GET_ENV() Internas Passa sumo
I’m an Oracle ACE Director now :) Internas Passa sumo
Oracle 11g: Reading alert log via SQL Internas Passa sumo
Another LatchProfX use case Internas Passa sumo
The real history of Oracle database revealed! Internas Passa sumo
Oracle, Timesten and PL/SQL support Internas Passa sumo
The full power of Oracle’s diagnostic events, part 1: Syntax for KSD debug event handling Internas Passa sumo
60000 bind variables?! Maybe it’s time to use a temporary table instead… Internas Passa sumo
SQL_ID is just a fancy representation of hash value Internas Passa sumo
Performance Visualization, Capacity planning and Hotsos Symposium Internas Passa sumo
When was a table last changed? Internas Passa sumo
Multipart cursor subexecution and PRECOMPUTE_SUBQUERY hint Internas Passa sumo
Identifying shared memory segment users using lsof Internas Passa sumo
Reliable latch waits and a new blog Internas Passa sumo
Oracle memory troubleshooting, Part 1: Heapdump Analyzer Internas Passa sumo
Performance Visualization made easy – PerfSheet 2.0 beta Internas Passa sumo
A little oradebug enhancement in Oracle 11g Internas Passa sumo
Advanced Oracle Troubleshooting Guide, Part 9 – Process stack profiling from sqlplus using OStackProf Internas Passa sumo
Transportable tablespaces and ROWID uniqueness Internas Passa sumo
VLDB 2008 proceedings, Oracle optimizer plan stability, adaptive cursor sharing and SecureFiles Internas Passa sumo
Oracle hidden costs revealed, Part2 – Using DTrace to find why writes in SYSTEM tablespace are slower than in others Internas Passa sumo
Flexible sampling of any V$ or X$ view with sample.sql Internas Passa sumo
Case study on some rowcache internals, cached non-existent objects and a describe bug Internas Passa sumo
Why does even a small difference in SQL text cause a hard parse? Internas Passa sumo
Script: Display valid values for multioption parameters (including hidden parameters) Internas Passa sumo
The simplest query for checking what’s happening in a database Internas Passa sumo
Library cache latches gone in Oracle 11g Internas Passa sumo
Advanced Oracle Troubleshooting Guide, Part 8: Even more detailed latch troubleshooting using LatchProfX Internas Passa sumo
Closed database and WITH subquery Internas Passa sumo
Advanced Oracle Troubleshooting Guide, Part 7: Sampling latch holder statistics using LatchProf Internas Passa sumo
Another use case for WaitProf – diagnosing “events in waitclass Other” Internas Passa sumo
Killing an Oracle process from inside Oracle Internas Passa sumo
cursor_space_for_time To Be Deprecated Internas Passa sumo
Advanced Oracle Troubleshooting Guide, Part 6: Understanding Oracle execution plans with os_explain Internas Passa sumo
Debugger dangers Internas Passa sumo
Short note on KGX Mutexes Internas Passa sumo
Generating lots of rows using connect by – safely! Internas Passa sumo
Advanced Oracle Troubleshooting Guide, Part 5: Sampling V$ stuff with WaitProf. Really fast. Using SQL! Internas Passa sumo
Performance Tools Quick Reference Guide Internas Passa sumo
Advanced Oracle Troubleshooting Guide, Part 4: Diagnosing a long parsing issue Internas Passa sumo
Snapper shortcut Internas Passa sumo
Querying the current tracefile name, using SQL – with tracefile_identifier Internas Passa sumo
Oracle Troubleshooting with Snapper – detecting who’s causing excessive redo generation Internas Passa sumo
Performance and Scalalability Improvements in Oracle 10g and 11g Internas Passa sumo
Using autonomous transactions for sleeping Internas Passa sumo
SQL*Net break/reset to client Internas Passa sumo
SQL*Net message to client vs SQL*Net more data to client Internas Passa sumo
SQL*Net message to client wait isn’t really what it’s thought to be Internas Passa sumo
Oracle hidden costs revealed, part 1 – Does a batch job run faster when executed locally? Internas Passa sumo
Excellent article on Oracle 11g PL/SQL function result cache Internas Passa sumo
Can you write a working SQL statement without using any whitespace? Internas Passa sumo
Expensive calculator… Internas Passa sumo
Why does Oracle parameter count change during session lifetime? Internas Passa sumo
Systematic application troubleshooting in Unix Internas Passa sumo
Perl version of Snapper Internas Passa sumo
Sqlplus is my second home, part 5: Reading the name of currently executing script Internas Passa sumo
Oracle Security, Part 2: Your read only accounts aren’t that read only Internas Passa sumo
Sqlplus is my second home, part 4: Getting sqlplus parameter value into a variable Internas Passa sumo
A simple interview question Internas Passa sumo
How to resolve SQL object and column names all the way to base tables and columns in Oracle? Internas Passa sumo
Advanced Oracle Troubleshooting Guide, Part 3: More adventures in process stack Internas Passa sumo
Sqlplus is my second home, part 3: Colored selections in Windows XP command prompt Internas Passa sumo
Sqlplus is my second home, part 2: Running SQL scripts from remote locations using HTTP Internas Passa sumo
Operating systems are lazy allocating memory Internas Passa sumo
Advanced Oracle Troubleshooting Guide, Part 2: No magic is needed, systematic approach will do Internas Passa sumo
Oracle Session Snapper, part 2: Getting most out of Snapper Internas Passa sumo
Oracle 11g internals part 1: Automatic Memory Management Internas Passa sumo
Oracle Session Snapper – real-time session-level performance stats for DBAs Internas Passa sumo
Sqlplus is my second home, Part 1: HTMLizing your sqlplus output Internas Passa sumo
Session-level statspack Internas Passa sumo
A gotcha with parallel index builds, parallel degree and query plans Internas Passa sumo
My version of SQL string to table tokenizer Internas Passa sumo
Advanced Oracle Troubleshooting Guide: When the wait interface is not enough [part 1] Internas Passa sumo

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part 50
troubleshooting 48
sql 41
performance 33

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HTML obsoleto

Etiquetas obsoletas Ocorrências
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Etiquetas HTML obsoletas são etiquetas que já não são usadas segundo as normas mais recentes. É recomendado que sejam removidas ou substituídas por outras etiquetas atualizadas.

Dicas de Velocidade

Excelente, este site não usa tablelas dentro de tabelas.
Oh não, o site usa estilos CSS nas etiquetas HTML.
Boa, o site usa poucos ficheiros CSS.
Perfeito, o site usa poucos ficheiros JavaScript.
Perfeito, o site tira vantagens da compressão gzip.

Dispositivos Móveis

Otimização para dispositivos móveis

Icon Apple
Meta Viewport Tag
Conteúdo Flash

Otimização

XML Sitemap

Perfeito, o site tem um mapa XML do site (sitemap).

https://tanelpoder.com/sitemap.xml

Robots.txt

https://tanelpoder.com/robots.txt

Perfeito, o seu site tem um ficheiro robots.txt.

Analytics

Em falta

Não detetámos nenhuma ferramenta analítica de análise de atividade.

Este tipo de ferramentas (como por exemplo o Google Analytics) permite perceber o comportamento dos visitantes e o tipo de atividade que fazem. No mínimo, uma ferramenta deve estar instalada, sendo que em algumas situações mais do que uma pode ser útil.

PageSpeed Insights

Dispositivo
Categorias

Free SEO Testing Tool

Free SEO Testing Tool é uma ferramenta gratuita que o ajuda a avaliar o seu site