MySQL :: MySQL Forums :: Optimizer & Parser

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• Announcing January 2023 Releases featuring MySQL 8.0.32	01/17/2023 10:40PM

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Sticky: MySQL 8.0: Hash Join and EXPLAIN ANALYZE (1 Posts)

625

Edwin Desouza

10/01/2019 05:40PM

Sticky: MySQL 8.0: One Giant Leap For SQL (1 Posts)

942

Edwin Desouza

04/25/2018 10:16AM

Sticky: Unofficial MySQL 8.0 Optimizer Guide (1 Posts)

1,267

Edwin Desouza

02/13/2017 04:16PM

Sticky: MySQL 8.0: Window Functions (1 Posts)

1,123

Edwin Desouza

02/04/2017 08:57PM

Sticky: MySQL 8.0: CTEs (1 Posts)

1,536

Edwin Desouza

10/18/2016 09:38AM

Sticky: MySQL 8.0: Optimizer & Parser (1 Posts)

1,657

Edwin Desouza

09/13/2016 10:54AM

Sticky: MySQL Performance Tuning (1 Posts)

2,271

Edwin Desouza

07/06/2015 10:37AM

Sticky: MySQL Parser (1 Posts)

3,249

Edwin Desouza

04/03/2014 03:31PM

Sticky: MySQL Optimizer: Features in MySQL 5.7 (1 Posts)

4,434

Edwin Desouza

12/18/2012 11:38AM

Sticky: MySQL EXPLAIN (1 Posts)

4,894

Edwin Desouza

07/10/2012 10:32AM

Sticky: MySQL Optimizer: Blogs (1 Posts)

10,758

Edwin DeSouza

04/28/2007 06:20PM

MySQL Hypergraph Optimizer for HeatWave

Edwin Desouza

01/17/2023 09:20AM

what does explain ref const, const means ?

jongse park

11/23/2022 12:00AM

Set Theory in MySQL 8.0: UNION and Now INTERSECT and EXCEPT

Edwin Desouza

11/02/2022 10:25AM

Plugin For Obtaining Tokenized Query

JustADude Tester

10/19/2022 08:23AM

Startup was very slow

578

Charles Rodrigues Rimiru

01/27/2022 07:53AM

Re: Startup was very slow

120

Peter Brawley

02/28/2022 11:14AM

Re: Startup was very slow

118

Charles Rodrigues Rimiru

03/02/2022 08:58AM

Re: Startup was very slow

191

Peter Brawley

03/02/2022 10:58AM

Re: Startup was very slow

137

Charles Rodrigues Rimiru

03/02/2022 01:57PM

Re: Startup was very slow

Charles Rodrigues

10/09/2022 09:24AM

Why MySQL adding 1 when calculating the records per key?

ffc ddd

09/24/2022 07:16PM

Why MySQL adding 1 when calculating the records per key?

ffc ddd

09/24/2022 07:10PM

MYSQL5.7:OPTIMIZER Contradict Explain

114

yijie fu

09/07/2022 05:02AM

Re: MYSQL5.7:OPTIMIZER Contradict Explain

yijie fu

09/07/2022 05:26AM

Need help with getting rid of filesort

157

Marvin Herbold

06/23/2022 01:53PM

Re: Need help with getting rid of filesort

Peter Brawley

06/24/2022 09:59AM

MySQL 8.0 EXPLAIN ANALYZE

190

Edwin Desouza

02/27/2022 10:37PM

Optimizer in 8.0 in some cases not materializing subquery

366

Benjamin Peikes

01/24/2022 03:37PM

Re: Optimizer in 8.0 in some cases not materializing subquery

123

Peter Brawley

01/24/2022 04:45PM

Running sql in server is too much slower then laptop

384

Shanxiang MAO

10/25/2021 02:49AM

Re: Running sql in server is too much slower then laptop

153

Peter Brawley

10/25/2021 09:50AM

Re: Running sql in server is too much slower then laptop

129

Herems Jing

11/13/2021 07:59PM

Re: Running sql in server is too much slower then laptop

129

Peter Brawley

11/13/2021 09:21PM

Query optimization on LIKE

321

Sing Lau

10/04/2021 12:08PM

Re: Query optimization on LIKE

176

Peter Brawley

10/04/2021 01:08PM

Multi-valued index is not in possible keys when there is a subquery

353

Jinlin Yang

07/22/2021 07:18PM

Re: Multi-valued index is not in possible keys when there is a subquery

150

Peter Brawley

10/04/2021 12:55PM

Run ANALYZE TABLE — Do Not Rely on InnoDB's Automatic Recalculation of Statistics

383

Edwin Desouza

09/08/2021 09:52AM

MySQL: EXPLAINing the Different EXPLAINS

347

Edwin Desouza

08/19/2021 02:57PM

Disable caching in MYSQL for True performance testings?

486

Sing Lau

07/11/2021 02:47PM

Re: Disable caching in MYSQL for True performance testings?

230

Peter Brawley

07/11/2021 05:21PM

Documentation regarding operator precedence incorrect for LIKE, REGEXP, IN?

334

Justin Ng

06/12/2021 01:29PM

How to optimizate COUNT query with multiple LEFT JOIN

392

Ivan Stoqnov

06/01/2021 01:19AM

Re: How to optimizate COUNT query with multiple LEFT JOIN

196

Ivan Stoqnov

06/01/2021 01:31AM

Re: How to optimizate COUNT query with multiple LEFT JOIN

191

Peter Brawley

06/01/2021 12:19PM

Need help with tracing how identifiers are parsed; dot-reserved vs dot-space-reserved

361

Justin Ng

05/25/2021 05:28AM

Re: Need help with tracing how identifiers are parsed; dot-reserved vs dot-space-reserved

180

Justin Ng

05/25/2021 06:21AM

MySQL Invisible Column

449

Edwin Desouza

01/22/2021 01:48PM

mySQL 8 - view query not using outer predicate

525

Jack Crawford

01/11/2021 10:49AM

Re: mySQL 8 - view query not using outer predicate

240

Peter Brawley

01/11/2021 12:07PM

Re: mySQL 8 - view query not using outer predicate

276

Jack Crawford

01/11/2021 12:18PM

Re: mySQL 8 - view query not using outer predicate

246

Peter Brawley

01/11/2021 01:38PM

Re: mySQL 8 - view query not using outer predicate

242

Jack Crawford

01/11/2021 02:06PM

Re: mySQL 8 - view query not using outer predicate

229

Peter Brawley

01/11/2021 03:02PM

Re: mySQL 8 - view query not using outer predicate

243

Jack Crawford

01/11/2021 04:04PM

Re: mySQL 8 - view query not using outer predicate

255

Peter Brawley

01/11/2021 10:34PM

MySQL Comparing INTs and CHARs

448

Edwin Desouza

08/24/2020 02:56PM

MySQL 8.0 Indexes, Histograms, and Other Ways to Speed Up Your Queries

467

Edwin Desouza

08/04/2020 07:57PM

MySQL: Using SKIP LOCK For Queue Processing

634

Edwin Desouza

08/03/2020 10:00AM

MySQL 8.0: Modern approaches to replacing accumulation user-defined variable hacks, via Window functions and CTEs

511

Saverio Miroddi

06/16/2020 10:00AM

MySQL 8.0.20: Index-Level Optimizer Hints

539

Edwin Desouza

04/28/2020 09:04AM

Explain features

634

Michael Bialik

03/29/2020 01:29PM

Re: Explain features

346

Peter Brawley

03/29/2020 02:01PM

MySQL 8.0: using CTEs to generate Sequences/Ranges

509

Edwin Desouza

03/09/2020 01:23PM

MySQL 8.0: A must-know about NOT IN in SQL – more antijoin optimization

591

Edwin Desouza

02/28/2020 11:12AM

msqldump only one row per minute from a 5 row/minute database

550

Adrian C

02/22/2020 12:38PM

Re: msqldump only one row per minute from a 5 row/minute database

322

Peter Brawley

02/22/2020 01:46PM

MySQL 8.0: EXPLAIN ANALYZE

534

Edwin Desouza

02/14/2020 11:29PM

Explain command type "All" issue

579

Vipin PA

02/14/2020 03:20AM

Re: Explain command type "All" issue

328

Peter Brawley

02/14/2020 10:28AM

Re: Explain command type "All" issue

326

Edwin Desouza

02/14/2020 05:52PM

Introduction to MySQL 8.0 CTEs (Part 1+2)

590

Edwin Desouza

02/13/2020 12:02PM

MySQL 8.0: Hash Join

514

Edwin Desouza

02/09/2020 05:09PM

MySQL 8.0: Simple way to figure out why your recursive CTE is running away

532

Edwin Desouza

01/15/2020 06:06AM

optimizer seems to skip stored function call in where clause?

590

John LeSueur

01/08/2020 11:07AM

Re: optimizer seems to skip stored function call in where clause?

441

John LeSueur

01/08/2020 11:21AM

Re: optimizer seems to skip stored function call in where clause?

279

John LeSueur

01/08/2020 11:44AM

Re: optimizer seems to skip stored function call in where clause?

380

Peter Brawley

01/08/2020 01:11PM

MySQL 8.0: AntiJoin

567

Edwin Desouza

12/18/2019 07:54AM

MySQL 8.0: Hash Join

632

Edwin Desouza

11/13/2019 12:36PM

MySQL 8.0: Understanding Hash Joins

560

Edwin Desouza

10/30/2019 11:06AM

Explain Analyze in MySQL 8

579

Edwin Desouza

10/28/2019 05:00PM

optimizing searches using aggregate data in join

770

Matthew Lenz

10/21/2019 09:05AM

Re: optimizing searches using aggregate data in join

341

Peter Brawley

10/21/2019 11:37AM

MySQL 8.0: EXPLAIN ANALYZE

670

Edwin Desouza

10/17/2019 07:15AM

MySQL 8.0.18 Maintenance Release is Generally Available

665

Edwin Desouza

10/14/2019 01:06PM

Slow Query

1,001

Deepak Nirmul

06/21/2019 04:47AM

Re: Slow Query

476

Peter Brawley

06/21/2019 10:17AM

Re: Slow Query

446

Deepak Nirmul

06/24/2019 02:18AM

Re: Slow Query

397

Peter Brawley

06/24/2019 09:56AM

Re: Slow Query

400

Deepak Nirmul

06/24/2019 10:15AM

Re: Slow Query

445

Peter Brawley

06/24/2019 10:45AM

Re: Slow Query

407

Gopal venkat

09/04/2019 11:47AM

Gopal, please don't hijack threads

375

Peter Brawley

09/04/2019 02:32PM

Re: Slow Query

360

marimuthu B

09/06/2019 05:59AM

Re: Slow Query

431

Peter Brawley

09/06/2019 09:57AM

MySQL 8.0: Supporting all kinds of outer references in derived tables (lateral, or not)

567

Edwin Desouza

07/12/2019 11:13AM

setting an index for speed

698

Michael Peters

07/02/2019 04:56AM

Re: setting an index for speed

389

Peter Brawley

07/02/2019 12:29PM

Query optimization and indexing - Help needed

796

Pandit P

06/13/2019 06:41AM

Re: Query optimization and indexing - Help needed

389

Peter Brawley

06/13/2019 12:55PM

Re: Query optimization and indexing - Help needed

372

Pandit P

06/14/2019 12:01AM

Re: Query optimization and indexing - Help needed

397

Peter Brawley

06/14/2019 07:51AM

Is the query order guaranteed using Btree indexes and no ORDER BY

809

Ted Johnson

05/29/2019 02:12PM

Re: Is the query order guaranteed using Btree indexes and no ORDER BY

392

Peter Brawley

05/29/2019 03:00PM

Re: Is the query order guaranteed using Btree indexes and no ORDER BY

379

Ted Johnson

05/29/2019 04:41PM

CHECK constraints in MySQL

730

Edwin Desouza

05/14/2019 09:37AM

This topic has been moved.: optimizing searches using aggregate data in join

Matthew Lenz

10/21/2019 11:06AM

This topic has been moved.: setting an index for speed

Michael Peters

07/02/2019 12:26PM

This topic has been moved.: Slow Query

Deepak Nirmul

06/21/2019 10:18AM

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