mysql and how joomla uses it - meetupfiles.meetup.com/787901/joomla_mysql_16x9.pdf · mysql and how...

MySQL And How Joomla Uses It

Bruce Moore, DEng

Moore Software Services, LLCP.O. Box 183

Coppell, TX 75019(972) 652-0254

[email protected]

www.mooresoftwareservices.com

S i m p l i f y i n g F i n a n c i a l D at a A n a l y s i s

August 11, 2015

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

There are several important notes before we start

Before connecting to the database, create a back up

This lecture won’t talk about commands for inserting, updating anddeleting data

You can mess things up beyond your ability to recoverWill not fit in one hour

Assumes that you have shell access to your web site

Won’t cover configuration that requires root access to server

Won’t cover GUI utilities that require port 3306 to be open

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Akeeba Backup will backup MySQL database and flat files andshould be used before accessing tables

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Akeeba Admin Tools has tool for running table statistics andoptimizing tables. Do this regularly to improve response time.

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Use the Joomla Global Configuration panel to get the databasename, user ID, and table prefix

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Use the ’mysql -u username’ command to connect to thedatabase

[a@b ~]$ mysql -u username -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 111939

Server version: 5.5.42-cll MySQL Community Server (GPL)

.

.

.

Type ’help;’ or ’\h’ for help. Type ’\c’ to clear the current input statement.

mysql>

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Use the MySQL command ’list databases’ to find out the nameof the databases

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| username_joomla3 |

+--------------------+

2 rows in set (0.03 sec)

mysql> use username_joomla3;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Use the SQL statement ’create user’ to create a non-admin userID

mysql> create user ’noadmin’@’localhost’ identified by ’strong_password’;

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Use the MySQL command ’show tables’ to find out what tablesare in the database

’abcde’ is where Joomla puts the random prefix to make it harder for attackersto do SQL injection attacks.

mysql> show tables;

+-----------------------------------+

| Tables_in_username_joomla3 |

+-----------------------------------+

| abcde_assets |

| abcde_associations |

| abcde_categories |

| abcde_contact_details |

| abcde_content |

| abcde_content_frontpage |

| abcde_content_rating |

| abcde_content_types |

| abcde_menu |

| abcde_menu_types |

+-----------------------------------+


MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

A SELECT statement with a calculation will give the hits perday

mysql> select substr(title,1,50),hits/(to_days(now()) - to_days(created))

as hit_rate from edcba_content order by 2 desc;

+----------------------------------------------------+----------+

| substr(title,1,50) | hit_rate |

+----------------------------------------------------+----------+

| Social-buttons.com Referral Spam | 87.4326 |

| 100dollars-seo.com Referral Spam | 58.6393 |

| Stopping Rachel from Cardholder Services | 17.2479 |

| Videos-for-your-business.com Google Analytics Refe | 14.7500 |

| Success-seo.com Referral Spam | 14.0000 |

| Sales and Lead Management with SuiteCRM | 13.7710 |

| Effective Interest (Yield) Loan Fee Amortization | 13.7235 |

| Email Security Part 1: Verifying an Email Sender’ | 13.7163 |

...

+----------------------------------------------------+----------+

63 rows in set (0.00 sec)MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Use an SQL statement to find the articles that use MathJax

mysql> select title from edcba_content where edcba_content.introtext

like ’%mathjax%’;

+-------------------------------------------------------------+

| title |

+-------------------------------------------------------------+

| Calculating the Marginal Cost of Funds for Deposit Pricing |

| Effective Interest (Yield) Loan Fee Amortization |

| Configuring Server Side Page Caching in Joomla |

| Effective Interest (Yield) Loan Discount Points Application |

| Estimating the Cost of Funds for Loan Pricing |

| Opting Out of Browser Tracking |

+-------------------------------------------------------------+


MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Use an SQL statement to find all articles that reference a script

mysql> select title from edcba_content where edcba_content.introtext

like ’%<script%’;

+-------------------------------------------------------------+

| title |

+-------------------------------------------------------------+

| About |

| Contact |

| Calculating the Marginal Cost of Funds for Deposit Pricing |

| Effective Interest (Yield) Loan Fee Amortization |

| Estimating the Cost of Funds for Loan Pricing |

| Social-buttons.com Referral Spam |

...

+-------------------------------------------------------------+


MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Use an SQL statement to find out what Joomla tags are mostfrequently used.

mysql> select title,hits from edcba_tags order by hits desc;

+----------------------------+------+

| title | hits |

+----------------------------+------+

| Security | 669 |

| Loans | 651 |

| Open Source | 627 |

| Amortization | 585 |

| Yield | 582 |

| Marginal Cost | 556 |

| Email | 550 |

...

+----------------------------+------+


MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Use the MySQL ’show databases’ and ’use information schema’commands to look at the database catalog tables

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| username_joomla3 |

+--------------------+


mysql> use information_schema;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

To find out the number of rows in a table use an SQL statement

mysql> select table_name,table_rows from tables

where table_name like ’edcba%’ order by table_rows desc;

+-----------------------------------+------------+

| table_name | table_rows |

+-----------------------------------+------------+

| edcba_sh404sef_urls | 2275 |

| edcba_redirect_links | 1723 |

| edcba_finder_links_terms3 | 1301 |

| edcba_sh404sef_aliases | 820 |

| edcba_content | 31 |

| edcba_tags | 27 |

...

+-----------------------------------+------------+


MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

But we know that there are more than 60 articles in thecontent table...why only 31 here?

The number of rows is populated when you run statistics on a table; this isused to determine the access path.

The indexes and access path will change based upon table statistics

Old statistics may cause poor performance.

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Akeeba Admin Tools has a tool for running table statistics andoptimizing tables

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

You can also use MySQL commands to optimize all tables in aninstallation

mysqlcheck -u username -p -o --all-databases

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Use a SELECT statement to look at the row counts

mysql> select table_name,table_rows from tables

where table_name like ’edcba%’

order by table_rows desc;

+-----------------------------------+------------+

| table_name | table_rows |

+-----------------------------------+------------+

| edcba_sh404sef_urls | 2275 |

| edcba_redirect_links | 2128 |

| edcba_finder_links_terms3 | 1123 |

| edcba_sh404sef_aliases | 820 |

| edcba_content | 54 |

| edcba_tags | 49 |

...

+-----------------------------------+------------+

100 rows in set (0.56 sec)MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

The query cache statistics are available through ’show status’

mysql> show status like ’qcache%’;

+-------------------------+----------+

| Variable_name | Value |

+-------------------------+----------+

| Qcache_free_blocks | 1135 |

| Qcache_free_memory | 28564064 |

| Qcache_hits | 1125029 |

| Qcache_inserts | 314387 |

| Qcache_lowmem_prunes | 37134 |

| Qcache_not_cached | 63037 |

| Qcache_queries_in_cache | 1160 |

| Qcache_total_blocks | 3698 |

+-------------------------+----------+


MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Akeeba Backup will backup MySQL database and flat files andshould be used before accessing tables

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

The mysqldump command creates a file with all of the SQLneeded to recreate the database

[a@b ~]$ mysqldump -u username_joomla -p --all-databases > mysqldump_2015_08_10.dmp

Enter password:

[a@b ~]$ ls -lh *.dmp

-rw-rw-r-- 1 username username 57M Aug 10 12:17 mysqldump_2015_08_10.dmp

[a@b ~]$ gzip *.dmp

[a@b ~]$ ls -lh *.dmp.gz

-rw-rw-r-- 1 username username 18M Aug 10 12:17 mysqldump_2015_08_10.dmp.gz

[a@b ~]$

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

InnoDB is newer and has better performance in manysituations, but uses much more memory

MyISAM is the default engine

InnoDB is newer, has more granular locking and is frequently faster thanMyISAM but uses much more memory

MEMORY is not recoverable...used only for fast access

Some extensions have a lot of rows

Joomla ’finder’ function is new search toolSh404sef extension can have many rows to handle multiple URLs

MySQL Bruce Moore

MySQL

BruceMoore

Housekeeping

AkeebaUtilities

SQLQueries

Backup

Engines

Contact information

Bruce Moore, [email protected](972) 652-0254

MySQL Bruce Moore

mysql and how joomla uses it - meetupfiles.meetup.com/787901/joomla_mysql_16x9.pdf · mysql and how...

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