Adding your database driver (MySQL and Oracle). The Confluence setup wizard will stop you at the Database configuration step if it can't find an appropriate Microsoft JDBC Driver for SQL Server download. We recommend that you use the bundled Type 4 JDBC driver. If you decide to use a later.
Indexes are separate data structures that provide alternate pathways to finding data. They can and do generally speed up the processing of queries and other DML commands, like the INSERT, UPDATE, REPLACE INTO, and DELETE statements. Indexes are also called fast access paths. In the scope of the InnoDB Database Engine, the MySQL database maintains the integrity of indexes after you create them. The upside of indexes is that they can improve SQL statement performance. The downside is that they impose overhead on every INSERT, UPDATE, REPLACE INTO, and DELETE statement, because the database maintains them by inserting, updating, or deleting items for each related change in the tables that the indexes support.
Indexes have two key properties—usability and visibility. Indexes are both usable and visible by default. That means they are visible to the MySQL cost-based optimizer and usable when statements run against the tables they support. You have the ability to make any index invisible, in which case queries and DML statements won’t use the index because they won’t see it. However, the cost-based optimizer still sees the index and maintains it with any DML statement change.
That means making an index invisible isn’t quite like making the index unusable or like dropping it temporarily. An invisible index becomes overhead and thus is typically a short-term solution to run a resource-intensive statement that behaves better without the index while avoiding the cost of rebuilding it after the statement runs.
It is also possible to make an index unusable, in which case it stops collecting information and becomes obsolete and the database drops its index segment. You rebuild the index when you change it back to a usable index. Indexes work on the principal of a key.
A key is typically a set of columns or expressions on which you can build an index, but it’s possible that a key can be a single column. An index based on a set of columns is a composite, or concatenated, index. Indexes can be unique or non-unique. You create a unique index anytime you constrain a column by assigning a primary key or unique constraint, but they’re indirect indexes.
You create a direct unique index on a single column with the following syntax against two non-unique columns. 1 2 3 4 CREATE UNIQUE INDEX commonlookupu1 ON commonlookup ( commonlookuptable, commonlookupcolumn, commonlookuptype ) USING BTREE; CREATE UNIQUE INDEX commonlookupu1 ON commonlookup ( commonlookuptable, commonlookupcolumn, commonlookuptype) USING BTREE; Most indexes use a B-tree (balanced tree). A B-tree is composed of three types of blocks—a root branch block for searching next-level blocks, branch blocks for searching other branch blocks, or and leaf blocks that store pointers to row values. B-trees are balanced because all leaf-blocks are at the same level, which means the length of search is the same to any element in the tree. All branch blocks store the minimum key prefix required to make branching decisions through the B-tree. Student questions are always interesting! They get me to think and to write.
The question this time is: “How do I write a script to process multiple MySQL script files?” This post builds the following model (courtesy of ) by using a bash shell script and MySQL script files, but there’s a disclaimer on this post. It shows both insecure and secure approaches and you should avoid the insecure ones. It seems a quick refresher on how to use arrays in bash shell may be helpful. While it’s essential in a Linux environment, it’s seems not everyone masters the bash shell. Especially, since I checked my Learning the Bash Shell (2 nd Edition) and found a typo on how you handle arrays in the bash shell, and it’s a mistake that could hang newbies up (on page 161).
Perhaps I should update my copy because I bought it in 1998. ? It was good then, and the new edition is probably better. The error is probably corrected in the current, but if not, the following examples show you how to use arrays in loops. Naturally, these do presume some knowledge of working with bash shell, like the first line always is the same in any bash shell script. That you open an if-statement with an if and close it with a fi, and that you else-if is elif; and that a semicolon between a for-statement and the do statement is required when they’re on the same line because they’re two statements. If you’re new to bash shell arrays, click on the link below to expand a brief tutorial.
It takes you through three progressive examples of working with bash arrays. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 - Use the sampledb database. USE sampledb; - Disable foreign key checking. SET foreignkeychecks = 0; - Drop an actor table. DROP TABLE IF EXISTS actor; - Create an actor table.
CREATE TABLE actor ( actorid INT UNSIGNED PRIMARY KEY AUTOINCREMENT, actorname VARCHAR ( 30 ) NOT NULL ); - Insert two rows. INSERT INTO actor (actorname ) VALUES ( 'Chris Hemsworth' ); INSERT INTO actor (actorname ) VALUES ( 'Chris Pine' ); INSERT INTO actor (actorname ) VALUES ( 'Chris Pratt' ); - Use the sampledb database. USE sampledb; - Disable foreign key checking. SET foreignkeychecks = 0; - Drop an actor table. DROP TABLE IF EXISTS actor; - Create an actor table. CREATE TABLE actor ( actorid INT UNSIGNED PRIMARY KEY AUTOINCREMENT, actorname VARCHAR(30) NOT NULL ); - Insert two rows.
INSERT INTO actor (actorname) VALUES ('Chris Hemsworth'); INSERT INTO actor (actorname) VALUES ('Chris Pine'); INSERT INTO actor (actorname) VALUES ('Chris Pratt'); The film.sql file. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 - Use the sampledb database. USE sampledb; - Disable foreign key checking. SET foreignkeychecks = 0; - Drop a film table. DROP TABLE IF EXISTS film; - Create a film table. CREATE TABLE film ( filmid INT UNSIGNED PRIMARY KEY AUTOINCREMENT, filmname VARCHAR ( 30 ) NOT NULL ); - Insert rows. INSERT INTO film (filmname ) VALUES ( 'Thor' ); INSERT INTO film (filmname ) VALUES ( 'Thor: The Dark World' ); INSERT INTO film (filmname ) VALUES ( 'Star Trek' ); INSERT INTO film (filmname ) VALUES ( 'Star Trek into Darkness' ); INSERT INTO film (filmname ) VALUES ( 'Guardians of the Galaxy' ); - Use the sampledb database.
USE sampledb; - Disable foreign key checking. SET foreignkeychecks = 0; - Drop a film table. DROP TABLE IF EXISTS film; - Create a film table. CREATE TABLE film ( filmid INT UNSIGNED PRIMARY KEY AUTOINCREMENT, filmname VARCHAR(30) NOT NULL ); - Insert rows. INSERT INTO film (filmname) VALUES ('Thor'); INSERT INTO film (filmname) VALUES ('Thor: The Dark World'); INSERT INTO film (filmname) VALUES ('Star Trek'); INSERT INTO film (filmname) VALUES ('Star Trek into Darkness'); INSERT INTO film (filmname) VALUES ('Guardians of the Galaxy'); The movie.sql file. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 - Use the sampledb database. USE sampledb; - Disable foreign key checking.
SET foreignkeychecks = 0; - Drop an movie table. DROP TABLE IF EXISTS movie; - Create an movie table. CREATE TABLE movie ( movieid int unsigned PRIMARY KEY AUTOINCREMENT, actorid int unsigned NOT NULL, filmid int unsigned NOT NULL, CONSTRAINT actorfk FOREIGN KEY (actorid ) REFERENCES actor (actorid ), CONSTRAINT filmfk FOREIGN KEY (filmid ) REFERENCES film (filmid ) ); - Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actorid, filmid ) VALUES ( ( SELECT actorid FROM actor WHERE actorname = 'Chris Hemsworth' ), ( SELECT filmid FROM film WHERE filmname = 'Thor' ) ); - Use scalar subqueries to discover surrogate keys by using the faux natural key.
INSERT INTO movie ( actorid, filmid ) VALUES ( ( SELECT actorid FROM actor WHERE actorname = 'Chris Hemsworth' ), ( SELECT filmid FROM film WHERE filmname = 'Thor: The Dark World' ) ); - Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actorid, filmid ) VALUES ( ( SELECT actorid FROM actor WHERE actorname = 'Chris Pine' ), ( SELECT filmid FROM film WHERE filmname = 'Star Trek' ) ); - Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actorid, filmid ) VALUES ( ( SELECT actorid FROM actor WHERE actorname = 'Chris Pine' ), ( SELECT filmid FROM film WHERE filmname = 'Star Trek into Darkness' ) ); - Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actorid, filmid ) VALUES ( ( SELECT actorid FROM actor WHERE actorname = 'Chris Pratt' ), ( SELECT filmid FROM film WHERE filmname = 'Guardians of the Galaxy' ) ); - Use the sampledb database. USE sampledb; - Disable foreign key checking.
SET foreignkeychecks = 0; - Drop an movie table. DROP TABLE IF EXISTS movie; - Create an movie table. CREATE TABLE movie ( movieid int unsigned PRIMARY KEY AUTOINCREMENT, actorid int unsigned NOT NULL, filmid int unsigned NOT NULL, CONSTRAINT actorfk FOREIGN KEY (actorid) REFERENCES actor (actorid), CONSTRAINT filmfk FOREIGN KEY (filmid) REFERENCES film(filmid)); - Use scalar subqueries to discover surrogate keys by using the faux natural key.
INSERT INTO movie ( actorid, filmid ) VALUES ((SELECT actorid FROM actor WHERE actorname = 'Chris Hemsworth'),(SELECT filmid FROM film WHERE filmname = 'Thor')); - Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actorid, filmid ) VALUES ((SELECT actorid FROM actor WHERE actorname = 'Chris Hemsworth'),(SELECT filmid FROM film WHERE filmname = 'Thor: The Dark World')); - Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actorid, filmid ) VALUES ((SELECT actorid FROM actor WHERE actorname = 'Chris Pine'),(SELECT filmid FROM film WHERE filmname = 'Star Trek')); - Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actorid, filmid ) VALUES ((SELECT actorid FROM actor WHERE actorname = 'Chris Pine'),(SELECT filmid FROM film WHERE filmname = 'Star Trek into Darkness')); - Use scalar subqueries to discover surrogate keys by using the faux natural key.
INSERT INTO movie ( actorid, filmid ) VALUES ((SELECT actorid FROM actor WHERE actorname = 'Chris Pratt'),(SELECT filmid FROM film WHERE filmname = 'Guardians of the Galaxy')); The following listmysql.sh shell script expects to receive the username, password, database and fully qualified path in that specific order. The script names are entered manually because this should be a unit test script.
Naturally, you can extend the script to manage those parameters but as mentioned I see this type of solution as a developer machine only script to simplify unit testing. Anything beyond that is risky! Username: Password: Database: Directory:./listmysql.sh: line 25: /actor.sql: No such file or directory./listmysql.sh: line 25: /film.sql: No such file or directory./listmysql.sh: line 25: /movie.sql: No such file or directory Username: Password: Database: Directory:./listmysql.sh: line 25: /actor.sql: No such file or directory./listmysql.sh: line 25: /film.sql: No such file or directory./listmysql.sh: line 25: /movie.sql: No such file or directory The secure way removes the password at a minimum! The refactored program will require you to manually enter the password for all elements of the array (three in this sample), and twice for the two queries. Here’s the refactored code. While I previously blogged about, some of my students would prefer to use the Eclipse IDE.
This post shows how to install and configure Eclipse IDE, include the mysql-connector-java.jar, and write Java to access the MySQL. You can download Eclipse IDE and then open it in Fedora’s Archive Manager. You can use the Archive Manager to Extract the Eclipse IDE to a directory of your choice. I opted to extract it into my student user’s home directory, which is /home/student. After extracting the Eclipse IDE, you can check the contents of the eclipse directory with the following command. 8 student student 4096 May 8 22: 16.
33 student student 4096 May 8 21: 57. 1 student student 119194 Mar 20 07: 10 artifacts.xml drwxrwxr-x. 11 student student 4096 May 8 22: 16 configuration drwxrwxr-x. 2 student student 4096 Mar 20 07: 10 dropins -rwxr-xr-x.
1 student student 78782 Mar 20 07:08 eclipse -rw-rw-r-. 1 student student 315 Mar 20 07: 10 eclipse.ini -rw-rw-r-. 1 student student 60 Mar 17 15: 11.eclipseproduct drwxrwxr-x. 41 student student 4096 Mar 20 07: 10 features -rwxr-xr-x. 1 student student 140566 Mar 20 07:08 icon.xpm drwxrwxr-x. 4 student student 4096 Mar 20 07:09 p2 drwxrwxr-x.
12 student student 40960 Mar 20 07: 10 plugins drwxrwxr-x. 2 student student 4096 Mar 20 07: 10 readme drwxrwxr-x. 8 student student 4096 May 8 22:16. 33 student student 4096 May 8 21:57.
1 student student 119194 Mar 20 07:10 artifacts.xml drwxrwxr-x. 11 student student 4096 May 8 22:16 configuration drwxrwxr-x. 2 student student 4096 Mar 20 07:10 dropins -rwxr-xr-x. 1 student student 78782 Mar 20 07:08 eclipse -rw-rw-r-. 1 student student 315 Mar 20 07:10 eclipse.ini -rw-rw-r-.
1 student student 60 Mar 17 15:11.eclipseproduct drwxrwxr-x. 41 student student 4096 Mar 20 07:10 features -rwxr-xr-x.
1 student student 140566 Mar 20 07:08 icon.xpm drwxrwxr-x. 4 student student 4096 Mar 20 07:09 p2 drwxrwxr-x. 12 student student 40960 Mar 20 07:10 plugins drwxrwxr-x. 2 student student 4096 Mar 20 07:10 readme You can launch the Eclipse IDE with the following command-line from the eclipse directory. # Set alias for Eclipse IDE tool.
Alias eclipse= '/home/student/eclipse/eclipse' # Set alias for Eclipse IDE tool. Alias eclipse='/home/student/eclipse/eclipse' The next time you start the student user account, you can launch the Eclipse IDE by entering eclipse in the search box opened by clicking on the Activities menu. The following steps take you through installing Eclipse on Fedora Linux, which is more or less the same as any Linux distribution.
It’s very similar on Windows platforms too. Eclipse Installation. Navigate to web page to download the current version of the Eclipse software. Click the Linux 32 Bit or Linux 64 Bit link, as required for your operating system.
Click the Green Arrow to download the Eclipse software. The next dialog gives you an option to open or save the software. Click the Open with radio button to open the archive file.
This the Linux Archive Manager. Click the Extract button from the menu tab to open the archive file.
![Mysql 5.6 Jdbc Driver For Mac Mysql 5.6 Jdbc Driver For Mac](/uploads/1/2/5/4/125466263/620873116.png)
This extract button on file chooser dialog to install Eclipse into the /home/student/eclipse directory. Click the Extract button to let the Archive Manager create a copy of those files. The Archive Manager presents a completion dialog. Click the Close button to close the Archive Manager. After installing the Eclipse software, you can configure Eclipse. There are sixteen steps to setup the Eclipse product. You can launch the product with the Eclipse Setup You need to launch the Eclipse application to perform the following steps.
The syntax is the following when you did create the alias mentioned earlier in the blog post. Eclipse & eclipse & The following steps cover setting up your workspace, project, and adding the MySQL JDBC Java archive. The branding dialog may display for 30 or more seconds before the Eclipse software application launches.
The Workspace Launcher opens first on a new installation. You need to designate a starting folder. I’m using /home/student/workspace as my Workspace.
Click the OK button when you enter a confirmed workspace. After setting the Workspace Launcher, you open to the Eclipse Welcome page.
Click second of the two icons on the left to open a working Eclipse environment. Alternatively, you can connect to Tutorials on the same page. From the developer view, click on the File menu option, the New option on the list, and the Java Project option on the floating menu. Eclipse will now create a new Java project. The New Java Project dialog lets you enter a project name and it also gives you the ability to set some basic configuration details. As a rule, you simply enter the Project Name and accept the defaults before clicking the Finish button.
After creating the new Java project, Eclipse returns you to the Welcome page. Click second of the two icons on the left to open a working Eclipse environment. Now you should see the working environment. Sometimes it takes the full screen but initially it doesn’t. Navigate to the lower right hand side, and expand the window to full size.
Now you should see the full screen view of the Eclipse working environment. Now you create a new Java class by navigating to the File menu options, then the New menu option, and finally choosing the Class floating menu. The New Java Class dialog requires you to provide some information about the Java object you’re creating.
The most important thing is the Java class name. The only difference in this copy of the New Java Class dialog is that I’ve entered HelloWorld as the Java Class’s name. Click the Finish button when you’re done. Eclipse should show you the following HelloWorld.java file.
It’s missing a main method. Add a static main method to the HelloWorld.java class source file. This form shows the changes to the HelloWorld.java file. Specifically, it adds the It’s missing a main method. Add a static main method to the HelloWorld.java class source file. You can click the green arrow from the tool panel or you can click the Run menu option and Run submenu choice to test your program.
Add MySQL JDBC Library The following instructions add the MySQL Library and demonstrate how to write Java programs that connect to the MySQL database. They also use the mysql project. Navigate to the Project menu and choose the Properties menu option.
The Properties menu option opens the Properties for the mysql project on the Order and Export tab. Click the Libraries tab to add an external library. In the Libraries tab click the Add Library button on the right to add an external library. In the JAR Selection dialog, click on Computer in the Places list, then click on usr, click on share, and click on java. The Name list should now include mysql-connector-java.jar file, and you should click on it before clicking on the OK button. You create new Java class file by clicking on the File menu. Then, you choose the New menu option and the Class menu option from the floating menu.
Enter MysqlConnector as the name of the new Java class file and click the Finish button to continue. Eclipse generates the shell of the MysqlConnector class as shown in the illustration to the left. You should replace the MysqlConnector class shell with the code below. Then, click the green arrow or the Run menu and Run menu option to compile and run the new MysqlConnector Java class file. Database connection established I Remember Mama, NR Tora! Planning out my year, I decided to take the Oracle OCP and MySQL OCP exams.
I checked for review books and was pleasantly surprised to find the soon to be released ). However, I noticed that the book was actually prepared for the obsolete and discountinued Exams 1Z0-870, 1Z0-873, and 1Z0-874.
As it turns out, Steve O’Hearn has informed me that there isn’t a book and that the posting in Amazon.com is in error. There isn’t an alternative review book for the OCP MySQL 5.6 Developer or Database Administrator Exams. The question that I have is simple: “How relevant is this book because it was prepared for the older exams?” There isn’t a table of content published on the site. If there was a table of contents it could help me determine how close the book’s content is to the new exam. As a preparation to figure out the value of the book as a study guide, I’ve reviewed the current Oracle MySQL Training Objectives (listed below). The new MySQL OCP Developer and Administrator exams have the following descriptions and objectives:.
Oracle provides the following outline for their MySQL for Developer (Ed 3) training course. Recent Posts. Things Written About Things Written About Pages. Blogroll.
Archives.
MySQL Connector/J MySQL provides connectivity for client applications developed in the Java programming language with MySQL Connector/J, a driver that implements the. MySQL Connector/J 8.0 is a JDBC Type 4 driver that is compatible with the specification.
The Type 4 designation means that the driver is a pure Java implementation of the MySQL protocol and does not rely on the MySQL client libraries. For detailed information please visit the official. Licensing Please refer to files README and LICENSE, available in this repository, and for further details. Download & Install MySQL Connector/J can be installed from pre-compiled packages that can be downloaded from the. Installing Connector/J only requires extracting the corresponding Jar file from the downloaded bundle and place it somewhere in the application's CLASSPATH. Alternatively you can setup directly in your project and let it download it for you. Building from sources This driver can also be complied and installed from the sources available in this repository.
Please refer to the documentation for on how to do it. GitHub Repository This repository contains the MySQL Connector/J source code as per latest released version. You should expect to see the same contents here and within the latest released Connector/J package, except for the pre-compiled Jar. Additional resources.
For more information about this and other MySQL products, please visit.