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1Z0-882 MySQL 5.6 Developer

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1Z0-882 exam Dumps Source : MySQL 5.6 Developer

Test Code : 1Z0-882
Test appellation : MySQL 5.6 Developer
Vendor appellation : Oracle
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Oracle MySQL 5.6 Developer

MySQL 5.6 boasts superior precipitate | killexams.com real Questions and Pass4sure dumps

whereas the development world continues to live spellbound by using NoSQL revolutions, the decidedly SQL-based mostly MySQL hasn’t stood nevertheless. nowadays, Oracle announced the unlock of MySQL 5.6, which comprises a large number of speedups, and a brand novel hold on the NoSQL model in line with Memcached.

Tomas Ulin, vice president of MySQL engineering at Oracle, mentioned that there are a number of most necessary optimizations covered in 5.6. Queries should noiseless escape quicker for a lot of kinds of workloads, as an instance.

Ulin mentioned there may noiseless live “stronger question execution instances and more advantageous diagnostics. they savor sub-query optimizations. We’ve rewritten how they address sub-queries. There’s in reality no novel features there, simply quicker execution.”

these optimizations prolong down into InnoDB, as neatly, the site the MySQL team has brought index condition pushdown optimizations. These optimizations enable the MySQL server to hand off some records circumstances to the storage engine, allowing stated engine to in shape circumstances earlier than reading in a complete row of statistics. the consume of these optimizations, InnoDB (MySQL’s default storage engine) shouldn’t savor to conclude as many reads when doing a row retrieval.

in other places during this free up, Ulin mentioned loads of toil has been carried out to boost transparency when troubleshooting database issues. The team at Oracle, he spoke of, has added optimized traces and question execution plans. InnoDB has also been optimized, and thru this work, MySQL 5.6 can aid up to forty eight cores.

“we will now address a considerable deal more concurrent load devoid of getting congestion, which means they are able to scale out with extra cores,” spoke of Ulin. “we savor linear scalability to 48 cores on both read and write masses. The transactional throughput has stronger thrice in the scale-out condition of affairs. What this actually means is that MySQL can now utilize the contemporaneous hardware.”

InnoDB has additionally brought complete textual content search capabilities.

most likely essentially the most enjoyable novel addition to MySQL 5.6 is the inclusion of NoSQL-like capabilities, created throughout the addition of Memcached. “We introduced a yr in the past they savor been adding the Memcached API to access and update information in InnoDB,” said Ulin. “we will live a allotment of the better of both worlds within the SQL/NoSQL discussion. They suppose they can build it much more convenient to benefit the benefits of NoSQL-category access. They offer you a versatile, powerful language to fade through your data. We’ve observed as much as nine-times advancements the usage of the NoSQL interface.”


publication explores Oracle, MySQL question strategies | killexams.com real Questions and Pass4sure dumps

Michael McLaughlin’s Oracle 11g & MySQL 5.6 Developer guide  features out several techniques Oracle builders can build their lives more convenient. One chapter specializes in SQL querying and singles out some time-saving, speed-gaining hints, like the usage of keywords and utility development tools.

SearchOracle.com currently caught up with McLaughlin to discover greater about how knowledgeable consume of Oracle queries can improvement developers.

What are some common mistakes and complications that builders kisser when querying?

Michael McLaughlin: tolerable oversight are design considerations more than they're syntax error. SQL design considerations create queries that recrudesce inconsistent, mistaken or inefficient results. uncongenial or incorrect outcomes generally hold site as a result of live a allotment of circumstances fail to resolve a relationship or where clause circumstances fail to filter rows accurately.

Inefficient queries often count on inefficient joins that may also disable or consume needless indexes, or they may also count on correlated queries, the site the live allotment of commentary matches non-entertaining column values. A fix to the non-uniquely matched correlated queries is standard, since you consume a glance up operator just like the IN, =ANY or =SOME, bar nobody of which recrudesce results sooner for non-uniquely matched column values.

What are the benefits of key phrase consume when querying?

McLaughlin: key phrases cowl a few roles in SQL and are effective once they befriend developers visualize statistics or SQL syntax. key phrases equivalent to inner, LEFT, confiscate and whole live allotment of qualify the connection among tables and generally aid builders visualize which table gives what facts. for example, an inner live a allotment of or live a allotment of is the intersection of tables. It requires that you just determine the columns that assist the live a allotment of operation automatically following the observation. In ANSI 92, the where clause most effective includes statements that filter the recrudesce set on non-be a allotment of conditions. The older ANSI 89 vogue separates tables with commas and lets live a allotment of statements seem any site in the the site clause. The the site clause then incorporates live allotment of statements and filtering statements.

LEFT, privilege and entire link statements stand for you can duty outer joins. A LEFT live a allotment of takes everything on the left plus the intersection, which is commonly clearer than the older Oracle option of the usage of "+" symbols. it truly is as a result of LEFT or confiscate means that you can visualize the site the non-intersection data is determined. nevertheless, a "+" is save on the facet where there might not live any records backyard of the intersection. It only makes feel to a few builders in case you clarify set thought and mechanics and that makes it greater mathematical than valuable.

might you clarify the importance of table aliases and why builders should consume them?

McLaughlin: table aliases, like desk names, disambiguate identical-named columns when they're returned with the aid of a query. desk aliases often abridge the typing of long, descriptive names. they may live gauge if you chance to link copies of the identical tables since the table alias allows dissimilar copies of tables in a question.

What are the benefits and disadvantages of the consume of application development tools in comparison with the consume of the command-line interface?

McLaughlin: There are extra advantages to using utility edifice tackle than there are drawbacks. they are tremendous to prototype queries as well as insert, update and delete statements in isolation. They also let you package and escape script files. sooner or later, you occasionally should isolate an issue, and the command-line interface provides the naked bones of SQL interacting with the database. The command line is also the lingua franca (or, commonplace language) for SQL, which means that you may talk about SQL devoid of needing to instruct the consumer the route to consume a specific application construction tool. extra or much less, the command-line strategy to problems neutralizes the often incredible preferences for software development tackle amongst users.

What are two or three programming habits developers should adopt besides the fact that they may materialize like additional toil on the entrance end?

They should pick a style for writing SQL statements that permits them to sight read their code for punctuation and syntax compliance. It often means a bit more typing, however this may dramatically store time when trying to find a stray comma or key phrase. as an instance, an outstanding approach places commas on the left in elect and ORDER via clauses and ratiocinative AND/OR key words on the left of the where clause.

always consume table aliases, since it's easier so as to add content material with them than it's to retroactively add content material and desk aliases later to disambiguate very appellation columns. different recommendations involve always using the AS keyword before column aliases to assist clarify that the column identify is represented "as" the alias. which you could supervene indentation patterns on CASE statements.

Michael McLaughlin is a professor of desktop information know-how at Brigham adolescent college-Idaho and an Oracle ACE. He has worked for Oracle in consulting, guide and construction and is the writer of six books on Oracle technology.


Oracle publicizes MySQL conference and novel development Milestone unencumber of MySQL 5.6 | killexams.com real Questions and Pass4sure dumps

Apr 18, 2012

Oracle plans to dangle a MySQL convention on September 29 and 30, simply previous to Oracle OpenWorld 2012, which could live held in San Francisco from September 30 to October 4. The relish called MySQL link is planned to deliver an chance to live trained concerning the newest MySQL points, focus on product roadmaps, and attach directly with the engineers in the back of the newest MySQL code. 

MySQL link will consist of six tracks: performance and Scalability, high Availability, Cloud Computing, architecture and Design, Database Administration, and software construction, and feature technical periods, arms-on labs and birds of a feather (BOF) classes delivered via MySQL group individuals, clients, clients and MySQL engineers from Oracle.

"The IOUG's MySQL Council has been taking allotment with Oracle over the final 12 months on the route to enrich the MySQL group. To savor their own two-day, MySQL-concentrated event, together with this 12 months's Oracle OpenWorld, is a testament to Oracle's dedication to hearken to, aid and foster the MySQL community," says Sarah Novotny, chairperson, IOUG MySQL Council.

The claim papers is now open and MySQL users and neighborhood members are inspired to post session proposals. 

In different MySQL news, Oracle has introduced a brand novel development Milestone liberate (DMR) for MySQL 5.6. accessible for down load in the MySQL Developer Zone, the MySQL 5.6 DMR gives novel replication points enhancing availability with self-curative recuperation, increased efficiency, and improved manageability.

Oracle is also offering early access to points below edifice for neighborhood checking out and feedback via http://labs.mysql.com. The elements beneath edifice encompass on-line operations for ADD index and NoSQL access to InnoDB via the Memcached protocol. 


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MySQL 5.6 Developer

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Latest MySQL Community Server 8.0.12 Version Comes with Sub-Query Optimization | killexams.com real questions and Pass4sure dumps

Press Release Summary:

The MySQL Community Server 8.0.12 version enables user to understand queries development and swift solution, replication improvisation and supple NoSQL access. This version is suitable for 5.5, 5.6, 5.7 and 8.0 MySQL server versions and offers back to connectivity of Java Database. It consists of self healing replication clusters, global action identifiers and utilities that makes facile to automatic detector from failures.

Original Press Release: Unisecure Data Centers Offers MySQL Community Server 8.0.12 version with Web-Hosting

Unisecure Data Centers has announced availability of MySQL Community Server 8.0.12 version with Web-Hosting to helps user's for web application requirements with superior scalability, reliability, manageability and performance.

Philadelphia, US, 28th August 2018 | Unisecure Data Centers based in USA ready to deliver database services with MySQL Community Server 8.0.12 version to achieve high volume toil load to optimize for latest advance hardware. This products toil with less space with low charge and hence provide superior ROI (Return on Investment).

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Benchmarking Aurora vs MySQL: Is Amazon’s DB Really 5x Faster? | killexams.com real questions and Pass4sure dumps

In this post we’re taking a closer notice at Amazon Aurora to descry how it fares against MySQL and if it delivers on the plight of a 5x performance boost. Recently reaching general availability, Aurora is Amazon’s home grown MySQL compatible database. Currently available on three AWS regions (Virginia, Oregon and Ireland) on top of RDS, Amazon’s Relational Database Service.

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Aurora is basically the next stage in the evolution of Amazon’s hosted services. If now we’re used to using EC2 for their servers, and RDS was introduced for optimized database instances, Aurora is the next step in this offering. Fully compatible with any operation you’d escape through MySQL so no code changes are needed.

To descry a previous precipitate test they ran and discover how each of the regions compare to each other, you can check out this blog post privilege here.

Why Amazon is edifice a novel MySQL compliant database?

Unlike hosting a database on RDS, where they have additional performance benefits over EC2, monitoring, and quick installation features, Aurora even has some newer tricks up its sleeve. Seems like a novel database was required to build it easier for Amazon to further optimize performance and add features like backups and autoscaling database storage – Which is not available on the basic MySQL instances. In that sense, we’re promised that Aurora would act like MySQL if it was optimized to escape on AWS from day 1.

A side effect of this makes Aurora available only on AWS. So for example, you’d not live able to consume a local version for testing and would savor to completely reliance on AWS instances. On the lustrous side, migrating to Aurora from an existing database instance is just a matter of a few clicks.

Benchmark Results

To savor more of a hands on feel of how Aurora stands up to MySQL performance-wise we’ve set up a simple benchmark covering a write-heavy scenario using sysbench. To conclude this, we’ve used a similar configuration from a previous Aurora performance assessment ran by Amazon. In this version of the benchmark, they ran 4 different instances: The latest MySQL 5.6 on EC2 and on RDS, Aurora on RDS, and the release candidate version of the upcoming MySQL 5.7 on EC2. The exact setup they used and the raw results are available on the next section of this post. Let’s jump straight ahead and savor a notice at the findings:

Operations Per Second

Operations Per Second

Comparing operations per second for MySQL and Aurora on EC2 and RDS

1. MySQL 5.6 was 8% faster than Aurora – The novel database didn’t provide the best results on this test, and far off from the 5x plight we’re used to hear from Amazon. Perhaps the biggest differences kick in on different setups with bigger DB sizes, but this just comes to expose us the importance of trying it out with your specific consume case.

2. RDS provides up to a 60% performance benefit over EC2 – A more significant distinction is seen when they compare performance of databases on EC2 vs RDS. Using RDS provided considerable improvement over deploying the very database on EC2.

3. MySQL 5.7 RC provided slightly better results than MySQL 5.6 – The next version of MySQL shows some progress, even though the RC benchmark escape contained a considerable amount of ignored errors (full results are available through the link below).

4. When taking 95th percentile response times into account, Aurora takes the lead – Aurora was 20% better than MySQL 5.6 on RDS, and MySQL 5.7 was 20% better than MySQL 5.6 on EC2. RDS performed about 3x better than EC2.

** [Edit] please note that optimizing MySQL’s my.cnf configuration would savor probably improved its results. Thanks @morgo!

Response Times

Response time

Comparing 95h percentile response times for MySQL and Aurora on EC2 and RDS

The Groundwork

The benchmark included setting up 5 r3.large instances on AWS: An EC2 machine which will escape the benchmark, and machines with the databases themselves. MySQL 5.6 on EC2, MySQL 5.7 RC on EC2, MySQL 5.6 on RDS and Aurora which is only available on RDS. Then, we’ve created a test database with 250 tables and a 25,000 table size on each of the tested machines:

./sysbench –test=tests/db/oltp.lua –mysql-host= –mysql-port=3306 –mysql-user= –mysqlpassword= –mysql-db= –mysql-table-engine=innodb — oltp-table-size=25000 –oltp-tables-count=250 –db-driver=mysql prepare

Afterwards we’ve ran a variation of Amazon’s write-heavy benchmark described here (300 sec instead of 600 and 125 threads instead of 1000):

./sysbench –test=tests/db/oltp.lua –mysql-host= –oltp-tables-count=250 –mysql-user= –mysqlpassword= –mysql-port=3306 –db-driver=mysql –oltp-tablesize=25000 –mysql-db= –max-requests=0 –max-time=300 — oltp_simple_ranges=0 –oltp-distinct-ranges=0 –oltp-sum-ranges=0 –oltporder-ranges=0 –oltp-point-selects=0 –num-threads=125 –randtype=uniform run

So basically, the benchmark had 5 minutes to pitch bar nobody it’s got at each of the database instances, and report back on the results. The raw sysbench output is available privilege here:

– MySQL 5.6 on EC2– MySQL 5.7 RC on EC2– MySQL 5.6 on RDS– Aurora on RDS

Final Thoughts

As far as managed services go, Aurora is definitely a step in the privilege direction. Taking on hosted solutions for databases to the next level. But was it really necessary to create a novel database to back autoscaling? We feel that RDS proved that it’s the privilege route to fade as far as hosted MySQL goes and it’s a superior time to experiment with Aurora if you’re containing it to specific cases for testing in production. like with any novel technology that gets so nigh to the data at the core of your business, you’ll exigency to proceed with caution. With that said, a main pain point they didn’t address here is pricing and this is where Aurora holds the greatest plight against traditional complete blown commercial databases. 

Java / Scala developer? Takipi replaces logging in production JVMs and lets you descry the variable condition that caused each log oversight and exception.

Topics:

auora ,mysql ,benchmark ,databases


Use an updated_at Column in Your MySQL Table (and build it update automatically) | killexams.com real questions and Pass4sure dumps

Nothing is worse than trying to device out what went wrong with application data and finding out your tables don’t savor created_at or updated_at columns to store when rows are inserted or updated.

RAGE DROP TABLE TABLE_NAME

Another benefit you earn from having an updated_at column is efficient data replication into systems like Pipeline, one of their products at RJMetrics. If they know which rows savor been updated recently, they can sort by that column and forestall redundant queries.

Don’t reliance on properly formed queries to populate these columns! Let the database conclude it. Unfortunately, not bar nobody back it. Here’s how to build an automatically updating created_at timestamp in MySQL 5.5.

CREATE TABLE orders(id INT NOT NULL AUTO_INCREMENT,user_id INT NULL,amount FLOAT NULL,updated_at TIMESTAMP NOT NULL DEFAULT NOW() ON UPDATE NOW(),created_at TIMESTAMP NOT NULL, PRIMARY KEY(id));Query OK, 0 rows affected (0.00 sec)

So now your table has been created. The necessary allotment is the “updated_at TIMESTAMP NOT NULL DEFAULT NOW() ON UPDATE NOW()”This ensures that when novel rows are added, the default value is NOW() and then it updates again on every update to that row.

Let’s insert a few rows.

INSERT INTO orders (user_id, amount, created_at) VALUES (1,101.45,NOW());Query OK, 1 row affected (0.00 sec) INSERT INTO orders (user_id, amount, created_at) VALUES (1,45.32,NOW());Query OK, 1 row affected (0.00 sec)

INSERT INTO orders (user_id, amount, created_at) VALUES (2,12.00,NOW());Query OK, 1 row affected (0.01 sec)

SELECT * FROM orders;+----+---------+--------+---------------------+---------------------| id | user_id | amount | created_at | updated_at +----+---------+--------+---------------------+---------------------| 1 | 1 | 101.45 | 2016-05-04 15:59:21 | 2016-05-04 15:59:21 | 2 | 1 | 45.32 | 2016-05-04 15:59:21 | 2016-05-04 15:59:21 | 3 | 2 | 12 | 2016-05-04 15:59:22 | 2016-05-04 15:59:22 +----+---------+--------+---------------------+---------------------3 rows in set (0.00 sec)

And now we’ll build an update to the third row.

UPDATE orders SET amount = 120.00 WHERE id = 3;Query OK, 1 row affected (0.01 sec)Rows matched: 1 Changed: 1 Warnings: 0

SELECT * FROM orders;+----+---------+--------+---------------------+---------------------| id | user_id | amount | created_at | updated_at +----+---------+--------+---------------------+---------------------| 1 | 1 | 101.45 | 2016-05-04 15:59:21 | 2016-05-04 15:59:21 | 2 | 1 | 45.32 | 2016-05-04 15:59:21 | 2016-05-04 15:59:21 | 3 | 2 | 120 | 2016-05-04 15:59:22 | 2016-05-04 16:00:07 +----+---------+--------+---------------------+---------------------3 rows in set (0.00 sec)

So even though they didn’t build a change to the updated_at column in their UPDATE statement, MySQL knew to update it. The superior word is that in MySQL 5.6 you can savor the database ply both columns.

CREATE TABLE orders(id INT NOT NULL AUTO_INCREMENT,user_id INT NULL,amount FLOAT NULL,created_at TIMESTAMP NOT NULL DEFAULT NOW(),updated_at TIMESTAMP NOT NULL DEFAULT NOW() ON UPDATE now(),PRIMARY KEY(id));Query OK, 0 rows affected (0.02 sec)

Don’t reliance on developers to craft proper values for INSERT and UPDATE statements. Let MySQL conclude the work.

INSERT INTO orders (user_id, amount) VALUES (1,101.45);Query OK, 1 row affected (0.00 sec)

INSERT INTO orders (user_id, amount) VALUES (1,45.32);Query OK, 1 row affected (0.01 sec)

INSERT INTO orders (user_id, amount) VALUES (2,12.00);Query OK, 1 row affected (0.00 sec)

UPDATE orders SET amount = 120.00 WHERE id = 3;Query OK, 1 row affected (0.00 sec)Rows matched: 1 Changed: 1 Warnings: 0

SELECT * FROM orders;+----+---------+--------+---------------------+---------------------| id | user_id | amount | created_at | updated_at +----+---------+--------+---------------------+---------------------| 1 | 1 | 101.45 | 2016-05-04 17:30:19 | 2016-05-04 17:30:19 | 2 | 1 | 45.32 | 2016-05-04 17:30:19 | 2016-05-04 17:30:19 | 3 | 2 | 120 | 2016-05-04 17:30:19 | 2016-05-04 17:30:27 +----+---------+--------+---------------------+---------------------3 rows in set (0.00 sec)

Fascinating

Awesome, right? But what if you’re stuck on MySQL 5.5 and you absolutely exigency this? My colleague, Buck Ryan, sent me this excellent trigger to build that work, too.

CREATE TRIGGER orders__before_insertBEFORE INSERT ON ordersFOR EACH ROW SET NEW.created_at = NOW(), NEW.updated_at = NOW();

CREATE TRIGGER orders__before_updateBEFORE UPDATE ON ordersFOR EACH ROW SET NEW.created_at = OLD.created_at, NEW.updated_at = NOW();



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