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1Z0-883 | MySQL 5.6 Database Administrator

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1Z0-883 - MySQL 5.6 Database Administrator - braindump

Vendor Oracle
Exam Number 1Z0-883
Exam Name MySQL 5.6 Database Administrator
Questions 100 Q & A
Recent Update December 11, 2018
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1Z0-883 exam Dumps Source : MySQL 5.6 Database Administrator

Test Code : 1Z0-883
Test Name : MySQL 5.6 Database Administrator
Vendor Name : Oracle
Q&A : 100 Real Questions

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Oracle Oracle MySQL 5.6 Database

regardless of lingering skepticism, Oracle troopers on with MySQL | killexams.com Real Questions and Pass4sure dumps

Oracle’s MySQL 5.6 building unencumber, introduced Monday, can also quell one of the concerns in regards to the enterprise’s funding within the open source database platform. however skepticism within the marketplace is probably going to proceed.

The building liberate for MySQL 5.6 comes simply just a few months after Oracle introduced the accepted availability of MySQL 5.5. although Oracle officials wouldn’t say precisely when MySQL 5.6 can be commonly available, the rule of thumb is eighteen to 24 months between releases. That facets to the second half of 2012 as a release goal for MySQL 5.6.

edition 5.6 includes enhancements to the InnoDB storage engine, an more suitable optimizer for more desirable query efficiency and more partitioning alternate options. it is attainable at the MySQL download web page.

MySQL, of route, was one of the crucial primary sticking aspects in Oracle’s acquisition of sun Microsystems final yr. solar had received MySQL AB now not long before then, and European regulatory officials have been involved that Oracle’s acquisition of an open supply database platform could cut back the database market. Oracle responded with some guarantees for MySQL, together with one to advance the open source edition of MySQL for as a minimum 5 years following the acquisition.

subsequently, Oracle has essentially split the construction of MySQL into two spheres: one is throughout the customary Public License (GPL), which is open supply, and the other is MySQL business version, a commercially licensed product with bells and whistles now not blanketed within the GPL edition.

For one conclusion consumer, a senior manager of database operations at a biotechnology company, MySQL items an opportunity to diminish licensing prices with the aid of moving whatever thing database workloads it can faraway from Oracle.

“We’ll all the time try to do MySQL each time we are able to because of the lower cost,” stated the supervisor, who asked that his id be withheld. “When someone comes to us with a database want, we try to flow them to MySQL. but on occasion in the multi-terabyte environments, we must go together with Oracle.”

One location the place the supervisor notion MySQL mandatory growth become in the area of sizzling backup, where systems are backed up without any downtime. He spoke of they looked at some third-celebration products to work with MySQL, but so far haven’t discovered anything else sufficient.

studies like these are not the ones Oracle wants to hear. The enterprise is as a substitute positioning MySQL as competitors to Microsoft SQL Server. That was evident satisfactory in a presentation Monday on the Collaborate convention in Orlando by means of Tomas Ulin, Oracle vice chairman of MySQL building, who put up a slide with a chart evaluating the costs of MySQL versus SQL Server. based on Oracle, the changes measures within the six figures per 12 months.

Oracle has also put effort in improving the MySQL Installer for home windows, Ulin stated, and in short, has delivered on its promises to invest in MySQL.

“we have released eight GA items (involving MySQL),” he observed. “this is the biggest number of GA releases that any one has completed in a 12 months with MySQL.”

Andrew Flower, president of the foreign Oracle users community, talked about that Oracle has done a great job on the technological side of MySQL.

“I’m not a MySQL professional, but people that are [say the] great of version 5.5 is impressive, so that was exquisite,” he talked about. however he brought that there have been some “communique challenges” as a result of the legal manner of the sun acquisition and some predisposed concern, uncertainty and doubt in the MySQL group of the acquisition.

“There turned into a vacuum of conversation where Oracle, and in selected those who owned the MySQL half, now not really communicating with the group all that well,” he pointed out.

however communication isn’t the handiest difficulty MySQL clients are concerned with when it comes to Oracle, according to Kaj Arno, the previous vice president of the MySQL community at MySQL AB after which solar. Arno observed he expects Oracle to proceed to improve the GPL edition of MySQL, if for no different motive than that reneging on its promises might hurt its recognition in future acquisitions. but Arno, who's now vp of items for SkySQL, a MySQL capabilities provider, spoke of there are open source tools within the MySQL ecosystem that commonly clash with Oracle’s personal products.

One example is ScaleDB, a storage engine commonly called the Oracle RAC of MySQL. ScaleDB become marketed closely when MySQL AB became on its own, however Arno doesn’t expect that to continue.

“it could be dull of Oracle to promote such a mixture,” he mentioned. “it would cannibalize what they’re presenting in the way of their personal options.”

Arno spoke of that stream by means of Oracle is likely within the hobbies of its personal shareholders, “however is probably contrary to the pastime of MySQL users.”


Oracle: MySQL And New Servers Will Reward traders This year | killexams.com Real Questions and Pass4sure dumps

No outcome found, are trying new keyword!moreover ramping up its product portfolio, Oracle has additionally upped the ante in utility as well. Its normal open source database MySQL simply launched MySQL 5.6 DMR. it is designed to enrich repli...

Oracle-solar: Whither MySQL? | killexams.com Real Questions and Pass4sure dumps

As traders and analysts digest this morning's Oracle-solar information, some are questioning what is going to ensue to solar-owned MySQL, and even if combining the Oracle and MySQL database groups would symbolize an antitrust subject.

schwartzGetty photographs

solar Microsystems CEO Jonathan Schwartz

while MySQL can be a small a part of Oracle's common company, or not it's a popular open-supply database that competes with different Oracle choices. The deal, writes in the hunt for Alpha's Mike Butcher, "has massive implications for the long run openness of Java and MySQL."

"MySQL is certainly a big prize for Oracle," writes Om Malik on GigaOm, who says that the acquisition takes out Oracle's No. 1 possibility. "As MySQL becomes more successful in pushing into the business, can Oracle executives withstand seeing the open-source database as a risk to its own high-performing, ready but more costly providing," asks Computerworld's Sharon Machlis.

Curt Monash speculates on the likelihood of an antitrust problem. "A merged Oracle/MySQL will dwarf the competition in ways that Oracle or MySQL on my own don’t," he writes.

"i will doubtless get a hold of business practices that may make issues very difficult on Oracle/MySQL rivals," he provides. " Oracle might evolve MySQL in a direction that makes it brilliant to put a MySQL transparency front end onto the Oracle DBMS. And in just a few really expert MySQL engines as they mature, and the entire issue could be a formidable family unit."

What do you feel should still turn up to MySQL?




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1Z0-883 exam Dumps Source : MySQL 5.6 Database Administrator

Test Code : 1Z0-883
Test Name : MySQL 5.6 Database Administrator
Vendor Name : Oracle
Q&A : 100 Real Questions

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MySQL 5.6 Database Administrator

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Global transaction IDs, full-text searches highlight MySQL 5.6 release | killexams.com real questions and Pass4sure dumps

Matt M. Casey, Contributor

After two years of development, Oracle Corp. has released its first all-in-house version of MySQL. The MySQL 5.6 release debuted in early February, and experts say it represents a significant (though not unmitigated) improvement over version 5.5.

"I think there's something for everybody in 5.6," said Sheeri Cabral, senior database administrator and architect for Mozilla Corp. "As soon as I finish upgrading all of my machines to 5.5, I'll upgrade to 5.6."

The upgraded explain function offers a big boost to experts dealing with legacy systems that tend to be buried in layers of workarounds.

The new version offers raw performance improvements in addition to a batch of new features that make Cabral and others happy.

MySQL 5.6 global transaction IDs

Global transaction IDs give each action within your MySQL database a unique identifying number recognized by all the machines within the system. This change, Cabral said, reduces a lot of work when it's time to take a master down for maintenance. Instead of the "very fiddly" process of syncing one slave to another, the new global transaction IDs allow you change host with a simple command. The MySQL 5.6 release framework will take over from there -- but only if you want it to. MySQL will simplify the transition by default, but administrators can still fiddle if they want to.

This change is so "revolutionary," Cabral said, that she can imagine people in just a few years talking about the "old days" of having to tinker with servers after a failure.

MySQL 5.6 performance, full-text searches

According to Oracle's notes, the MySQL 5.6 release represents an approximately 200% transaction-per-second increase over 5.5 under some conditions, and its improvements should shine brightest as administrators add more connections and CPU threads.

Giuseppe Maxia, who worked on the MySQL team in several capacities from 2006 to 2010 and now heads quality assurance for Continuent Inc., said most of his customers should see a speed increase simply by upgrading to 5.6 without any additional optimization. However, they shouldn't expect speeds as fast as those advertised.

"The improvement is huge," said Maxia. "It's not momentous. It's not revolutionary, but it's big."

While several MySQL watchers, including Peter Zaitsev at the MySQL Performance Blog, have shown that the MySQL 5.6 release is slower than 5.5 under some circumstances, Maxia said those claims are overblown. Observers draw those conclusions, he said, by analyzing very specific and unusual situations. Zaitsev himself wrote that his analysis came from a "worst-case scenario" of a 5.6 implementation.

Maxia and Cabral both said the new InnoDB full-text searches excited them. According to Oracle's DBA and Developer Guide to What's New in MySQL 5.6, the change allows administrators to "build full-text indexes on InnoDB tables" -- which, in turn, allows InnoDB to handle word- and phrase-based searches without having to move data outside of the table.

The immediate effect of this change, said Maxia and Cabral, is that administrators can jettison MyISAM tables. MyISAM -- which doesn't support transactions -- had been kept around primarily as a workaround for InnoDB's lack of full-text search and tended to make systems less stable. Now, Maxia said, he can tell any of his customers still using MyISAM to get rid of them and trade up for a safer, more robust environment that crashes less often.

"This will probably be, long term, the biggest improvement for searches," Maxia said.

Upgraded explain function, iffy integration

Version 5.6 also helps administrators better understand how transactions will snake through their database. The upgraded explain function can now be used in conjunction with "insert," "update," and "delete." The function kicks out a description of which tables the function will touch and how. As an additional bonus, the newly-improved explanations can be interpreted by outside JSON programs to create a visual representation of how and where a given query impacts a database.

While the feature might offer a little help to newly minted administrators, Maxia said that the feature offers a big boost to the experts dealing with legacy systems that tend to be buried in layers of workarounds.

Maxia said the new tools please him overall -- and he added that they should probably please everybody -- but he's concerned at how they might work together.

In addition to the new global transaction IDs, the MySQL 5.6 release allows for parallel updates on new multi-threaded slaves. Both are nice features, Maxia said, but he's found that administrators can only use one or the other. For administrators who use both, he said, "You can get the job done, but the job's not easier."


Percona Toolkit 2.2 for MySQL Now Supports MySQL 5.6 and Percona XtraDB Cluster | killexams.com real questions and Pass4sure dumps

PLEASANTON, CA--(Marketwire - Mar 25, 2013) - Percona, the company that makes MySQL faster and more reliable, today announced the availability of Percona Toolkit 2.2, the latest release of the company's open source administration tools for MySQL which also work with Percona Server, the drop-in replacement for MySQL. The new version adds support for Percona XtraDB Cluster and MySQL 5.6. Enhancements also make Percona Toolkit 2.2 more resilient and easier to use.

Percona Toolkit is a free, open source solution, which enables administrators to simply and reliably automate complex, tedious tasks to eliminate error-prone steps and avoid unintended consequences, such as increased system load. The tools distill the expertise that Percona has acquired through tens of thousands of hours of experience on mission-critical MySQL and Percona Server database servers. Percona Toolkit reduces operational costs by increasing staff productivity and helping to improve database performance and uptime. It is very useful for administrators of all MySQL servers and is especially useful for large, busy servers, such as web applications, enterprise systems, and gaming applications. Percona Toolkit 2.2 tools are developed by the Percona engineering team, which uses more than 4,000 unit and integration tests to ensure the highest quality and reliability.

Technical Highlights

  • Fully MySQL 5.6 compatible
  • Several tools have been significantly updated or rewritten to make them more powerful, simpler, and easier to use.
  • The resiliency of pt-online-schema-change has been greatly improved, especially for MySQL 5.5 and 5.6.
  • The tools provide a warning default option, using secure https protocol when possible, regarding out-of-date software and critical problems. The feature can be disabled if checks are not desired.  
  • pt-mysql-summary and pt-stalk now have built-in standard MySQL options.
  • pt-table-checksum now warns the user if no replicas are found.
  • Quotes

    Vadim Tkachenko, Co-founder and Chief Technology Officer, Percona "Percona Toolkit is an essential set of tools for MySQL for eliminating the common manual management errors that lead to poor performance and system crashes. By automating complex administrative tasks, these tools reduce operational costs and increase user productivity. With version 2.2, we have made several tools more powerful and easier to use and have added support for MySQL 5.6 and Percona XtraDB Cluster, making the toolkit even more valuable to administrators."

    About Percona

    Percona has made MySQL faster and more reliable for over 1,800 consulting and support customers worldwide since 2006. Percona provides enterprise-grade MySQL Support, Consulting, Training, Remote DBA, and Server Development services to companies such as Cisco Systems, Alcatel-Lucent, Groupon, and the BBC. Percona's founders authored the definitive book High Performance MySQL from O'Reilly Press and the widely read MySQL Performance Blog. Percona also develops software for MySQL users, including Percona Server, Percona XtraBackup, Percona XtraDB Cluster, and Percona Toolkit. The popular Percona Live conferences draw attendees and acclaimed speakers from around the world. For more information, visit www.percona.com.

    Percona® and XtraBackup® are registered trademarks of Percona LLC. All other registered and unregistered trademarks in this document are the sole property of their respective owners.


    How to speed up your MySQL with replication to in-memory database | killexams.com real questions and Pass4sure dumps

    Original article available at https://habrahabr.ru/company/mailru/blog/323870/

    I’d like to share with you an article based on my talk at Tarantool Meetup (the video is in Russian, though). It’s a short story of why Mamba, one of the biggest dating websites in the world and the largest one in Russia, started using Tarantool. Why did we decide to busy ourselves with MySQL-to-Tarantool replication?

    First, we had to migrate to MySQL 5.7 at some point, but this version didn’t have HandlerSocket that was being actively used on our MySQL 5.6 servers. We even contacted the Percona team — and they confirmed MySQL 5.6 is the last version to have HandlerSocket.

    Second, we gave Tarantool a try and were pleased with its performance. We compared it against Memcached as a key-value store and saw the speed double from 0.6 ms to 0.3 ms on the same hardware. In relative terms, Tarantool’s twice as fast as Memcached. In absolute terms, it’s not that cool, but still impressive.

    Third, we wanted to keep the whole existing architecture. There’s a MySQL master server and its slaves — we didn’t want to change anything in this structure. Can MySQL 5.6 slaves with HandlerSocket be replaced with something else without having to make significant architectural changes?

    We learned that the Mail.Ru Group team has a replicator they created for their own purposes. The idea of replicating data from MySQL to Tarantool belongs to them. We asked the team to share the source code, which they did. We had to rewrite the code, though, since it worked with MySQL 5.1 and Tarantool 1.5, not 1.7. The replicator uses libslave, an open-source solution for reading events from a MySQL master server, and is built statically without any of MySQL’s system libraries. It’s been open-sourced under the BSD license, so anyone can use it for free.

    Replication constraints

    Firstly, binary logs residing on a master must be row-based (STATEMENT and MIXED options won’t do, only ROW). Secondly, this replicator is not a Tarantool module, but a stand-alone daemon that doesn’t have anything to do with either Tarantool or MySQL. Thirdly, if you want a single master to have, say, ten slaves, you’ll have to run ten separate daemons, because one replicator can replicate data to only one Tarantool instance at a time. Lastly, the replicator won’t work with MariaDB. We tried it with versions 5.6 and 5.7, but they’re either an Oracle or a Percona build (which is what we use). MariaDB’s replication protocol has been changed.

    How does replication work?

    MySQL and Tarantool know nothing about each other. The replicator reads all the MySQL binary logs and writes the data to Tarantool.

    What can the replicator do?

    When the replicator is run, it grabs all the data from a master, based on the configuration file that specifies which databases/tables need to be replicated. That said, it takes just a Tarantool instance with empty spaces to launch the replicator — it’s very convenient.

    As a system administrator, you need to understand if the replication process is working, which binary log and which position value are being read at the moment. Of course, the replicator provides such functionality: there’s a separate Tarantool space that contains just three values, including the binary log name and the current position value — you may regard it as an analog to good old SHOW SLAVE STATUS.

    10.5.2.17:5000> box.space.ReplicationLog:select() [0, ‘db-bin.024218’, 916925355]

    After adopting the replicator, we deployed seven Tarantool instances running on only two servers, as a single Tarantool instance can’t use all the CPU cores of a machine at once. As a quick refresher of the Tarantool architecture, one instance is capable of using three cores or more: one core or more for network, strictly one core for transactions and strictly one core for handling write-ahead log (WAL) files.

    Workload

    After we ran the replicator, the workload on MySQL slaves with HandlerSocket dropped close to zero.

    Then we tried to remove seven out of eight MySQL slave servers, and the remaining one was able to withstand all the workload. We didn’t fully give up MySQL slave servers — we kept them for handling those requests that work without HandlerSocket, which means we can complete the migration to MySQL 5.7. In the end, we saved at least seven servers, a number of enterprise SSDs that power them, and some rack space, electricity and money.

    What about response time? We at Mamba have our own open-source product called BTP. Below are a couple of charts it generated.

    HandlerSocket has a very peculiar API. You need to first call connect, then open_index and, finally, execute. The chart above shows cumulative time for the three methods, which sometimes could be as high as one second.

    Compare it to what we got on Tarantool servers running the same database replicated from a MySQL master:

    The reason is quite simple: MySQL was running on SSDs, and the buffer pool size was less than that of the database. Tarantool, on the other hand, is an in-memory database, so all the data is RAM-resident. We even disabled WAL files on almost all the instances, so no disk operations are involved. However, there are several non-production instances used for snapshotting, where we kept WAL files enabled.

    Isn’t it reinventing the wheel?

    If someone else told me about all this, I’d say, “Aren’t you reinventing the wheel? You’re replicating something from MySQL to Tarantool. Sure, you’re thinking of dropping HandlerSocket in order to migrate to MySQL 5.7. But why would you do that in the first place? If your servers without HandlerSocket can’t handle the workload, just add some more servers. If you do need an in-memory database, you can create heap tables or move database files to tmpfs, create symlinks — and all the tables will be in RAM again. Bingo!”

    However, that’s not how it is.

    Here’s what so special about the replicator. Suppose the database that resides on a master and that we want to replicate contains about a hundred tables, but a slave doesn’t need all these tables — it needs only seven of them. We’d hate to spend extra resources on replicating surplus data. Luckily, MySQL allows specifying the number of tables to replicate. But what if these seven tables have 120 fields in total, whereas only 21 of them are actually used in queries handled by the slave servers? MySQL forces us to entirely replicate all the seven tables, which take up about 80 GB of RAM in our case. The replicator, on the other hand, allows specifying a subset of table fields for replication, bringing the volume down to 20 GB.

    What’s also great about the replicator is that all these table fields are put into one space, so you can select them with a single query, without using any joins.

    Results

    Tarantool is really fast, up to three times faster than MySQL, as attested by the charts above.

    The resulting implementation of Tarantool replication works faster than that in MySQL, and here’s why. When we first ran it, we couldn’t help asking ourselves if our replication is consistent. We created a simple PHP script that compares the number of monthly active users as reported by a MySQL master and a Tarantool slave. Sometimes the script grabbed even the users who registered less than a second ago. A MySQL slave didn’t have those users yet, whereas the Tarantool slave did, even though executing SHOW SLAVE STATUS on the MySQL slave always showed a zero delay. That said, the information reaches Tarantool faster, since it’s an in-memory database.

    Tarantool’s advantages

    What happens if you unplug a MySQL server power cable, then plug it back in and restart the server? At startup, the process of InnoDB recovery is launched, which consequently restores the database. But a couple of times we’ve seen the following situation: the controller starts writing some inadequate information to disk, the server throws a kernel panic due to the controller malfunction and InnoDB recovery following the restart ends with a core dump.

    Tarantool boasts a well-thought-out WAL mechanism: even if the controller does write some rubbish to a WAL file, which prevents you from relaunching Tarantool, you can simply delete this file. Or you could open it and delete records one by one until Tarantool is up and running again. As a side note, it’s possible to specify the number of transactions written to a WAL file at a time — it can even be a single transaction. I’d like to stress here that the MySQL example I used above involves a hardware (server) failure; normally, InnoDB recovery works like a charm.

    What I also like about Tarantool is that it’s very user-friendly. It’s always clear what to do and how to do it. Suppose a new MySQL version is out. You install it, but it won’t launch. After checking the error log, you discover some parameters in my.cnf are deprecated. Then you open the official documentation and see a bunch of new parameters, so you have to figure out how to create a new my.cnf file to boost the performance. Tarantool doesn’t have any of this. It’s easy to use, with an absolutely necessary minimum of parameters.

    Another thing we all enjoyed is the Tarantool community. There’s a Telegram chat (ping Denis Anikin for an invite), where you can ask the developers a question about Tarantool or get a quick bug fix.

    Tarantool’s snapshotting implementation is excellent. This mechanism works incredibly fast — 800 MB or, probably, even 1 GB per second. Everything is written consecutively to a single file. You don’t need high-end disks for that, the cheapest SATA drives are more than enough. Starting a snapshot of a 20 GB database takes under five minutes. According to my measurements, MySQL requires much more time for that.

    Tarantool’s disadvantages

    First and foremost, Tarantool indexes are case-sensitive, which is really inconvenient, especially if you come from the MySQL background.

    Second, working in the console isn’t that comfortable. Say, how do you know that MySQL replication is running? You execute SHOW SLAVE STATUS twice and see the numbers change. Moreover, the MySQL console will show you the output of SHOW SLAVE STATUS only once, even if you execute the command a hundred times.

    The Tarantool console, on the other hand, displays a separate output each time you hit Enter. As a result, it takes a lot of time to scroll back up to a place you need.

    Takeaway

    Tarantool is a really good product that you can use in your projects. It does have its drawbacks, but it’s constantly evolving. Now that it has data replication from MySQL, I hope it will grow even faster. Tarantool’s killer feature is, of course, its speed.

    Thank you and stay tuned!



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