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In September 2018, IBM introduced a modern product, IBM Db2 AI for z/OS. This synthetic intelligence engine monitors statistics entry patterns from executing SQL statements, uses computing device discovering algorithms to resolve upon most fulfilling patterns and passes this counsel to the Db2 query optimizer for utilize by means of subsequent statements.laptop getting to know on the IBM z Platform
In may moreover of 2018, IBM announced version 1.2 of its machine gaining scholarship of for z/OS (MLz) product. here's a hybrid zServer and cloud software suite that ingests efficiency data, analyzes and builds models that symbolize the fitness repute of various indications, monitors them over time and provides true-time scoring capabilities.
a few elements of this product providing are aimed at assisting a community of model builders and managers. for instance:
This machine getting to know suite become at first geared toward zServer-based analytics functions. one of the first obvious choices become zSystem efficiency monitoring and tuning. tackle management Facility (SMF) data that are instantly generated by the working tackle supply the raw statistics for tackle aid consumption comparable to critical processor usage, I/O processing, reminiscence paging and so on. IBM MLz can assemble and store these records over time, and build and train models of device behavior, ranking those behaviors, determine patterns no longer effortlessly foreseen by means of people, multiply key efficiency warning signs (KPIs) and then feed the mannequin outcomes returned into the device to maintain an sequel on system configuration changes that can enrich performance.
The next step was to implement this suite to dissect Db2 efficiency statistics. One solution, called the IBM Db2 IT Operational Analytics (Db2 ITOA) retort template, applies the computing device studying know-how to Db2 operational data to gain an realizing of Db2 subsystem fitness. it might dynamically build baselines for key performance symptoms, supply a dashboard of these KPIs and provides operational personnel true-time insight into Db2 operations.
while regularly occurring Db2 subsystem efficiency is a vital ingredient in typical utility health and performance, IBM estimates that the DBA aid cadaver of workers spends 25% or greater of its time, " ... fighting access route issues which reason efficiency degradation and service maintain an sequel on.". (See Reference 1).AI involves Db2
agree with the plight of modern DBAs in a Db2 ambiance. In trendy IT world they maintain to assist one or extra expansive data purposes, cloud application and database services, utility setting up and configuration, Db2 subsystem and application performance tuning, database definition and administration, catastrophe healing planning, and greater. question tuning has been in being due to the fact the origins of the database, and DBAs are continually tasked with this as neatly.
The coronary heart of query route analysis in Db2 is the Optimizer. It accepts SQL statements from applications, verifies authority to access the statistics, reviews the places of the objects to exist accessed and develops an inventory of candidate information entry paths. These entry paths can comprise indexes, table scans, numerous table exist share of strategies and others. within the records warehouse and massive records environments there are usually further selections attainable. One of those is the being of summary tables (now and again called materialized query tables) that comprise pre-summarized or aggregated information, for that reason enabling Db2 to maintain away from re-aggregation processing. a different option is the starjoin entry path, typical in the data warehouse, where the order of desk joins is changed for efficiency explanations.
The Optimizer then studies the candidate access paths and chooses the access path, "with the bottom can charge." cost in this context means a weighted summation of resource usage including CPU, I/O, remembrance and other substances. ultimately, the Optimizer takes the lowest impregnate access route, retailers it in remembrance (and, optionally, in the Db2 listing) and begins access direction execution.
massive statistics and records warehouse operations now encompass software suites that enable the commerce analyst to utilize a graphical interface to build and maneuver a miniature facts mannequin of the facts they requisite to analyze. The applications then generate SQL statements according to the clients’ requests.
The issue for the DBA
so as to sequel respectable analytics for your numerous information shops you want a superb figuring out of the statistics requirements, an realizing of the analytical functions and algorithms attainable and a excessive-performance records infrastructure. regrettably, the quantity and placement of statistics sources is increasing (both in dimension and in geography), records sizes are transforming into, and purposes proceed to proliferate in number and complexity. How should still IT managers usher this ambiance, exceptionally with probably the most experienced and develope cadaver of workers nearing retirement?
be mindful additionally that a large share of reducing the plenary can impregnate of ownership of those methods is to procure Db2 purposes to rush sooner and greater efficaciously. This constantly translates into using fewer CPU cycles, doing fewer I/Os and transporting less statistics across the community. because it's often tricky to even identify which applications could profit from performance tuning, one manner is to automate the detection and correction of tuning concerns. here's the residence computer discovering and synthetic intelligence will moreover exist used to terrific impact.Db2 12 for z/OS and synthetic Intelligence
Db2 edition 12 on z/OS makes utilize of the computing device gaining scholarship of amenities mentioned above to collect and store SQL query textual content and entry route details, as well as precise efficiency-related ancient information such as CPU time used, elapsed instances and influence set sizes. This offering, described as Db2 AI for z/OS, analyzes and outlets the information in computer learning models, with the mannequin analysis consequences then being scored and made purchasable to the Db2 Optimizer. The subsequent time a scored SQL observation is encountered, the Optimizer can then utilize the mannequin scoring information as enter to its access path option algorithm.
The sequel should exist a reduction in CPU consumption because the Optimizer makes utilize of mannequin scoring input to select improved entry paths. This then lowers CPU prices and speeds application response instances. a significant competencies is that the utilize of AI utility does not require the DBA to maintain statistics science scholarship or deep insights into question tuning methodologies. The Optimizer now chooses the premiere entry paths based mostly now not best on SQL query syntax and information distribution statistics however on modelled and scored historic performance.
This may moreover exist specifically primary if you maintain information in assorted locations. as an example, many analytical queries in opposition t expansive statistics require concurrent access to determined statistics warehouse tables. These tables are often referred to as dimension tables, and they accommodate the facts features usually used to wield subsetting and aggregation. for instance, in a retail environment accept as proper with a table known as StoreLocation that enumerates each rescue and its location code. Queries towards maintain sales records might moreover want to aggregate or summarize income by using location; hence, the StoreLocation desk might exist used by way of some large data queries. during this atmosphere it's typical to win the dimension tables and copy them always to the expansive statistics application. in the IBM world this region is the IBM Db2 Analytics Accelerator (IDAA).
Now deem about SQL queries from each operational purposes, data warehouse clients and large statistics commerce analysts. From Db2's standpoint, utter these queries are equal, and are forwarded to the Optimizer. youngsters, within the case of operational queries and warehouse queries they should still certainly exist directed to entry the StoreLocation table within the warehouse. on the other hand, the query from the company analyst in opposition t huge data tables should still probably access the replica of the table there. This outcomes in a proliferations of scholarship entry paths, and more work for the Optimizer. fortuitously, Db2 AI for z/OS can give the Optimizer the assistance it must beget smart access direction choices.the way it Works
The sequence of hobbies in Db2 AI for z/OS (See Reference 2) is often perquisite here:
There are moreover quite a lot of consumer interfaces that supply the administrator visibility to the popularity of the amassed SQL observation efficiency facts and mannequin scoring.abstract
IBM's machine studying for zOS (MLz) providing is being used to super sequel in Db2 edition 12 to enrich the performance of analytical queries in addition to operational queries and their associated applications. This requires management consideration, as you requisite to investigate that your company is prepared to consume these ML and AI conclusions. How will you measure the fees and advantages of using machine discovering? Which IT animate group of workers requisite to exist tasked to reviewing the outcome of mannequin scoring, and maybe approving (or overriding) the outcomes? How will you overview and justify the assumptions that the software makes about entry direction decisions?
In different words, how neatly sequel you know your facts, its distribution, its integrity and your latest and proposed entry paths? this will determine the residence the DBAs spend their time in aiding analytics and operational utility efficiency.
# # #
John Campbell, IBM Db2 wonderful EngineerFrom "IBM Db2 AI for z/OS: enhance IBM Db2 application efficiency with laptop getting to know"https://www.worldofdb2.com/routine/ibm-db2-ai-for-z-os-increase-ibm-db2-utility-performance-with-ma
Db2 AI for z/OShttps://www.ibm.com/help/knowledgecenter/en/SSGKMA_1.1.0/src/ai/ai_home.html
DBAs and builders working with IBM DB2 regularly utilize IBM records Studio. Toad DBA Suite for IBM DB2 LUW complements facts Studio with advanced features that beget DBAs and developers a lot more productive. How can Toad DBA Suite for IBM DB2 LUW handicap your company? download the tech quick to discover.download PDF
download the authoritative e-book: Cloud Computing 2019: the usage of the Cloud for competitive competencies
See the whole checklist of computing device discovering optionsfinal analysis
RapidMiner may moreover now not maintain the identify focus of AWS or Google, nonetheless it is a comprehensive data science platform. It aids groups in exploring, mixing and cleansing statistics, designing and refining predictive models through machine discovering and managing deployments. For organizations looking for a robust, expansive ML toolset, RapidMiner bears exploring.
RapidMiner uses a unified interface to maneuver numerous projects although a graphical drag-and-drop strategy. It offers pre-described computer getting to know libraries however moreover incorporates a lot of third-party libraries. This includes a whole bunch of add-ons encompassing computer studying, textual content analytics, predictive modeling, automation and manner manage.
This produces a quick classification and regression analysis system for both supervised and unsupervised gaining scholarship of. The solution moreover helps split and go-validation methods that enhance the accuracy of predictive models. both Gartner and Forrester rank RapidMiner as a “leader.” The dealer additionally earned a Gartner consumer’s option 2018 award.Product Description
RapidMiner strategies information science and desktop gaining scholarship of from a holistic viewpoint and presents a large number of tackle to wield myriad projects. The platform helps utter primary open supply facts science formats and provides greater than 60 connectors to control structured, unstructured and numerous sorts of massive information.https://o1.qnsr.com/log/p.gif?;n=203;c=204660772;s=9478;x=7936;f=201812281334210;u=j;z=TIMESTAMP;a=20403954;e=i
RapidMiner boasts that it presents more than 1,500 desktop getting to know and statistics prep functions, and it supports greater than forty info forms, including SAS, ARFF, Stata and by way of URL. It helps NoSQL, MongoDB and Casandra, and its Radoop product extends information environments into the open supply Hadoop space.
This makes it feasible to generate and re-use current R and Python code, and fuse and recombine current modules with modern extensions and modules. The platform moreover connects to foremost cloud storage functions similar to Amazon S3 and Dropbox. It writes to Qlik QVX or Tableau TDE files.Overview and lines person Base
facts scientists, developers, commerce analysts and citizen statistics scientists.Interface
Graphical user interface.Scripting Languages supported
Python, R and RapidMiner Studiocodecs Supported
more than 40 file varieties together with SAS, ARFF, Stata, and by means of URL. provides wizards for Microsoft exceed and access, CSV, and database connections. presents access to NoSQL databases MongoDB and Cassandra.Integration
guide for utter JDBC database connections together with Oracle, IBM DB2, Microsoft SQL Server, MySQL, Postgres, Teradata, Ingres, VectorWise, and others.Reporting and Visualization
in-built visualization tools. extensive logging capabilities.Pricing
$2,500 per user annually for the small version (one hundred,000 facts rows and a pair of analytic processors), $5,000 per consumer yearly for the medium edition (1,000,000 records rows and 4 analytic processors) and $10,000 per person yearly for unlimited entry.RapidMiner Overview and features at a glance:
supplier and lines
ML focal point
enormously computerized ML platform example for businesses aiming to utilize machine getting to know commonly.
Key features and capabilities
presents greater than 1,500 computing device discovering and facts prep services, and it helps more than 40 files forms. Connects to Amazon S3 and Dropbox.
among the highest rated data science and ML options. clients record it as efficient and “revolutionary” notwithstanding there are complaints concerning the requisite of GPU help.
Pricing and licensing
Tiered pricing ranging from $2,500 per consumer per year to upwards of $10,000 per consumer per 12 months.
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I’ve just completed IBM DB2 for Linux, Unix and Windows (LUW) coverage here on utilize The Index, Luke as preparation for an upcoming training I’m giving. This blog post describes the major differences I’ve create compared to the other databases I’m covering (Oracle, SQL Server, PostgreSQL and MySQL).Free & Easy
Well, let’s puss it: it’s IBM software. It has a pretty long history. You would probably not anticipate that it is simple to install and configure, but in fact: it is. At least DB2 LUW Express-C 10.5 (LUW is for Linux, Unix and Windows, Express-C is the free community edition). That might exist another surprise: there is a free community edition. It’s not open source, but it’s free as in free beer.No simple Explain
The first problem I stumbled upon is that DB2 has no simple way to array an execution plan. No kidding. Here is what IBM says about it:
Explain a statement by prefixing it with clarify manner for
This stores the execution manner in a set of tables in the database (you’ll requisite to create these tables first). This is pretty much fancy in Oracle.
Display a stored clarify manner using db2exfmt
This is a command line tool, not something you can topple from an SQL prompt. To rush this tool you’ll requisite shell access to a DB2 installation (e.g. on the server). That means, that you cannot utilize this tool over an regular database connection.
There is another command line tool (db2expln) that combines the two steps from above. Apart from the fact that this procedure is not exactly convenient, the output you procure an ASCII art:Access Plan: ----------- Total Cost: 60528.3 Query Degree: 1 Rows RETURN ( 1) Cost I/O | 49534.9 ^HSJOIN ( 2) 60528.3 68095 /-----+------\ 49534.9 10000 TBSCAN TBSCAN ( 3) ( 4) 59833.6 687.72 67325 770 | | 1.00933e+06 10000 TABLE: DB2INST1 TABLE: DB2INST1 SALES EMPLOYEES Q2 Q1
Please note that this is just an excerpt—the plenary output of db2exfmt has 400 lines. Quite a lot information that you’ll hardly ever need. Even the information that you requisite utter the time (the operations) is presented in a pretty unreadable way (IMHO). I’m particularly thankful that utter the numbers you perceive above are not labeled—that’s really the icing that renders this “tool” totally useless for the occasional user.
However, according to the IBM documentation there is another way to array an execution plan: “Write your own queries against the clarify tables.” And that’s exactly what I did: I wrote a view called last_explained that does exactly what it’s denomination suggest: it shows the execution manner of the last statement that was explained (in a non-useless formatting):Explain Plan ------------------------------------------------------------ ID | Operation | Rows | Cost 1 | return | | 60528 2 | HSJOIN | 49535 of 10000 | 60528 3 | TBSCAN SALES | 49535 of 1009326 ( 4.91%) | 59833 4 | TBSCAN EMPLOYEES | 10000 of 10000 (100.00%) | 687 Predicate Information 2 - join (Q2.SUBSIDIARY_ID = DECIMAL(Q1.SUBSIDIARY_ID, 10, 0)) join (Q2.EMPLOYEE_ID = DECIMAL(Q1.EMPLOYEE_ID, 10, 0)) 3 - SARG ((CURRENT DATE - 6 MONTHS) < Q2.SALE_DATE) Explain manner by Markus Winand - NO WARRANTY http://use-the-index-luke.com/s/last_explained
I’m pretty sure many DB2 users will screech that this presentation of the execution manner is confusing. And that’s OK. If you are used to the way IBM presents execution plans, just stick to what you are used to. However, I’m working with utter kinds of databases and they utter maintain a way to array the execution manner similar to the one shown above—for me this format is much more useful. Further, I’ve made a useful selection of data to display: the row weigh estimates and the predicate information.
You can procure the source of the last_explained view from here or from GitHub (direct download). I’m serious about the no warranty part. Yet I’d fancy to know about problems you maintain with the view.Emulating Partial Indexes is Possible
Partial indexes are indexes not containing utter table rows. They are useful in three cases:
To preserve space when the index is only useful for a very small fraction of the rows. Example: queue tables.
To establish a specific row order in presence of constant non-equality predicates. Example: WHERE x IN (1, 5, 9) ORDER BY y. An index fancy the following can exist used to avoid a sort operation:CREATE INDEX … ON … (y) WHERE x IN (1, 5, 9)
To implement unique constraints on a subset of rows (e.g. only those WHERE vigorous = 'Y').
However, DB2 doesn’t support a where clause for indexes fancy shown above. But DB2 has many Oracle-compatibility features, one of them is EXCLUDE NULL KEYS: “Specifies that an index entry is not created when utter parts of the index key accommodate the null value.” This is actually the hard-wired behaviour in the Oracle database and it is commonly exploited to emulate partial indexes in the Oracle database.
Generally speaking, emulating partial indexes works by mapping utter parts of the key (all indexed columns) to NULL for rows that should not discontinuance up in the index. As an example, let’s emulate this partial index in the Oracle database (DB2 is next):CREATE INDEX messages_todo ON messages (receiver) WHERE processed = 'N'
The solution presented in SQL Performance Explained uses a duty to map the processed rows to NULL, otherwise the receiver value is passed through:CREATE OR REPLACE FUNCTION pi_processed(processed CHAR, receiver NUMBER) RETURN NUMBER DETERMINISTIC AS BEGIN IF processed IN ('N') THEN return receiver; ELSE return NULL; discontinuance IF; END; /
It’s a deterministic duty and can thus exist used in an Oracle function-based index. This won’t work with DB2, because DB2 doesn’t allow user defined-functions in index definitions. However, let’s first complete the Oracle example.CREATE INDEX messages_todo ON messages (pi_processed(processed, receiver));
This index has only rows WHERE processed IN ('N')—otherwise the duty returns NULL which is not set in the index (there is no other column that could exist non-NULL). Voilà: a partial index in the Oracle database.
To utilize this index, just utilize the pi_processed duty in the where clause:SELECT message FROM messages WHERE pi_processed(processed, receiver) = ?
This is functionally equivalent to:SELECT message FROM messages WHERE processed = 'N' AND receiver = ?
So far, so ugly. If you retract for this approach, you’d better requisite the partial index desperately.
To beget this approach work in DB2 they requisite two components: (1) the EXCLUDE NULL KEYS clause (no-brainer); (2) a way to map processed rows to NULL without using a user-defined duty so it can exist used in a DB2 index.
Although the second one might seem to exist hard, it is actually very simple: DB2 can sequel expression based indexing, just not on user-defined functions. The mapping they requisite can exist accomplished with regular SQL expressions:CASE WHEN processed = 'N' THEN receiver ELSE NULL END
This implements the very very mapping as the pi_processed duty above. recall that CASE expressions are first class citizens in SQL—they can exist used in DB2 index definitions (on LUW just since 10.5):CREATE INDEX messages_not_processed_pi ON messages (CASE WHEN processed = 'N' THEN receiver ELSE NULL END) EXCLUDE NULL KEYS;
This index uses the CASE expression to map not to exist indexed rows to NULL and the EXCLUDE NULL KEYS feature to prevent those row from being stored in the index. Voilà: a partial index in DB2 LUW 10.5.
To utilize the index, just utilize the CASE expression in the where clause and check the execution plan:SELECT * FROM messages WHERE (CASE WHEN processed = 'N' THEN receiver ELSE NULL END) = ?; Explain Plan ------------------------------------------------------- ID | Operation | Rows | Cost 1 | return | | 49686 2 | TBSCAN MESSAGES | 900 of 999999 ( .09%) | 49686 Predicate Information 2 - SARG (Q1.PROCESSED = 'N') SARG (Q1.RECEIVER = ?)
Oh, that’s a expansive disappointment: the optimizer didn’t win the index. It does a plenary table scan instead. What’s wrong?
If you maintain a very near examine at the execution manner above, which I created with my last_explained view, you might perceive something suspicious.
Look at the predicate information. What happened to the CASE expression that they used in the query? The DB2 optimizer was smart enough rewrite the expression as WHERE processed = 'N' AND receiver = ?. Isn’t that great? Absolutely!…except that this smartness has just ruined my attempt to utilize the partial index. That’s what I meant when I said that CASE expressions are first class citizens in SQL: the database has a pretty proper understanding what they sequel and can transform them.
We requisite a way to apply their magic NULL-mapping but they can’t utilize functions (can’t exist indexed) nor can they utilize CASE expressions, because they are optimized away. Dead-end? Au contraire: it’s pretty simple to fuddle an optimizer. utter you requisite to sequel is to obfuscate the CASE expression so that the optimizer doesn’t transform it anymore. Adding zero to a numeric column is always my first attempt in such cases:CASE WHEN processed = 'N' THEN receiver + 0 ELSE NULL END
The CASE expression is essentially the same, I’ve just added zero to the RECEIVER column, which is numeric. If I utilize this expression in the index and the query, I procure this execution plan:ID | Operation | Rows | Cost 1 | return | | 13071 2 | FETCH MESSAGES | 40000 of 40000 | 13071 3 | RIDSCN | 40000 of 40000 | 1665 4 | SORT (UNQIUE) | 40000 of 40000 | 1665 5 | IXSCAN MESSAGES_NOT_PROCESSED_PI | 40000 of 999999 | 1646 Predicate Information 2 - SARG ( CASE WHEN (Q1.PROCESSED = 'N') THEN (Q1.RECEIVER + 0) ELSE NULL discontinuance = ?) 5 - START ( CASE WHEN (Q1.PROCESSED = 'N') THEN (Q1.RECEIVER + 0) ELSE NULL discontinuance = ?) STOP ( CASE WHEN (Q1.PROCESSED = 'N') THEN (Q1.RECEIVER + 0) ELSE NULL discontinuance = ?)
The partial index is used as intended. The CASE expression appears unchanged in the predicate information section.
I haven’t checked any other ways to emulate partial indexes in DB2 (e.g., using partitions fancy in more recent Oracle versions).
As always: just because you can sequel something doesn’t add up to you should. This approach is so ugly—even more grim than the Oracle workaround—that you must desperately requisite a partial index to justify this maintenance nightmare. Further it will stop working whenever the optimizer becomes smart enough to optimize +0 away. However, then you just requisite set an even more grim obfuscation in there.INCLUDE Clause Only for Unique Indexes
With the comprise clause you can add extra columns to an index for the sole purpose to allow in index-only scan when these columns are selected. I knew the comprise clause before because SQL Server offers it too, but there are some differences:
In SQL Server comprise columns are only added to the leaf nodes of the index—not in the root and arm nodes. This limits the impact on the B-tree’s depth when adding many or long columns to an index. This moreover allows to bypass some limitations (number of columns, total index row length, allowed data types). That doesn’t seem to exist the case in DB2.
In DB2 the comprise clause is only valid for unique indexes. It allows you to implement the uniqueness of the key columns only—the comprise columns are just not considered when checking for uniqueness. This is the very in SQL Server except that SQL Server supports comprise columns on non-unique indexes too (to leverage the above-mentioned benefits).
The NULLS FIRST and NULLS last modifiers to the order by clause allow you to specify whether NULL values are considered as larger or smaller than non-NULL values during sorting. Strictly speaking, you must always specify the desired order when sorting nullable columns because the SQL standard doesn’t specify a default. As you can perceive in the following chart, the default order of NULL is indeed different across various databases:
Figure A.1. Database/Feature Matrix
In this chart, you can moreover perceive that DB2 doesn’t support NULLS FIRST or NULLS LAST—neither in the order by clause no in the index definition. However, note that this is a simplified statement. In fact, DB2 accepts NULLS FIRST and NULLS last when it is in line with the default NULLS order. In other words, ORDER BY col ASC NULLS FIRST is valid, but it doesn’t change the result—NULLS FIRST is anyways the default. very is proper for ORDER BY col DESC NULLS LAST—accepted, but doesn’t change anything. The other two combinations are not valid at utter and yield a syntax error.SQL:2008 FETCH FIRST but not OFFSET
DB2 supports the fetch first … rows only clause for a while now—kind-of impressive considering it was “just” added with the SQL:2008 standard. However, DB2 doesn’t support the offset clause, which was introduced with the very very release of the SQL standard. Although it might examine fancy an capricious omission, it is in fact a very wise rush that I deeply respect. offset is the root of so much evil. In the next section, I’ll clarify how to live without offset.
Side node: If you maintain code using offset that you cannot change, you can still activate the MySQL compatibility vector that makes circumscribe and offset available in DB2. silly enough, combining fetch first with offset is then still not feasible (that would exist standard compliant).Decent Row-Value Predicates Support
SQL row-values are multiple scalar values grouped together by braces to configuration a single analytic value. IN-lists are a common use-case:WHERE (col_a, col_b) IN (SELECT col_a, col_b FROM…)
This is supported by pretty much every database. However, there is a second, hardly known use-case that has pretty poor support in today’s SQL databases: key-set pagination or offset-less pagination. Keyset pagination uses a where clause that basically says “I’ve seen everything up till here, just give me the next rows”. In the simplest case it looks fancy this:SELECT … FROM … WHERE time_stamp < ? ORDER BY time_stamp DESC FETCH FIRST 10 ROWS ONLY
Imagine you’ve already fetched a bunch of rows and requisite to procure the next few ones. For that you’d utilize the time_stamp value of the last entry you’ve got for the bind value (?). The query then just return the rows from there on. But what if there are two rows with the very very time_stamp value? Then you requisite a tiebreaker: a second column—preferably a unique column—in the order by and where clauses that unambiguously marks the residence till where you maintain the result. This is where row-value predicates promote in:SELECT … FROM … WHERE (time_stamp, id) < (?, ?) ORDER BY time_stamp DESC, id DESC FETCH FIRST 10 ROWS ONLY
The order by clause is extended to beget sure there is a well-defined order if there are equal time_stamp values. The where clause just selects what’s after the row specified by the time_stamp and id pair. It couldn’t exist any simpler to express this selection criteria. Unfortunately, neither the Oracle database nor SQLite or SQL Server understand this syntax—even though it’s in the SQL standard since 1992! However, it is feasible to apply the very logic without row-value predicates—but that’s rather inconvenient and simple to procure wrong.
Even if a database understands the row-value predicate, it’s not necessarily understanding these predicates proper enough to beget proper utilize of indexes that support the order by clause. This is where MySQL fails—although it applies the logic correctly and delivers the perquisite result, it does not utilize an index for that and is thus rather slow. In the end, DB2 LUW (since 10.1) and PostgreSQL (since 8.4) are the only two databases that support row-value predicates in the way it should be.
The fact that DB2 LUW has everything you requisite for convenient keyset pagination is moreover the reason why there is absolutely no reason to complain about the missing offset functionality. In fact I assume that offset should not maintain been added to the SQL standard and I’m lucky to perceive a vendor that resisted the urge to add it because its became share of the standard. Sometimes the standard is wrong—just sometimes, not very often ;) I can’t change the standard—all I can sequel is teaching how to sequel it perquisite and start campaigns fancy #NoOffset.
Figure A.2. Database/Feature Matrix
If you fancy my way of explaining things, you’ll trust for my reserve “SQL Performance Explained”.
Chances are, you maintain never heard of Amanda… in the sense of open source that is. And if you maintain not heard of Amanda, then chances are you maintain not heard of Zmanda either. I will clarify both, and I will give you my view of why it is primary for you to at least exist aware of these products and their relation to data protection. Whether you should invest in either depends on many factors that will become clear shortly.
Let's start with Amanda. Amanda is the most celebrated open source data protection product in the market today, at least based on the number of free downloads: 250,000 or more. fancy most free downloads, these usually promote from universities -- both students and IT folks -- and scientific labs. But, they moreover comprise individuals from corporations that are experimenting with open source. In a nutshell, Amanda is a client/server data protection software that runs on a Linux server (backup server) and protects clients that rush Windows, Linux or Unix (only a few variants at the moment). It was developed originally at the University of Maryland and then dropped into the world of open source. Since it was distributed to the open source community, hundreds of programmers maintain contributed to its development, bug fixes and its common trust and feeding. As a result, the usage of the product has continued to climb dramatically over the past few years.You can utilize Amanda for free. You can modify it and set it back in the ether for free. But, fancy utter open source software, if the software just stopped running in the middle of the night because your client application server was not yet supported, proper luck trying to procure support. Or anything else. Your best bet would exist to residence your request on one of many Web sites where users and developers animate each other out.
But, unlike Linux operating systems (where there are companies fancy RedHat and SUSE, which is now Novell) or Linux-based databases (where there are companies fancy mySQL), Amanda did not maintain a "for profit" sponsor until recently. In late 2005, a newly-formed company was charged with working to beget Amanda a more usable product that would exist able to support enterprises of utter sizes. In keeping with the open source model, Zmanda has grabbed leadership of this space and is feverishly encouraging additional programmers -- some internal to the company, but most belonging to other companies/organizations -- to enhance Amanda so it can effectively compete with Symantec NetBackup, EMC Networker, CommVault Galaxy, Tivoli and others that topple in the enterprise-class data protection software category. Even within the last six months, Amanda has promote a long way. But, it moreover has a long way to retract before I would deem it a plenary member of this class. Should you therefore ignore it? No. However, the reason I am writing this column is to beget you aware that, under the perquisite set of circumstances, Amanda is worth considering.
Enter Zmanda. The company has released a specific version of Amanda (two versions, actually) that they support under the classic open source subscription model. You pay only for subscription and support and not for the product itself, just fancy any other open source product. Of course, the whole concept is to price it such that the total cost of ownership is significantly (as in one-half to one-fourth the cost) lower than other commercial products.
But before you jump into the fray, quiz yourself the following questions:
I am sure that as you examine into these options you will maintain other questions that are specific to your organization's needs. Version 2.50 of Zmanda does maintain support for Windows and Linux, but not for utter celebrated flavors of Unix. It should support databases and other applications in the future but does not perquisite now. It moreover lacks a GUI and does not yet support utter the modern innovations that they maintain seen in the world of disk support (like VTL and CDP). But, it does maintain disk support. It moreover has some features that I wish they had in the other commercial offerings, fancy a non-proprietary data format and fancy having the talent to sequel a recovery without requiring the vendor's software. Of course, its Linux support is excellent.
In my view, actual innovation occurs when there is a monetary incentive and there is a discontinuity in the technology curve. That is why they maintain seen the massive transformation in data protection software in the past five years. SATA was the technology that opened up opportunities that just were not available before. But, before that, one could beget a pretty reasonable dispute that data protection software from utter the major vendors had become pretty bloated, and the rate of innovation was very slow. Adding support for a modern tape library does not weigh as innovation in my book. It is precisely at such times, when differentiation between vendors' products is low, that open source starts to beget a lot of sense. Thousands of programmers start developing and creating a simpler, less cumbersome product with adequate functionality for many companies that don't requisite it all. Also, they are cost-sensitive and fancy the freedom.
That is how mySQL and, of course, Linux itself got going. Now it is Zmanda. But unlike the other segments, data protection is now experiencing phenomenal innovation. So, Amanda's (and therefore, Zmanda's) challenge will exist to not only create the conventional tape-based functionality but moreover to add utter the modern juicy disk-based functionality that is coming in waves currently. I suspect it is up for the challenge but at least exist aware that there could exist a lag before you perceive utter of these features.
It was bound to happen. If database, J2EE, server virtualization and security tools got an open source counterpart, how far behind could data protection be? If you maintain simpler needs, cost is a major issue and you crave that liberty from the expansive vendor -- for whatever reason -- then you should check out this modern space. But my advice: sequel not rush a production environment without the support that comes with Zmanda. Amanda may exist free, but she can exist danger without the support.
About the author: Arun Taneja is the founder and consulting analyst for the Taneja Group. Taneja writes columns and answers questions about data management and related topics.
In-DepthIT Skills Poised To Pay
Advances in mobility, cloud, expansive Data, DevOps and digital delivery, plus the shift to more rapid release cycles of software and services, are enabling businesses to become more agile. IT workforce research and analyst solid Foote Partners assesses the IT skills gap these trends are creating, their impact on salaries and where the demand for expertise is headed.
It's difficult to find an employer not struggling to promote up with a unique tech staffing model that balances three things: the urgencies of modern digital innovation strategies, combating ever deepening security threats, and keeping integrated systems and networks running smoothly and efficiently. The staffing challenge has moved well beyond simply having to select between contingent workers, full-time tech professionals, and a variety of cloud computing and managed services options (Infrastructure as a Service [IaaS], Platform as a Service [PaaS], Software as a Server [SaaS]). Over the next few years, managers will continue to exist tasked with leading a massive transformation of the technology and tech-business hybrid workforce to focus on quickly and predictably delivering a wide variety of operational and revenue-generating infrastructure solutions involving Internet of Things (IoT) products and services, expansive Data advanced analytics, cybersecurity, and modern mobile and cloud computing capabilities. Consequently, tech professionals and developers must align their skills and interests accordingly to animate their employers meet existing and forthcoming digital transformation imperatives that are forcing deep, accelerated changes in technology organizations.
As cloud infrastructure becomes more capable of economically delivering performance and data at capacities and speeds once never imagined, organizations of utter sizes are seeking tech professionals and developers with the proper skills, knowledge, and competencies to create more agile and responsive environments.
At the very time, they're grappling to ensure reliability of existing infrastructure where any amount of downtime is less acceptable than ever. Along with that is an onslaught of cybersecurity attacks occurring more frequently that maintain many IT managers maxim they can't find adequate labor to animate them protect their existing networks and endpoints. The latest reminder was in the spotlight following the most powerful denial of service (DoS) attack to date in late October resulting from unprotected endpoints on surveillance cameras. IoT, machine-to-machine communications and telematics maintain introduced modern complexities ranging from the requisite to better secure the devices and the delivery points to which they connect. Meanwhile, the growing IoT landscape is unleashing an exponential flood of modern data from hundreds of millions of devices, and organizations requisite to blend their IT and operational systems and find people with expansive Data analytics skills to wield the cloud-based machine learning infrastructure that's now emerging. This generational shift in IT will set a premium on, or create a baseline requirement for, IT professionals willing to follow the money and perceive where their skills will exist most applicable. Whether you're a manager looking to ensure your staff can deliver on these changes or an IT professional deciding on a career direction, workforce requirements and customer expectations are changing.
If you're in the latter camp, it's primary to understand that the supply-and-demand aspect that drives compensation is moreover a moving target. IT pay has a long history of volatility and in 2016 they maintain seen even sharper swings in those premiums. Based on hiring patterns, the following overriding trends will drive market demand for IT professionals who maintain the experience, drive and skills to deliver solutions:
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