Evaluate the Impact of a SQL on the Database

Often, to evaluate a SQL, we need to examine how it performed in the past.

Few things are important here:

1. Average elapsed time
2. Buffer gets per execution
3. Frequency of execution (how many times it executes on an hourly/daily basis)

The following script can be used to generate this information from AWR. The script assumes a RAC database.
In addition to basic information like snap time, instance id, plan hash and schema name, the following information is also generated:

SQL_PROFILE – name of the SQL profile is one was used
ROWS_DELTA – total number of rows fetched by all executions within the snap window
BUFFER_GETS_DELTA — total block gets within the window for the SQL
EXECUTIONS_DELTA — total number of executions within the window for the SQL
SECS_PER_EXEC — average time per execution within the window for the SQL
GETS_PER_EXEC — average block gets per execution; indicates approximately how heavy the query is
EXECS_THIS_DAY — total daily executions of this query
GETS_THIS_DAY — total daily buffer gets from this query

Script

--
-- sqlhist.sql
-- Parameters
--  1. Number of days to look back
--  2. SQL ID
-- Purpose: Generate the sql performance history from AWR
--
set verify on
set echo on
set lines 250
set head on
set tab off

col sql_profile format a20 wrap
col execs_this_day format 999,999,999
col gets_this_day format 999,999,999,999

WITH snaps AS 
      (SELECT instance_number, snap_id
       FROM dba_hist_snapshot
       WHERE begin_interval_time > SYSDATE - &days
       )
SELECT /*artoftuning.net*/
     rs.*,
     SUM (executions_delta) OVER (PARTITION BY TRUNC (TO_DATE (snap_time, 'dd-mon-rr hh24:mi'))) AS execs_this_day,
     SUM (buffer_gets_delta) OVER (PARTITION BY TRUNC (TO_DATE (snap_time, 'dd-mon-rr hh24:mi'))) AS gets_this_day
FROM (SELECT --snap_id,
         (SELECT TO_CHAR (MIN (begin_interval_time),
             'dd-mon-rr hh24:mi')
          FROM dba_hist_snapshot
          WHERE   snap_id = s.snap_id
             AND instance_number = s.instance_number) snap_time,
         instance_number inst_id,
         parsing_schema_name schema,
         sql_id,
         sql_profile,
         plan_hash_value plan_hash,
         rows_processed_delta rows_delta,
         buffer_gets_delta,
         executions_delta,
         ROUND (elapsed_time_delta / 1000000 / DECODE (executions_delta, 0, 1, executions_delta), 2) secs_per_exec,
         ROUND (buffer_gets_delta  / DECODE (executions_delta, 0, 1, executions_delta)) gets_per_exec
FROM dba_hist_sqlstat s
WHERE sql_id = '&sql_id'
  AND (instance_number, snap_id) IN  (SELECT /*+no_unnest*/ instance_number, snap_id FROM snaps)
) rs
ORDER BY TO_DATE (snap_time, 'dd-mon-rr hh24:mi') DESC
/

CLEAR COLUMNS
-- end of script

Sample Output

Enter value for days: 1
old  4:      WHERE begin_interval_time > SYSDATE - &days )
new  4:      WHERE begin_interval_time > SYSDATE - 1 )
Enter value for sql_id: jjqmxszma79gi
old 33:      WHERE   sql_id = '&sql_id'
new 33:      WHERE   sql_id = 'jjqmxszma79gi'

SNAP_TIME       INST_ID SCHEMA    SQL_PROFILE  PLAN_HASH ROWS_DELTA BUFFER_GETS_DELTA EXECUTIONS_DELTA SECS_PER_EXEC GETS_PER_EXEC EXECS_THIS_DAY GETS_THIS_DAY
--------------- ------- --------------------- ---------- ---------- ----------------- ---------------- ------------- ------------- -------------- -------------
05-jan-15 12:00       1 MARKETING             2909821187          0                 0                0             0             0              4       3490638
05-jan-15 12:00       1 MARKETING             3363719406         11            968013                1         588.2        968013              4       3490638
05-jan-15 12:00       1 MARKETING              701902966          0                 0                0             0             0              4       3490638
05-jan-15 08:00       1 MARKETING             3363719406          1            967893                1        1320.4        967893              4       3490638
05-jan-15 08:00       1 MARKETING              701902966          0                 0                0             0             0              4       3490638
05-jan-15 08:00       1 MARKETING             2909821187          0                 0                0             0             0              4       3490638
05-jan-15 04:00       1 MARKETING             3363719406          0            951896                1         729.1        951896              4       3490638
05-jan-15 04:00       1 MARKETING              701902966          0                 0                0             0             0              4       3490638
05-jan-15 04:00       1 MARKETING             2909821187          0                 0                0             0             0              4       3490638
05-jan-15 00:00       1 MARKETING             2909821187          0                 0                0             0             0              4       3490638
05-jan-15 00:00       1 MARKETING             3363719406          0            602836                1        1228.4        602836              4       3490638
05-jan-15 00:00       1 MARKETING              701902966          0                 0                0             0             0              4       3490638
04-jan-15 23:00       1 MARKETING             3363719406          0            348655                0         644.1        348655              2       2268225
04-jan-15 23:00       1 MARKETING             2909821187          0                 0                0             0             0              2       2268225
04-jan-15 23:00       1 MARKETING              701902966          0                 0                0             0             0              2       2268225
04-jan-15 21:00       1 MARKETING             3363719406          0            360663                1         296.8        360663              2       2268225
04-jan-15 21:00       1 MARKETING              701902966          0                 0                0             0             0              2       2268225
04-jan-15 21:00       1 MARKETING             2909821187          0                 0                0             0             0              2       2268225
04-jan-15 20:00       1 MARKETING             2909821187          0                 0                0             0             0              2       2268225
04-jan-15 20:00       1 MARKETING              701902966          0                 0                0             0             0              2       2268225
04-jan-15 20:00       1 MARKETING             3363719406          0            582629                0        3257.7        582629              2       2268225
04-jan-15 19:00       1 MARKETING              701902966          0                 0                0             0             0              2       2268225
04-jan-15 19:00       1 MARKETING             2909821187          0                 0                0             0             0              2       2268225
04-jan-15 19:00       1 MARKETING             3363719406          0              8362                0         227.5          8362              2       2268225
04-jan-15 16:00       1 MARKETING             3363719406          3            967916                1         723.1        967916              2       2268225
04-jan-15 16:00       1 MARKETING             2909821187          0                 0                0             0             0              2       2268225
04-jan-15 16:00       1 MARKETING              701902966          0                 0                0             0             0              2       2268225

Conclusion

From the output, we can understand that the sample query runs 2-4 times daily and takes 5-30 minutes on the average. Gets per execution goes up to a million. But the rows per execution is too small.
So if this is a batch kind of SQL, it may be okay. But it may be worth to investigate the scope of improving the query. While it is always a good idea to reduce the load as much as possible, the system wide impact of this query may be not very significant.

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  32. The train entails lifting weights or resistance out to the perimeters, participating
    the upper back, and promoting proper posture.
    This not only enhances general back energy but in addition improves shoulder stability which can assist
    to scale back your threat of injury. Lateral raises
    additionally aid in creating the supporting muscular tissues of the back, together with the traps
    and rhomboids, leading to a more sculpted and highly effective again appearance.
    Cutler’s training style was constructed around high-volume coaching, and his again workouts had been no exception. He positioned a powerful emphasis on wide-grip
    pulldowns and seated rows to target the upper back and enhance width.

    Cutler’s methodical approach included frequent changes to his exercises, guaranteeing that his again improvement
    kept evolving.
    It’s additionally essential to note that the erector spinae help in lateral spine movement,
    so including some unsupported unilateral work is a good idea.
    Once youcan do greater than 5 reps, addresistance with a weighted vestor a dumbbell
    between your toes.This one hurts, but it’s the finalpiece in your again jigsaw.

    Face pulls are highly efficient when it comes to training the traps and rhomboids, and they
    additionally hit the rear delts and rotator cuffs as properly.
    For that purpose, a superior choice is to perform your pullovers
    from a standing place utilizing a cable machine.
    Pull the bar down towards your thighs while maintaining your arms straight
    throughout the motion. Focus on partaking the again muscle tissue as you pull down, then return to the starting place beneath management to maximise
    muscle activation. Along with pulls, Strongman carry workouts will construct large energy and size on your upper back and erector spinae.
    Use farmers walks to focus on your upper traps and front-loaded carries like
    sandbag carries to focus on your complete back and erectors.
    The rear delts (posterior deltoids) play a crucial role in upper again aesthetics,
    shoulder stability, and overall pulling power.

    Nonetheless, they are typically underdeveloped compared to the entrance and aspect delts, resulting in imbalances and poor posture.

    In this last section, we’ll shift our focus from principle to motion as we dive into the
    sensible side of constructing a wider, stronger
    again. With a give consideration to strength constructing, you will interact in targeted workout routines that can sculpt and strengthen your back muscles, serving to you develop
    a broader, extra impressive physique. It Is time to translate knowledge
    into action and remodel your aspirations into a actuality.

    Let’s get started building the broad, sturdy back you have all
    the time wished. His again exercises often included multiple sets of heavy compound movements like pull-ups and rows.

    He was also recognized for deadlifts, which helped build the thickness and strength that outlined his decrease again.
    Maintain your chest up, shoulders back and retract your shoulder blades,
    after which pull the rope back toward your face whereas on the similar time pulling the rope apart.
    A good kind cue here is to imagine that you’re attempting to hit a “back double bicep pose” on every rep.
    Merely attach a v-bar to the top pulley of a lat pulldown machine
    and then maintain onto the bar utilizing a neutral
    grip. To perform this back train, connect a
    straight bar to the highest of a cable machine and take a
    couple steps again. Stretching also stimulates the proprioceptors within the muscles, which are answerable
    for sending signals to the brain concerning the body’s position and movement.

    This activation helps improve muscle coordination and enhances the recruitment of all back muscles concerned within the train.
    You can pimp this transfer for significantly spectacular back features with only one
    simple trick. Alongside a extra pronounced chest and bigger
    arms, the want for a V-shape physique is one of the most common occurrences within the Men’s Health inbox.
    Thankfully, spending extra time on your rear will help
    you earn that coveted v-shape upper-body. ‘Having a balanced, well-rounded physique is what most
    of us aspire to have aesthetically, and coaching
    your back frequently will definitely assist with this,’ says West.
    Actually emphasize management with this one and concentrate on getting full activation in your upper back muscular tissues versus simply yanking the rope again together with your arms and forearms.

    The distinction is that you’re starting with your arms in entrance of
    you rather than overhead, slicing the vary of motion in half and reducing
    the expansion stimulus. Rows are nonetheless good for your
    lats, but they’re even higher on your other back muscles.
    Exercise #1 is tailored to cater to various preferences and health ranges by providing a
    spread of rowing workout routines designed to emphasize proper type and approach.

    Increase your torso barely with every rep. T-bar rows
    provide a greater stretch than barbell rows because you’ll find a way to simply start each rep from a deeper position and
    because of your narrower hand position. Constructing a world-class back requires focusing on the main muscle groups,
    together with the latissimus dorsi, trapezius, rhomboids, and lower
    back. Workouts like deadlifts, rows, pull-ups, and shrugs are important for exciting growth in these areas.
    Symmetry and proportions are crucial in competitions, as an overly wide again with out enough thickness, or
    vice versa, can throw off a physique’s stability.

    To achieve a back like these legendary bodybuilders,
    consistency, proper method, and attention to element
    are important. The landmine row is among the handiest exercises
    for growing a thick, muscular again.
    Try to hit some rep PRs, then take one week off from back training.
    At the bottom point in the range of motion, the
    bar ought to be slightly under the knee. If you’re working your left lat, the bar could be to your left, and stand to the right to
    work your right lat. You will immediately feel
    a deep contraction if you’re doing these accurately.
    And don’t fear one minute about machines not being “hardcore,” as
    a end result of Dorian Yates all the time included at least one Hammer Strength row
    when he skilled his legendary again that blocked out
    the sun. Wheeler’s rear double biceps was a signature pose, the place his intricate again details were on full display.
    His consideration to symmetry gave him a extremely aesthetic and refined look on this pose.

    When it comes to back workouts, making certain you’re taking adequate relaxation between units is important for maximizing muscle improvement.
    To optimize your back exercises, it’s necessary
    to incorporate quite lots of workouts. This not solely helps stop boredom but in addition ensures that every one the muscular tissues in your again are being effectively targeted.
    After correctly warming up, the next essential step
    is selecting the best weight in your again workouts. The key’s to select a weight that
    permits you to full every train with proper kind while still difficult your
    muscles. Preserve correct form all through
    every rep to attenuate strain in your decrease again and
    maximize engagement of targeted muscular tissues such because the latissimus dorsi, teres major, and posterior deltoids.

    To enhance back thickness, have interaction in weight training with exercises like lat pulldowns, Romanian deadlifts, and chin-ups.
    These targeted movements work muscle fibers intensely for a robust and sculpted back.
    The Dumbbell Lying Rear Delt Row is a highly effective train for building
    back thickness. By mendacity face down on an incline bench and performing rowing motions with dumbbells, this exercise specifically targets the rear deltoids and upper again muscles.
    In this bodybuilding back exercise, you’ll do higher reps within the cable rows
    for an enormous pump.
    It may need fallen out of trend a bit, and the ribcage
    enlargement half is questionable, but it’s an excellent
    finisher in your bodybuilding again workout. The latter permits
    you to create a massive overload with heavy weights, whereas rowing a dumbbell one facet at a time makes it easier to determine
    a good mind-muscle connection and squeeze your lats.
    Use an overhand grip and bend on the hips to just above a
    90-degree angle, leaning ahead till your upper body is slightly above
    parallel to the ground. If you stand upright, you transfer more of the work to your higher again and traps.

    Thoughts you, many athletes practice their pressing muscular
    tissues with much larger veracity than their again muscles.
    Your lats are the most important muscle in your back, especially when you
    lump them in along with your teres main (which has
    a similar function and sits beneath your lats). Your lats
    additionally fan out to the edges of your torso, making them visible from the entrance.
    When it comes to constructing a wide back—and a big higher physique overall—your lats are an excellent place to
    start. In conclusion, the 10 finest exercises for again thickness are essential for constructing a robust and sculpted again.
    These practical methods can be simply implemented into your workout routine, ensuring efficiency in reaching your health goals.

    His again combined thickness within the traps
    and lats with wonderful general mass, making his rear lat
    spread one of the most imposing in bodybuilding historical past.

    In Contrast To many opponents, his again was thick from high to bottom, with
    balanced development across each section. However, before you begin, be sure to
    put together your muscles and joints with a radical warm-up.
    Start with 5-10 minutes of cardio, e.g., a rower, elliptical, or air bike, after
    which do a couple of minutes of dynamic mobility and adaptability exercises on your
    elbows, shoulders, and decrease back.
    Dietary supplements similar to whey isolate present needed protein that helps restore and develop muscle tissue
    after exercises like bench press or squatting. Prioritizing rows over vertical pulling
    is crucial for achieving optimal results in back growth.
    Understanding the anatomy of the again and following the following pointers
    will guide you in sculpting a powerful, muscular again that enhances overall bodily performance.
    Understanding the again anatomy is crucial for focusing on workouts that develop
    thickness and strength. The again is a complex construction made up of bones,
    muscular tissues, and connective tissues. As you drive upwards through
    your heels and prolong hips into full lockout, every muscle from head to
    toe contracts isometrically to stabilize the burden.
    With toes planted hip-width aside, you grip the bar tightly—this motion works wonders on grip energy while also recruiting muscular tissues in the arms and forearms corresponding to brachioradialis.

    Focusing on back thickness isn’t nearly trying good—it’s
    a cornerstone for enhancing your whole muscular system.
    Sturdy again muscle tissue assist the vertebral column, which helps
    you preserve proper kind throughout squats, deadlifts, and bench presses.
    While perfecting your form and stopping injury should be prioritized, don’t be afraid to steadily improve the burden as you get stronger.
    Progressively overloading your muscle tissue by rising
    the resistance will assist stimulate development
    and energy growth in your again muscle tissue.
    Strengthening your back is about more than simply trying good;
    it translates to a sturdy basis that holds you upright, maintaining slouching and
    hunched shoulders at bay. Partaking in workout routines
    concentrating on the muscle tissue along the spine fosters an aligned posture, which not solely initiatives confidence but in addition serves as a protect
    towards strains and sprains. This means simpler workouts for
    all muscle teams, not simply the lats or traps.

    When it involves the number of sets, anything between 2-4 is sweet, more than that and you’re simply going to overtax
    the central nervous system (CNS). It’s one other cable exercise that allows you to benefit
    from the constant rigidity on the cable that can, once more, increase time underneath pressure.
    It Is additionally a fantastic variation for
    individuals with lower back points because the lower back muscles aren’t as engaged
    as they might be in a traditional hinge place. Plus, the more you weigh, the more weight you must pull, which increases the
    stimulus for power adaptations. You’ll also get a full again exercise that may construct slabs of thick
    muscle. Luckily, traps are easy to develop and have a tendency to grow quickly,
    particularly should you work them instantly.

    Get ready to unleash the full potential of your back as we discover these focused workouts and discover the trail to a broader, more formidable presence.
    A well-developed back not solely contributes to an impressive aesthetic but also plays a vital role
    in overall energy and posture. Amongst the myriad of muscle teams that comprise the back, reaching width is often a
    sought-after objective for a lot of fitness enthusiasts.

    A pronated (overhand) grip shall be mostly used to hit the muscles of the higher
    back because it’s going to naturally lend itself to a extra flared arm path.
    They argue that you want lots of selection and may hit the
    muscles from many angles. If you need a giant and full again, they claim you need to differentiate between training
    for again thickness versus again width. The weight must be high enough you
    could hit a full range of motion whilst getting good contraction to the focused muscular tissues.

    References:

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