Enq: SQ, enqsq

Enq: SQ, enqsq

-- Execution per minute
SQL> select SQL _id, mi, count (mi)
2 from (select event, SQL _id, to_char (sample_time, 'yyyymmdd hh24mi ') mi --,
3 -- session_id
4 from dba_hist_active_sess_history
5 where SQL _id = '7wxfw53bsmgpq'
6 and sample_time> to_date ('2014, 20140717 111100', 'yyyymmdd hh24mi ')
7 and sample_time <to_date ('2014, 20140717 111100', 'yyyymmdd hh24mi '))
8 group by SQL _id, mi
9 order by mi;

SQL _ID MI COUNT (MI)
------------------------------------
7wxfw53bsmgpq 20140717 0942 1
7wxfw53bsmgpq 20140717 0943 23
7wxfw53bsmgpq 20140717 0944 125
7wxfw53bsmgpq 20140717 0946 96
7wxfw53bsmgpq 20140717 0947 114
7wxfw53bsmgpq 20140717 0949 44

Through the image, it is found that the statement for getting the first sequence is of temporary performance.

-- Wait for events and statements
SQL> select event, SQL _id, mi, count (mi)
2 from (select substrb (event, 1.30) event, SQL _id, to_char (sample_time, 'yyyymmdd hh24mi ') mi --,
3 -- session_id
4 from dba_hist_active_sess_history
5 where SQL _id = '7wxfw53bsmgpq'

6 and sample_time> to_date ('2014, 20140717 111100', 'yyyymmdd hh24mi ')
7 and sample_time <to_date ('2014, 20140717 111100', 'yyyymmdd hh24mi '))
8 group by event, SQL _id, mi
9 order by mi;

EVENT SQL _ID MI COUNT (MI)
----------------------------------------------------------------------------------------------------
7wxfw53bsmgpq 20140717 0942 1
Buffer busy waits 7wxfw53bsmgpq 20140717 0943 1
Enq: SQ-contention 7wxfw53bsmgpq 20140717 0943 22
Buffer busy waits 7wxfw53bsmgpq 20140717 0944 3

Enq: sql-contention 7wxfw53bsmgpq 20140717 0944 122
Buffer busy waits 7wxfw53bsmgpq 20140717 0946 2
Enq: SQ-contention 7wxfw53bsmgpq 20140717 0946 94
Buffer busy waits 7wxfw53bsmgpq 20140717 0947 2
Enq: sql-contention 7wxfw53bsmgpq 20140717 0947 112
Buffer busy waits 7wxfw53bsmgpq 20140717 0949 1
Enq: SQ-contention 7wxfw53bsmgpq 20140717 0949 43

-- Query by size acquisition
SQL> select sequence_name, cache_size from dba_sequences where sequence_name like upper ('% qreque % ');

SEQUENCE_NAME CACHE_SIZE
----------------------------------------
Change QREQUESTNO 20 to 100 during testing

SQL>

 

-- Query by size acquisition
SQL> select sequence_name, cache_size from dba_sequences where sequence_name like upper ('% qreque % ');

SEQUENCE_NAME CACHE_SIZE
----------------------------------------
Change QREQUESTNO 20 to 100 during testing

 

Cube: What is the formula for SQ2?

What formula are you talking about? Is it the second or the third layer. The following are some methods:
I. concepts:
L = left, R = right, B = back, F = front, U = top, and D = bottom.
You only need to confirm the names of the two faces, and the names of the other faces are fixed. This plays a vital role in restoration operations and restoration formulas!
First, remember the following points
This is the basic knowledge of playing rubik's cube, and is also the result that blind and unskillful gamers have never paid attention to summing up and mastering it.
1) center block-the center of the six faces is called the center block (only one color)
2) edge block ---- A block adjacent to the center block consisting of two colors
3) corner block ---- eight blocks with three colors in the corner
Core Ideas:
No matter how the cube is rotated, the position of the central block will not change.
When B rotates the cube, the side block and the corner block will move, but the side block will not move to the corner block, and the corner block will not move to the side block !!
The basic idea of restoring the cube is to move the corner block and edge block to the "expected" position! Because the center block cannot be moved, the Red Area of the center block can only form a red area.
So when I say red, it means that the center block is red. The same applies to other colors.
The central block will always be the center around us! When selecting the reference, we should check the color of the central block. Because the corner block of the reference is moving during the operation of a formula, only the central block is not moving, guide us like a beacon.
Operation terms:
1) clockwise rotation (90 degrees)
2) clockwise rotation (90 degrees)
3) semi-circle rotation (180 degrees)
For example:
A) generally, the clockwise direction is not marked by a symbol. Only operation letters are written. For example, F means that the front is rotated 90 degrees clockwise;
B) -- ('). For example, l' indicates that the left side is rotated 90 degrees counterclockwise;
C) rotate 180 degrees -- (2 or "). For example, R2 means to rotate 180 degrees clockwise on the right side. Similarly, r'2 means to rotate 180 degrees counterclockwise on the right side. (Note that the so-called clockwise is to face up to the angle of the operation, such as B 'should be when we assume that when facing up to the back, we should see a clockwise rotation of 90 degrees .)
Restoration Process (method ):
At present, the fastest restoration time for cube masters in the world is about 10 seconds. Ordinary people can take 30 seconds to master the correct method and practice it with a little help. The most popular restoration method is Fridrich method.
The basic restoration ideas and procedures are as follows:
Frame cross --> first two layers --> last layer reversed --> last layer shift
Ii. Basics:
First, we can master the basic twisting method by practicing the restoration method!
Note: The Blue center block is the front F, the center block is the fundamental area, the shadow block is the target, and the blue block outside the fundamentals is the operated block. That is, move the blue block outside of the fundamental field to the position of the Shadow block.
These operations are the basic methods for restoring the cross and single-sided frames!
The ellipsis after method 2 means to continue the following operations:
B '2 is changed to the first graph in the 1 method. Then the method 1 (ubu') is OK.
3. The ellipsis following method 1 means to continue the following operations: B 'is changed to the first graph in method 1. Then the method 1 (ubu') is OK.
3. The ellipsis after method 2 indicates to continue the following operations: B is changed to the second figure in method 1. Then the method 1 (l' B 'L) is OK.
For the ellipsis behind Method 7, please exercise it yourself.
Tip: After Method 7 is completed, the Operation block will be rotated to position A, and then it will look like Method 5.
Now you can quickly and easily restore the cube side based on the above basic twist!
Please exercise diligently! Increase the twist speed and break into the new cube by the way!
It also helps you to understand the entire cube method and speed up restoration !... Remaining full text>

Which of the following words contains Z and Y, Q and X, SQ and X, and SQ and zx o (fill _ blank) O? A good answer is a plus.

Zany clown
Zephyr and wind, breeze
Zesty is energetic and energetic
Pyx ry container
Quadruplex: four-fold
Quixotism (U) Don Quixote-like character