car_trims is an InnoDB table, has ~ 40 fields, an average line length of 230 bytes, no columns of type TEXT or BLOB
car_trims.id is PK
Query 1: .0007 seconds
SELECT * FROM car_trims ORDER BY id LIMIT 2
Query 2: 0.023 seconds
SELECT id FROM car_trims ORDER BY id LIMIT 50000, 2
Query 3: 0.09 seconds
SELECT * FROM car_trims ORDER BY id LIMIT 50000, 2
First of all, I do not understand why query 2 is so slow, but it's reasonably acceptable. What I really do not understand is why query 3 takes almost 100 ms to read the row data with the primary key.
In my understanding, the database should retrieve the PK from memory to locate the line on the hard drive and then read it out. Query 3 should not take much longer than Query 1.
id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE car_trims NULL index NULL PRIMARY 4 NULL 50002 100.00 NULL
[mysqld] # # * Basic Settings # user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp lc-messages-dir = /usr/share/mysql skip-external-locking sql_mode = "NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION" # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. bind-address = 127.0.0.1 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover-options = BACKUP # # * Query Cache Configuration # query_cache_type=0 #query_cache_limit = 1M #query_cache_size = 16M # # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. # As of 5.1 you can enable the log at runtime! #general_log_file = /var/log/mysql/mysql.log #general_log = 1 # # Error log - should be very few entries. # log_error = /var/log/mysql/error.log # # Here you can see queries with especially long duration #log_slow_queries = /var/log/mysql/mysql-slow.log #long_query_time = 2 #log-queries-not-using-indexes # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M #binlog_do_db = include_database_name #binlog_ignore_db = include_database_name # # * InnoDB # # InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. # Read the manual for more InnoDB related options. There are many! # # * Security Features # # Read the manual, too, if you want chroot! # chroot = /var/lib/mysql/ # # For generating SSL certificates I recommend the OpenSSL GUI "tinyca". # # ssl-ca=/etc/mysql/cacert.pem # ssl-cert=/etc/mysql/server-cert.pem # ssl-key=/etc/mysql/server-key.pem # Custom Stuff performance-schema=0 event_scheduler=ON slow-query-log=1 long-query-time=1 max_user_connections=1000 max_connections=1100 table_open_cache=8192 key_buffer_size=64M #myisam table index buffer max_connect_errors=20 max_allowed_packet=256M sort_buffer_size=2M read_buffer_size=2M read_rnd_buffer_size=4M myisam_sort_buffer_size=64M max_heap_table_size=256M tmp_table_size=256M thread_cache_size=100 concurrent_insert=2 innodb_buffer_pool_size=1024M innodb_buffer_pool_instances=8 innodb_flush_method=O_DIRECT innodb_flush_log_at_trx_commit=2 innodb_log_file_size=32M #see http://dev.mysql.com/doc/refman/5.0/en/adding-and-removing.html innodb_old_blocks_time=1000 innodb_stats_on_metadata=off innodb_log_buffer_size=16M innodb_file_per_table=1 open_files_limit=10000
CREATE TABLE t (A INT); INSERT INTO t VALUES(1),(2),(3),(4),(5);
SELECT A FROM t WHERE A=(SELECT 1)
That does not do:
SELECT A FROM t LIMIT (SELECT 1);
SELECT A FROM t WHERE A=substring((SELECT 123),1,1);
That does not do:
SELECT A FROM t WHERE A=1 PROCEDURE ANALYSE((SELECT 1),10000);
As a result, some clauses and functions do not support SELECT statements and others. I would think that would work
(SELECT 1) returns a
1 As a parameter and as long as the parameter is the expected type, it should work. This seems to be true in some cases but not in others. Why is that?
Recently, I've learned about LOOP programs that always end and have the same computational power as primitive recursive functions.
In addition, primitive recursive functions (as far as I understand) can compute everything that does not grow faster than $ Ack (n) $,
Does this mean that the upper limit of runtime complexity for LOOP programs is? $ O (confirmation (s)) $? And there are functions similar to those of Ackermann, which can not be calculated with primitive recursive functions, but grow slower than $ Ack (n) $?
(Sorry for spelling and grammar)
I do the search and return the tweets to a specific number and then get … and not the whole tweet. I already tried tweet_mode = & # 39; extended & # 39; to put, but it did not work.
Another problem is that I pass a date as a reference and the search is not performed by date.
#Buscando tweets textPT = () for tweet in tweepy.Cursor(api.search, q="jairbolsonaro", tweet_mode='extended', lang="pt", since = '2019-10-10').items(100): textPT.append(unidecode(tweet.full_text)) print(textPT)
QR code has a very limited data capacity. (According to Wikipedia) A single QR code can only contain <3 KB of binary data.
It's not uncommon for a PSBT to reach this 3 KB limit, especially for those who spend non-SegWit UTXOs.
SegWit offers the possibility to sign input values. However, to sign non-SegWit entries in the offline / hardware wallet, complete data from previous transactions is still required to validate the input values. Otherwise, it could be a security issue: A malicious party / malware could secretly manipulate the submissions to trick the user into paying an unexpectedly high amount.
I have the following equation:
$ y = 1- (1-x) ^ a $, Where $ x in (0,1) $while $ a $ is a non-negative integer.
Is there a way to estimate an upper limit (preferably a close one)?
I tried to calculate the limit of an expression, say:
Limit(1, c -> I, Assumptions -> Im(c) > 1)
And I got a message
Limit::cas, At first I thought that maybe the name
c was used by some packages. The problem persists, even if I replace it
c with other names. The version of Mathematica on my computer is "11.0.0 for Linux x86 (64-bit) (July 28, 2016)". Does anyone have similar problems with other versions?
To let $ T geq 0 $, Suppose GRH (T + 100), that is, all non-trivial zeroes $ rho $ the Riemann zeta function with $ | Im ( rho) | leq T + 100 $ fulfill $ Re ( rho) = 1/2 $, Can we then give a good upper limit? $ | 1 / zeta (s) | $ (that is, a good lower limit for $ | zeta (s) | $) to the $ s = sigma + it $. $ | t | leq T $. $ sigma = 3/4 $ or $ sigma = 1 $, say?
(There are known analogue barriers $ zeta (s) / zeta (s) $.)
I have sent a support request and received this message:
To receive the 100 emails per day, you need to select them
Email API Trial or Trial of Marketing Campaigns. You can do this by clicking
navigate to the settings > account details > Your products > Start test to send more,
When you start the trial, you will receive 40,000 emails per month, but
only for 30 days. Once your 30-day trial period has expired, you will
You can only send up to 100 emails per day (if you do not want to)
update your account).
If you do not start the trial, you can only send 100
Emails per month.
In short, you can now only send 100 emails per month, and if you
Start the trial, where you can send up to 40,000 emails
first month and 100 emails per day from that point in time.
In other words, when you create your account for the first time, it starts with just 100 emails per month. However, you can fix this by starting the trial.
I tried that and now it works as expected.
Note that you do not need to provide your credit card details to sign up for the trial, so this does not appear to be a disadvantage.
I am not sure why the account is not 100 by default from the start. I think their goal is to get you more interested in their paid plan.