mysqlslap是一種診斷程式用來模擬MySQL伺服器的客戶端負載並報告每個階段的時間。它模擬多個客戶端同時訪問MySQL服務。

mysqlslap語法如下:

Usage: mysqlslap [OPTIONS]

它有許多選項可以使用:

有些選項比如--create或--query能夠讓你指這一個字串包含一個SQL語句或一個檔案來包含SQL語句。如果你指定一個檔案，預設情況是它必須每行包含一個SQL語句(也就是說隱式語句分隔符是換行符)。使用--delimiter選項來指定不同的分隔符，它能讓你指定一個語句跨越多行或者將多個語句放入一行。在檔案中不能包含註釋，mysqlslap不能解析它們。

mysqlslap執行分為三個階段
1.建立方案，表和可選的任何儲存過程或用於測試的資料。這個階段使用單個客房端連線。

2.執行負載測試，這個階段可以使用多個客戶端連線。

3.清除(斷開連線，如果指定刪除表)。這個階段使用單個客戶端連線。

例如:
假設你建立和查詢SQL語句，而且想使用50個客戶端來執行查詢並且每個語句執行200次（在單行中輸入命令):

mysqlslap  --delimiter=";" --create="create table a(b int);insert into a values(11)" --query="select * from a"  --concurrency=50 --iterations=200

執行結果如下:

[mysql@localhost ~]$ mysqlslap -h192.168.1.250 -P33306 -uroot -p123456 mysql --delimiter=";" --create="create table a(b int);insert into a values(11)" --query="select * from a"  --concurrency=50 --iterations=200
mysqlslap: [Warning] Using a password on the command line interface can be insecure.
Benchmark
        Average number of seconds to run all queries: 0.268 seconds
        Minimum number of seconds to run all queries: 0.257 seconds
        Maximum number of seconds to run all queries: 0.370 seconds
        Number of clients running queries: 50
        Average number of queries per client: 1

讓mysqlslap來使用一個有兩個INT列和三個varchar列的表來構建查詢SQL語句。使用五個客戶端每個客戶端查詢20次。不建立表或不插入資料(使用之前的測試方案和資料):

mysqlslap --concurrency=5 --iterations=20 --number-int-cols=2 --number-char-cols=3 --auto-generate-sql

執行結果如下:

[mysql@localhost ~]$ mysqlslap -h192.168.1.250 -P33306 -uroot -p123456 mysql --concurrency=5 --iterations=20 --number-int-cols=2 --number-char-cols=3 --auto-generate-sql
mysqlslap: [Warning] Using a password on the command line interface can be insecure.
Benchmark
        Average number of seconds to run all queries: 0.247 seconds
        Minimum number of seconds to run all queries: 0.182 seconds
        Maximum number of seconds to run all queries: 0.361 seconds
        Number of clients running queries: 5
        Average number of queries per client: 0

為了告訴程式從指定的檔案中載入建立，插入和查詢的SQL語句，這裡給--create選項指定create.sql檔案，它包含了由分號隔開的多個建立表的語句和多個插入語句。--query選項指定的query.sql檔案包含由分號隔開的多個查詢語句。執行所有載入的語句，然後使用五個客戶端執行查詢檔案中的所有查詢(每個執行五次):

mysqlslap --concurrency=5 --iterations=5 --query=query.sql --create=create.sql --delimiter=";"

執行結果如下:

[mysql@localhost ~]$ mysqlslap -h192.168.1.250 -P33306 -uroot -p123456 mysql --concurrency=5 --iterations=5 --query=query.sql --create=create.sql --delimiter=";"
mysqlslap: [Warning] Using a password on the command line interface can be insecure.
Benchmark
        Average number of seconds to run all queries: 0.035 seconds
        Minimum number of seconds to run all queries: 0.034 seconds
        Maximum number of seconds to run all queries: 0.038 seconds
        Number of clients running queries: 5
        Average number of queries per client: 5

mysqlslap支援以下選項，可以在命令列指定或在選項檔案中透過[mysqlslap]和[client]組來指定

[mysql@localhost ~]$ mysqlslap --help
mysqlslap Ver 1.0 Distrib 5.7.26, for Linux (x86_64)
Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Run a query multiple times against the server.
Usage: mysqlslap [OPTIONS]
Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf /mysqlsoft/mysql/etc/my.cnf /mysqlsoft/mysql/my.cnf ~/.my.cnf
The following groups are read: mysqlslap client
The following options may be given as the first argument:
--print-defaults Print the program argument list and exit.
--no-defaults Don't read default options from any option file,
except for login file.
--defaults-file=# Only read default options from the given file #.
--defaults-extra-file=# Read this file after the global files are read.
--defaults-group-suffix=#
Also read groups with concat(group, suffix)
--login-path=# Read this path from the login file.
-?, --help Display this help and exit.
-a, --auto-generate-sql
Generate SQL where not supplied by file or command line.
--auto-generate-sql-add-autoincrement
Add an AUTO_INCREMENT column to auto-generated tables.
--auto-generate-sql-execute-number=#
Set this number to generate a set number of queries to
run.
--auto-generate-sql-guid-primary
Add GUID based primary keys to auto-generated tables.
--auto-generate-sql-load-type=name
Specify test load type: mixed, update, write, key, or
read; default is mixed.
--auto-generate-sql-secondary-indexes=#
Number of secondary indexes to add to auto-generated
tables.
--auto-generate-sql-unique-query-number=#
Number of unique queries to generate for automatic tests.
--auto-generate-sql-unique-write-number=#
Number of unique queries to generate for
auto-generate-sql-write-number.
--auto-generate-sql-write-number=#
Number of row inserts to perform for each thread (default
is 100).
--commit=# Commit records every X number of statements.
-C, --compress Use compression in server/client protocol.
-c, --concurrency=name
Number of clients to simulate for query to run.
--create=name File or string to use create tables.
--create-schema=name
Schema to run tests in.
--csv[=name] Generate CSV output to named file or to stdout if no file
is named.
-#, --debug[=#] This is a non-debug version. Catch this and exit.
--debug-check This is a non-debug version. Catch this and exit.
-T, --debug-info This is a non-debug version. Catch this and exit.
--default-auth=name Default authentication client-side plugin to use.
-F, --delimiter=name
Delimiter to use in SQL statements supplied in file or
command line.
--detach=# Detach (close and reopen) connections after X number of
requests.
--enable-cleartext-plugin
Enable/disable the clear text authentication plugin.
-e, --engine=name Storage engine to use for creating the table.
-h, --host=name Connect to host.
-i, --iterations=# Number of times to run the tests.
--no-drop Do not drop the schema after the test.
-x, --number-char-cols=name
Number of VARCHAR columns to create in table if
specifying --auto-generate-sql.
-y, --number-int-cols=name
Number of INT columns to create in table if specifying
--auto-generate-sql.
--number-of-queries=#
Limit each client to this number of queries (this is not
exact).
--only-print Do not connect to the databases, but instead print out
what would have been done.
-p, --password[=name]
Password to use when connecting to server. If password is
not given it's asked from the tty.
--plugin-dir=name Directory for client-side plugins.
-P, --port=# Port number to use for connection.
--post-query=name Query to run or file containing query to execute after
tests have completed.
--post-system=name system() string to execute after tests have completed.
--pre-query=name Query to run or file containing query to execute before
running tests.
--pre-system=name system() string to execute before running tests.
--protocol=name The protocol to use for connection (tcp, socket, pipe,
memory).
-q, --query=name Query to run or file containing query to run.
--secure-auth Refuse client connecting to server if it uses old
(pre-4.1.1) protocol. Deprecated. Always TRUE
-s, --silent Run program in silent mode - no output.
-S, --socket=name The socket file to use for connection.
--sql-mode=name Specify sql-mode to run mysqlslap tool.
--ssl-mode=name SSL connection mode.
--ssl Deprecated. Use --ssl-mode instead.
(Defaults to on; use --skip-ssl to disable.)
--ssl-verify-server-cert
Deprecated. Use --ssl-mode=VERIFY_IDENTITY instead.
--ssl-ca=name CA file in PEM format.
--ssl-capath=name CA directory.
--ssl-cert=name X509 cert in PEM format.
--ssl-cipher=name SSL cipher to use.
--ssl-key=name X509 key in PEM format.
--ssl-crl=name Certificate revocation list.
--ssl-crlpath=name Certificate revocation list path.
--tls-version=name TLS version to use, permitted values are: TLSv1, TLSv1.1
-u, --user=name User for login if not current user.
-v, --verbose More verbose output; you can use this multiple times to
get even more verbose output.
-V, --version Output version information and exit.

mysqlslap 負載模擬客戶端

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