rdbms

Infiniflash Benchmark

May 29, 2016 Architect, Architecture, hardware, MYSQL, performance No comments

Sandisk (FusionIO) and Nexenta are working together to build this SDS solution.

Infiniflash is a very large SDS production, which manages for very large DW system who requires large storage space and also high IOPS.

We test infiniflash system ,read this Infiniflash_benchmark

MySQL distributed message system

April 12, 2016 Architect, Architecture, hardware, MYSQL, replication, software No comments

Based on messages, we create mysql replication platforms , using async message to build strong distributed subscription system.

read this PDF : http://www.vmcd.org/docs/MySQL_async_message.pdf

TokuDB benchmark on PCIe

October 21, 2015 Architect, Architecture, hardware, Internals, MYSQL, performance No comments

MariaDB TokuDB benchmark on FusionIO ,Compare TokuDB and InnoDB engines.

read: TokuDB_benchmark

MySQL lost “AUTO_INCREMENT” after a long time

October 8, 2015 Internals, MYSQL, rdbms No comments

Description:

I create a empty table and then alter this table's "AUTO_INCREMENT" starts from 10000000.After a long time ,MySQL lost "AUTO_INCREMENT" definition when I show this table again. MariaDB has the same problem but Percona Server is fine.

$mysql06

Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 141028725
Server version: 5.6.17-log MySQL Community Server (GPL)

Copyright (c) 2000, 2014, 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.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> DROP TABLE IF EXISTS `test_bug` ;
Query OK, 0 rows affected, 1 warning (0.00 sec)


mysql> CREATE TABLE test_bug (
    ->   `id` BIGINT PRIMARY KEY NOT NULL AUTO_INCREMENT,
    ->   `consult_order_id` BIGINT ,
    ->   `pay_channel` INT COMMENT ,
    ->   `price` BIGINT ,
    ->   `trade_no` VARCHAR (64) ,
    ->   `right_no` VARCHAR (64) ,
    ->   `item_id` BIGINT NOT NULL,
    ->   `source_type` INT NOT NULL ,
    ->   `gmt_create` DATETIME DEFAULT CURRENT_TIMESTAMP ,
    ->   `gmt_modified` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP 
    -> ) ENGINE = INNODB DEFAULT CHARSET = utf8 ;
Query OK, 0 rows affected (0.01 sec)

mysql> 
mysql> ALTER TABLE test_bug 
    ->   ADD INDEX index_consult_order (consult_order_id) ;
Query OK, 0 rows affected (0.01 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> 
mysql> ALTER TABLE test_bug 
    ->   ADD INDEX index_right_no (right_no) ;
Query OK, 0 rows affected (0.00 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> 
mysql> ALTER TABLE test_bug 
    ->   AUTO_INCREMENT = 100000000 ;
Query OK, 0 rows affected (0.00 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> 
mysql> show create table  test_bug;
  
   CREATE TABLE `test_bug` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `consult_order_id` bigint(20) DEFAULT NULL ,
  `pay_channel` int(11) DEFAULT NULL COMMENT ,
  `price` bigint(20) DEFAULT NULL COMMENT ,
  `trade_no` varchar(64) DEFAULT NULL COMMENT ,
  `right_no` varchar(64) DEFAULT NULL COMMENT ,
  `item_id` bigint(20) NOT NULL COMMENT ,
  `source_type` int(11) NOT NULL COMMENT ,
  `gmt_create` datetime DEFAULT CURRENT_TIMESTAMP ,
  `gmt_modified` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ,
  PRIMARY KEY (`id`),
  KEY `index_consult_order` (`consult_order_id`),
  KEY `index_right_no` (`right_no`)
) ENGINE=InnoDB AUTO_INCREMENT=100000000 DEFAULT CHARSET=utf8  


1 row in set (0.00 sec)


wait about 24 hours , then show create table :


mysql> show create table test_bug; 

   CREATE TABLE `test_bug` (
  `id` BIGINT (20) NOT NULL AUTO_INCREMENT,
  `consult_order_id` BIGINT (20) DEFAULT NULL,
  `pay_channel` INT (11) DEFAULT NULL,
  `price` BIGINT (20) DEFAULT NULL,
  `trade_no` VARCHAR (64) DEFAULT NULL,
  `right_no` VARCHAR (64) DEFAULT NULL,
  `item_id` BIGINT (20) NOT NULL,
  `source_type` INT (11) NOT NULL,
  `gmt_create` DATETIME DEFAULT CURRENT_TIMESTAMP,
  `gmt_modified` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `index_consult_order` (`consult_order_id`),
  KEY `index_right_no` (`right_no`)
) ENGINE = INNODB DEFAULT CHARSET = utf8 

1 row in set (0.00 sec)  

AUTO_INCREMENT disappears .

Bug has been reported :https://bugs.mysql.com/bug.php?id=77743

NVMFS Supports Atomic Writes

September 6, 2015 Architect, hardware, Internals, MYSQL No comments

Benchmark for NVMFS (supports atomic writes ,so we can close double-write option on specific MySQL version )

tips: some Flash-based cards could support large block map , the main idea is to avoid fractured page writes.

http://www.vmcd.org/docs/nvmfs_benchmark.pdf

[Reprint]Injection MySQL – Function

August 24, 2015 Internals, linux, MYSQL, rdbms No comments

Reprint a PDF for MySQL Injection Test

MySQL Error Based SQL Injection Using EXP

MySQL checksum

August 19, 2015 MYSQL, replication, system No comments

how to use percona-tookit to verify mysql data

Read this PDF : mysql_checksum

How to configure AWR system

August 6, 2015 Architect, Architecture, mongodb, MYSQL, NoSQL, rdbms, software No comments

In this article, we introduce myawr and mongoawr system .

Read this PDF, you will learn how to configure them.

How to configure AWR system.

How to configure Tcpdump system

July 24, 2015 Architect, Architecture, Internals, MYSQL, network, system No comments

MySQL Tcpdump system : use percona-toolkit to analyze network packages

We can identify problem SQLs with high execution frequency.

With DBMON system and AWR system we can find problem SQLs in a special time (high frequency, occurs over a period of time)

View this PDF:

http://www.vmcd.org/docs/MySQL_TCPDUMP.pdf

How to configure WEBM

July 15, 2015 Architect, mongodb, MYSQL, software No comments

Architecture of WEBM system.

Reference:

http://www.vmcd.org/2014/10/webm_v2-has-been-released/
http://www.vmcd.org/2014/09/webm-mysql-database-performance-web-monitor/

View this PDF:

http://www.vmcd.org/docs/How%20to%20configure%20WEBM.pdf