Planet Maria. DBIn this blog post, Ill discuss some of the My. SQL and Maria. DB default configuration differences, focusing on My. SQL 5. 7 and Maria. DB 1. 0. 2. Percona Server for My. SQL uses the same defaults as My. SQL, so I will not list them separately. Maria. DB Server is a general purpose open source database, created by the founders of My. SQL. Maria. DB Server referred to as Maria. DB for brevity has similar roots as Percona Server for My. SQL, but is quickly diverging from My. SQL compatibility and growing on its own. Maria. DB has become the default installation for several operating systems such as Red Hat Enterprise LinuxCent. OSFedora. Changes in the default variables can make a large difference in the out of box performance of the database, so knowing what is different is important. As Maria. DB grows on its own and doesnt remain 1. My. SQL, the defaults configuration settings might not mean everything or behave the way they used to. It might use different variable names, or implement the same variables in new ways. You also need to take into account that Maria. DB uses its own Aria storage engine that has many configuration options that do not exist in My. SQL. Note In this blog, I am looking at variables common to both My. SQL or Maria. DB, but have different defaults, not variables that are specific to either My. SQL or Maria. DB except for the different switches inside the optimizerswitch. Binary Logs. Variable. Maria. DB Default. My. SQL Defaultsyncbinlog. Mixed. Row. My. SQL has taken a more conservative stance when it comes to the binary log. In the newest versions of My. SQL 5. 7, they have updated two variables to help ensure all committed data remains intact and identical. Binlogformat was updated to row in My. SQL in order to prevent non deterministic statements from having different results on the slave. Row based replication also helps when performing a lot of smaller updates. Maria. DB defaults to the Mixed format. Mixed uses statement based format unless certain criteria are met. It that case, it uses the row format. You can see the detailed criteria for when the row format is used here https mariadb. The other difference that can cause a significant impact on performance is related to syncbinlog. Syncbinlog controls the number of commit groups to collect before synchronizing the binary log to disk. My. SQL has changed this to 1, which means that every transaction is flushed to disk before it is committed. This guarantees that there can never be a committed transaction that is not recorded even during a system failure. This can create a big impact to performance, as shown by a Roel Van de Paar in his blog https www. Maria. DB utilizes a value of 0 for syncbinlog, which allows the operating system to determine when the binlog needs to be flushed. This provides better performance, but adds the risk that if Maria. DB crashes or power is lost that some data may be lost. Microsoft Windows Kernel Processor Power Event Id 4672' title='Microsoft Windows Kernel Processor Power Event Id 4672' />My. ISAMVariable. Maria. DB Default. My. SQL Defaultmyisamrecoveroptions. BACKUP,QUICKOFFkeybuffersize. Inno. DB replaced My. Version 20150327 Maintained by Stephen J. Gowdy URL for Get Update http VIDPID USB. Details on dozens of NIST projects in computer security, cybersecurity, information security and privacy. ISAM as the default storage engine for some time now, but it is still used for many system tables. My. SQL has tuned down the My. ISAM settings, since it is not heavily used. When mysqld opens a table, it checks whether the table is marked as crashed, or was not closed properly, and runs a check on it based on the myisamrecoveroptions settings. My. SQL disables this by default, preventing recovery. Maria. DB has enabled the BACKUP and QUICK recovery options. BACKUP causes a tablename datetime. QUICK causes mysqld to not check the rows in a table if there are no delete blocks, ensuring recovery can occur faster. Maria. DB 1. 0. 2 increased the keybuffersize. This allows for more index blocks to be stored in memory. All threads use this buffer, so a small buffer can cause information to get moved in and out of it more quickly. Maria. DB 1. 0. 2 uses a buffer 1. My. SQL 5. 7 1. 34. Maria. DB 1. 0. 2 vsx 8. My. SQL 5. 7. Innodb. Variable. Maria. DB Default. My. SQL Defaultinnodbmaxundologsize. Mi. B1. 07. 37. 41. Mi. BInno. DB variables have remained primarily unchanged between Maria. DB 1. 0. 2 and My. SQL 5. 7. Maria. DB has reduced the innodbmaxundologsize starting in 1. This was reduced from My. SQLs default of 1. Mi. B to 1. 04. 85. Download Elcomsoft Wireless Security Auditor Full Crack Internet here. Mi. B. These sizes reflect the maximum size an undo tablespace can become before it is marked for truncation. The tablespace doesnt get truncated unless innodbundologtruncate is enabled, and it is disabled in My. SQL 5. 7 and Maria. DB 1. 0. 2 by default. Logging. Variable. Maria. DB Default. My. SQL Defaultlogerrorvarlogmysqld. ONOFFlogslowslavestatements. ONOFFlcmessagesdirusrsharemysql. Logs are extremely important for troubleshooting any issues so the different choices in logging for My. SQL 5. 7 and Maria. DB 1. 0. 2 are very interesting. The logerror variable allows you to control where errors get logged. Maria. DB 1. 0. 2 leaves this variable blank, writing all errors to stderr. My. SQL 5. 7 uses an explicitly created file at varlogmysqld. Maria. DB 1. 0. 2 has also enabled additional slow statement logging. Logslowadminstatements create a record for any administrative statements that are not typically written to the binlog. Logslowslavestatements log the replicated statements sent from the master, if they are slow to complete. My. SQL 5. 7 does not enable logging of these statements by default. Lcmessagesdir is the directory that contains the error message files for various languages. The variable defaults might be a little misleading in Maria. DB 1. 0. 2. Lcmessagesdir is left empty by default, although it still uses the same path as My. SQL 5. 7. The files are located in usrsharemysql by default for both databases. Performance Schema. Variable. Maria. DB Default. My. SQL Defaultperformanceschema. OFFONperformanceschemasetupactorssize. The performance schema is an instrumentation tool that is designed to help troubleshoot various performance concerns. My. SQL 5. 7 enables the performance schema, and many of its instruments, by default. My. SQL even goes so far as to detect the appropriate value for many Performance Schema variables instead of setting a static default. The Performance Schema does come with some overhead, and there are many blogs regarding how much this can impact performance. I think Sveta Smirnova said it best in her blog  Performance Schema Benchmarks OLTP RW test on your system No generic benchmark can exactly repeat a workload on your site. Maria. DB has disabled the Performance Schema by default, as well as adjusted a couple of the dynamic variables. Note that if you wish to disable or enable the Performance Schema, it requires a restart of the server since these variables are not dynamic. Performanceschemasetupactorssize and performanceschemasetupobjectssize have both been set to a static 1. My. SQL 5. 7. These both limit the number of rows that can be stored in relative tables. This creates a hard limit to the size these tables can grow to, helping to reduce their data footprint. SSLTLSVariable. Maria. DB Default. My. SQL Defaultsslcaca. Secure Sockets Layer SSL and Transport Layer Security TLS are cryptographic protocols that allow for secure communication. SSL is actually the predecessor of TLS, although both are often referred to as SSL. My. SQL 5. 7 and Maria. DB 1. 0. 2 support both ya. SSL and Open. SSL. The default configurations for SSLTLS differ only slightly between My. SQL 5. 7 and Maria. DB 1. 0. 2. My. SQL 5. These files are created in the base directory, identified by the variable basedir. Each of these variables is left blank in Maria. DB 1. 0. 2, so you need to set them before using secure connections. These variables are not dynamic, so be sure to set the values before starting your database. Query Optimizer. Maria. DB 1. 0. 2. My. SQL 5. Optimization. Meaning. Switch. NAOFFBatched Key Access. Controls use of BKA join algorithmbatchedkeyaccess. Computer Era 5. 6th Edition Singapore by Eastern Trade Media. Computer Era 5. 6th Edition Singapore   Published on Apr 1. Computer Era 5. 6th Edition Singapore.