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Percona Server for MySQL
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    • Home
      • The Percona XtraDB storage engine
      • List of features available in Percona Server for MySQL releases
      • Percona Server for MySQL feature comparison
      • Changed in Percona Server 8.0
      • Understand version numbers
      • Install Percona Server for MySQL
        • Install using APT repository
        • Files in DEB package
        • Build APT packages
        • Install from downloaded DEB packages
        • Apt pinning
        • Run Percona Server for MySQL
        • Uninstall
        • Install using a RPM repository
        • Files in RPM package
        • Install from downloaded RPM packages
        • Run Percona Server for MySQL
        • Uninstall
        • Install with binary tarballs
        • Binary tarballs available
        • Install Percona Server for MySQL from a source tarball
        • Compile Percona Server for MySQL 8.0 from source
      • Post-installation
      • Percona Server for MySQL in-place upgrading guide: from 5.7 to 8.0
      • Upgrade using the Percona repositories
      • Upgrade from systems that use the MyRocks or TokuDB storage engine and partitioned tables
      • Upgrade using Standalone Packages
      • Downgrade Percona Server for MySQL
      • Running Percona Server for MySQL in a Docker Container
      • Docker environment variables
      • Improved InnoDB I/O scalability
      • Adaptive network buffers
      • Multiple page asynchronous I/O requests
      • Thread pool
      • XtraDB performance improvements for I/O-bound highly-concurrent workloads
      • Prefix index queries optimization
      • Limit the estimation of records in a Query
      • Jemalloc memory allocation profiling
      • The ProcFS plugin
      • Binary logs and replication improvements
      • Compressed columns with dictionaries
      • Extended SELECT INTO OUTFILE/DUMPFILE
      • Extended SET VAR optimizer hint
      • Improved MEMORY storage engine
      • Suppress warning messages
      • Limiting the disk space used by binary log files
      • Support for PROXY protocol
      • SEQUENCE_TABLE(n) function
      • Slow query log rotation and expiration
      • Trigger updates
      • Extended mysqlbinlog
      • Extended mysqldump
      • InnoDB full-text search improvements
      • Too many connections warning
      • Handle corrupted tables
      • Percona Toolkit UDFs
      • Kill idle transactions
      • XtraDB changed page tracking
      • Enforcing storage engine
      • Expanded fast index creation
      • Backup locks
      • Audit log plugin
      • Start transaction with consistent snapshot
      • Extended SHOW GRANTS
      • Utility user
      • Working with SELinux
      • Working with AppArmor
      • PAM authentication plugin
      • Server variables
      • SSL improvements
      • Data masking
        • Using LDAP authentication plugins
        • LDAP authentication plugin system variables
        • Data at Rest Encryption
        • Use the keyring component or keyring plugin
          • Using the Key Management Interoperability Protocol (KMIP)
          • Use the Amazon Key Management Service (AWS KMS)
          • FIDO authentication plugin
        • Encryption functions
        • Encrypt File-Per-Table Tablespace
        • Encrypt schema or general tablespace
        • Encrypt system tablespace
        • Encrypt temporary files
        • Encrypt Binary Log Files and Relay Log Files
        • Encrypting the Redo Log data
        • Encrypt the undo tablespace
        • Rotate the master key
        • Advanced encryption key rotation
        • Encrypt doublewrite buffers
        • Verify the encryption for tables, tablespaces, and schemas
      • User statistics
      • Slow query log
      • Extended show engine InnoDB status
      • Show storage engines
      • Process list
      • Misc. INFORMATION_SCHEMA tables
      • Thread based profiling
      • InnoDB page fragmentation counters
      • Stacktrace
      • Libcoredumper
      • Manage group replication flow control
      • Group replication system variables
      • Percona MyRocks introduction
      • Percona MyRocks installation guide
      • Updated supported features
      • MyRocks limitations
      • Differences between Percona MyRocks and Facebook MyRocks
      • MyRocks Information Schema tables
      • MyRocks server variables
      • MyRocks status variables
      • Gap locks detection
      • Data loading
      • Installing and configuring Percona Server for MySQL with ZenFS support
      • TokuDB introduction
      • TokuDB installation
      • Use TokuDB
      • Fast updates with TokuDB
      • TokuDB files and file types
      • TokuDB file management
      • TokuDB background ANALYZE TABLE
      • TokuDB variables
      • TokuDB status variables
      • TokuDB fractal tree indexing
      • TokuDB troubleshooting
      • TokuDB Performance Schema integration
      • Frequently asked questions
      • Migrate and removing the TokuDB storage engine
      • Percona TokuBackup
      • Release notes index
      • Percona Server for MySQL 8.0.32-24 (2023-03-20)
      • Percona Server for MySQL 8.0.31-23 (2023-02-09)
      • Percona Server for MySQL 8.0.30-22 Update (2022-11-21)
      • Percona Server for MySQL 8.0.30-22 (2022-11-21)
      • Percona Server for MySQL 8.0.29-21 (2022-08-08)
      • Percona Server for MySQL 8.0.28-20 (2022-06-20)
      • Percona Server for MySQL 8.0.28-19 (2022-05-12)
      • Percona Server for MySQL 8.0.27-18 (2022-03-02)
      • Percona Server for MySQL 8.0.26-17 (2022-01-26)
      • Percona Server for MySQL 8.0.26-16 (2021-10-20)
      • Percona Server for MySQL 8.0.25-15 (2021-07-13)
      • Percona Server for MySQL 8.0.23-14 (2021-05-12)
      • Percona Server for MySQL 8.0.22-13 (2020-12-14)
      • Percona Server for MySQL 8.0.21-12 (2020-10-13)
      • Percona Server for MySQL 8.0.20-11 (2020-07-21)
      • Percona Server for MySQL 8.0.19-10 (2020-03-23)
      • Percona Server for MySQL 8.0.18-9
      • Percona Server for MySQL 8.0.17-8
      • Percona Server for MySQL 8.0.16-7
      • Percona Server for MySQL 8.0.15-6
      • Percona Server for MySQL 8.0.15-5
      • Percona Server for MySQL 8.0.14
      • Percona Server for MySQL 8.0.13-4
      • Percona Server for MySQL 8.0.13-3
      • Percona Server for MySQL 8.0.12-2rc1
      • List of variables introduced in Percona Server for MySQL 8.0
      • Development of Percona Server for MySQL
      • Trademark policy
      • Index of INFORMATION_SCHEMA tables
      • Frequently asked questions
      • Copyright and licensing information
      • Glossary
        • ACID
        • Atomicity
        • Consistency
        • Durability
        • Foreign Key
        • General Availability (GA)
        • Isolation
        • InnoDB
        • Jenkins
        • LSN
        • MariaDB
        • my.cnf
        • MyISAM
        • MySQL
        • NUMA
        • Percona Server for MySQL
        • Storage Engine
        • Tech Preview
        • XtraDB

    • ACID
    • Atomicity
    • Consistency
    • Durability
    • Foreign Key
    • General Availability (GA)
    • Isolation
    • InnoDB
    • Jenkins
    • LSN
    • MariaDB
    • my.cnf
    • MyISAM
    • MySQL
    • NUMA
    • Percona Server for MySQL
    • Storage Engine
    • Tech Preview
    • XtraDB

    Glossary¶

    ACID¶

    Set of properties that guarantee database transactions are processed reliably. Stands for Atomicity, Consistency, Isolation, Durability.

    Atomicity¶

    Atomicity means that database operations are applied following a “all or nothing” rule. A transaction is either fully applied or not at all.

    Consistency¶

    Consistency means that each transaction that modifies the database takes it from one consistent state to another.

    Durability¶

    Once a transaction is committed, it will remain so.

    Foreign Key¶

    A referential constraint between two tables. Example: A purchase order in the purchase_orders table must have been made by a customer that exists in the customers table.

    General Availability (GA)¶

    A finalized version of the product which is made available to the general public. It is the final stage in the software release cycle.

    Isolation¶

    The Isolation requirement means that no transaction can interfere with another.

    InnoDB¶

    A Storage Engine for MySQL and derivatives (Percona Server, MariaDB) originally written by Innobase Oy, since acquired by Oracle. It provides ACID compliant storage engine with foreign key support. As of MySQL version 5.5, InnoDB became the default storage engine on all platforms.

    Jenkins¶

    Jenkins is a continuous integration system that we use to help ensure the continued quality of the software we produce. It helps us achieve the aims of:

    • no failed tests in the trunk on any platform

    • aid developers in ensuring merge requests build and test on all platform

    • no known performance regressions (without a damn good explanation).

    LSN¶

    The Log Sequence Number (LSN) is an 8-byte number. Every data change adds an entry to the redo log and generates an LSN. The server increments the LSN with every change.

    MariaDB¶

    A fork of MySQL that is maintained primarily by Monty Program AB. It aims to add features, and fix bugs while maintaining 100% backward compatibility with MySQL.

    my.cnf¶

    The file name of the default MySQL configuration file.

    MyISAM¶

    A MySQL Storage Engine that was the default until MySQL 5.5.

    MySQL¶

    An open source database that has spawned several distributions and forks. MySQL AB was the primary maintainer and distributor until bought by Sun Microsystems, which was then acquired by Oracle. As Oracle owns the MySQL trademark, the term MySQL is often used for the Oracle distribution of MySQL as distinct from the drop-in replacements such as MariaDB and Percona Server for MySQL.

    NUMA¶

    Non-Uniform Memory Access (NUMA) is a computer memory design used in multiprocessing, where the memory access time depends on the memory location relative to a processor. Under NUMA, a processor can access its own local memory faster than non-local memory, that is, memory local to another processor or memory shared between processors. The whole system may still operate as one unit, and all memory is basically accessible from everywhere but at a potentially higher latency and lower performance.

    Percona Server for MySQL¶

    The Percona branch of MySQL with performance and management improvements.

    Storage Engine¶

    A storage engine is a piece of software that implements the details of data storage and retrieval for a database system. This term is primarily used within the MySQL ecosystem due to it being the first widely used relational database to have an abstraction layer around storage. It is analogous to a Virtual File System layer in an Operating System. A VFS layer allows an operating system to read and write multiple file systems (e.g. FAT, NTFS, XFS, ext3) and a Storage Engine layer allows a database server to access tables stored in different engines (for example, MyISAM or InnoDB).

    Tech Preview¶

    A tech preview item can be a feature, a variable, or a value within a variable. The term designates that the item is not yet ready for production use and is not included in support by SLA. A tech preview item is included in a release so that users can provide feedback. The item is either updated and released as general availability(GA) or removed if not useful. The item’s functionality can change from tech preview to GA.

    XtraDB¶

    The Percona improved version of InnoDB provides performance, features, and reliability above what is shipped by Oracle in InnoDB.

    Contact us

    For free technical help, visit the Percona Community Forum.

    To report bugs or submit feature requests, open a JIRA ticket.

    For paid support and managed or consulting services , contact Percona Sales.


    Last update: 2023-01-12
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