MySQL for the Oracle DBA - Object Management

4a. MySQL Object Management for the Oracle DBA Ronald Bradford Senior Consultant MySQL Inc January 2008 4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a1 Copyright 2008 MySQL Inc

Agenda GOAL: Creating and Managing MySQL Objects SQL Object Types  Creating Objects  Managing Objects  MySQL Data Dictionary  4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a2 Copyright 2008 MySQL Inc

Object Types User  No Sequences Database (Schema)  No Snapshots Tablespace / Data File  No Synonyms Table / Column  Index  View  Trigger  Stored Procedure  Stored Function  User Defined Function (UDF)  4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a4 Copyright 2008 MySQL Inc

Users There is no concept of user ownership within MySQL  All objects are part of a database (or 'schema')  Users only have object privileges assigned to them  4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a5 Copyright 2008 MySQL Inc

Table / Column Table Name is case sensitive (by default)  Reserved Words are permitted (appropriately quoted)  http://dev.mysql.com/doc/refman/5.1/en/reservedwords.html 4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a6 Copyright 2008 MySQL Inc

Indexes Default Index type is BTREE  Memory has HASH & BTREE Indexes  MyISAM has a FULLTEXT Index  4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a7 Copyright 2008 MySQL Inc

Views Updatable and nonupdatable views supported  view and table names must be unique  DEFINER clause allows view to run as the calling user,  or another defined user View restrictions  cannot contain a subquery in the FROM clause.  cannot refer to system or user variables.  cannot refer to prepared statement parameters.  Within a stored routine, the definition cannot refer to routine  parameters or local variables. 4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a8 Copyright 2008 MySQL Inc

Views View restrictions (cont)  Any table or view referred to in the definition must exist.  However after creation, underlying objects can be dropped or modified. View is not invalidated, but will throw error on usage. The definition cannot refer to a TEMPORARY table  You cannot create a TEMPORARY view.  The tables named in the view definition must already exist.  You cannot associate a trigger with a view.  View algorithms  MERGE  TEMPTABLE  UNDEFINED  Supports WITH CHECK OPTION  Do not support Materialized Views  4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a9 Copyright 2008 MySQL Inc

Triggers DML triggers only no system triggers  [BEFORE | AFTER] [INSERT | UPDATE | DELETE]  Only one of each trigger type supported  FOR EACH ROW, no FOR EACH STATEMENT  No INSTEAD OF  No WHEN Condition  NEW.col and OLD.col syntax  CALL statement for SP not permitted  No statements that implicitly or explicitly COMMIT |  ROLLBACK 4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a10 Copyright 2008 MySQL Inc

Stored Procedures PL/PSM (Persistent Stored Modules)  Non scrollable, read only cursors  Support for most loop types (FOR loops not yet)  DEFINER clause allows stored procedure to run as the  calling user, or another defined user No packages support  No anonymous blocks  No concept of dependency within MySQL  Stored procedures are not required for high  performance within MySQL 4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a11 Copyright 2008 MySQL Inc

User Defined Functions (UDF) Added as Object Files  Compiled and available on permanent basis  mysql> create function logger returns integer soname 'syslogudf.so'; mysql> select logger('logging from ' + version()); http://dev.mysql.com/doc/refman/5.0/en/addingfunctions.html 4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a12 Copyright 2008 MySQL Inc

MySQL Create Object Limitations No online ALTER Table  No online Add Tablespace Data File  Online Add Index (5.1)  Online Add Enum Value (5.1)  Online Add Column (5.1 MyISAM)  4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a13 Copyright 2008 MySQL Inc

MySQL Auto Increment Replacement for SEQUENCE Limitations  Only one per table  No System wide concept  No Get Next capability  Get Value after Insert with LAST_INSERT_ID()  No required in INSERT, or NULL can be used  No persistence of true max value used across restart  exists in Falcon 6.0  http://dev.mysql.com/doc/refman/5.0/en/exampleautoincrement.html 4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a14 Copyright 2008 MySQL Inc

MySQL Data Dictionary Two Present Sources Privilege/System Tables 'mysql' database  Information Schema  4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a16 Copyright 2008 MySQL Inc

'mysql' database Privileges (host, db ,user, tables_priv, columns_priv,procs_priv)  Help (help_category, help_keyword, help_relation, help_topic)  Time zones (time_zone, time_zone_name,  time_zone_leap_second, time_zone_transition, time_zone_transition_type) Procedure & Function (proc, func)  4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a17 Copyright 2008 MySQL Inc

INFORMATION_SCHEMA 5.0 SCHEMATA, TABLES, COLUMNS, TABLE_CONSTRAINTS,  VIEWS, STATISTICS USER_PRIVILEGES,  SCHEMA_PRIVILEGES,TABLE_PRIVILIGES, COLUMN_PRIVILEGES CHARACTER_SETS, COLLATIONS,  COLLATION_CHARACTER_SET_APPLICIBILITY ROUTINES, PROFILING  5.1 KEY_COLUMN_USAGE,PLUGINS,ENGINES,PARTITIONS,EVENT  S,FILES, REFERENTIAL_CONSTRAINTS, PROCESSLIST, GLOBAL_STATUS,  SESSION_STATUS,GLOBAL_VARIABLES,SESSION_VARIABLES 6.0 FALCON_  4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a18 Copyright 2008 MySQL Inc

INFORMATION_SCHEMA Examples Table Disk Size for given schema select table_name, table_rows, avg_row_length, data_length/1024/1024 as data_mb, index_length/1024/1024 as index_mb from information_schema.tables where table_schema='dbname' order by 4 desc; 4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a20 Copyright 2008 MySQL Inc

INFORMATION_SCHEMA Examples SELECT TABLE_SCHEMA, SUM((DATA_LENGTH + INDEX_LENGTH) / (1024 * 1024)) AS SIZE_MB FROM INFORMATION_SCHEMA.TABLES GROUP BY TABLE_SCHEMA ORDER BY SIZE_MB DESC SELECT ROUTINE_TYPE, ROUTINE_NAME FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_SCHEMA='dbname'; SELECT TRIGGER_NAME,EVENT_MANIPULATION,EVENT_OBJECT_TABLE, ACTION_STATEMENT FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_SCHEMA='dbname'; SELECT CONCAT('DROP TABLE ',table_name,';') INTO OUTFILE '/sql/drop_tables.sql' FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 4a. MySQL Object Management 'dbname'; MySQL The Best Online Database for modern applications Version 1.2 4a21 Copyright 2008 MySQL Inc

INFORMATION_SCHEMA Examples SELECT s.schema_name, CONCAT(IFNULL(ROUND((SUM(t.data_length)+ SUM(t.index_length))/1024/1024,2),0.00),'Mb') total_size, CONCAT(IFNULL(ROUND(((SUM(t.data_length) +SUM(t.index_length))SUM(t.data_free))/1024/1024,2), 0.00),'Mb') data_used, CONCAT(IFNULL(ROUND(SUM(data_free)/1024/1024,2),0.00),'Mb') data_free, IFNULL(ROUND((((SUM(t.data_length)+SUM(t.index_length)) SUM(t.data_free))/((SUM(t.data_length) +SUM(t.index_length)))*100),2),0) pct_used, COUNT(table_name) total_tables FROM information_schema.schemata s LEFT JOIN information_schema.tables t ON s.schema_name = t.table_schema WHERE s.schema_name != 'information_schema' GROUP BY s.schema_name ORDER BY pct_used DESC\\G 4a. MySQL Object Management MySQL The Best Online Database for modern applications Version 1.2 4a22 Copyright 2008 MySQL Inc

MySQL for the Oracle DBA - Object Management

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