How to install Linux operating system in VM Oracle

OracleDataPump (expdp/impdp) has obvious advantages over traditional export/import tools, and is especially suitable for large database environments. 1. Stronger performance: based on server-side processing, avoids client-side transfer bottlenecks, supports parallel operations, significantly improves the export and import speed; 2. More fine-grained control: provides parameters such as INCLUDE, EXCLUDE and QUERY to realize multi-dimensional filtering such as object type, table name, data row; 3. Higher recoverability: supports job pause, restart and attachment, which facilitates long-term task management and failure recovery; 4. More complete metadata processing: automatically record and rebuild index, constraints, permissions and other structures, supports object conversion during import, and ensures consistency of the target library.

Methods to cloning Oracle databases include using RMANDuplicate, manual recovery of cold backups, file system snapshots or storage-level replication, and DataPump logical cloning. 1. RMANDuplicate supports replication from active databases or backups, and requires configuration of auxiliary instances and execution of DUPLICATE commands; 2. The cold backup method requires closing the source library and copying files, which is suitable for controllable environments but requires downtime; 3. Storage snapshots are suitable for enterprise-level storage systems, which are fast but depend on infrastructure; 4. DataPump is used for logical hierarchical replication, which is suitable for migration of specific modes or tables. Each method has its applicable scenarios and limitations.

Oracleensurestransactiondurabilityandconsistencyusingredoforcommitsandundoforrollbacks.Duringacommit,Oraclegeneratesacommitrecordintheredologbuffer,markschangesaspermanentinredologs,andupdatestheSCNtoreflectthecurrentdatabasestate.Forrollbacks,Oracle

ThePGAisprocess-specificmemoryforindividualsessions,whiletheSGAissharedmemoryforalldatabaseprocesses.1.ThePGAholdssessionvariables,SQLexecutionmemory,andcursorstate,privatetoeachuserconnection.2.TheSGAincludesthebuffercache,redologbuffer,sharedpool,l

NativeDynamicSQL(NDS)ispreferredformostdynamicSQLtasksduetoitssimplicityandperformance,whileDBMS_SQLoffersmorecontrolforcomplexscenarios.1.UseNDSwhenhandlingknownquerieswithfixedcolumnsorvariablesandforbetterreadabilityandspeed.2.ChooseDBMS_SQLwhende

OracleSGA is composed of multiple key components, each of which undertakes different functions: 1. DatabaseBufferCache is responsible for caching data blocks to reduce disk I/O and improve query efficiency; 2. RedoLogBuffer records database changes to ensure transaction persistence and recovery capabilities; 3. SharedPool includes LibraryCache and DataDictionaryCache, which is used to cache SQL parsing results and metadata; 4. LargePool provides additional memory support for RMAN, parallel execution and other tasks; 5. JavaPool stores Java class definitions and session objects; 6. StreamsPool is used for Oracle

OracleDataDictionary is the core read-only structure of Oracle databases to store metadata, providing information such as database objects, permissions, users and status. 1. The main views include USER_xxx (current user object), ALL_xxx (current user access object) and DBA_xxx (full library objects require DBA permission). 2. Metadata such as table column information, primary key constraints, table annotations, etc. can be obtained through SQL query. 3. Usage scenarios cover development structure review, debug permission analysis, query performance optimization and automated script generation. Mastering naming rules and common views can efficiently obtain database configuration and structure information.

SQLPlanManagement(SPM)ensuresstablequeryperformancebypreservingknowngoodexecutionplansandallowingonlyverifiedplanstobeused.1.SPMcapturesandstoresexecutionplansinSQLplanbaselines.2.Newplansarecheckedagainstthebaselineandnotusedunlessprovenbetterorsafe