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Monday, October 16, 2017

Oracle Packages Used for Performance Tuning





Oracle Packages Used for Performance Tuning:
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DBMS_ADDM
This package provides procedures to manage Oracle Automatic Database Diagnostic Monitor
Procedures
The most relevant procedures are:
ANALYZE_DB: creates an ADDM task to analyze the database and execute it
ANALYZE_INST: creates an ADDM task for analyzing in instance analysis mode
and executes it
GET_REPORT: retrieves the default text report of an executed ADDM task

DBMS_ADVISOR
This package helps in managing the Advisors, a set of expert systems that identify and
help resolve performance problems related to various database server components.
Procedures
The most relevant procedures are:
SET_DEFAULT_TASK_PARAMETER: sets the default values for task parameters
QUICK_TUNE: performs an analysis on a single SQL statement
EXECUTE_TASK: executes the specified task

DBMS_JOB
Schedules and manages jobs in the database job queue.
Oracle recommends using the DBMS_SCHEDULER package.
Procedures
The most relevant procedures are:
SUBMIT: submits a new job to the job queue
RUN: forces a specified job to run
NEXT_DATE: alters the next execution time for a specified job
BROKEN: deletes a job execution
REMOVE: removes the specified job from the job queue


DBMS_LOB
This package provides procedures to work with BLOBs, CLOBs, NCLOBs, BFILEs, and
temporary LOBs.
Procedures
The most relevant procedures are:
GET_LENGTH: gets the length of the LOB value
FILEOPEN: opens a file
LOADFROMFILE: loads LOB data from a file
APPEND: appends the contents of a source LOB to a destination LOB
OPEN: opens an LOB
READ: reads data from the LOB starting at the specified offset
WRITE: writes data to the LOB from a specified offset
CLOSE: closes a previously opened LOB


DBMS_MVIEW
This package helps the management of Materialized Views, refreshes them and helps
understanding the capabilities for materialized views and potential materialized views.
Procedures
The most relevant procedures are:
EXPLAIN_MVIEW: explains what is possible with a materialized view or potential
materialized view
EXPLAIN_REWRITE: explains why a query failed to rewrite or why the optimizer
chose to rewrite a query with a particular materialized view(s)
REFRESH: refreshes one or more materialized views
REFRESH_ALL_MVIEWS: refreshes all the materialized views


DBMS_OUTLN
This package contains the functional interface to manage stored outlines.
To use this package the EXECUTE_CATALOG_ROLE role is needed. There is also a public
synonym OUTLN_PKG.

Procedures
The most relevant procedures are:
CLEAR_USED: clears the outline "used" flag
DROP_BY_CAT: drops outlines which belong to a specific category
UPDATE_BY_CAT: updates the category of outlines to a new category
DROP_UNUSED: drops outlines never applied in the compilation of a SQL statement

DBMS_OUTLN_EDIT
This package contains the functional interface to manage stored outlines.
The public role has execute privileges on DBMS_OUTLN_EDIT, which is defined with
invoker's rights.
Procedures
The most relevant procedures are:
CREATE_EDIT_TABLES: creates outline editing tables in calling a user's schema;
beginning from Oracle 10g, you will not need to use this procedure because the
outline editing tables are part—as temporary tables—of the SYSTEM schema
REFRESH_PRIVATE_OUTLINE: refreshes the in-memory copy of the outline,
synchronizing its data with the edits made to the outline hints
DROP_EDIT_TABLES: drops the outline editing tables from the calling user's schema

DBMS_SHARED_POOL
This package allows access to information about sizes of the objects stored in the shared
pool and marks them for keeping or not-keeping.
Procedures
The most relevant procedures are:
KEEP: keeps an object in the shared pool, so it isn't subject to aging
UNKEEP: unkeeps an object from the shared pool
PURGE: purges the object
SIZES: shows objects in the shared pool larger than the specified size


DBMS_SPACE
This package enables the analysis of segment growth and space requirements.
Procedures
The most relevant procedures are:
CREATE_TABLE_COST: determines the size of a table
CREATE_INDEX_COST: determines the size of an index
FREE_BLOCKS: returns information about free blocks in an object
SPACE_USAGE: returns information about free blocks in a segment
managed by automatic space management



DBMS_SPM
This package provides an interface to manipulate plan history and SQL plan baselines.
Procedures
The most relevant procedures are:
LOAD_PLANS_FROM_CURSOR_CACHE: loads one or more plans from
the cursor cache for a SQL statement
LOAD_PLANS_FROM_SQLSET: loads plans stored in a SQL tuning set into
SQL plan baselines
EVOLVE_SQL_PLAN_BASELINE: evolves SQL plan baselines associated with
one or more SQL statements, changing them to accepted if they are found to be
better than the SQL plan baseline performance and if the user asks such action
DROP_SQL_PLAN_BASELINE: drops a single plan or all the plans associated
with a SQL statement


DBMS_SQL
This package provides an interface to use dynamic SQL to parse both DML and DDL
statements using PL/SQL.

Procedures
The most relevant procedures are:
EXECUTE: executes a cursor
OPEN_CURSOR: returns the cursor ID number of the new cursor
PARSE: parses the given statement
BIND_VARIABLE: binds a given value to a given variable
CLOSE_CURSOR: closes a given cursor and frees associated memory


DBMS_SQLTUNE
This package provides an interface to tune SQL statements.
Procedures
The most relevant procedures related to the SQL tuning set are:
CREATE_SQLSET: creates a SQL tuning set object in the database
DROP_SQLSET: drops a SQL tuning set if not active
SELECT_SQLSET: collects SQL statements from an existing SQL tuning set
LOAD_SQLSET: populates the SQL tuning set with a set of selected SQL statements
SELECT_CURSOR_CACHE: collects SQL statements from the cursor cache
The most relevant procedures to manage SQL tuning tasks are:
CREATE_TUNING_TASK: creates a tuning of a single statement or tuning set
EXECUTE_TUNING_TASK: executes a previously created tuning task
REPORT_TUNING_TASK: displays the results of a tuning task
INTERRUPT_TUNING_TASK: interrupts the currently executing tuning task
RESUME_TUNING_TASK: resumes a previously interrupted tuning task



DBMS_STATS
This package allows you to view and modify optimizer statistics.

Procedures
The most relevant procedures are:
GATHER_SCHEMA_STATS: gathers optimizer statistics for a schema class
GATHER_DATABASE_STATS: gathers optimizer statistics for a database class
GATHER_TABLE_STATS: gathers table statistics
GATHER_INDEX_STATS: gathers index statistics
CREATE_STAT_TABLE: creates the user statistics table
DROP_STAT_TABLE: drops the user statistics table
EXPORT_SCHEMA_STATS: exports schema statistics to a user statistics table
IMPORT_SCHEMA_STATS: import schema statistics from a user statistics table


DBMS_UTILITY
This package provides various utility subprograms.
Procedures
The most relevant procedures are:
ANALYZE_SCHEMA: analyzes all the tables, indexes, and clusters in a schema
ANALYZE_DATABASE: analyzes all the tables, indexes, and clusters in a database
GET_TIME: returns the current time in hundredths of a second

DBMS_WORKLOAD_REPOSITORY
This package allows management of Workload Repository.
Procedures
The most relevant procedures are:
CREATE_SNAPSHOT: creates a manual snapshot
MODIFY_SNAPSHOT_SETTINGS: modifies the snapshot settings
CREATE_BASELINE: creates a single baseline







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