All that we do on the database is recorded inside the static data dictionary tables. Data dictionary tables are not directly accessible, and we query them through data dictionary views. It takes time to know the details of each view but in the end it gives you the freedom to keep under the control the following:
- schema objects
- schema objects VALID status
- the amount of the consumed resources by the schema objects
- the dependencies between schema objects
- the granted privileges on schema objects
Many data dictionary tables have three corresponding views:
- ALL_ view
- DBA_ view
- USER_ view
An ALL_ view displays all the information accessible to the current user, which includes information from the current user’s schema, information from objects in other schemas, if the access to those objects is granted through privileges or roles to the current user.
A DBA_ view displays all information in the entire database. DBA_ views are accessible only by administrators.
They can be accessed by less privileged users if they are granted the SELECT ANY TABLE privilege.
This privilege is assigned to the DBA role when the system is initially installed.
A USER_ view displays all the information from the schema of the current user. No special privileges are required to query these views.
The columns of the ALL_, DBA_, and USER_ views corresponding to a single data dictionary table are nearly identical.
Each user should query the view DICTIONARY to know what views are available to him.
In my current Oracle Database 11g2, the DBA can access 2551 views:
sys@XE> select count(*) from dictionary;
COUNT(*)
----------
2551
If I create a new schema ANA
sys@XE> create user ana identified by swdev 2 default tablespace USERS 3 temporary tablespace TEMP; User created. sys@XE> alter user ana identified by swdev account unlock; User altered. sys@XE> grant connect, resource to ana; Grant succeeded.
and if I connect to the database as the user ANA/SWDEV, I can access 804 views.
ana@XE> select count(*) from dictionary;
COUNT(*)
----------
804
ana@XE> desc dictionary
Name Null? Type
----------------- -------- ----------------
TABLE_NAME VARCHAR2(30)
COMMENTS VARCHAR2(4000)
Only 689 views have a comment.
ana@XE> select count(comments) from dictionary;
COUNT(COMMENTS)
---------------
689
How many of ALL_ , DBA_, and USER_ views can I access?
ana@XE> select count(*) from dictionary where table_name like 'ALL%';
COUNT(*)
----------
339
ana@XE> select count(*) from dictionary where table_name like 'DBA%';
COUNT(*)
----------
0
ana@XE> select count(*) from dictionary where table_name like 'USER%';
COUNT(*)
----------
361
I can not access DBA_ views, but I can access 339 ALL_ views and 361 USER_ views.
What USER_TAB_ views can I access?
ana@XE> select * from dictionary where table_name like 'USER_TAB%' and comments is not null and rownum < 6 order by 1; TABLE_NAME ------------------------------ COMMENTS ------------------------------ USER_TABLES Description of the user's own relational tables USER_TABLESPACES Description of accessible tablespaces USER_TAB_COLS Columns of user's tables, views and clusters USER_TAB_COLUMNS Columns of user's tables, views and clusters USER_TAB_COL_STATISTICS Columns of user's tables, views and clusters
The list of USER_ views that I usually query during the day is presented in the table of the post published on July, 21 2015.
If you want to know more about static dictionary views, the Oracle Database Reference Guide is listed under the reference [ref13].
WHY and HOW do I use static data dictionary views?
I want to know what schema objects are already in my schema.
ana@XE> select object_name 2 , object_type 3 , created 4 , status 5 , temporary 6 , namespace 7 from user_objects; no rows selected
As I have been a new user to the database, there is no schema objects in my schema ANA.
I can copy create statements from the existing schema and add some objects to my schema.
ana@XE> select object_type, count(*) total 2 from user_objects 3 group by object_type 4 order by 1; OBJECT_TYPE TOTAL ------------------- ---------- FUNCTION 1 LOB 2 SEQUENCE 1 TABLE 1 TRIGGER 1
I created 1 function, 2 LOB objects, 1 sequence, 1 table, and 1 trigger.
What are their names?
ana@XE> select object_name 2 , object_type 3 , created 4 , status 5 , temporary 6 , namespace 7 from user_objects; OBJECT_NAME -------------------------------------------------------- OBJECT_TYPE CREATED STATUS T NAMESPACE ------------------- ----- ------ - ---------- FUNCT_GET_DDL FUNCTION 23-JUL-15 VALID N 1 TWEETS TABLE 23-JUL-15 VALID N 1 SYS_LOB0000020438C00003$$ LOB 23-JUL-15 VALID N 8 SYS_LOB0000020438C00002$$ LOB 23-JUL-15 VALID N 8 TWEETS_SEQ SEQUENCE 23-JUL-15 VALID N 1 TWEETS_TR_INSERT TRIGGER 23-JUL-15 VALID N 3 6 rows selected.
From here, I can easily query USER_ views and learn more about existing schema objects.
ana@XE> select * from user_tables;
TABLE_NAME TABLESPACE_NAME CLUSTER_NAME
------------------------------ ------------------------------ ------------------------------
IOT_NAME STATUS PCT_FREE PCT_USED INI_TRANS MAX_TRANS INITIAL_EXTENT
------------------------------ -------- ---------- ---------- ---------- ---------- --------------
NEXT_EXTENT MIN_EXTENTS MAX_EXTENTS PCT_INCREASE FREELISTS FREELIST_GROUPS LOG B NUM_ROWS
----------- ----------- ----------- ------------ ---------- --------------- --- - ----------
BLOCKS EMPTY_BLOCKS AVG_SPACE CHAIN_CNT AVG_ROW_LEN AVG_SPACE_FREELIST_BLOCKS
---------- ------------ ---------- ---------- ----------- -------------------------
NUM_FREELIST_BLOCKS DEGREE
------------------- ----------------------------------------
INSTANCES CACHE TABLE_LO SAMPLE_SIZE LAST_ANAL PAR
---------------------------------------- -------------------- -------- ----------- --------- ---
IOT_TYPE T S NES BUFFER_ FLASH_C CELL_FL ROW_MOVE GLO USE DURATION SKIP_COR MON
------------ - - --- ------- ------- ------- -------- --- --- --------------- -------- ---
CLUSTER_OWNER DEPENDEN COMPRESS COMPRESS_FOR DRO REA SEG RESULT_
------------------------------ -------- -------- ------------ --- --- --- -------
TWEETS USERS
VALID 10 1 255 65536
1048576 1 2147483645 YES N
1
1 N ENABLED NO
N N NO DEFAULT DEFAULT DEFAULT DISABLED NO NO DISABLED YES
DISABLED DISABLED NO NO YES DEFAULT
The table Tweets is created in the tablespace USERS, it does not belong to any cluster, and it is VALID.
ana@XE> select table_name, comments from user_tab_comments; TABLE_NAME COMMENTS ------------------------------------------------------ TWEETS Tweets table contains tweets and their attached photos ana@XE> select * from user_col_comments; TABLE_NAME COLUMN_NAME ------------------------------ ----------------- COMMENTS ------------------------------------------------ TWEETS ID The ID is the identification number of the tweet. TWEETS TEXT The content of the tweet. TWEETS PHOTO The photo attached to the tweet.
Tweets table has 3 columns, ID, TEXT, and PHOTO.
ana@XE> select table_name, column_name, substr(data_type, 1, 8) data_type from user_tab_cols; TABLE_NAME COLUMN_NAME DATA_TYPE ---------- ----------- ------------- TWEETS ID NUMBER TWEETS TEXT CLOB TWEETS PHOTO BLOB
Tweets table columns are of CLOB and BLOB data types.
ana@XE> select * from user_sequences;
SEQUENCE_NAME MIN MAX INC C O CACHE_SIZE LAST_NUMBER
------------ ---- ---------- --- - - ---------- -----------
TWEETS_SEQ 1 1.0000E+28 1 N N 0 1
ana@XE> select * from user_triggers;
TRIGGER_NAME TRIGGER_TYPE
------------------------------ ----------------
TRIGGERING_EVENT
----------------------------------------------------------------------------------------------------
TABLE_OWNER BASE_OBJECT_TYPE TABLE_NAME
------------------------------ ---------------- ------------------------------
COLUMN_NAME
----------------------------------------------------------------------------------------------------
REFERENCING_NAMES
----------------------------------------------------------------------------------------------------
WHEN_CLAUSE
----------------------------------------------------------------------------------------------------
STATUS
--------
DESCRIPTION
----------------------------------------------------------------------------------------------------
ACTION_TYPE TRIGGER_BODY CROSSED
----------- -------------------------------------------------------------------------------- -------
BEF BEF AFT AFT INS FIR APP
--- --- --- --- --- --- ---
TWEETS_TR_INSERT BEFORE EACH ROW
INSERT
ANA TABLE TWEETS
REFERENCING NEW AS NEW OLD AS OLD
ENABLED
"ANA"."TWEETS_TR_INSERT"
BEFORE INSERT ON tweets
FOR EACH ROW
PL/SQL BEGIN NO
SELECT tweets_seq.nextval INTO :new.ID FROM DUAL;
END;
NO NO NO NO NO YES NO
The trigger TWEETS_TR_INSERT will fire on insert on the table TWEETS for each row, it is valid, and its body is listed in the column TRIGGER_BODY.
ana@XE> select * from user_procedures;
OBJECT_NAME
----------------------------------------------------------------------------------------------------
PROCEDURE_NAME OBJECT_ID SUBPROGRAM_ID OVERLOAD
------------------------------ ---------- ------------- ----------------------------------------
OBJECT_TYPE AGG PIP IMPLTYPEOWNER IMPLTYPENAME PAR INT
------------------- --- --- ------------------------------ ------------------------------ --- ---
DET AUTHID
--- ------------
FUNCT_GET_DDL
20434 1
FUNCTION NO NO NO NO
NO CURRENT_USER
TWEETS_TR_INSERT
20444 1
TRIGGER NO NO NO NO
NO DEFINER
My schema contains two PL/SQL subprograms, one function FUNCT_GET_DDL, and one trigger TWEETS_TR_INSERT.
Below, the source code of both PL/SQL subprograms is listed.
ana@XE> select text from all_source where owner = 'ANA'; TEXT ---------------------------------------------------------------------------------------------------- FUNCTION "FUNCT_GET_DDL" ( p_in_type VARCHAR2 , p_in_schema VARCHAR2 , p_in_name VARCHAR2 ) RETURN CLOB AUTHID CURRENT_USER IS -- Define local variables. l_h NUMBER; --handle returned by OPEN l_th NUMBER; -- handle returned by ADD_TRANSFORM l_doc CLOB; --returned sql ddl statement BEGIN -- Specify the object type. l_h := DBMS_METADATA.OPEN(p_in_type); -- Use filters to specify the particular object desired. DBMS_METADATA.SET_FILTER(l_h,'SCHEMA',p_in_schema); DBMS_METADATA.SET_FILTER(l_h,'NAME',p_in_name); -- Request that the metadata be transformed into creation DDL. l_th := DBMS_METADATA.ADD_TRANSFORM(l_h,'DDL'); -- Fetch the object. l_doc := DBMS_METADATA.FETCH_CLOB(l_h); -- Release resources. DBMS_METADATA.CLOSE(l_h); -- Return the result RETURN l_doc; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE(SQLERRM); END; TRIGGER "ANA"."TWEETS_TR_INSERT" BEFORE INSERT ON tweets FOR EACH ROW BEGIN SELECT tweets_seq.nextval INTO :new.ID FROM DUAL; END; 51 rows selected.
There are other useful USER_ views about table columns. From the USER_UPDATABLE_COLUMNS we can see what columns we can UPDATE.
ana@XE> select * from user_updatable_columns; OWNER TABLE_NAME COLUMN_NAME UPD INS DEL --------- ----------- ----------- --- --- --- ANA TWEETS ID YES YES YES ANA TWEETS TEXT YES YES YES ANA TWEETS PHOTO YES YES YES
The view USER_TRIGGER_COLS tells us that the trigger TWEETS_TR_INSERT inserts new value to the column TWEETS.ID.
ana@XE> select * from user_trigger_cols; TRIGGER_OWNER TRIGGER_NAME TABLE_OWNER ------------------------------ ------------------------------ ------------------------------ TABLE_NAME ------------------------------ COLUMN_NAME ---------------------------------------------------------------------------------------------------- COL COLUMN_USAGE --- ----------------- ANA TWEETS_TR_INSERT ANA TWEETS ID NO NEW OUT
If we wanted to know what resources our table consumes, there are two useful views, USER_TABLESPACES and USER_SEGMENTS.
ana@XE> select * from user_tablespaces;
TABLESPACE_NAME BLOCK_SIZE INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS MAX_EXTENTS
------------------------------ ---------- -------------- ----------- ----------- -----------
MAX_SIZE PCT_INCREASE MIN_EXTLEN STATUS CONTENTS LOGGING FOR EXTENT_MAN ALLOCATIO SEGMEN
---------- ------------ ---------- --------- --------- --------- --- ---------- --------- ------
DEF_TAB_ RETENTION BIG PREDICA ENC COMPRESS_FOR
-------- ----------- --- ------- --- ------------
SYSTEM 8192 65536 1 2147483645
2147483645 65536 ONLINE PERMANENT LOGGING NO LOCAL SYSTEM MANUAL
DISABLED NOT APPLY NO HOST NO
SYSAUX 8192 65536 1 2147483645
2147483645 65536 ONLINE PERMANENT LOGGING NO LOCAL SYSTEM AUTO
DISABLED NOT APPLY NO HOST NO
UNDOTBS1 8192 65536 1 2147483645
2147483645 65536 ONLINE UNDO LOGGING NO LOCAL SYSTEM MANUAL
DISABLED NOGUARANTEE NO HOST NO
TEMP 8192 1048576 1048576 1
2147483645 0 1048576 ONLINE TEMPORARY NOLOGGING NO LOCAL UNIFORM MANUAL
DISABLED NOT APPLY NO HOST NO
USERS 8192 65536 1 2147483645
2147483645 65536 ONLINE PERMANENT LOGGING NO LOCAL SYSTEM AUTO
DISABLED NOT APPLY NO HOST NO
ana@XE> select * from user_segments;
SEGMENT_NAME
---------------------------------------------------------------------------------
PARTITION_NAME SEGMENT_TYPE SEGMENT_SU TABLESPACE_NAME
------------------------------ ------------------ ---------- ------------------------------
BYTES BLOCKS EXTENTS INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS MAX_EXTENTS MAX_SIZE
---------- ---------- ---------- -------------- ----------- ----------- ----------- ----------
RETENTI MINRETENTION PCT_INCREASE FREELISTS FREELIST_GROUPS BUFFER_ FLASH_C CELL_FL
------- ------------ ------------ ---------- --------------- ------- ------- -------
TWEETS
TABLE ASSM USERS
65536 8 1 65536 1048576 1 2147483645 2147483645
DEFAULT DEFAULT DEFAULT
SYS_IL0000020438C00002$$
LOBINDEX ASSM USERS
65536 8 1 65536 1048576 1 2147483645 2147483645
DEFAULT DEFAULT DEFAULT
SYS_IL0000020438C00003$$
LOBINDEX ASSM USERS
65536 8 1 65536 1048576 1 2147483645 2147483645
DEFAULT DEFAULT DEFAULT
SYS_LOB0000020438C00002$$
LOBSEGMENT ASSM USERS
65536 8 1 65536 1048576 1 2147483645 2147483645
DEFAULT DEFAULT DEFAULT
SYS_LOB0000020438C00003$$
LOBSEGMENT ASSM USERS
65536 8 1 65536 1048576 1 2147483645 2147483645
DEFAULT DEFAULT DEFAULT
From the view USER_SEGMENTS, we can see that our table TWEETS is inside the segment TWEETS, and the segment belongs to the tablespace USERS.
The SQL statement CREATE TABLE TWEETS created two LOBSEGMENT segments, one for the column TEXT, and the other for the column PHOTO, and also it created two LOBINDEX segments, one for the column TEXT, and the other for the column PHOTO.
If we need more information about each column of the table TWEETS, we will query the view USER_TAB_COLS or USER_TAB_COLUMNS.
ana@XE> select * from user_tab_columns where COLUMN_NAME = 'TEXT';
TABLE_NAME COLUMN_NAME
------------------------------ ------------------------------
DATA_TYPE
----------------------------------------------------------------------------------------------------
DAT
---
DATA_TYPE_OWNER
----------------------------------------------------------------------------------------------------
DATA_LENGTH DATA_PRECISION DATA_SCALE N COLUMN_ID DEFAULT_LENGTH
----------- -------------- ---------- - ---------- --------------
DATA_DEFAULT NUM_DISTINCT
-------------------------------------------------------------------------------- ------------
LOW_VALUE
----------------------------------------------------------------
HIGH_VALUE DENSITY NUM_NULLS NUM_BUCKETS
---------------------------------------------------------------- ---------- ---------- -----------
LAST_ANAL SAMPLE_SIZE CHARACTER_SET_NAME CHAR_COL_DECL_LENGTH GLO USE
--------- ----------- -------------------------------------------- -------------------- --- ---
AVG_COL_LEN CHAR_LENGTH C V80 DAT HISTOGRAM
----------- ----------- - --- --- ---------------
TWEETS TEXT
CLOB
4000 Y 2
CHAR_CS 4000 NO NO
0 NO YES NONE
ana@XE> select * from user_tab_columns where COLUMN_NAME = 'PHOTO';
TABLE_NAME COLUMN_NAME
------------------------------ ------------------------------
DATA_TYPE
----------------------------------------------------------------------------------------------------
DAT
---
DATA_TYPE_OWNER
----------------------------------------------------------------------------------------------------
DATA_LENGTH DATA_PRECISION DATA_SCALE N COLUMN_ID DEFAULT_LENGTH
----------- -------------- ---------- - ---------- --------------
DATA_DEFAULT NUM_DISTINCT
-------------------------------------------------------------------------------- ------------
LOW_VALUE
----------------------------------------------------------------
HIGH_VALUE DENSITY NUM_NULLS NUM_BUCKETS
---------------------------------------------------------------- ---------- ---------- -----------
LAST_ANAL SAMPLE_SIZE CHARACTER_SET_NAME CHAR_COL_DECL_LENGTH GLO USE
--------- ----------- -------------------------------------------- -------------------- --- ---
AVG_COL_LEN CHAR_LENGTH C V80 DAT HISTOGRAM
----------- ----------- - --- --- ---------------
TWEETS PHOTO
BLOB
4000 Y 3
NO NO
0 NO YES NONE
The CREATE TABLE TWEETS statement also created indexes for both LOB columns.
ana@XE> select * from user_indexes;
INDEX_NAME INDEX_TYPE TABLE_OWNER
------------------------------ --------------------------- ------------------------------
TABLE_NAME TABLE_TYPE UNIQUENES COMPRESS PREFIX_LENGTH
------------------------------ ----------- --------- -------- -------------
TABLESPACE_NAME INI_TRANS MAX_TRANS INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS
------------------------------ ---------- ---------- -------------- ----------- -----------
MAX_EXTENTS PCT_INCREASE PCT_THRESHOLD INCLUDE_COLUMN FREELISTS FREELIST_GROUPS PCT_FREE LOG
----------- ------------ ------------- -------------- ---------- --------------- ---------- ---
BLEVEL LEAF_BLOCKS DISTINCT_KEYS AVG_LEAF_BLOCKS_PER_KEY AVG_DATA_BLOCKS_PER_KEY
---------- ----------- ------------- ----------------------- -----------------------
CLUSTERING_FACTOR STATUS NUM_ROWS SAMPLE_SIZE LAST_ANAL DEGREE
----------------- -------- ---------- ----------- --------- ----------------------------------------
INSTANCES PAR T G S BUFFER_ FLASH_C CELL_FL USE DURATION
---------------------------------------- --- - - - ------- ------- ------- --- ---------------
PCT_DIRECT_ACCESS ITYP_OWNER ITYP_NAME
----------------- ------------------------------ ------------------------------
PARAMETERS
----------------------------------------------------------------------------------------------------
GLO DOMIDX_STATU DOMIDX FUNCIDX_ JOI IOT DRO VISIBILIT DOMIDX_MANAGEM SEG
--- ------------ ------ -------- --- --- --- --------- -------------- ---
SYS_IL0000020438C00002$$ LOB ANA
TWEETS TABLE UNIQUE DISABLED
USERS 2 255 65536 1048576 1
2147483645 10 YES
VALID 0
0 NO N Y N DEFAULT DEFAULT DEFAULT NO
NO NO NO NO VISIBLE YES
SYS_IL0000020438C00003$$ LOB ANA
TWEETS TABLE UNIQUE DISABLED
USERS 2 255 65536 1048576 1
2147483645 10 YES
VALID 0
0 NO N Y N DEFAULT DEFAULT DEFAULT NO
NO NO NO NO VISIBLE YES
The view USER_LOBS shows all details about table TWEETS LOB columns TEXT and PHOTO.
ana@XE> select * from user_lobs;
TABLE_NAME
------------------------------
COLUMN_NAME
----------------------------------------------------------------------------------------------------
SEGMENT_NAME TABLESPACE_NAME INDEX_NAME
------------------------------ ------------------------------ ------------------------------
CHUNK PCTVERSION RETENTION FREEPOOLS CACHE LOGGING ENCR COMPRE DEDUPLICATION IN_
---------- ---------- ---------- ---------- ---------- ------- ---- ------ --------------- ---
FORMAT PAR SEC SEG RETENTI RETENTION_VALUE
--------------- --- --- --- ------- ---------------
TWEETS
TEXT
SYS_LOB0000020438C00002$$ USERS SYS_IL0000020438C00002$$
8192 900 NO YES NONE NONE NONE YES
ENDIAN NEUTRAL NO NO YES YES
TWEETS
PHOTO
SYS_LOB0000020438C00003$$ USERS SYS_IL0000020438C00003$$
8192 900 NO YES NONE NONE NONE YES
NOT APPLICABLE NO NO YES YES
If we query USER_LOBS for the specific information about LOBs, such as
- if it is a BASICFILE or SECUREFILE
- whether or not the LOB is encrypted
- for SecureFiles: YES or NO
- for BasicFiles: NONE – Not applicable
- the level of compression used for the LOB
- for SecureFiles: LOW, MEDIUM, HIGH, NO
- for BasicFiles: NONE – Not applicable
- kind of deduplication used for this LOB
- for SecureFiles: LOB – Deduplicate, NO – Keep duplicates
- for BasicFiles: NONE – Not applicable
we will do it with the following statement:
ana@XE> select table_name 2 , column_name 3 , segment_name 4 , tablespace_name 5 , index_name 6 , cache 7 , logging 8 , securefile 9 , compression 10 , deduplication 11 , encrypt 12 from user_lobs; TABLE_NAME ------------------------------ COLUMN_NAME ---------------------------------------------------------------------------------------------------- SEGMENT_NAME TABLESPACE_NAME INDEX_NAME ------------------------------ ------------------------------ ------------------------------ CACHE LOGGING SEC COMPRE DEDUPLICATION ENCR ---------- ------- --- ------ --------------- ---- TWEETS TEXT SYS_LOB0000020438C00002$$ USERS SYS_IL0000020438C00002$$ NO YES NO NONE NONE NONE TWEETS PHOTO SYS_LOB0000020438C00003$$ USERS SYS_IL0000020438C00003$$ NO YES NO NONE NONE NONE
Both LOBs, TEXT and PHOTO, are BASICFILEs, they are not compressed, deduplicated or encrypted.
And finally, we should know what schema objects are dependent on.
The function FUNCT_GET_DDL depends on the packages STANDARD, DBMS_METADATA, DBMS_OUTPUT, SYS_STUB_FOR_PURITY_ANALYSIS, and DBMS_LOB.
The trigger TWEETS_TR_INSERT depends on the package STANDARD, the tables DUAL and TWEETS, and the sequence TWEETS_SEQ.
ana@XE> select * from user_dependencies;
NAME TYPE REFERENCED_OWNER
------------------------------ ------------------ ------------------------------
REFERENCED_NAME REFERENCED_TYPE
---------------------------------------------------------------- ------------------
REFERENCED_LINK_NAME
----------------------------------------------------------------------------------------------------
SCHEMAID DEPE
---------- ----
FUNCT_GET_DDL FUNCTION SYS
STANDARD PACKAGE
49 HARD
FUNCT_GET_DDL FUNCTION PUBLIC
DBMS_METADATA SYNONYM
49 HARD
FUNCT_GET_DDL FUNCTION PUBLIC
DBMS_OUTPUT SYNONYM
49 HARD
FUNCT_GET_DDL FUNCTION SYS
SYS_STUB_FOR_PURITY_ANALYSIS PACKAGE
49 HARD
FUNCT_GET_DDL FUNCTION SYS
DBMS_LOB PACKAGE
49 HARD
TWEETS_TR_INSERT TRIGGER SYS
STANDARD PACKAGE
49 HARD
TWEETS_TR_INSERT TRIGGER PUBLIC
DUAL SYNONYM
49 HARD
TWEETS_TR_INSERT TRIGGER ANA
TWEETS TABLE
49 HARD
TWEETS_TR_INSERT TRIGGER ANA
TWEETS_SEQ SEQUENCE
49 HARD
9 rows selected.
SUMMARY
The Oracle Database is a complex system that contains many information inside itself.
The static data dictionary views collect all actions on the schema objects and it is necessary to know them better as that knowledge increases a developer productivity in everyday work.
REFERENCE
[ref13]Oracle® Database Reference 11g Release 2 (11.2) E25513-04
I hope this will be useful for anyone who would like to learn more about Oracle Database.
Thank you for visiting my blog!
Have a nice day!
P.S. Keep climbing Mount Olympus ( I mean keep learning and make things happen ) !
Climbing Olympus 