Transaction on table with index
Hello!Is it possible - the blocking of entire index block for "enq: TX - line lock conflict" on the table (in the case of table organized bunch)
in other words, if blocking a row in the table causes blocking of any block of an index?
Thank you and best regards,
Pavel
Published by: Pavel on 3 may 2012 12 h 30
Pavel wrote:
Hello!Is it possible - the blocking of entire index block for "enq: TX - line lock conflict" on the table (in the case of table organized bunch)
in other words, if blocking a row in the table causes blocking of any block of an index?
You must use the words with great care in this case. The answer to your question is no - the "index block' is not 'blocked' when you see a ' enq: TX - line lock conflict. Some characteristics of the data manipulated by a transaction requires another transaction to wait for the first transaction to the commit or rollback. When track down you the TX lock and he expects in lmode 4, there are several possible causes - many of them associated with index, or index organized table or referential integrity. (There are a couple of management of space related inside - but most of these appear with a different expectation.)
If you are "updated" an index entry you actually remove a single entry and insert another - another session could end up waiting at EACH end of this process for you. Generally, it will be on the unique constraints - the other process might want to of "re - insert" line you just deleted and must wait to make sure that you do not have rear roller, or she might want to insert the value you insert - in which case he must wait in case you commit (and must raise the "double key") or restore you (and it can go forward).
There are many other combinations of simultaneous action - but I'll leave this as an exercise for you or other readers, to work on.
Concerning
Jonathan Lewis
Tags: Database
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-- table, data, altered text index: CREATE TABLE t_test (col1 NUMBER PRIMARY KEY, col2 VARCHAR2 (10), col3 CLOB) / INSERT INTO t_test VALUES (1, 'A', 'test data') / CREATE INDEX i1 ON t_test (col3) INDEXTYPE IS CTXSYS.CONTEXT / ALTER INDEX i1 REBUILD PARAMETERS ('REPLACE SYNC (ON COMMIT)') / SELECT * FROM t_test WHERE CONTAINS (col3, 'test data') > 0 / -- redefinition that fails: CREATE TABLE t_test_interim (col1 NUMBER, col2 NVARCHAR2 (10), col3 CLOB) / DECLARE v_num_errors NUMBER; BEGIN DBMS_REDEFINITION.CAN_REDEF_TABLE (USER, 'T_TEST', DBMS_REDEFINITION.CONS_USE_PK); DBMS_REDEFINITION.START_REDEF_TABLE (USER, 'T_TEST', 'T_TEST_INTERIM', 'COL1 COL1,TO_NCHAR(COL2) COL2,COL3 COL3', DBMS_REDEFINITION.CONS_USE_PK); DBMS_REDEFINITION.SYNC_INTERIM_TABLE (USER, 'T_TEST', 'T_TEST_INTERIM'); DBMS_REDEFINITION.COPY_TABLE_DEPENDENTS (USER, 'T_TEST', 'T_TEST_INTERIM', DBMS_REDEFINITION.CONS_ORIG_PARAMS, TRUE, TRUE, TRUE, FALSE, v_num_errors, TRUE); DBMS_REDEFINITION.FINISH_REDEF_TABLE (USER, 'T_TEST', 'T_TEST_INTERIM'); END; / -- clean up the mess: DROP MATERIALIZED VIEW t_test_interim / DROP TABLE t_test_interim CASCADE CONSTRAINTS / BEGIN DBMS_REDEFINITION.ABORT_REDEF_TABLE (USER, 'T_TEST', 'T_TEST_INTERIM'); END; / -- drop and recreate index with all parameters without altering: DROP INDEX I1 / CREATE INDEX I1 ON T_TEST (COL3) INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS ('SYNC (ON COMMIT)') / -- redo redefinition: CREATE TABLE t_test_interim (col1 NUMBER, col2 NVARCHAR2 (10), col3 CLOB) / DECLARE v_num_errors NUMBER; BEGIN DBMS_REDEFINITION.CAN_REDEF_TABLE (USER, 'T_TEST', DBMS_REDEFINITION.CONS_USE_PK); DBMS_REDEFINITION.START_REDEF_TABLE (USER, 'T_TEST', 'T_TEST_INTERIM', 'COL1 COL1,TO_NCHAR(COL2) COL2,COL3 COL3', DBMS_REDEFINITION.CONS_USE_PK); DBMS_REDEFINITION.SYNC_INTERIM_TABLE (USER, 'T_TEST', 'T_TEST_INTERIM'); DBMS_REDEFINITION.COPY_TABLE_DEPENDENTS (USER, 'T_TEST', 'T_TEST_INTERIM', DBMS_REDEFINITION.CONS_ORIG_PARAMS, TRUE, TRUE, TRUE, FALSE, v_num_errors, TRUE); DBMS_REDEFINITION.FINISH_REDEF_TABLE (USER, 'T_TEST', 'T_TEST_INTERIM'); END; / DROP TABLE t_test_interim CASCADE CONSTRAINTS / -- results: DESC t_test COLUMN col3 FORMAT A10 SELECT * FROM t_test WHERE CONTAINS (col3, 'test data') > 0 / -- clean-up: DROP TABLE t_test /
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Hello
Is it possible to create a table with a unique index collection?
example:
declare
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Start
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Ludo
Published by: Ludock on December 10, 2009 11:36
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Explain the plan:
update statement all_rows (Cost 4) 3 update hr.temp 2 table access by index rowid table hr.temp (Cost 4, Bytes : 64 ,Cardinality 1) 1 index range scan index hr.temp_wed_to_monday (Cost 3: Cardinality 1)
Thank you guys, I would be grateful if someone provides the solution for the scenario, rather than highlight the design. Please understand someone designed to best with whatever the limits it has during this period. (and this isn't me).
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>
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Hi all
I created 3 tables and indexes, but these items do not appear in dba_segments views. Is this a normal behavior? Previously, with dictionary managed tablespace, I can specify the least possible to create, at the table/index is created. But I don't know how works the locally managed tablespace. Please do advice. Thank you much in advance.
I am using Oracle 11 g R2 (11.2.0.1.0) for Microsoft Windows (x 64), running on Windows 7.
To reproduce this problem, I created the tablespaces as follows:
CREATE TABLESPACE CUST_DATA
DATAFILE ' d:\app\asus\oradata\orcl11gr2\CUST_DATA01. DBF' SIZE 512K
AUTOEXTEND ON NEXT MAXSIZE 2000 K 256K
MANAGEMENT UNIFORM LOCAL 256K SIZE MEASURE
SEGMENT SPACE MANAGEMENT AUTO;
CREATE TABLESPACE CUST_INDX
DATAFILE ' d:\app\asus\oradata\orcl11gr2\CUST_INDX. DBF' SIZE 256K
AUTOEXTEND ON NEXT MAXSIZE 2000 K 128K
MANAGEMENT UNIFORM LOCAL 128K SIZE MEASURE
SEGMENT SPACE MANAGEMENT AUTO;
CREATE TABLE CUSTOMER_MASTER (CUST_ID VARCHAR2 (10))
CUST_NAME VARCHAR2 (30),
E-MAIL VARCHAR2 (30),
DATE OF BIRTH,
ADD_TYPE CHAR (2) CONSTRAINT CK_ADD_TYPE CHECK (ADD_TYPE ("B1", "B2", "H1", "H2")),
CRE_USER VARCHAR2 (5) DEFAULT USER,.
CRE_TIME TIMESTAMP (3) DEFAULT SYSTIMESTAMP.
MOD_USER VARCHAR2 (5).
MOD_TIME TIMESTAMP (3),
CONSTRAINT PK_CUSTOMER_MASTER PRIMARY KEY (CUST_ID) USING INDEX TABLESPACE CUST_INDX)
TABLESPACE CUST_DATA;
SQL > SELECT TABLE_NAME, nom_tablespace
USER_TABLES 2
3 WHERE TABLE_NAME LIKE '% CUST. "
TABLE_NAME, TABLESPACE_NAME
------------------------------ ------------------------------
CUSTOMER_MASTER CUST_DATA
SQL > SELECT INDEX_NAME, nom_tablespace
2 FROM USER_INDEXES
3 WHERE TABLE_NAME LIKE '% CUST. "
INDEX_NAME TABLESPACE_NAME
------------------------------ ------------------------------
PK_CUSTOMER_MASTER CUST_INDX
SQL > SELECT nom_segment, SEGMENT_TYPE, nom_tablespace, BYTES
2 FROM WHERE USER_SEGMENTS;
no selected lineAn extension to what Sybrand said:
There is a parameter called differed_segment_creation, who runs the behavior.
If it is set to TRUE (the default), no segments will be allocated until you fill your table / index.
Try to insert a row. You will see your table and index in dba_segments.
See for more information
http://docs.Oracle.com/CD/E14072_01/server.112/e10595/tables002.htm
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