1.首先获得library cache latch,根据SQL的HASH_VALUE在library cache中查找是否存在此HASH_VALUE,如果找到这个HASH_VALUE,称之为软解析,Server获得改SQL执行计划转向第4步,如果找不到共享代码就进行硬解析。 2.释放library pool cache,获得shared pool latch,查找并锁定自由空间
8 3 TABLE ACCESS (FULL) OF 'SO_TYPE' (Cost=1 Card=128 Bytes=2176) 9 2 TABLE ACCESS (BY INDEX ROWID) OF 'SO_HANDLE' (Cost=4 Card=280 Bytes=5600) 10 9 INDEX (RANGE SCAN) OF 'PK_SO_HANDLE' (UNIQUE) (Cost=3 Card=280) 11 1 TABLE ACCESS (BY INDEX ROWID) OF 'CTRL_ASGN' ...
4 3 NESTED LOOPS (Cost=31 Card=30 Bytes=1620) 5 4 TABLE ACCESS (FULL) OF 'STATUS' (Cost=2 Card=1 Bytes=25) 6 4 TABLE ACCESS (BY INDEX ROWID) OF 'SO' (Cost=29 Card=59 Bytes=1711) 7 6 INDEX (RANGE SCAN) OF 'SO_0003' (NON-UNIQUE) (Cost=2 Card=59) 8 3 TABLE ACCESS ...
# #Each line describes a limit for a user in the form: # # # #Where: # can be: # - a user name # - a group name, with @group syntax # - the wildcard *, for default entry # - the wildcard %, can be also used with %group syntax, # for maxlogin limit # # can have ...
To use QuickFilter » On the left side of the Schema Browser, enter a filter string in the QuickFilter field (look for a field containing a single asterisk). You can use wildcard characters at any point in your filter. You can use wildcard characters at any point in your filter. ...
10SORT(ORDER BY)(Cost=2 Card=100 Bytes=400) 21 INDEX (RANGE SCAN) OF 'IND_BT' (NON-UNIQUE) (Cost=2 Card=100 Bytes=400) 这里优化器首先选择了一个索引范围扫描,然后还有一个排序的步骤。如果使用了降序索引,排序的过程会被取消。 SQL> create index test.ind_desc on test.testrev(a desc,b...
Oracle® Configurator Developer User's Guide Release 11i Part No. B10614-01 Februrary 2003 This document describes how to build and deploy configuration models using Oracle Configurator Developer. Oracle Configurator Developer User's Guide, Release 11i Part No. B10614-01 Copyright © 1999, ...
Use the list of SQL, PL/SQL, and SQL*Plus keywords when appropriate. Do a title search, if the number of matching titles is small enough to find the right topic. If you do use a full-text search, surround the term with curly braces, such as{FROM}. This will prevent wildcard expans...
由于SQL返回LODGING列,而它并不存在于LODGING$MANAGER索引中, 所以在索引范围查询后会执行一个通过ROWID访问表的操作. WHERE子句中, 如果索引列所对应的值的第一个字符由通配符(WILDCARD)开始, 索引将不被采用. SELECT LODGING FROM LODGING WHERE MANAGER LIKE ￡￥HANMAN; 在这种情况下,ORACLE将使用全表扫描. ...
5 Text: Wildcard Search Oracle 18c 支持通配符匹配。 https://www.oracle.com/pls/topic/lookup?ctx=en/database/oracle/oracle-database/18/newft&id=CCAPP-GUID-67A2ACB4-FB50-4EEB-9DC0-58BDA85014BA PostgreSQL 8.3+ (2008 year+) 严格来说,PostgreSQL 8.2以前的版本已经支持了通配符搜索,(支持正则...