SELECT /*+FIRST_ROWS*/ EMP_NO,EMP_NAM,DAT_IN FROM BSEMPMS WHERE EMP_NO='SCOTT'; 3. /*+CHOOSE*/ 表明如果数据字典中有访问表的统计信息,将基于开销的优化方法,并获得最佳的吞吐量; 表明如果数据字典中没有访问表的统计信息,将基于规则开销的优化方法; 例如: SELECT /*+CHOOSE*/ EMP_NO,EMP_NAM,...
leading - remove trim_string from the front of string1. trailing - remove trim_string from the end of string1. both - remove trim_string from the front and end of string1. If none of these are chosen (ie: leading, trailing, both), the trim function will remove trim_string from both...
Oracle SQLcl (SQL Developer Command Line) is a Java-based command-line interface for Oracle Database. Using SQLcl, you can execute SQL and PL/SQL statements interactively or as as a batch file. SQLcl provides inline editing, statement completion, command recall, and also supports existing SQL...
The Oracle Database 10gPre-Upgrade Information Utility (utlu102i.sql) estimates the additional space required in theSYSTEMtablespace and in any tablespaces associated with the components that are in the database (for example, SYSAUX, DRSYS). For a manual upgrade, be sure to run this utility o...
The OracleLTRIM() functionis used to remove all specified characters from the left end side of a string. By default, it removes leading spaces, but you can specify other characters to trim. Uses of Oracle LTRIM Function Removing Leading Spaces:Cleans up strings by removing unwanted leading spac...
improve RuleCntGtThanZeroRewrite for count(*) = 0 remove concurrently for getSQL for index script disable RuleOrderEliminationInSubqueryRewrite and RuleQueryFoldingRewrite when upper block has any rownum reference fix a bug in TableReferenceHelper when the sql is like "update t1, t2 set ....
JDBC Thin client-side driver: This is a JDBC Type 4 driver that uses Java to connect directly to Oracle. It implements Oracle's SQL*Net Net8 and TTC adapters using its own TCP/IP based Java socket implementation. The JDBC Thin driver does not require Oracle client software to be installed...
Yes, both the JDBC OCI driver and the thin JDBC driver can work in both an Intranet and in an Extranet setting. In an Extranet deployment, the drivers can be used with most industry leading firewalls which have been SQL*Net certified. Today, the following firewall vendors have certified the...
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1 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 1 rows processedWe notice that even though we only delete one row from a relatively small table, we perform a large number of consistent gets (117462) due to the necessary FTS on the child table, as Oracle is forced...