cache参数告诉oracle预先分配一个sequence numbers的集合,并且保留在内存中,以便sequence number能够被快速的访问。这个内存的大小就是cache所指定的大小,当多个用户同时访问一个sequence的时候,是在oracle SGA中读取sequence当前的合理数值,如果并发访问太大,cache的大小不够,那么就会产生sequence cache相关的等待(enq: SQ ...
procedure compileSchema( schemaURL IN varchar2); generateSchema() Description These functions generate XML schema(s) from an oracle type name. Can result in aORA-31001exception: invalid resource handle or path name. The available options are given in the following table. Catalog Views Table 28-...
Answer:In a database, a table (or “concrete table”) contains its data in columns and rows. Whereas a view (virtual table) is constructed over the actual table or tables from which it retrieves data; it doesn’t keep any of its data in the database. Only the SQL query that was u...
Steven Feuerstein, one of the industry’s best-respected and most prolific experts in PL/SQL, wrote a 12-part tutorial series on the language. Those articles, first published in 2011, have been among the most popular ever published on the Oracle website and continue to find new readers and...
OracleAS Portal PL/SQL API Reference: Secured Logging Viewswwlogapiadmin
Thus, a local index made up of four partitions is not stored in a single index segment, but in four separate segments. See Also: Oracle Database SQL Language Reference for CREATE INDEX ... LOCAL examples Global Partitioned Indexes A global partitioned index is a B-tree index that is ...
Query v$pga_target_Advice : V_pga_target_Advice « System Tables Views « Oracle PL / SQL Query v$pga_target_Advice SQL> select pga_target_for_estimate as target, 2 estd_pga_cache_hit_percentage as cache_hit_perc, 3 estd_overalloc_count as est_overalloc 4 from v$pga_target_Advice...
So lets first create a directory in Oracle 1 2 3 SQL> create directory data_pump as '/u01/export'; directory created. Grant the required privileges to the user performing the export so that the user can read from and write to the directory location. 1 2 3 SQL> grant read, write on ...
SQL Plus Stored Procedure Function Subquery System Packages System Tables Views Table Table Joins Trigger User Previliege View XMLselect column_name, comments from user_col_comments : user_col_comments « System Tables Views « Oracle PL / SQL ...
Oracle functionEMPTY_BLOBthat creates an empty BLOB values is convered into MS SQL formatlike this FunctionEMPTY_CLOBthat creates an empty CLOB or NCLOB values must be replaced by emty string '' in SQL Server Oracle'sCONCAT($s1, $s2)function returns $s2 appended or concatenated to $s1. ...