Function-based index 可以很巧妙地帮助我们实现“不一般”的unique index, 但是如果没有注意function-based index对于该index对应的function的要求,很有可能会触发ORA-01802这个错误。 本文尝试去阐述这个错误是如何触发的,以及如果去解决。 OK, let’s get down to business. 记得Tom大叔的力作《Oracle编程艺术》中提...
The following statement creates a function-based index based on the UPPER function: CREATE INDEX members_last_name_fi ON members(UPPER(last_name));Code language: SQL (Structured Query Language) (sql) In this example, Oracle converted all values in the last_name column to uppercase and stored...
In general, the pros heavily out weigh any of the cons in this case. The inability to direct path load with a pl/sql based index can easily be overcome by indexing after the load with the parallel query option. The performance of inserts is only marginally affected, most applications won'...
链接:https://www.eygle.com/archives/2006/01/create_function_based_index.html 留言版上的第2330号问题是: 在oralce中给自建函数创建索引,结果不成功。 source:Create Index IDX_T_SP_TWOTYPESTAT_0_f On T_SP_TWOTYPESTAT_0(f_dateadd(yearmonth,12,2)); err:the function is not deterministic. 我们...
( <index_option> [ , ...n ] ) | [ CHECK ( logical_expression ) ] [ , ...n ] } <index_option> ::= { PAD_INDEX = { ON | OFF } | FILLFACTOR = fillfactor | IGNORE_DUP_KEY = { ON | OFF } | STATISTICS_NORECOMPUTE = { ON | OFF } | ALLOW_ROW_LOCKS = { ON | OFF ...
Column 0 was bound with a data type of SQL_C_VARBOOKMARK, and the SQL_ATTR_USE_BOOKMARKS statement attribute was not set to SQL_UB_VARIABLE. 07009 Invalid descriptor index The driver was an ODBC 2*.x* driver that does not support SQLExtendedFetch, and a column number specified in the...
( <index_option> [ , ...n ] ) | [ CHECK ( logical_expression ) ] [ , ...n ] } <index_option> ::= { PAD_INDEX = { ON | OFF } | FILLFACTOR = fillfactor | IGNORE_DUP_KEY = { ON | OFF } | STATISTICS_NORECOMPUTE = { ON | OFF } | ALLOW_ROW_LOCKS = { ON | OFF ...
SQLRETURN SQLGetInfo( SQLHDBC ConnectionHandle, SQLUSMALLINT InfoType, SQLPOINTER InfoValuePtr, SQLSMALLINT BufferLength, SQLSMALLINT * StringLengthPtr); Arguments ConnectionHandle [Input] Connection handle. InfoType [Input] Type of information. InfoValuePtr [Output] Pointer to a buffer in which...
(Function returns SQL_SUCCESS_WITH_INFO.) 08003 Connection not open (DM) The HandleType was SQL_HANDLE_DBC, and the Handle was not in a connected state. 08007 Connection failure during transaction The HandleType was SQL_HANDLE_DBC, and the connection associated with the Handle failed during ...
Feature: It returns the logarithm of log with 10 as the base and a as the index.Return type: double typelog2(double a)Feature: It returns the logarithm of log with 2 as the base and a as the index.Return type: double typemod(numeric_type a, same_type b)...