服务器受到字符后又将他转换成二进制值.存储过程就没有这些动作: 方法:Create procedure p_insert as insert into table(Fimage) values (@image), 在前台调用这个存储过程传入二进制参数,这样处理速度明显改善. 29,Between在某些时候比IN 速度更快,Between能够更快地根据索引找
FIXED_TABLE_SEQUENCE Sequence number incremented each time there has been an intervening select from a dynamic performance table ROW_WAIT_OBJ# Object identifier for table specified by ROW_WAIT_ROW# ROW_WAIT_FILE# Identifier for datafile specified in ROW_WAIT_ROW# ROW_WAIT_BLOCK# Identifier for ...
例如,一个小时以前,某个session 的FIXED_TABLE_SEQUENCE是10000,而现在是20000,则表明一个小时内其user call比较频繁,可以重点关注此session的performance statistics。 ROW_WAIT_OBJ#: 被锁定行所在table的object_id。和dba_objects中的object_id关联可以得到被锁定的table name。 ROW_WAIT_FILE#: 被锁定行所在的dat...
Performance mod_plsql Messages Standard mod_plsql Messages The following is an example of a standard mod_plsql message found in the Oracle HTTP Server error log: [Thu Jun 30 08:34:20 2005] [warn] mod_plsql: 'PlsqlCacheCleanupSize' is deprecated. The content of the standard mod_pl...
Performance and stability improvements Save layout per multi monitor setup preference added Ctrl-C did not work in the Session Window SQL Window could display an incorrect elapsed time Window List no longer brings window to front when closing a window with Shift-Click or Ctrl-Click Changing a win...
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alter table app_users add (full_name as (given_name || ' ' || family_name)); Conclusion There are two things to watch for when calling PL/SQL from SQL: The performance overhead of context switches Potentially incorrect results if the PL/SQL itself calls SQL ...
Specify the columns to be updated so that (a) anyone reading the code knows the intentions of your program, and (b) if your query contains a join of more than one table, Oracle will lock only the rows in those tables that contain any of the specified columns. ...
| PERFORMANCE_SCHEMA | ACTIVE | STORAGE ENGINE | NULL | GPL | | ARCHIVE | ACTIVE | STORAGE ENGINE | NULL | GPL | | BLACKHOLE | ACTIVE | STORAGE ENGINE | NULL | GPL | | FEDERATED | DISABLED | STORAGE ENGINE | NULL | GPL |
46、通过SQL Server Performance Monitor监视相应硬件的负载 Memory: Page Faults / sec计数器如果该值偶尔走高,表明当时有线程竞争内存。如果持续很高,则内存可能是瓶颈。 Process: 1、% DPC Time 指在范例间隔期间处理器用在缓延程序调用(DPC)接收和提供服务的百分比。(DPC 正在运行的为比标准间隔优先权低的间隔...