The downside of creating a sequence with a cache is that if a system failure occurs, all cached sequence values that havenotbe used, will be "lost". This results in a "gap" in the assigned sequence values. When
使用cache或许会跳号, 比如数据库突然不正常down掉(shutdown abort),cache中的sequence就会丢失. 所以可以在create sequence的时候用nocache防止这种情况。 2、Alter Sequence 你或者是该sequence的owner,或者有ALTER ANY SEQUENCE 权限才能改动sequence. 可以alter除start至以外的所有sequence参数.如果想要改变start值,必须...
ORDER Specify ORDER to guarantee that sequence numbers are generated in order of request. This clause is useful if you are using the sequence numbers as timestamps. Guaranteeing order is usually not important for sequences used to generate primary keys. ORDER is necessary only to guarantee ordere...
ORDERguarantees that sequence numbers are generatedinorderofrequest.You may want to usethisoptionifyou are using the sequence numbersastimestamps.Guaranteeing order is usually not importantforsequences used to generate primary keys.NOORDERdoes not guarantee sequence numbers are generatedinorderofrequest.I...
tsbkupmap.txt- containing the tablespace names, datafile numbers and the incremental backup pieces incrbackups.txt- containing the actual location of the incremental backup pieces rmanincrNaNd- containing the RMAN scripts used to create the incremental backups. ...
CACHENOCACHE NOCACHECACHENOCACHEORDERto guarantee that sequence numbers are generated in order of request. This clause is useful if you are using the sequence numbers as timestamps. Guaranteeing order is usually not important for sequences used to generate primary keys. ...
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Create an ORACLE sequence for your column with the same grants and synonyms as your combinations table (for insert privileges). Name your sequenceYOUR_TABLE_NAME_S. Define the Who columns, LAST_UPDATE_DATE (type DATE, NOT NULL) and LAST_UPDATED_BY (type NUMBER, length 15, NOT NULL). All...
Incremental values, such as ascending sequence numbers or increasingly later date values, are always added to the right side of the index, which is the home of higher and higher values. In addition, any deletions from the index have a tendency to be skewed toward the left side as older ...
PLSQL APIs Components in this advanced pack are being delivered for some of the key public APIs that are available in 12.1.3 release. The Components are defined at the level of the API - Method - Overload sequence. The API signature for the method is captured in the definition of the ma...