edwards0307
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MANAGE TABLE
- 博客分类：
- oracle
1.heap table
IOT
PARTITION TABLE
HEAP TABLE
CLUSTER
2.create table t(
id number,
varchar2(80),
name char2(10)
)
pctfree 20
pctused 40
storage(
initial 180k
next 180k
pctincrease 10
miniextents 3
maxextents 5
)
tablespace users
...
MONITOR redo size
- 博客分类：
- oracle
1.set autot on stat
2.unsing v$statname,v$mystat
set echo offset verify offcolumn value new_val Vdefine S="&1"
set autotrace offselect a.name, b.value from v$statname a, v$mystat bwhere a.statistic# = b.statistic#and lower(a.name) like '%' || lower('&S')||'%'
DML operation ...
When we COMMIT, all that is left to happen is the following:• An SCN is generated for our transaction. In case you are not familiar with it, the SCN isa simple timing mechanism Oracle uses to guarantee the ordering of transactions andto enable recovery from failure. It is also used to guarantee read- ...
What is the schema ?
- 博客分类：
- oracle
A schema is a collection of database objects owned by a specific database user,or schema objects.Schema has the same name as that user,every user has a single schema,so the two terms(Schema,User) are synonymous.
Schema objects include the segments(tables,indexes..etc) as we can see in the tablespace ...
MANAGE UNDOTABS
- 博客分类：
- oracle
1.manual
undo_management=manual
transactions transactions_per_rollback_segment
rollback_segments =('rbs1','rbs2')
create rollback segment rbs1 tablespace undotbs1; privs seg
create public rollback segment prbs1 tablespace undotbs1 public seg
alter ...
1.select a.name,b.status from v$rollname a,v$rollstat b
where a.name in
(select segment_name from dba_segments where tablespace_name='UNDOTBS1')and a.usn=b.usn;
2. select s.username,t.xidusn,t.ubafil,t.ubablk,t.used_ublk from v$session s,v$transaction t where s.saddr=t.ses_addr;
3.se ...
1.SEGMENT:
allocated for a specific data structure
Oracle allocates space for segments in units of one extent.
A segment and all its extents are stored in one tablespace
segment can span datafiles
table,index,temporary,undo
2.EXTENTS:
An extent is a s ...
1. tablespace,segment,extent,block
tablespace: database logical is divided into more tablesapces.
segment: a special storage structure(table,index),span more datafiles
extents:allocate unit
block: use unit,write/read unit
db_block_size, default block size. standan ...
ORACLE NET
- 博客分类：
- oracle
1.net_service_name:
servive_name: The SERVICE_NAME is the global database name .=sid+domain
net_service_name= (DESCRIPTION= (ADDRESS=(PROTOCOL=tcp)(HOST=host)(PORT=port) ) (CONNECT_DATA= (SERVICE_NAME=service_name) ) )
2. locate port: oracle_home/install/portlist.int
3. jdbc ...
SQLPLUS TIPS
- 博客分类：
- oracle
1.SQLPLUS : a tool that execute sql ,sqlplus ,sqlplus command.
1.sqlplus command-line cmd-sqlplus /nolog
2.sqlplus GUI sqlplusw /nolog
3.sqlplus web http://127.0.0.1:5560/isqlplus/
ht ...
ORACLE_HOME
ORACLE_SID : oracle instance
PATH:
LD_LIBRARY_PATH:dynamic lib
TNS_ADMIN : the location of tnsname.ora
SQLPATH: the location of SQL scripts;
Exam Test1
- 博客分类：
- oracle
1.utl_file_dir: indicate the directory which the pl/sql packages and procedure can access and use
2.V$SHARED_POOL_RESERVED :lists statistics that help you tune the reserved pool and space within the shared pool.
SHARED_POOL_RESERVED_SIZE: specifies (in bytes) the shared pool space that is ...
1. objective:
copy online redologs to offline desitination
database recovery
update standby database
2.change redolog mode(archive log mode)
in oracle 10g startup mount
alter database archivelog/noarchivelog
in oracle 9 ...
RESUMABLE SESSION
- 博客分类：
- oracle
RESUMABLE SESSION
Let you enable and disable resumable space allocation. This feature allows an operation to be suspended in the event of an out-of-space error condition and to resume automatically from the point of interruption when the error condition is fixed.Using RESUMABLE Session to Avoid Tra ...
Managing the Redo Log
- 博客分类：
- oracle
1.What Is the Redo Log?
store all changes made to the database as they occur. Redo log files are filled with redo records. A redo record, also called a redo entry, is made up of a group of change vectors, describe changes to the data segment block for the table, the undo segment data block, and t ...