DECLAREv_count NUMBER;BEGINSELECTCOUNT(*)INTOv_countFROMemployees;DBMS_OUTPUT.PUT_LINE('Number of rows in employees table: '||v_count);END; 在这个例子中,我们首先声明了一个名为v_count的变量,然后使用SELECT COUNT(*)语句将表中的行数存储到该变量中。
prse = select value from v$sysstat where name = 'parse count (total)'; exe = select value from v$sysstat where name = 'execute count'; 没绑定的话导致不能重用也是一个原因,当然sharedpool太小也有可能,单纯的加session_cached_cursors也不是根治的办法,不同的sql还是不能重用,还要解析。即使是soft ...
EOF )# for all tablesIFS=$'\n'fortable_namein${table_names}dorow_count=$(get_table_row_count${table_name})echo"Table${table_name}:${row_count} rows"done# print sysdate and SCNecho"Current Date:${current_date}"echo"Current SCN:${current_scn}"...
1. COUNT(*)比COUNT(列)更慢!项目组必须用COUNT(列),不准用COUNT(*); 2. COUNT(*)用不到索引,COUNT(列)才能用到; 3. COUNT是统计出全表的记录,是吞吐量的操作,肯定用不到索引; COUNT(*)和COUNT(列)哪个更快 这里测试一下: 连接数据库: 创建测试表: drop table t purge; create table t as se...
1createorreplacefunctioncount_rows(table_nameinvarchar2,2ownerinvarchar2defaultnull)3returnnumber4authidcurrent_user5IS6num_rowsnumber;7stmtvarchar2(2000);8begin9ifownerisnullthen10stmt :='select count(*) from "'||table_name||'"';11else12stmt :='select count(*) from "'||owner||'"."'...
Oracle Pivot Table functionality helps rearrange rows and columns of data to a simplified table for the user to better understand data relations and dependencies. This page provides a brief overview of the pivot table feature in dbForge Studio for Oracle and describes the process of creating pivot...
1、先查询本库的所有表，测试sql，select * from user_tables t where table_name like 'TEST%';可以看到有多张表；2、查询一共有几张数据表，select count(*) from user_tables t where table_name like 'TEST%';3、编写脚本，查询TEST开头表，每个表的记录数，declare v_sql varchar2(200)...
之后,再查select table_name, count_rows(table_name) nrows from user_tables ,OKOracle查询数据库中所有表的记录数的更多相关文章Oracle查询数据库中所有表和分区表的记录数 --查询SCOTT用户中所有表的记录数declare v_count number; query varchar2(4000);begin for i in (select table_name fr ... 统计...
select TABLE_NAME,NUM_ROWS from dba_tables where OWNER='xxx' order by NUM_ROWS desc; 1. 整理好后交给开发,确认各大表是否可清理,需保存多久数据。 二、 清理分类 目前大致遇到以下几种场景: 1. 可以drop 备份表、临时表、已无用的表 时间范围分区表:索引改为local索引后,按分区drop ...
* Number of data blocks allocated to the table that have never been used (EMPTY_BLOCKS) Average available free space in each data block in bytes (AVG_SPACE) Number of chained rows (CHAIN_COUNT) Average row length, including the row's overhead, in bytes (AVG_ROW_LEN) ...