xxq250
/
homework-jianmu
1
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Wiki Activity

docs: add db option table_prefix and table_suffix

This commit is contained in:
Xiaoyu Wang 2022-12-27 09:49:31 +08:00
parent 6bec82a427
commit 67a4de52f7
2 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
docs/en/12-taos-sql/02-database.md
View File

@ -30,6 +30,8 @@ database_option: {
| WAL_LEVEL {1 | 2}
| VGROUPS value
| SINGLE_STABLE {0 | 1}
| TABLE_PREFIX value
| TABLE_SUFFIX value
| WAL_RETENTION_PERIOD value
| WAL_ROLL_PERIOD value
| WAL_RETENTION_SIZE value
@ -67,6 +69,8 @@ database_option: {
- SINGLE_STABLE: specifies whether the database can contain more than one supertable.
- 0: The database can contain multiple supertables.
- 1: The database can contain only one supertable.
- TABLE_PREFIX：The prefix length in the table name that is ignored when distributing table to vnode based on table name.
- TABLE_SUFFIX：The suffix length in the table name that is ignored when distributing table to vnode based on table name.
- WAL_RETENTION_PERIOD: specifies the time after which WAL files are deleted. This parameter is used for data subscription. Enter a time in seconds. The default value of single copy is 0. A value of 0 indicates that each WAL file is deleted immediately after its contents are written to disk. -1: WAL files are never deleted. The default value of multiple copy is 4 days.
- WAL_RETENTION_SIZE: specifies the size at which WAL files are deleted. This parameter is used for data subscription. Enter a size in KB. The default value of single copy is 0. A value of 0 indicates that each WAL file is deleted immediately after its contents are written to disk. -1: WAL files are never deleted. The default value of multiple copy is -1.
- WAL_ROLL_PERIOD: specifies the time after which WAL files are rotated. After this period elapses, a new WAL file is created. The default value of single copy is 0. A value of 0 indicates that a new WAL file is created only after the previous WAL file was written to disk. The default values of multiple copy is 1 day.

4
docs/zh/12-taos-sql/02-database.md
View File

@ -30,6 +30,8 @@ database_option: {
| WAL_LEVEL {1 | 2}
| VGROUPS value
| SINGLE_STABLE {0 | 1}
| TABLE_PREFIX value
| TABLE_SUFFIX value
| WAL_RETENTION_PERIOD value
| WAL_ROLL_PERIOD value
| WAL_RETENTION_SIZE value
@ -67,6 +69,8 @@ database_option: {
- SINGLE_STABLE：表示此数据库中是否只可以创建一个超级表，用于超级表列非常多的情况。
- 0：表示可以创建多张超级表。
- 1：表示只可以创建一张超级表。
- TABLE_PREFIX：内部存储引擎根据表名分配存储该表数据的 VNODE 时要忽略的前缀的长度。
- TABLE_SUFFIX：内部存储引擎根据表名分配存储该表数据的 VNODE 时要忽略的后缀的长度。
- WAL_RETENTION_PERIOD：wal 文件的额外保留策略，用于数据订阅。wal 的保存时长，单位为 s。单副本默认为 0，即落盘后立即删除。-1 表示不删除。多副本默认为 4 天。
- WAL_RETENTION_SIZE：wal 文件的额外保留策略，用于数据订阅。wal 的保存的最大上限，单位为 KB。单副本默认为 0，即落盘后立即删除。多副本默认为-1，表示不删除。
- WAL_ROLL_PERIOD：wal 文件切换时长，单位为 s。当 wal 文件创建并写入后，经过该时间，会自动创建一个新的 wal 文件。单副本默认为 0，即仅在落盘时创建新文件。多副本默认为 1 天。